* perf: fuzzer KASAN unwind_get_return_address @ 2016-11-15 17:43 Vince Weaver 2016-11-15 18:57 ` Peter Zijlstra 0 siblings, 1 reply; 33+ messages in thread From: Vince Weaver @ 2016-11-15 17:43 UTC (permalink / raw) To: linux-kernel Cc: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian Running on my haswell machine with the imc/uncore patch applied, the perf_fuzzer next tripped over this issue. [ 202.034495] BAD LUCK: lost 371 message(s) from NMI context! [ 202.034496] ================================================================== [ 202.048327] BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x35/0x80 at addr ffff8800cff0bd90 [ 202.058826] Read of size 8 by task perf_fuzzer/16254 [ 202.064186] page:ffffea00033fc2c0 count:1 mapcount:0 mapping: (null) index:0x0^Ac [ 202.073068] flags: 0x1ffff8000000400(reserved) [ 202.077885] page dumped because: kasan: bad access detected [ 202.083880] CPU: 4 PID: 16254 Comm: perf_fuzzer Not tainted 4.9.0-rc5+ #5 [ 202.091204] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 [ 202.099181] ffff8800cff0b1d8^Ac ffffffff816bb796^Ac ffff8800cff0b270^Ac ffff8800cff0bd90^Ac [ 202.107896] ffff8800cff0b260^Ac ffffffff812fbe95^Ac 00007ffc9d1ab480^Ac 0000000000000000^Ac [ 202.116638] ffffffff8125117d^Ac 0000000000000092^Ac 0000000000000000^Ac ffff8800cff0b7c0^Ac [ 202.125339] Call Trace: [ 202.127994] <NMI> [<ffffffff816bb796>] dump_stack+0x63/0x8d [ 202.134184] [<ffffffff812fbe95>] kasan_report_error+0x495/0x4c0 [ 202.140680] [<ffffffff8125117d>] ? perf_output_begin+0x28d/0x4c0 [ 202.147228] [<ffffffff812fc319>] kasan_report+0x39/0x40 [ 202.152987] [<ffffffff81095ce5>] ? unwind_get_return_address+0x35/0x80 [ 202.160094] [<ffffffff812fa8fe>] __asan_load8+0x5e/0x70 [ 202.165859] [<ffffffff81095ce5>] unwind_get_return_address+0x35/0x80 [ 202.172817] [<ffffffff8100b08d>] perf_callchain_kernel+0x22d/0x270 [ 202.179590] [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80 [ 202.185548] [<ffffffff8100ae60>] ? arch_perf_update_userpage+0x130/0x130 [ 202.192849] [<ffffffff81252aaa>] get_perf_callchain+0x24a/0x3e0 [ 202.199339] [<ffffffff81252860>] ? put_callchain_buffers+0x50/0x50 [ 202.206092] [<ffffffff81095b17>] ? perf_get_regs_user+0x327/0x380 [ 202.212751] [<ffffffff81135fd0>] ? lock_release+0x30/0x540 [ 202.218803] [<ffffffff81252d05>] perf_callchain+0xc5/0xe0 [ 202.224767] [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80 [ 202.230696] [<ffffffff8124dbf9>] perf_prepare_sample+0x489/0x630 [ 202.237275] [<ffffffff81135fd0>] ? lock_release+0x30/0x540 [ 202.243266] [<ffffffff8124de9c>] ? perf_event_output_forward+0xfc/0x130 [ 202.250472] [<ffffffff8124dda0>] ? perf_prepare_sample+0x630/0x630 [ 202.257251] [<ffffffff8124e0ae>] perf_event_output+0xae/0x130 [ 202.263564] [<ffffffff8124e000>] ? perf_event_output_backward+0x130/0x130 [ 202.270964] [<ffffffff8124e000>] ? perf_event_output_backward+0x130/0x130 [ 202.278373] [<ffffffff81247cc2>] ? perf_event_update_userpage+0x212/0x2b0 [ 202.285772] [<ffffffff81247ab0>] ? perf_event_task_disable+0xc0/0xc0 [ 202.292744] [<ffffffff812fac4f>] ? __asan_loadN+0xf/0x20 [ 202.298581] [<ffffffff8101757d>] ? setup_pebs_sample_data+0x68d/0x830 [ 202.305622] [<ffffffff81017a91>] __intel_pmu_pebs_event+0x221/0x3a0 [ 202.312469] [<ffffffff81135e4d>] ? lock_acquire+0x3d/0x190 [ 202.318523] [<ffffffff81017870>] ? pebs_update_state+0x150/0x150 [ 202.325060] [<ffffffff8104c6ec>] ? get_stack_info+0x3c/0x150 [ 202.331259] [<ffffffff810106b7>] ? __intel_pmu_enable_all+0x77/0xf0 [ 202.338128] [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80 [ 202.344059] [<ffffffff81018b50>] ? intel_pmu_disable_bts+0x60/0x60 [ 202.350823] [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80 [ 202.356740] [<ffffffff81252d05>] ? perf_callchain+0xc5/0xe0 [ 202.362855] [<ffffffff81135fd0>] ? lock_release+0x30/0x540 [ 202.368855] [<ffffffff8124dc31>] ? perf_prepare_sample+0x4c1/0x630 [ 202.375619] [<ffffffff8124de84>] ? perf_event_output_forward+0xe4/0x130 [ 202.382849] [<ffffffff81017ffc>] intel_pmu_drain_pebs_nhm+0x3ec/0x530 [ 202.389899] [<ffffffff81017c10>] ? __intel_pmu_pebs_event+0x3a0/0x3a0 [ 202.396959] [<ffffffff81247caa>] ? perf_event_update_userpage+0x1fa/0x2b0 [ 202.406800] [<ffffffff81247cc2>] ? perf_event_update_userpage+0x212/0x2b0 [ 202.416486] [<ffffffff81247ab0>] ? perf_event_task_disable+0xc0/0xc0 [ 202.425720] [<ffffffff8101a832>] ? intel_pmu_lbr_read+0x32/0x790 [ 202.434566] [<ffffffff8123ba26>] ? __perf_event_overflow+0x116/0x280 [ 202.443735] [<ffffffff810144d8>] ? intel_bts_interrupt+0x88/0x1b0 [ 202.452538] [<ffffffff81012c7e>] intel_pmu_handle_irq+0x3ae/0x690 [ 202.461407] [<ffffffff810128d0>] ? intel_pmu_save_and_restart+0x80/0x80 [ 202.470877] [<ffffffff81135fd0>] ? lock_release+0x30/0x540 [ 202.479131] [<ffffffff81088eeb>] ? native_apic_msr_write+0x2b/0x30 [ 202.488181] [<ffffffff8108899c>] ? x2apic_send_IPI_self+0x3c/0x50 [ 202.497066] [<ffffffff81055d72>] ? native_sched_clock+0x62/0x140 [ 202.505919] [<ffffffff810081fd>] perf_event_nmi_handler+0x2d/0x50 [ 202.514832] [<ffffffff8104da91>] nmi_handle+0xb1/0x1d0 [ 202.522697] [<ffffffff8104d9e5>] ? nmi_handle+0x5/0x1d0 [ 202.530610] [<ffffffff8104e185>] default_do_nmi+0xe5/0x140 [ 202.538765] [<ffffffff8104e332>] do_nmi+0x152/0x1b0 [ 202.546254] [<ffffffff81b8f171>] end_repeat_nmi+0x1a/0x1e [ 202.554257] [<ffffffff810106b7>] ? __intel_pmu_enable_all+0x77/0xf0 [ 202.563167] [<ffffffff812475eb>] ? perf_event_task_tick+0x48b/0x5f0 [ 202.572060] [<ffffffff812475eb>] ? perf_event_task_tick+0x48b/0x5f0 [ 202.580864] [<ffffffff812475eb>] ? perf_event_task_tick+0x48b/0x5f0 [ 202.589703] <EOE> <IRQ> [<ffffffff81101571>] scheduler_tick+0xb1/0x150 [ 202.598985] [<ffffffff8116e7e7>] update_process_times+0x47/0x60 [ 202.607433] [<ffffffff81185e53>] tick_sched_handle.isra.14+0x33/0x80 [ 202.616314] [<ffffffff811869cb>] tick_sched_timer+0x4b/0x90 [ 202.624322] [<ffffffff8116fbfe>] __hrtimer_run_queues+0x21e/0x540 [ 202.632864] [<ffffffff81186980>] ? tick_sched_do_timer+0x50/0x50 [ 202.641337] [<ffffffff8116f9e0>] ? retrigger_next_event+0xa0/0xa0 [ 202.649947] [<ffffffff8117b8f6>] ? ktime_get_update_offsets_now+0xe6/0x190 [ 202.659411] [<ffffffff811707f0>] ? hrtimer_interrupt+0xb0/0x220 [ 202.667864] [<ffffffff8117082f>] hrtimer_interrupt+0xef/0x220 [ 202.676069] [<ffffffff8123b020>] ? perf_cgroup_attach+0xb0/0xb0 [ 202.684444] [<ffffffff8107ec2f>] local_apic_timer_interrupt+0x4f/0x80 [ 202.693422] [<ffffffff81b903d7>] smp_apic_timer_interrupt+0x57/0x70 [ 202.702203] [<ffffffff81b8f6a2>] apic_timer_interrupt+0x82/0x90 [ 202.710591] <EOI> [<ffffffff8123b020>] ? perf_cgroup_attach+0xb0/0xb0 [ 202.719609] [<ffffffff8118dc3a>] ? smp_call_function_single+0x14a/0x1b0 [ 202.728811] [<ffffffff8118dc30>] ? smp_call_function_single+0x140/0x1b0 [ 202.738039] [<ffffffff8118daf0>] ? generic_exec_single+0x170/0x170 [ 202.746727] [<ffffffff8123b020>] ? perf_cgroup_attach+0xb0/0xb0 [ 202.755181] [<ffffffff81238e48>] event_function_call+0x268/0x270 [ 202.763687] [<ffffffff812426d0>] ? task_ctx_sched_out+0x60/0x60 [ 202.772057] [<ffffffff81238be0>] ? task_function_call+0xc0/0xc0 [ 202.780404] [<ffffffff812426d0>] ? task_ctx_sched_out+0x60/0x60 [ 202.788768] [<ffffffff81238e79>] ? _perf_event_disable+0x29/0x70 [ 202.797258] [<ffffffff812383d0>] ? update_group_times+0x50/0x50 [ 202.805667] [<ffffffff81238e97>] ? _perf_event_disable+0x47/0x70 [ 202.814188] [<ffffffff8113a4d7>] ? do_raw_spin_unlock+0x97/0x130 [ 202.822733] [<ffffffff81238e50>] ? event_function_call+0x270/0x270 [ 202.831462] [<ffffffff81238ea8>] _perf_event_disable+0x58/0x70 [ 202.839778] [<ffffffff812386a3>] perf_event_for_each_child+0x53/0xd0 [ 202.848576] [<ffffffff81247a51>] perf_event_task_disable+0x61/0xc0 [ 202.857303] [<ffffffff810daee2>] SyS_prctl+0x3f2/0x690 [ 202.864853] [<ffffffff810daaf0>] ? SyS_umask+0x40/0x40 [ 202.872375] [<ffffffff81136c6a>] ? lockdep_sys_exit+0x1a/0xa0 [ 202.880517] [<ffffffff81004016>] ? lockdep_sys_exit_thunk+0x16/0x30 [ 202.889310] [<ffffffff81b8dabb>] entry_SYSCALL_64_fastpath+0x1e/0xb2 [ 202.898177] Memory state around the buggy address: [ 202.905288] ffff8800cff0bc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 202.915044] ffff8800cff0bd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 202.924697] >ffff8800cff0bd80: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 [ 202.934420] ^ [ 202.940352] ffff8800cff0be00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 202.950141] ffff8800cff0be80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 202.959835] ================================================================== ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-15 17:43 perf: fuzzer KASAN unwind_get_return_address Vince Weaver @ 2016-11-15 18:57 ` Peter Zijlstra 2016-11-15 19:04 ` Dmitry Vyukov 2016-11-15 19:05 ` Vince Weaver 0 siblings, 2 replies; 33+ messages in thread From: Peter Zijlstra @ 2016-11-15 18:57 UTC (permalink / raw) To: Vince Weaver Cc: linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian, jpoimboe On Tue, Nov 15, 2016 at 12:43:56PM -0500, Vince Weaver wrote: > > Running on my haswell machine with the imc/uncore patch applied, the > perf_fuzzer next tripped over this issue. > > [ 202.034495] BAD LUCK: lost 371 message(s) from NMI context! > [ 202.034496] ================================================================== > [ 202.048327] BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x35/0x80 at addr ffff8800cff0bd90 > [ 202.058826] Read of size 8 by task perf_fuzzer/16254 > [ 202.064186] page:ffffea00033fc2c0 count:1 mapcount:0 mapping: (null) index:0x0^Ac > [ 202.073068] flags: 0x1ffff8000000400(reserved) > [ 202.077885] page dumped because: kasan: bad access detected > [ 202.083880] CPU: 4 PID: 16254 Comm: perf_fuzzer Not tainted 4.9.0-rc5+ #5 > [ 202.091204] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 > [ 202.099181] ffff8800cff0b1d8^Ac ffffffff816bb796^Ac ffff8800cff0b270^Ac ffff8800cff0bd90^Ac > [ 202.107896] ffff8800cff0b260^Ac ffffffff812fbe95^Ac 00007ffc9d1ab480^Ac 0000000000000000^Ac > [ 202.116638] ffffffff8125117d^Ac 0000000000000092^Ac 0000000000000000^Ac ffff8800cff0b7c0^Ac > [ 202.125339] Call Trace: > [ 202.127994] <NMI> [<ffffffff816bb796>] dump_stack+0x63/0x8d > [ 202.134184] [<ffffffff812fbe95>] kasan_report_error+0x495/0x4c0 > [ 202.140680] [<ffffffff8125117d>] ? perf_output_begin+0x28d/0x4c0 > [ 202.147228] [<ffffffff812fc319>] kasan_report+0x39/0x40 > [ 202.152987] [<ffffffff81095ce5>] ? unwind_get_return_address+0x35/0x80 > [ 202.160094] [<ffffffff812fa8fe>] __asan_load8+0x5e/0x70 > [ 202.165859] [<ffffffff81095ce5>] unwind_get_return_address+0x35/0x80 Josh, any ideas? > [ 202.172817] [<ffffffff8100b08d>] perf_callchain_kernel+0x22d/0x270 > [ 202.179590] [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80 > [ 202.185548] [<ffffffff8100ae60>] ? arch_perf_update_userpage+0x130/0x130 > [ 202.192849] [<ffffffff81252aaa>] get_perf_callchain+0x24a/0x3e0 > [ 202.199339] [<ffffffff81252860>] ? put_callchain_buffers+0x50/0x50 > [ 202.206092] [<ffffffff81095b17>] ? perf_get_regs_user+0x327/0x380 > [ 202.212751] [<ffffffff81135fd0>] ? lock_release+0x30/0x540 > [ 202.218803] [<ffffffff81252d05>] perf_callchain+0xc5/0xe0 > [ 202.224767] [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80 > [ 202.230696] [<ffffffff8124dbf9>] perf_prepare_sample+0x489/0x630 > [ 202.237275] [<ffffffff81135fd0>] ? lock_release+0x30/0x540 > [ 202.243266] [<ffffffff8124de9c>] ? perf_event_output_forward+0xfc/0x130 > [ 202.250472] [<ffffffff8124dda0>] ? perf_prepare_sample+0x630/0x630 > [ 202.257251] [<ffffffff8124e0ae>] perf_event_output+0xae/0x130 > [ 202.263564] [<ffffffff8124e000>] ? perf_event_output_backward+0x130/0x130 > [ 202.270964] [<ffffffff8124e000>] ? perf_event_output_backward+0x130/0x130 > [ 202.278373] [<ffffffff81247cc2>] ? perf_event_update_userpage+0x212/0x2b0 > [ 202.285772] [<ffffffff81247ab0>] ? perf_event_task_disable+0xc0/0xc0 > [ 202.292744] [<ffffffff812fac4f>] ? __asan_loadN+0xf/0x20 > [ 202.298581] [<ffffffff8101757d>] ? setup_pebs_sample_data+0x68d/0x830 > [ 202.305622] [<ffffffff81017a91>] __intel_pmu_pebs_event+0x221/0x3a0 > [ 202.312469] [<ffffffff81135e4d>] ? lock_acquire+0x3d/0x190 > [ 202.318523] [<ffffffff81017870>] ? pebs_update_state+0x150/0x150 > [ 202.325060] [<ffffffff8104c6ec>] ? get_stack_info+0x3c/0x150 > [ 202.331259] [<ffffffff810106b7>] ? __intel_pmu_enable_all+0x77/0xf0 > [ 202.338128] [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80 > [ 202.344059] [<ffffffff81018b50>] ? intel_pmu_disable_bts+0x60/0x60 > [ 202.350823] [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80 > [ 202.356740] [<ffffffff81252d05>] ? perf_callchain+0xc5/0xe0 > [ 202.362855] [<ffffffff81135fd0>] ? lock_release+0x30/0x540 > [ 202.368855] [<ffffffff8124dc31>] ? perf_prepare_sample+0x4c1/0x630 > [ 202.375619] [<ffffffff8124de84>] ? perf_event_output_forward+0xe4/0x130 > [ 202.382849] [<ffffffff81017ffc>] intel_pmu_drain_pebs_nhm+0x3ec/0x530 > [ 202.389899] [<ffffffff81017c10>] ? __intel_pmu_pebs_event+0x3a0/0x3a0 > [ 202.396959] [<ffffffff81247caa>] ? perf_event_update_userpage+0x1fa/0x2b0 > [ 202.406800] [<ffffffff81247cc2>] ? perf_event_update_userpage+0x212/0x2b0 > [ 202.416486] [<ffffffff81247ab0>] ? perf_event_task_disable+0xc0/0xc0 > [ 202.425720] [<ffffffff8101a832>] ? intel_pmu_lbr_read+0x32/0x790 > [ 202.434566] [<ffffffff8123ba26>] ? __perf_event_overflow+0x116/0x280 > [ 202.443735] [<ffffffff810144d8>] ? intel_bts_interrupt+0x88/0x1b0 > [ 202.452538] [<ffffffff81012c7e>] intel_pmu_handle_irq+0x3ae/0x690 > [ 202.461407] [<ffffffff810128d0>] ? intel_pmu_save_and_restart+0x80/0x80 > [ 202.470877] [<ffffffff81135fd0>] ? lock_release+0x30/0x540 > [ 202.479131] [<ffffffff81088eeb>] ? native_apic_msr_write+0x2b/0x30 > [ 202.488181] [<ffffffff8108899c>] ? x2apic_send_IPI_self+0x3c/0x50 > [ 202.497066] [<ffffffff81055d72>] ? native_sched_clock+0x62/0x140 > [ 202.505919] [<ffffffff810081fd>] perf_event_nmi_handler+0x2d/0x50 > [ 202.514832] [<ffffffff8104da91>] nmi_handle+0xb1/0x1d0 > [ 202.522697] [<ffffffff8104d9e5>] ? nmi_handle+0x5/0x1d0 > [ 202.530610] [<ffffffff8104e185>] default_do_nmi+0xe5/0x140 > [ 202.538765] [<ffffffff8104e332>] do_nmi+0x152/0x1b0 > [ 202.546254] [<ffffffff81b8f171>] end_repeat_nmi+0x1a/0x1e > [ 202.554257] [<ffffffff810106b7>] ? __intel_pmu_enable_all+0x77/0xf0 > [ 202.563167] [<ffffffff812475eb>] ? perf_event_task_tick+0x48b/0x5f0 > [ 202.572060] [<ffffffff812475eb>] ? perf_event_task_tick+0x48b/0x5f0 > [ 202.580864] [<ffffffff812475eb>] ? perf_event_task_tick+0x48b/0x5f0 > [ 202.589703] <EOE> <IRQ> [<ffffffff81101571>] scheduler_tick+0xb1/0x150 > [ 202.598985] [<ffffffff8116e7e7>] update_process_times+0x47/0x60 > [ 202.607433] [<ffffffff81185e53>] tick_sched_handle.isra.14+0x33/0x80 > [ 202.616314] [<ffffffff811869cb>] tick_sched_timer+0x4b/0x90 > [ 202.624322] [<ffffffff8116fbfe>] __hrtimer_run_queues+0x21e/0x540 > [ 202.632864] [<ffffffff81186980>] ? tick_sched_do_timer+0x50/0x50 > [ 202.641337] [<ffffffff8116f9e0>] ? retrigger_next_event+0xa0/0xa0 > [ 202.649947] [<ffffffff8117b8f6>] ? ktime_get_update_offsets_now+0xe6/0x190 > [ 202.659411] [<ffffffff811707f0>] ? hrtimer_interrupt+0xb0/0x220 > [ 202.667864] [<ffffffff8117082f>] hrtimer_interrupt+0xef/0x220 > [ 202.676069] [<ffffffff8123b020>] ? perf_cgroup_attach+0xb0/0xb0 > [ 202.684444] [<ffffffff8107ec2f>] local_apic_timer_interrupt+0x4f/0x80 > [ 202.693422] [<ffffffff81b903d7>] smp_apic_timer_interrupt+0x57/0x70 > [ 202.702203] [<ffffffff81b8f6a2>] apic_timer_interrupt+0x82/0x90 > [ 202.710591] <EOI> [<ffffffff8123b020>] ? perf_cgroup_attach+0xb0/0xb0 > [ 202.719609] [<ffffffff8118dc3a>] ? smp_call_function_single+0x14a/0x1b0 > [ 202.728811] [<ffffffff8118dc30>] ? smp_call_function_single+0x140/0x1b0 > [ 202.738039] [<ffffffff8118daf0>] ? generic_exec_single+0x170/0x170 > [ 202.746727] [<ffffffff8123b020>] ? perf_cgroup_attach+0xb0/0xb0 > [ 202.755181] [<ffffffff81238e48>] event_function_call+0x268/0x270 > [ 202.763687] [<ffffffff812426d0>] ? task_ctx_sched_out+0x60/0x60 > [ 202.772057] [<ffffffff81238be0>] ? task_function_call+0xc0/0xc0 > [ 202.780404] [<ffffffff812426d0>] ? task_ctx_sched_out+0x60/0x60 > [ 202.788768] [<ffffffff81238e79>] ? _perf_event_disable+0x29/0x70 > [ 202.797258] [<ffffffff812383d0>] ? update_group_times+0x50/0x50 > [ 202.805667] [<ffffffff81238e97>] ? _perf_event_disable+0x47/0x70 > [ 202.814188] [<ffffffff8113a4d7>] ? do_raw_spin_unlock+0x97/0x130 > [ 202.822733] [<ffffffff81238e50>] ? event_function_call+0x270/0x270 > [ 202.831462] [<ffffffff81238ea8>] _perf_event_disable+0x58/0x70 > [ 202.839778] [<ffffffff812386a3>] perf_event_for_each_child+0x53/0xd0 > [ 202.848576] [<ffffffff81247a51>] perf_event_task_disable+0x61/0xc0 > [ 202.857303] [<ffffffff810daee2>] SyS_prctl+0x3f2/0x690 > [ 202.864853] [<ffffffff810daaf0>] ? SyS_umask+0x40/0x40 > [ 202.872375] [<ffffffff81136c6a>] ? lockdep_sys_exit+0x1a/0xa0 > [ 202.880517] [<ffffffff81004016>] ? lockdep_sys_exit_thunk+0x16/0x30 > [ 202.889310] [<ffffffff81b8dabb>] entry_SYSCALL_64_fastpath+0x1e/0xb2 > [ 202.898177] Memory state around the buggy address: > [ 202.905288] ffff8800cff0bc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 202.915044] ffff8800cff0bd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 202.924697] >ffff8800cff0bd80: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 > [ 202.934420] ^ > [ 202.940352] ffff8800cff0be00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 202.950141] ffff8800cff0be80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 202.959835] ================================================================== > ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-15 18:57 ` Peter Zijlstra @ 2016-11-15 19:04 ` Dmitry Vyukov 2016-11-15 20:56 ` Josh Poimboeuf 2016-11-15 19:05 ` Vince Weaver 1 sibling, 1 reply; 33+ messages in thread From: Dmitry Vyukov @ 2016-11-15 19:04 UTC (permalink / raw) To: Peter Zijlstra Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, Stephane Eranian, jpoimboe On Tue, Nov 15, 2016 at 10:57 AM, Peter Zijlstra <peterz@infradead.org> wrote: > On Tue, Nov 15, 2016 at 12:43:56PM -0500, Vince Weaver wrote: >> >> Running on my haswell machine with the imc/uncore patch applied, the >> perf_fuzzer next tripped over this issue. >> >> [ 202.034495] BAD LUCK: lost 371 message(s) from NMI context! >> [ 202.034496] ================================================================== >> [ 202.048327] BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x35/0x80 at addr ffff8800cff0bd90 >> [ 202.058826] Read of size 8 by task perf_fuzzer/16254 >> [ 202.064186] page:ffffea00033fc2c0 count:1 mapcount:0 mapping: (null) index:0x0^Ac >> [ 202.073068] flags: 0x1ffff8000000400(reserved) >> [ 202.077885] page dumped because: kasan: bad access detected >> [ 202.083880] CPU: 4 PID: 16254 Comm: perf_fuzzer Not tainted 4.9.0-rc5+ #5 >> [ 202.091204] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 >> [ 202.099181] ffff8800cff0b1d8^Ac ffffffff816bb796^Ac ffff8800cff0b270^Ac ffff8800cff0bd90^Ac >> [ 202.107896] ffff8800cff0b260^Ac ffffffff812fbe95^Ac 00007ffc9d1ab480^Ac 0000000000000000^Ac >> [ 202.116638] ffffffff8125117d^Ac 0000000000000092^Ac 0000000000000000^Ac ffff8800cff0b7c0^Ac >> [ 202.125339] Call Trace: >> [ 202.127994] <NMI> [<ffffffff816bb796>] dump_stack+0x63/0x8d >> [ 202.134184] [<ffffffff812fbe95>] kasan_report_error+0x495/0x4c0 >> [ 202.140680] [<ffffffff8125117d>] ? perf_output_begin+0x28d/0x4c0 >> [ 202.147228] [<ffffffff812fc319>] kasan_report+0x39/0x40 >> [ 202.152987] [<ffffffff81095ce5>] ? unwind_get_return_address+0x35/0x80 >> [ 202.160094] [<ffffffff812fa8fe>] __asan_load8+0x5e/0x70 >> [ 202.165859] [<ffffffff81095ce5>] unwind_get_return_address+0x35/0x80 > > Josh, any ideas? I think this is a false positive due to imprecise unwind that hits a stack redzone. We probably need to use READ_ONCE_NOCHECK as in get_wchan. ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-15 19:04 ` Dmitry Vyukov @ 2016-11-15 20:56 ` Josh Poimboeuf 0 siblings, 0 replies; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-15 20:56 UTC (permalink / raw) To: Dmitry Vyukov Cc: Peter Zijlstra, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, Stephane Eranian On Tue, Nov 15, 2016 at 11:04:45AM -0800, Dmitry Vyukov wrote: > On Tue, Nov 15, 2016 at 10:57 AM, Peter Zijlstra <peterz@infradead.org> wrote: > > On Tue, Nov 15, 2016 at 12:43:56PM -0500, Vince Weaver wrote: > >> > >> Running on my haswell machine with the imc/uncore patch applied, the > >> perf_fuzzer next tripped over this issue. > >> > >> [ 202.034495] BAD LUCK: lost 371 message(s) from NMI context! > >> [ 202.034496] ================================================================== > >> [ 202.048327] BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x35/0x80 at addr ffff8800cff0bd90 > >> [ 202.058826] Read of size 8 by task perf_fuzzer/16254 > >> [ 202.064186] page:ffffea00033fc2c0 count:1 mapcount:0 mapping: (null) index:0x0^Ac > >> [ 202.073068] flags: 0x1ffff8000000400(reserved) > >> [ 202.077885] page dumped because: kasan: bad access detected > >> [ 202.083880] CPU: 4 PID: 16254 Comm: perf_fuzzer Not tainted 4.9.0-rc5+ #5 > >> [ 202.091204] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 > >> [ 202.099181] ffff8800cff0b1d8^Ac ffffffff816bb796^Ac ffff8800cff0b270^Ac ffff8800cff0bd90^Ac > >> [ 202.107896] ffff8800cff0b260^Ac ffffffff812fbe95^Ac 00007ffc9d1ab480^Ac 0000000000000000^Ac > >> [ 202.116638] ffffffff8125117d^Ac 0000000000000092^Ac 0000000000000000^Ac ffff8800cff0b7c0^Ac > >> [ 202.125339] Call Trace: > >> [ 202.127994] <NMI> [<ffffffff816bb796>] dump_stack+0x63/0x8d > >> [ 202.134184] [<ffffffff812fbe95>] kasan_report_error+0x495/0x4c0 > >> [ 202.140680] [<ffffffff8125117d>] ? perf_output_begin+0x28d/0x4c0 > >> [ 202.147228] [<ffffffff812fc319>] kasan_report+0x39/0x40 > >> [ 202.152987] [<ffffffff81095ce5>] ? unwind_get_return_address+0x35/0x80 > >> [ 202.160094] [<ffffffff812fa8fe>] __asan_load8+0x5e/0x70 > >> [ 202.165859] [<ffffffff81095ce5>] unwind_get_return_address+0x35/0x80 > > > > Josh, any ideas? > > I think this is a false positive due to imprecise unwind that hits a > stack redzone. > We probably need to use READ_ONCE_NOCHECK as in get_wchan. I'm not so sure about that. The unwind should be precise here: it should only be looking at the frame pointers and return addresses on the current task's stack. I can't see any reason why it would be reading into the KASAN stack redzone. -- Josh ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-15 18:57 ` Peter Zijlstra 2016-11-15 19:04 ` Dmitry Vyukov @ 2016-11-15 19:05 ` Vince Weaver 2016-11-15 20:57 ` Josh Poimboeuf 1 sibling, 1 reply; 33+ messages in thread From: Vince Weaver @ 2016-11-15 19:05 UTC (permalink / raw) To: Peter Zijlstra Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian, jpoimboe On Tue, 15 Nov 2016, Peter Zijlstra wrote: > On Tue, Nov 15, 2016 at 12:43:56PM -0500, Vince Weaver wrote: > > > > Running on my haswell machine with the imc/uncore patch applied, the > > perf_fuzzer next tripped over this issue. > > > > [ 202.034495] BAD LUCK: lost 371 message(s) from NMI context! > > [ 202.034496] ================================================================== > > [ 202.048327] BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x35/0x80 at addr ffff8800cff0bd90 > > [ 202.058826] Read of size 8 by task perf_fuzzer/16254 > > [ 202.064186] page:ffffea00033fc2c0 count:1 mapcount:0 mapping: (null) index:0x0^Ac > > [ 202.073068] flags: 0x1ffff8000000400(reserved) > > [ 202.077885] page dumped because: kasan: bad access detected > > [ 202.083880] CPU: 4 PID: 16254 Comm: perf_fuzzer Not tainted 4.9.0-rc5+ #5 > > [ 202.091204] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 > > [ 202.099181] ffff8800cff0b1d8^Ac ffffffff816bb796^Ac ffff8800cff0b270^Ac ffff8800cff0bd90^Ac > > [ 202.107896] ffff8800cff0b260^Ac ffffffff812fbe95^Ac 00007ffc9d1ab480^Ac 0000000000000000^Ac > > [ 202.116638] ffffffff8125117d^Ac 0000000000000092^Ac 0000000000000000^Ac ffff8800cff0b7c0^Ac > > [ 202.125339] Call Trace: > > [ 202.127994] <NMI> [<ffffffff816bb796>] dump_stack+0x63/0x8d > > [ 202.134184] [<ffffffff812fbe95>] kasan_report_error+0x495/0x4c0 > > [ 202.140680] [<ffffffff8125117d>] ? perf_output_begin+0x28d/0x4c0 > > [ 202.147228] [<ffffffff812fc319>] kasan_report+0x39/0x40 > > [ 202.152987] [<ffffffff81095ce5>] ? unwind_get_return_address+0x35/0x80 > > [ 202.160094] [<ffffffff812fa8fe>] __asan_load8+0x5e/0x70 > > [ 202.165859] [<ffffffff81095ce5>] unwind_get_return_address+0x35/0x80 > > Josh, any ideas? >From what I can tell this maps to: unsigned long unwind_get_return_address(struct unwind_state *state) { unsigned long addr; unsigned long *addr_p = unwind_get_return_address_ptr(state); if (unwind_done(state)) return 0; >> addr = ftrace_graph_ret_addr(state->task, &state->graph_idx, *addr_p, addr_p); return __kernel_text_address(addr) ? addr : 0; } ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-15 19:05 ` Vince Weaver @ 2016-11-15 20:57 ` Josh Poimboeuf 2016-11-16 13:03 ` Peter Zijlstra 0 siblings, 1 reply; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-15 20:57 UTC (permalink / raw) To: Vince Weaver Cc: Peter Zijlstra, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Tue, Nov 15, 2016 at 02:05:50PM -0500, Vince Weaver wrote: > On Tue, 15 Nov 2016, Peter Zijlstra wrote: > > > On Tue, Nov 15, 2016 at 12:43:56PM -0500, Vince Weaver wrote: > > > > > > Running on my haswell machine with the imc/uncore patch applied, the > > > perf_fuzzer next tripped over this issue. > > > > > > [ 202.034495] BAD LUCK: lost 371 message(s) from NMI context! > > > [ 202.034496] ================================================================== > > > [ 202.048327] BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x35/0x80 at addr ffff8800cff0bd90 > > > [ 202.058826] Read of size 8 by task perf_fuzzer/16254 > > > [ 202.064186] page:ffffea00033fc2c0 count:1 mapcount:0 mapping: (null) index:0x0^Ac > > > [ 202.073068] flags: 0x1ffff8000000400(reserved) > > > [ 202.077885] page dumped because: kasan: bad access detected > > > [ 202.083880] CPU: 4 PID: 16254 Comm: perf_fuzzer Not tainted 4.9.0-rc5+ #5 > > > [ 202.091204] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 > > > [ 202.099181] ffff8800cff0b1d8^Ac ffffffff816bb796^Ac ffff8800cff0b270^Ac ffff8800cff0bd90^Ac > > > [ 202.107896] ffff8800cff0b260^Ac ffffffff812fbe95^Ac 00007ffc9d1ab480^Ac 0000000000000000^Ac > > > [ 202.116638] ffffffff8125117d^Ac 0000000000000092^Ac 0000000000000000^Ac ffff8800cff0b7c0^Ac > > > [ 202.125339] Call Trace: > > > [ 202.127994] <NMI> [<ffffffff816bb796>] dump_stack+0x63/0x8d > > > [ 202.134184] [<ffffffff812fbe95>] kasan_report_error+0x495/0x4c0 > > > [ 202.140680] [<ffffffff8125117d>] ? perf_output_begin+0x28d/0x4c0 > > > [ 202.147228] [<ffffffff812fc319>] kasan_report+0x39/0x40 > > > [ 202.152987] [<ffffffff81095ce5>] ? unwind_get_return_address+0x35/0x80 > > > [ 202.160094] [<ffffffff812fa8fe>] __asan_load8+0x5e/0x70 > > > [ 202.165859] [<ffffffff81095ce5>] unwind_get_return_address+0x35/0x80 > > > > Josh, any ideas? > > From what I can tell this maps to: > > unsigned long unwind_get_return_address(struct unwind_state *state) > { > unsigned long addr; > unsigned long *addr_p = unwind_get_return_address_ptr(state); > > if (unwind_done(state)) > return 0; > > >> addr = ftrace_graph_ret_addr(state->task, &state->graph_idx, *addr_p, > addr_p); > > return __kernel_text_address(addr) ? addr : 0; > } Hi Vince, Would you mind posting a disassembly of unwind_get_return_address()? Any idea how recreatable it is? (In particular I'd be interested in seeing this dump with the latest unwinder improvements in the -tip tree, which dump the pt_regs associated with an interrupt.) -- Josh ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-15 20:57 ` Josh Poimboeuf @ 2016-11-16 13:03 ` Peter Zijlstra 2016-11-16 13:18 ` Dmitry Vyukov ` (2 more replies) 0 siblings, 3 replies; 33+ messages in thread From: Peter Zijlstra @ 2016-11-16 13:03 UTC (permalink / raw) To: Josh Poimboeuf Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Tue, Nov 15, 2016 at 02:57:48PM -0600, Josh Poimboeuf wrote: > Would you mind posting a disassembly of unwind_get_return_address()? $ objdump -D ivb-dbg/vmlinux | awk '/<[^>]*>:/ { p=0; } /<unwind_get_return_address>:/ { p=1; } { if (p) print $0; }' ffffffff811afd10 <unwind_get_return_address>: ffffffff811afd10: e8 eb cc f4 01 callq ffffffff830fca00 <__fentry__> ffffffff811afd15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811afd1c: fc ff df ffffffff811afd1f: 48 89 fa mov %rdi,%rdx ffffffff811afd22: 53 push %rbx ffffffff811afd23: 48 89 fb mov %rdi,%rbx ffffffff811afd26: 48 c1 ea 03 shr $0x3,%rdx ffffffff811afd2a: 48 83 ec 18 sub $0x18,%rsp ffffffff811afd2e: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx ffffffff811afd32: 48 89 f8 mov %rdi,%rax ffffffff811afd35: 83 e0 07 and $0x7,%eax ffffffff811afd38: 83 c0 03 add $0x3,%eax ffffffff811afd3b: 38 d0 cmp %dl,%al ffffffff811afd3d: 7c 04 jl ffffffff811afd43 <unwind_get_return_address+0x33> ffffffff811afd3f: 84 d2 test %dl,%dl ffffffff811afd41: 75 75 jne ffffffff811afdb8 <unwind_get_return_address+0xa8> ffffffff811afd43: 8b 03 mov (%rbx),%eax ffffffff811afd45: 85 c0 test %eax,%eax ffffffff811afd47: 75 08 jne ffffffff811afd51 <unwind_get_return_address+0x41> ffffffff811afd49: 48 83 c4 18 add $0x18,%rsp ffffffff811afd4d: 31 c0 xor %eax,%eax ffffffff811afd4f: 5b pop %rbx ffffffff811afd50: c3 retq ffffffff811afd51: 48 8d 7b 38 lea 0x38(%rbx),%rdi ffffffff811afd55: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811afd5c: fc ff df ffffffff811afd5f: 48 89 fa mov %rdi,%rdx ffffffff811afd62: 48 c1 ea 03 shr $0x3,%rdx ffffffff811afd66: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) ffffffff811afd6a: 75 53 jne ffffffff811afdbf <unwind_get_return_address+0xaf> ffffffff811afd6c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811afd73: fc ff df ffffffff811afd76: 48 8b 4b 38 mov 0x38(%rbx),%rcx ffffffff811afd7a: 48 89 ca mov %rcx,%rdx ffffffff811afd7d: 48 c1 ea 03 shr $0x3,%rdx ffffffff811afd81: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) ffffffff811afd85: 75 3f jne ffffffff811afdc6 <unwind_get_return_address+0xb6> ffffffff811afd87: 48 8d 7b 28 lea 0x28(%rbx),%rdi ffffffff811afd8b: 48 8b 11 mov (%rcx),%rdx ffffffff811afd8e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811afd95: fc ff df ffffffff811afd98: 48 8d 73 30 lea 0x30(%rbx),%rsi ffffffff811afd9c: 49 89 f8 mov %rdi,%r8 ffffffff811afd9f: 49 c1 e8 03 shr $0x3,%r8 ffffffff811afda3: 41 80 3c 00 00 cmpb $0x0,(%r8,%rax,1) ffffffff811afda8: 75 2e jne ffffffff811afdd8 <unwind_get_return_address+0xc8> ffffffff811afdaa: 48 8b 7b 28 mov 0x28(%rbx),%rdi ffffffff811afdae: 48 83 c4 18 add $0x18,%rsp ffffffff811afdb2: 5b pop %rbx ffffffff811afdb3: e9 08 98 2a 00 jmpq ffffffff814595c0 <ftrace_graph_ret_addr> ffffffff811afdb8: e8 53 7d 42 00 callq ffffffff815d7b10 <__asan_report_load4_noabort> ffffffff811afdbd: eb 84 jmp ffffffff811afd43 <unwind_get_return_address+0x33> ffffffff811afdbf: e8 9c 7d 42 00 callq ffffffff815d7b60 <__asan_report_load8_noabort> ffffffff811afdc4: eb a6 jmp ffffffff811afd6c <unwind_get_return_address+0x5c> ffffffff811afdc6: 48 89 cf mov %rcx,%rdi ffffffff811afdc9: 48 89 0c 24 mov %rcx,(%rsp) ffffffff811afdcd: e8 8e 7d 42 00 callq ffffffff815d7b60 <__asan_report_load8_noabort> ffffffff811afdd2: 48 8b 0c 24 mov (%rsp),%rcx ffffffff811afdd6: eb af jmp ffffffff811afd87 <unwind_get_return_address+0x77> ffffffff811afdd8: 48 89 74 24 10 mov %rsi,0x10(%rsp) ffffffff811afddd: 48 89 54 24 08 mov %rdx,0x8(%rsp) ffffffff811afde2: 48 89 0c 24 mov %rcx,(%rsp) ffffffff811afde6: e8 75 7d 42 00 callq ffffffff815d7b60 <__asan_report_load8_noabort> ffffffff811afdeb: 48 8b 74 24 10 mov 0x10(%rsp),%rsi ffffffff811afdf0: 48 8b 54 24 08 mov 0x8(%rsp),%rdx ffffffff811afdf5: 48 8b 0c 24 mov (%rsp),%rcx ffffffff811afdf9: eb af jmp ffffffff811afdaa <unwind_get_return_address+0x9a> ffffffff811afdfb: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) > Any idea how recreatable it is? (In particular I'd be interested in > seeing this dump with the latest unwinder improvements in the -tip tree, > which dump the pt_regs associated with an interrupt.) Fairly reproducable it seems, doesn't seem to include pt_regs dumps though :/ tip/master as of this morning. 3================================================================== 3BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1ba/0x1f0 at addr ffff88042fc87be0 3Read of size 8 by task swapper/28/0 0page:ffffea0010bf21c0 count:1 mapcount:0 mapping: (null) index:0x0c 0flags: 0x2ffff8000000400(reserved) 1page dumped because: kasan: bad access detected dCPU: 28 PID: 0 Comm: swapper/28 Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #2 dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 dCall Trace: d <NMI> d ? dump_stack+0x5e/0x89 d ? kasan_report_error+0x4a5/0x4d0 d ? __asan_report_load8_noabort+0x45/0x50 d ? __kernel_text_address+0x20/0xa0 d ? unwind_next_frame+0x1ba/0x1f0 d ? unwind_next_frame+0x1ba/0x1f0 d ? perf_callchain_kernel+0x33c/0x540 d ? arch_perf_update_userpage+0x340/0x340 d ? get_perf_callchain+0x24d/0x610 d ? put_callchain_buffers+0x50/0x50 d ? number+0x653/0x830 d ? perf_callchain+0x126/0x190 d ? perf_prepare_sample+0x720/0x1010 d ? perf_event_output_forward+0x81/0xf0 d ? perf_prepare_sample+0x1010/0x1010 d ? pointer+0x880/0x880 d ? perf_event_update_userpage+0x16/0x730 d ? __perf_event_overflow+0x1a0/0x510 d ? intel_pmu_handle_irq+0x34b/0xa90 d ? intel_pmu_save_and_restart+0xd0/0xd0 d ? acpi_os_read_memory+0x205/0x23c d ? format_decode+0xc5/0x7a0 d ? vunmap_page_range+0x26a/0x400 d ? ghes_copy_tofrom_phys+0x141/0x270 d ? ghes_read_estatus+0x112/0x5a0 d ? ghes_copy_tofrom_phys+0x270/0x270 d ? early_printk+0xa4/0xd0 d ? devkmsg_sysctl_set_loglvl+0x160/0x160 d ? perf_event_nmi_handler+0x28/0x40 d ? nmi_handle+0xa1/0x250 d ? default_do_nmi+0x61/0x170 d ? do_nmi+0x191/0x200 d ? end_repeat_nmi+0x1a/0x1e d ? format_decode+0xc5/0x7a0 d ? format_decode+0xc5/0x7a0 d ? format_decode+0xc5/0x7a0 d <EOE> d <IRQ> d ? vsnprintf+0xfc/0x15e0 d ? pointer+0x880/0x880 d ? x86_pmu_enable_all+0x1c0/0x1c0 d ? vscnprintf+0x9/0x30 d ? early_vprintk+0xb0/0x130 d ? trace_raw_output_console+0x160/0x160 d ? memcpy+0x34/0x50 d ? x86_pmu_commit_txn+0x180/0x260 d ? events_sysfs_show+0xb0/0xb0 d ? save_stack+0x33/0xb0 d ? hrtimer_init+0x120/0x120 d ? timerqueue_del+0x62/0x140 d ? perf_event_update_userpage+0x16/0x730 d ? perf_event_update_userpage+0x16/0x730 d ? x86_perf_event_set_period+0x239/0x450 d ? perf_event_update_userpage+0x16/0x730 d ? x86_pmu_enable+0x5f7/0xaa0 d ? printk+0xb6/0xef d ? printk_emit+0xa0/0xa0 d ? _raw_spin_unlock_irqrestore+0x42/0x70 d ? ___ratelimit+0x1e4/0x3f0 d ? irq_work_run_list+0xa1/0xf0 d ? irq_work_run+0x14/0x40 d ? smp_call_function_single_interrupt+0x60/0x80 d ? call_function_single_interrupt+0x89/0x90 d <EOI> d ? cpuidle_enter_state+0x113/0x780 d ? cpuidle_enter_state+0x10e/0x780 d ? cpu_load_update_nohz_stop+0x155/0x1b0 d ? cpu_startup_entry+0x19a/0x2c0 d ? start_cpu+0x5/0x14 3Memory state around the buggy address: 3 ffff88042fc87a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff88042fc87b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3>ffff88042fc87b80: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 3 ^ 3 ffff88042fc87c00: 00 f4 f4 f4 f3 f3 f3 f3 00 00 00 00 00 00 00 00 3 ffff88042fc87c80: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 3================================================================== 3================================================================== 3BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1ba/0x1f0 at addr ffff880424a97878 3Read of size 8 by task perf_fuzzer/3451 0page:ffffea001092a5c0 count:0 mapcount:0 mapping: (null) index:0x0c 0flags: 0x2ffff8000000000() 1page dumped because: kasan: bad access detected dCPU: 28 PID: 3451 Comm: perf_fuzzer Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #2 dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 dCall Trace: d ? dump_stack+0x5e/0x89 d ? kasan_report_error+0x4a5/0x4d0 d ? __asan_report_load8_noabort+0x45/0x50 d ? __kernel_text_address+0x20/0xa0 d ? unwind_next_frame+0x1ba/0x1f0 d ? unwind_next_frame+0x1ba/0x1f0 d ? perf_callchain_kernel+0x33c/0x540 d ? arch_perf_update_userpage+0x340/0x340 d ? get_perf_callchain+0x24d/0x610 d ? put_callchain_buffers+0x50/0x50 d ? ipv6_flowlabel_opt+0x1111/0x17d0 d ? perf_log_itrace_start+0x3a0/0x3a0 d ? cpumask_next_and+0x5a/0xa0 d ? ktime_get_raw_fast_ns+0xd3/0x1e0 d ? perf_callchain+0x126/0x190 d ? perf_prepare_sample+0x720/0x1010 d ? perf_event_output_forward+0x81/0xf0 d ? perf_prepare_sample+0x1010/0x1010 d ? perf_event_update_userpage+0x16/0x730 d ? kasan_unpoison_shadow+0x31/0x40 d ? get_page_from_freelist+0x52e/0x2310 d ? perf_output_begin+0x3a1/0x9b0 d ? cpu_clock_event_add+0x17/0x20 d ? __perf_event_overflow+0x1a0/0x510 d ? perf_swevent_overflow+0x156/0x1f0 d ? perf_tp_event+0x3e8/0x5c0 d ? perf_output_begin_backward+0x960/0x960 d ? perf_tp_event_match.isra.85.part.86+0x140/0x140 d ? __mark_inode_dirty+0x459/0xa50 d ? legitimize_path.isra.28+0x6b/0x150 d ? unlazy_walk+0x456/0x790 d ? memset+0x1f/0x40 d ? perf_trace_writeback_dirty_inode_template+0x3af/0x610 d ? save_stack+0x33/0xb0 d ? inode_congested+0x450/0x450 d ? dput+0x1de/0x530 d ? walk_component+0x2cc/0xdc0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? pick_link+0xbe0/0xbe0 d ? inode_congested+0x450/0x450 d ? __mark_inode_dirty+0x459/0xa50 d ? proc_sys_setattr+0x84/0xb0 d ? notify_change+0x4d6/0xc40 d ? security_inode_need_killpriv+0x58/0x80 d ? do_truncate+0xd7/0x160 d ? file_open_root+0x1a0/0x1a0 d ? path_openat+0x97f/0x3b30 d ? vfs_rename+0x14a0/0x14a0 d ? getname_flags+0xba/0x500 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? do_filp_open+0x175/0x230 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? may_open_dev+0xc0/0xc0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? save_stack+0x33/0xb0 d ? do_sys_open+0x16d/0x310 d ? SyS_write+0xab/0x160 d ? filp_open+0x50/0x50 d ? task_stopped_code+0xf0/0xf0 d ? trace_hardirqs_on_thunk+0x1a/0x1c d ? entry_SYSCALL_64_fastpath+0x18/0xa8 3Memory state around the buggy address: 3 ffff880424a97700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff880424a97780: 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 f3 3>ffff880424a97800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 3 ^ 3 ffff880424a97880: f1 f1 f1 04 f4 f4 f4 f2 f2 f2 f2 00 f4 f4 f4 f3 3 ffff880424a97900: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 3================================================================== ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-16 13:03 ` Peter Zijlstra @ 2016-11-16 13:18 ` Dmitry Vyukov 2016-11-16 14:37 ` Josh Poimboeuf 2016-11-17 15:57 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf 2 siblings, 0 replies; 33+ messages in thread From: Dmitry Vyukov @ 2016-11-16 13:18 UTC (permalink / raw) To: Peter Zijlstra Cc: Josh Poimboeuf, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, Stephane Eranian On Wed, Nov 16, 2016 at 2:03 PM, Peter Zijlstra <peterz@infradead.org> wrote: > On Tue, Nov 15, 2016 at 02:57:48PM -0600, Josh Poimboeuf wrote: >> Would you mind posting a disassembly of unwind_get_return_address()? > > $ objdump -D ivb-dbg/vmlinux | awk '/<[^>]*>:/ { p=0; } /<unwind_get_return_address>:/ { p=1; } { if (p) print $0; }' > > ffffffff811afd10 <unwind_get_return_address>: > ffffffff811afd10: e8 eb cc f4 01 callq ffffffff830fca00 <__fentry__> > ffffffff811afd15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > ffffffff811afd1c: fc ff df > ffffffff811afd1f: 48 89 fa mov %rdi,%rdx > ffffffff811afd22: 53 push %rbx > ffffffff811afd23: 48 89 fb mov %rdi,%rbx > ffffffff811afd26: 48 c1 ea 03 shr $0x3,%rdx > ffffffff811afd2a: 48 83 ec 18 sub $0x18,%rsp > ffffffff811afd2e: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx > ffffffff811afd32: 48 89 f8 mov %rdi,%rax > ffffffff811afd35: 83 e0 07 and $0x7,%eax > ffffffff811afd38: 83 c0 03 add $0x3,%eax > ffffffff811afd3b: 38 d0 cmp %dl,%al > ffffffff811afd3d: 7c 04 jl ffffffff811afd43 <unwind_get_return_address+0x33> > ffffffff811afd3f: 84 d2 test %dl,%dl > ffffffff811afd41: 75 75 jne ffffffff811afdb8 <unwind_get_return_address+0xa8> > ffffffff811afd43: 8b 03 mov (%rbx),%eax > ffffffff811afd45: 85 c0 test %eax,%eax > ffffffff811afd47: 75 08 jne ffffffff811afd51 <unwind_get_return_address+0x41> > ffffffff811afd49: 48 83 c4 18 add $0x18,%rsp > ffffffff811afd4d: 31 c0 xor %eax,%eax > ffffffff811afd4f: 5b pop %rbx > ffffffff811afd50: c3 retq > ffffffff811afd51: 48 8d 7b 38 lea 0x38(%rbx),%rdi > ffffffff811afd55: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > ffffffff811afd5c: fc ff df > ffffffff811afd5f: 48 89 fa mov %rdi,%rdx > ffffffff811afd62: 48 c1 ea 03 shr $0x3,%rdx > ffffffff811afd66: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) > ffffffff811afd6a: 75 53 jne ffffffff811afdbf <unwind_get_return_address+0xaf> > ffffffff811afd6c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > ffffffff811afd73: fc ff df > ffffffff811afd76: 48 8b 4b 38 mov 0x38(%rbx),%rcx > ffffffff811afd7a: 48 89 ca mov %rcx,%rdx > ffffffff811afd7d: 48 c1 ea 03 shr $0x3,%rdx > ffffffff811afd81: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) > ffffffff811afd85: 75 3f jne ffffffff811afdc6 <unwind_get_return_address+0xb6> > ffffffff811afd87: 48 8d 7b 28 lea 0x28(%rbx),%rdi > ffffffff811afd8b: 48 8b 11 mov (%rcx),%rdx > ffffffff811afd8e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > ffffffff811afd95: fc ff df > ffffffff811afd98: 48 8d 73 30 lea 0x30(%rbx),%rsi > ffffffff811afd9c: 49 89 f8 mov %rdi,%r8 > ffffffff811afd9f: 49 c1 e8 03 shr $0x3,%r8 > ffffffff811afda3: 41 80 3c 00 00 cmpb $0x0,(%r8,%rax,1) > ffffffff811afda8: 75 2e jne ffffffff811afdd8 <unwind_get_return_address+0xc8> > ffffffff811afdaa: 48 8b 7b 28 mov 0x28(%rbx),%rdi > ffffffff811afdae: 48 83 c4 18 add $0x18,%rsp > ffffffff811afdb2: 5b pop %rbx > ffffffff811afdb3: e9 08 98 2a 00 jmpq ffffffff814595c0 <ftrace_graph_ret_addr> > ffffffff811afdb8: e8 53 7d 42 00 callq ffffffff815d7b10 <__asan_report_load4_noabort> > ffffffff811afdbd: eb 84 jmp ffffffff811afd43 <unwind_get_return_address+0x33> > ffffffff811afdbf: e8 9c 7d 42 00 callq ffffffff815d7b60 <__asan_report_load8_noabort> > ffffffff811afdc4: eb a6 jmp ffffffff811afd6c <unwind_get_return_address+0x5c> > ffffffff811afdc6: 48 89 cf mov %rcx,%rdi > ffffffff811afdc9: 48 89 0c 24 mov %rcx,(%rsp) > ffffffff811afdcd: e8 8e 7d 42 00 callq ffffffff815d7b60 <__asan_report_load8_noabort> > ffffffff811afdd2: 48 8b 0c 24 mov (%rsp),%rcx > ffffffff811afdd6: eb af jmp ffffffff811afd87 <unwind_get_return_address+0x77> > ffffffff811afdd8: 48 89 74 24 10 mov %rsi,0x10(%rsp) > ffffffff811afddd: 48 89 54 24 08 mov %rdx,0x8(%rsp) > ffffffff811afde2: 48 89 0c 24 mov %rcx,(%rsp) > ffffffff811afde6: e8 75 7d 42 00 callq ffffffff815d7b60 <__asan_report_load8_noabort> > ffffffff811afdeb: 48 8b 74 24 10 mov 0x10(%rsp),%rsi > ffffffff811afdf0: 48 8b 54 24 08 mov 0x8(%rsp),%rdx > ffffffff811afdf5: 48 8b 0c 24 mov (%rsp),%rcx > ffffffff811afdf9: eb af jmp ffffffff811afdaa <unwind_get_return_address+0x9a> > ffffffff811afdfb: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) > >> Any idea how recreatable it is? (In particular I'd be interested in >> seeing this dump with the latest unwinder improvements in the -tip tree, >> which dump the pt_regs associated with an interrupt.) > > Fairly reproducable it seems, doesn't seem to include pt_regs dumps > though :/ > > tip/master as of this morning. Can you print the stack that it gets after unwinding? If we will see some garbage there, then it will confirm that it reads from redzones. You can check taint before/after unwind and dump the stack iff kernel become tainted during unwind. > 3================================================================== > 3BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1ba/0x1f0 at addr ffff88042fc87be0 > 3Read of size 8 by task swapper/28/0 > 0page:ffffea0010bf21c0 count:1 mapcount:0 mapping: (null) index:0x0c > 0flags: 0x2ffff8000000400(reserved) > 1page dumped because: kasan: bad access detected > dCPU: 28 PID: 0 Comm: swapper/28 Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #2 > dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 > dCall Trace: > d <NMI> > d ? dump_stack+0x5e/0x89 > d ? kasan_report_error+0x4a5/0x4d0 > d ? __asan_report_load8_noabort+0x45/0x50 > d ? __kernel_text_address+0x20/0xa0 > d ? unwind_next_frame+0x1ba/0x1f0 > d ? unwind_next_frame+0x1ba/0x1f0 > d ? perf_callchain_kernel+0x33c/0x540 > d ? arch_perf_update_userpage+0x340/0x340 > d ? get_perf_callchain+0x24d/0x610 > d ? put_callchain_buffers+0x50/0x50 > d ? number+0x653/0x830 > d ? perf_callchain+0x126/0x190 > d ? perf_prepare_sample+0x720/0x1010 > d ? perf_event_output_forward+0x81/0xf0 > d ? perf_prepare_sample+0x1010/0x1010 > d ? pointer+0x880/0x880 > d ? perf_event_update_userpage+0x16/0x730 > d ? __perf_event_overflow+0x1a0/0x510 > d ? intel_pmu_handle_irq+0x34b/0xa90 > d ? intel_pmu_save_and_restart+0xd0/0xd0 > d ? acpi_os_read_memory+0x205/0x23c > d ? format_decode+0xc5/0x7a0 > d ? vunmap_page_range+0x26a/0x400 > d ? ghes_copy_tofrom_phys+0x141/0x270 > d ? ghes_read_estatus+0x112/0x5a0 > d ? ghes_copy_tofrom_phys+0x270/0x270 > d ? early_printk+0xa4/0xd0 > d ? devkmsg_sysctl_set_loglvl+0x160/0x160 > d ? perf_event_nmi_handler+0x28/0x40 > d ? nmi_handle+0xa1/0x250 > d ? default_do_nmi+0x61/0x170 > d ? do_nmi+0x191/0x200 > d ? end_repeat_nmi+0x1a/0x1e > d ? format_decode+0xc5/0x7a0 > d ? format_decode+0xc5/0x7a0 > d ? format_decode+0xc5/0x7a0 > d <EOE> > d <IRQ> > d ? vsnprintf+0xfc/0x15e0 > d ? pointer+0x880/0x880 > d ? x86_pmu_enable_all+0x1c0/0x1c0 > d ? vscnprintf+0x9/0x30 > d ? early_vprintk+0xb0/0x130 > d ? trace_raw_output_console+0x160/0x160 > d ? memcpy+0x34/0x50 > d ? x86_pmu_commit_txn+0x180/0x260 > d ? events_sysfs_show+0xb0/0xb0 > d ? save_stack+0x33/0xb0 > d ? hrtimer_init+0x120/0x120 > d ? timerqueue_del+0x62/0x140 > d ? perf_event_update_userpage+0x16/0x730 > d ? perf_event_update_userpage+0x16/0x730 > d ? x86_perf_event_set_period+0x239/0x450 > d ? perf_event_update_userpage+0x16/0x730 > d ? x86_pmu_enable+0x5f7/0xaa0 > d ? printk+0xb6/0xef > d ? printk_emit+0xa0/0xa0 > d ? _raw_spin_unlock_irqrestore+0x42/0x70 > d ? ___ratelimit+0x1e4/0x3f0 > d ? irq_work_run_list+0xa1/0xf0 > d ? irq_work_run+0x14/0x40 > d ? smp_call_function_single_interrupt+0x60/0x80 > d ? call_function_single_interrupt+0x89/0x90 > d <EOI> > d ? cpuidle_enter_state+0x113/0x780 > d ? cpuidle_enter_state+0x10e/0x780 > d ? cpu_load_update_nohz_stop+0x155/0x1b0 > d ? cpu_startup_entry+0x19a/0x2c0 > d ? start_cpu+0x5/0x14 > 3Memory state around the buggy address: > 3 ffff88042fc87a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3 ffff88042fc87b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3>ffff88042fc87b80: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 > 3 ^ > 3 ffff88042fc87c00: 00 f4 f4 f4 f3 f3 f3 f3 00 00 00 00 00 00 00 00 > 3 ffff88042fc87c80: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 > 3================================================================== > > > 3================================================================== > 3BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1ba/0x1f0 at addr ffff880424a97878 > 3Read of size 8 by task perf_fuzzer/3451 > 0page:ffffea001092a5c0 count:0 mapcount:0 mapping: (null) index:0x0c > 0flags: 0x2ffff8000000000() > 1page dumped because: kasan: bad access detected > dCPU: 28 PID: 3451 Comm: perf_fuzzer Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #2 > dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 > dCall Trace: > d ? dump_stack+0x5e/0x89 > d ? kasan_report_error+0x4a5/0x4d0 > d ? __asan_report_load8_noabort+0x45/0x50 > d ? __kernel_text_address+0x20/0xa0 > d ? unwind_next_frame+0x1ba/0x1f0 > d ? unwind_next_frame+0x1ba/0x1f0 > d ? perf_callchain_kernel+0x33c/0x540 > d ? arch_perf_update_userpage+0x340/0x340 > d ? get_perf_callchain+0x24d/0x610 > d ? put_callchain_buffers+0x50/0x50 > d ? ipv6_flowlabel_opt+0x1111/0x17d0 > d ? perf_log_itrace_start+0x3a0/0x3a0 > d ? cpumask_next_and+0x5a/0xa0 > d ? ktime_get_raw_fast_ns+0xd3/0x1e0 > d ? perf_callchain+0x126/0x190 > d ? perf_prepare_sample+0x720/0x1010 > d ? perf_event_output_forward+0x81/0xf0 > d ? perf_prepare_sample+0x1010/0x1010 > d ? perf_event_update_userpage+0x16/0x730 > d ? kasan_unpoison_shadow+0x31/0x40 > d ? get_page_from_freelist+0x52e/0x2310 > d ? perf_output_begin+0x3a1/0x9b0 > d ? cpu_clock_event_add+0x17/0x20 > d ? __perf_event_overflow+0x1a0/0x510 > d ? perf_swevent_overflow+0x156/0x1f0 > d ? perf_tp_event+0x3e8/0x5c0 > d ? perf_output_begin_backward+0x960/0x960 > d ? perf_tp_event_match.isra.85.part.86+0x140/0x140 > d ? __mark_inode_dirty+0x459/0xa50 > d ? legitimize_path.isra.28+0x6b/0x150 > d ? unlazy_walk+0x456/0x790 > d ? memset+0x1f/0x40 > d ? perf_trace_writeback_dirty_inode_template+0x3af/0x610 > d ? save_stack+0x33/0xb0 > d ? inode_congested+0x450/0x450 > d ? dput+0x1de/0x530 > d ? walk_component+0x2cc/0xdc0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? pick_link+0xbe0/0xbe0 > d ? inode_congested+0x450/0x450 > d ? __mark_inode_dirty+0x459/0xa50 > d ? proc_sys_setattr+0x84/0xb0 > d ? notify_change+0x4d6/0xc40 > d ? security_inode_need_killpriv+0x58/0x80 > d ? do_truncate+0xd7/0x160 > d ? file_open_root+0x1a0/0x1a0 > d ? path_openat+0x97f/0x3b30 > d ? vfs_rename+0x14a0/0x14a0 > d ? getname_flags+0xba/0x500 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? do_filp_open+0x175/0x230 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? may_open_dev+0xc0/0xc0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? do_sys_open+0x16d/0x310 > d ? SyS_write+0xab/0x160 > d ? filp_open+0x50/0x50 > d ? task_stopped_code+0xf0/0xf0 > d ? trace_hardirqs_on_thunk+0x1a/0x1c > d ? entry_SYSCALL_64_fastpath+0x18/0xa8 > 3Memory state around the buggy address: > 3 ffff880424a97700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3 ffff880424a97780: 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 f3 > 3>ffff880424a97800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 > 3 ^ > 3 ffff880424a97880: f1 f1 f1 04 f4 f4 f4 f2 f2 f2 f2 00 f4 f4 f4 f3 > 3 ffff880424a97900: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3================================================================== > > > ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-16 13:03 ` Peter Zijlstra 2016-11-16 13:18 ` Dmitry Vyukov @ 2016-11-16 14:37 ` Josh Poimboeuf 2016-11-16 14:49 ` Peter Zijlstra 2016-11-17 15:57 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf 2 siblings, 1 reply; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-16 14:37 UTC (permalink / raw) To: Peter Zijlstra Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Wed, Nov 16, 2016 at 02:03:37PM +0100, Peter Zijlstra wrote: > On Tue, Nov 15, 2016 at 02:57:48PM -0600, Josh Poimboeuf wrote: > > Would you mind posting a disassembly of unwind_get_return_address()? > > Any idea how recreatable it is? (In particular I'd be interested in > > seeing this dump with the latest unwinder improvements in the -tip tree, > > which dump the pt_regs associated with an interrupt.) > > Fairly reproducable it seems, doesn't seem to include pt_regs dumps > though :/ > > tip/master as of this morning. Thanks. This is actually a different issue than the one reported by Vince. In this case FRAME_POINTER is disabled, so it uses the "guess" unwinder which scans every address on the stack, looking for text addresses. So the kasan errors are expected. (The missing pt_regs are also expected: the guess unwinder doesn't show them.) I'll work up a patch to fix this. I still have no idea what's causing Vince's bug in the frame pointer unwinder. > 3================================================================== > 3BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1ba/0x1f0 at addr ffff88042fc87be0 > 3Read of size 8 by task swapper/28/0 > 0page:ffffea0010bf21c0 count:1 mapcount:0 mapping: (null) index:0x0c > 0flags: 0x2ffff8000000400(reserved) > 1page dumped because: kasan: bad access detected > dCPU: 28 PID: 0 Comm: swapper/28 Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #2 > dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 > dCall Trace: > d <NMI> > d ? dump_stack+0x5e/0x89 > d ? kasan_report_error+0x4a5/0x4d0 > d ? __asan_report_load8_noabort+0x45/0x50 > d ? __kernel_text_address+0x20/0xa0 > d ? unwind_next_frame+0x1ba/0x1f0 > d ? unwind_next_frame+0x1ba/0x1f0 > d ? perf_callchain_kernel+0x33c/0x540 > d ? arch_perf_update_userpage+0x340/0x340 > d ? get_perf_callchain+0x24d/0x610 > d ? put_callchain_buffers+0x50/0x50 > d ? number+0x653/0x830 > d ? perf_callchain+0x126/0x190 > d ? perf_prepare_sample+0x720/0x1010 > d ? perf_event_output_forward+0x81/0xf0 > d ? perf_prepare_sample+0x1010/0x1010 > d ? pointer+0x880/0x880 > d ? perf_event_update_userpage+0x16/0x730 > d ? __perf_event_overflow+0x1a0/0x510 > d ? intel_pmu_handle_irq+0x34b/0xa90 > d ? intel_pmu_save_and_restart+0xd0/0xd0 > d ? acpi_os_read_memory+0x205/0x23c > d ? format_decode+0xc5/0x7a0 > d ? vunmap_page_range+0x26a/0x400 > d ? ghes_copy_tofrom_phys+0x141/0x270 > d ? ghes_read_estatus+0x112/0x5a0 > d ? ghes_copy_tofrom_phys+0x270/0x270 > d ? early_printk+0xa4/0xd0 > d ? devkmsg_sysctl_set_loglvl+0x160/0x160 > d ? perf_event_nmi_handler+0x28/0x40 > d ? nmi_handle+0xa1/0x250 > d ? default_do_nmi+0x61/0x170 > d ? do_nmi+0x191/0x200 > d ? end_repeat_nmi+0x1a/0x1e > d ? format_decode+0xc5/0x7a0 > d ? format_decode+0xc5/0x7a0 > d ? format_decode+0xc5/0x7a0 > d <EOE> > d <IRQ> > d ? vsnprintf+0xfc/0x15e0 > d ? pointer+0x880/0x880 > d ? x86_pmu_enable_all+0x1c0/0x1c0 > d ? vscnprintf+0x9/0x30 > d ? early_vprintk+0xb0/0x130 > d ? trace_raw_output_console+0x160/0x160 > d ? memcpy+0x34/0x50 > d ? x86_pmu_commit_txn+0x180/0x260 > d ? events_sysfs_show+0xb0/0xb0 > d ? save_stack+0x33/0xb0 > d ? hrtimer_init+0x120/0x120 > d ? timerqueue_del+0x62/0x140 > d ? perf_event_update_userpage+0x16/0x730 > d ? perf_event_update_userpage+0x16/0x730 > d ? x86_perf_event_set_period+0x239/0x450 > d ? perf_event_update_userpage+0x16/0x730 > d ? x86_pmu_enable+0x5f7/0xaa0 > d ? printk+0xb6/0xef > d ? printk_emit+0xa0/0xa0 > d ? _raw_spin_unlock_irqrestore+0x42/0x70 > d ? ___ratelimit+0x1e4/0x3f0 > d ? irq_work_run_list+0xa1/0xf0 > d ? irq_work_run+0x14/0x40 > d ? smp_call_function_single_interrupt+0x60/0x80 > d ? call_function_single_interrupt+0x89/0x90 > d <EOI> > d ? cpuidle_enter_state+0x113/0x780 > d ? cpuidle_enter_state+0x10e/0x780 > d ? cpu_load_update_nohz_stop+0x155/0x1b0 > d ? cpu_startup_entry+0x19a/0x2c0 > d ? start_cpu+0x5/0x14 > 3Memory state around the buggy address: > 3 ffff88042fc87a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3 ffff88042fc87b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3>ffff88042fc87b80: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 > 3 ^ > 3 ffff88042fc87c00: 00 f4 f4 f4 f3 f3 f3 f3 00 00 00 00 00 00 00 00 > 3 ffff88042fc87c80: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 > 3================================================================== > > > 3================================================================== > 3BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1ba/0x1f0 at addr ffff880424a97878 > 3Read of size 8 by task perf_fuzzer/3451 > 0page:ffffea001092a5c0 count:0 mapcount:0 mapping: (null) index:0x0c > 0flags: 0x2ffff8000000000() > 1page dumped because: kasan: bad access detected > dCPU: 28 PID: 3451 Comm: perf_fuzzer Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #2 > dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 > dCall Trace: > d ? dump_stack+0x5e/0x89 > d ? kasan_report_error+0x4a5/0x4d0 > d ? __asan_report_load8_noabort+0x45/0x50 > d ? __kernel_text_address+0x20/0xa0 > d ? unwind_next_frame+0x1ba/0x1f0 > d ? unwind_next_frame+0x1ba/0x1f0 > d ? perf_callchain_kernel+0x33c/0x540 > d ? arch_perf_update_userpage+0x340/0x340 > d ? get_perf_callchain+0x24d/0x610 > d ? put_callchain_buffers+0x50/0x50 > d ? ipv6_flowlabel_opt+0x1111/0x17d0 > d ? perf_log_itrace_start+0x3a0/0x3a0 > d ? cpumask_next_and+0x5a/0xa0 > d ? ktime_get_raw_fast_ns+0xd3/0x1e0 > d ? perf_callchain+0x126/0x190 > d ? perf_prepare_sample+0x720/0x1010 > d ? perf_event_output_forward+0x81/0xf0 > d ? perf_prepare_sample+0x1010/0x1010 > d ? perf_event_update_userpage+0x16/0x730 > d ? kasan_unpoison_shadow+0x31/0x40 > d ? get_page_from_freelist+0x52e/0x2310 > d ? perf_output_begin+0x3a1/0x9b0 > d ? cpu_clock_event_add+0x17/0x20 > d ? __perf_event_overflow+0x1a0/0x510 > d ? perf_swevent_overflow+0x156/0x1f0 > d ? perf_tp_event+0x3e8/0x5c0 > d ? perf_output_begin_backward+0x960/0x960 > d ? perf_tp_event_match.isra.85.part.86+0x140/0x140 > d ? __mark_inode_dirty+0x459/0xa50 > d ? legitimize_path.isra.28+0x6b/0x150 > d ? unlazy_walk+0x456/0x790 > d ? memset+0x1f/0x40 > d ? perf_trace_writeback_dirty_inode_template+0x3af/0x610 > d ? save_stack+0x33/0xb0 > d ? inode_congested+0x450/0x450 > d ? dput+0x1de/0x530 > d ? walk_component+0x2cc/0xdc0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? pick_link+0xbe0/0xbe0 > d ? inode_congested+0x450/0x450 > d ? __mark_inode_dirty+0x459/0xa50 > d ? proc_sys_setattr+0x84/0xb0 > d ? notify_change+0x4d6/0xc40 > d ? security_inode_need_killpriv+0x58/0x80 > d ? do_truncate+0xd7/0x160 > d ? file_open_root+0x1a0/0x1a0 > d ? path_openat+0x97f/0x3b30 > d ? vfs_rename+0x14a0/0x14a0 > d ? getname_flags+0xba/0x500 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? do_filp_open+0x175/0x230 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? may_open_dev+0xc0/0xc0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? save_stack+0x33/0xb0 > d ? do_sys_open+0x16d/0x310 > d ? SyS_write+0xab/0x160 > d ? filp_open+0x50/0x50 > d ? task_stopped_code+0xf0/0xf0 > d ? trace_hardirqs_on_thunk+0x1a/0x1c > d ? entry_SYSCALL_64_fastpath+0x18/0xa8 > 3Memory state around the buggy address: > 3 ffff880424a97700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3 ffff880424a97780: 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 f3 > 3>ffff880424a97800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 > 3 ^ > 3 ffff880424a97880: f1 f1 f1 04 f4 f4 f4 f2 f2 f2 f2 00 f4 f4 f4 f3 > 3 ffff880424a97900: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3================================================================== -- Josh ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-16 14:37 ` Josh Poimboeuf @ 2016-11-16 14:49 ` Peter Zijlstra 2016-11-16 14:58 ` Josh Poimboeuf ` (2 more replies) 0 siblings, 3 replies; 33+ messages in thread From: Peter Zijlstra @ 2016-11-16 14:49 UTC (permalink / raw) To: Josh Poimboeuf Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Wed, Nov 16, 2016 at 08:37:46AM -0600, Josh Poimboeuf wrote: > On Wed, Nov 16, 2016 at 02:03:37PM +0100, Peter Zijlstra wrote: > > On Tue, Nov 15, 2016 at 02:57:48PM -0600, Josh Poimboeuf wrote: > > > Would you mind posting a disassembly of unwind_get_return_address()? > > > Any idea how recreatable it is? (In particular I'd be interested in > > > seeing this dump with the latest unwinder improvements in the -tip tree, > > > which dump the pt_regs associated with an interrupt.) > > > > Fairly reproducable it seems, doesn't seem to include pt_regs dumps > > though :/ > > > > tip/master as of this morning. > > Thanks. This is actually a different issue than the one reported by > Vince. In this case FRAME_POINTER is disabled, so it uses the "guess" > unwinder which scans every address on the stack, looking for text > addresses. So the kasan errors are expected. > > (The missing pt_regs are also expected: the guess unwinder doesn't show > them.) > > I'll work up a patch to fix this. I still have no idea what's causing > Vince's bug in the frame pointer unwinder. Hurm,.. by the number of '?' entries in Vince's backtrace I was assuming it was without frame pointers. Let me enable those and run again, it didn't insta-trigger like it does without. ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-16 14:49 ` Peter Zijlstra @ 2016-11-16 14:58 ` Josh Poimboeuf 2016-11-16 14:58 ` Peter Zijlstra 2016-11-16 15:06 ` perf: fuzzer KASAN unwind_get_return_address Vince Weaver 2 siblings, 0 replies; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-16 14:58 UTC (permalink / raw) To: Peter Zijlstra Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Wed, Nov 16, 2016 at 03:49:43PM +0100, Peter Zijlstra wrote: > On Wed, Nov 16, 2016 at 08:37:46AM -0600, Josh Poimboeuf wrote: > > On Wed, Nov 16, 2016 at 02:03:37PM +0100, Peter Zijlstra wrote: > > > On Tue, Nov 15, 2016 at 02:57:48PM -0600, Josh Poimboeuf wrote: > > > > Would you mind posting a disassembly of unwind_get_return_address()? > > > > Any idea how recreatable it is? (In particular I'd be interested in > > > > seeing this dump with the latest unwinder improvements in the -tip tree, > > > > which dump the pt_regs associated with an interrupt.) > > > > > > Fairly reproducable it seems, doesn't seem to include pt_regs dumps > > > though :/ > > > > > > tip/master as of this morning. > > > > Thanks. This is actually a different issue than the one reported by > > Vince. In this case FRAME_POINTER is disabled, so it uses the "guess" > > unwinder which scans every address on the stack, looking for text > > addresses. So the kasan errors are expected. > > > > (The missing pt_regs are also expected: the guess unwinder doesn't show > > them.) > > > > I'll work up a patch to fix this. I still have no idea what's causing > > Vince's bug in the frame pointer unwinder. > > Hurm,.. by the number of '?' entries in Vince's backtrace I was assuming > it was without frame pointers. When frame pointers are disabled, *all* the addresses are prefixed with '?'. When frame pointers are enabled, and there are a lot of '?' addresses, it usually means the containing functions reserved a lot of stack space and the printed addresses are mostly leftovers from previous runs. > Let me enable those and run again, it didn't insta-trigger like it does > without. Thanks! -- Josh ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-16 14:49 ` Peter Zijlstra 2016-11-16 14:58 ` Josh Poimboeuf @ 2016-11-16 14:58 ` Peter Zijlstra 2016-11-17 4:48 ` Josh Poimboeuf 2016-11-16 15:06 ` perf: fuzzer KASAN unwind_get_return_address Vince Weaver 2 siblings, 1 reply; 33+ messages in thread From: Peter Zijlstra @ 2016-11-16 14:58 UTC (permalink / raw) To: Josh Poimboeuf Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Wed, Nov 16, 2016 at 03:49:43PM +0100, Peter Zijlstra wrote: > Let me enable those and run again, it didn't insta-trigger like it does > without. Tada! $ objdump -D ivb-dbg/vmlinux | awk '/<[^>]*>:/ { p = 0; } /<unwind_get_return_address>:/ { p = 1; } { if (p) print $0; }' ffffffff811c70d0 <unwind_get_return_address>: ffffffff811c70d0: e8 8b 61 0e 02 callq ffffffff832ad260 <__fentry__> ffffffff811c70d5: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811c70dc: fc ff df ffffffff811c70df: 55 push %rbp ffffffff811c70e0: 48 89 fa mov %rdi,%rdx ffffffff811c70e3: 48 89 e5 mov %rsp,%rbp ffffffff811c70e6: 48 c1 ea 03 shr $0x3,%rdx ffffffff811c70ea: 41 56 push %r14 ffffffff811c70ec: 41 55 push %r13 ffffffff811c70ee: 41 54 push %r12 ffffffff811c70f0: 53 push %rbx ffffffff811c70f1: 48 89 fb mov %rdi,%rbx ffffffff811c70f4: 48 83 ec 10 sub $0x10,%rsp ffffffff811c70f8: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx ffffffff811c70fc: 48 89 f8 mov %rdi,%rax ffffffff811c70ff: 83 e0 07 and $0x7,%eax ffffffff811c7102: 83 c0 03 add $0x3,%eax ffffffff811c7105: 38 d0 cmp %dl,%al ffffffff811c7107: 7c 08 jl ffffffff811c7111 <unwind_get_return_address+0x41> ffffffff811c7109: 84 d2 test %dl,%dl ffffffff811c710b: 0f 85 0e 01 00 00 jne ffffffff811c721f <unwind_get_return_address+0x14f> ffffffff811c7111: 8b 03 mov (%rbx),%eax ffffffff811c7113: 85 c0 test %eax,%eax ffffffff811c7115: 0f 84 c9 00 00 00 je ffffffff811c71e4 <unwind_get_return_address+0x114> ffffffff811c711b: 48 8d 7b 40 lea 0x40(%rbx),%rdi ffffffff811c711f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811c7126: fc ff df ffffffff811c7129: 48 89 fa mov %rdi,%rdx ffffffff811c712c: 48 c1 ea 03 shr $0x3,%rdx ffffffff811c7130: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) ffffffff811c7134: 0f 85 ef 00 00 00 jne ffffffff811c7229 <unwind_get_return_address+0x159> ffffffff811c713a: 4c 8b 63 40 mov 0x40(%rbx),%r12 ffffffff811c713e: 4d 85 e4 test %r12,%r12 ffffffff811c7141: 0f 84 ac 00 00 00 je ffffffff811c71f3 <unwind_get_return_address+0x123> ffffffff811c7147: 49 8d bc 24 88 00 00 lea 0x88(%r12),%rdi ffffffff811c714e: 00 ffffffff811c714f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811c7156: fc ff df ffffffff811c7159: 48 89 f9 mov %rdi,%rcx ffffffff811c715c: 48 c1 e9 03 shr $0x3,%rcx ffffffff811c7160: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) ffffffff811c7164: 0f 85 4f 01 00 00 jne ffffffff811c72b9 <unwind_get_return_address+0x1e9> ffffffff811c716a: 41 f6 84 24 88 00 00 testb $0x3,0x88(%r12) ffffffff811c7171: 00 03 ffffffff811c7173: 75 6f jne ffffffff811c71e4 <unwind_get_return_address+0x114> ffffffff811c7175: 49 83 ec 80 sub $0xffffffffffffff80,%r12 ffffffff811c7179: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811c7180: fc ff df ffffffff811c7183: 4c 89 e2 mov %r12,%rdx ffffffff811c7186: 48 c1 ea 03 shr $0x3,%rdx ffffffff811c718a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) ffffffff811c718e: 0f 85 2f 01 00 00 jne ffffffff811c72c3 <unwind_get_return_address+0x1f3> ffffffff811c7194: 4c 8d 73 28 lea 0x28(%rbx),%r14 ffffffff811c7198: 49 8b 14 24 mov (%r12),%rdx ffffffff811c719c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811c71a3: fc ff df ffffffff811c71a6: 48 8d 73 30 lea 0x30(%rbx),%rsi ffffffff811c71aa: 4c 89 f1 mov %r14,%rcx ffffffff811c71ad: 48 c1 e9 03 shr $0x3,%rcx ffffffff811c71b1: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) ffffffff811c71b5: 0f 85 15 01 00 00 jne ffffffff811c72d0 <unwind_get_return_address+0x200> ffffffff811c71bb: 48 8b 7b 28 mov 0x28(%rbx),%rdi ffffffff811c71bf: 4c 89 e1 mov %r12,%rcx ffffffff811c71c2: e8 59 7a 2c 00 callq ffffffff8148ec20 <ftrace_graph_ret_addr> ffffffff811c71c7: 48 89 c7 mov %rax,%rdi ffffffff811c71ca: 49 89 c5 mov %rax,%r13 ffffffff811c71cd: e8 9e 30 0c 00 callq ffffffff8128a270 <__kernel_text_address> ffffffff811c71d2: 89 c2 mov %eax,%edx ffffffff811c71d4: 4c 89 e8 mov %r13,%rax ffffffff811c71d7: 85 d2 test %edx,%edx ffffffff811c71d9: 75 0b jne ffffffff811c71e6 <unwind_get_return_address+0x116> ffffffff811c71db: 80 3d 18 29 f9 02 00 cmpb $0x0,0x2f92918(%rip) # ffffffff84159afa <__print_once.27085> ffffffff811c71e2: 74 4f je ffffffff811c7233 <unwind_get_return_address+0x163> ffffffff811c71e4: 31 c0 xor %eax,%eax ffffffff811c71e6: 48 83 c4 10 add $0x10,%rsp ffffffff811c71ea: 5b pop %rbx ffffffff811c71eb: 41 5c pop %r12 ffffffff811c71ed: 41 5d pop %r13 ffffffff811c71ef: 41 5e pop %r14 ffffffff811c71f1: 5d pop %rbp ffffffff811c71f2: c3 retq ffffffff811c71f3: 48 8d 7b 38 lea 0x38(%rbx),%rdi ffffffff811c71f7: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811c71fe: fc ff df ffffffff811c7201: 48 89 fa mov %rdi,%rdx ffffffff811c7204: 48 c1 ea 03 shr $0x3,%rdx ffffffff811c7208: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) ffffffff811c720c: 0f 85 9d 00 00 00 jne ffffffff811c72af <unwind_get_return_address+0x1df> ffffffff811c7212: 48 8b 43 38 mov 0x38(%rbx),%rax ffffffff811c7216: 4c 8d 60 08 lea 0x8(%rax),%r12 ffffffff811c721a: e9 5a ff ff ff jmpq ffffffff811c7179 <unwind_get_return_address+0xa9> ffffffff811c721f: e8 6c b0 45 00 callq ffffffff81622290 <__asan_report_load4_noabort> ffffffff811c7224: e9 e8 fe ff ff jmpq ffffffff811c7111 <unwind_get_return_address+0x41> ffffffff811c7229: e8 b2 b0 45 00 callq ffffffff816222e0 <__asan_report_load8_noabort> ffffffff811c722e: e9 07 ff ff ff jmpq ffffffff811c713a <unwind_get_return_address+0x6a> ffffffff811c7233: 4c 89 f2 mov %r14,%rdx ffffffff811c7236: c6 05 bd 28 f9 02 01 movb $0x1,0x2f928bd(%rip) # ffffffff84159afa <__print_once.27085> ffffffff811c723d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811c7244: fc ff df ffffffff811c7247: 48 c1 ea 03 shr $0x3,%rdx ffffffff811c724b: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) ffffffff811c724f: 75 4d jne ffffffff811c729e <unwind_get_return_address+0x1ce> ffffffff811c7251: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax ffffffff811c7258: fc ff df ffffffff811c725b: 48 8b 5b 28 mov 0x28(%rbx),%rbx ffffffff811c725f: 48 8d bb c0 04 00 00 lea 0x4c0(%rbx),%rdi ffffffff811c7266: 48 89 fa mov %rdi,%rdx ffffffff811c7269: 48 c1 ea 03 shr $0x3,%rdx ffffffff811c726d: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax ffffffff811c7271: 84 c0 test %al,%al ffffffff811c7273: 74 04 je ffffffff811c7279 <unwind_get_return_address+0x1a9> ffffffff811c7275: 3c 03 cmp $0x3,%al ffffffff811c7277: 7e 2f jle ffffffff811c72a8 <unwind_get_return_address+0x1d8> ffffffff811c7279: 44 8b 83 c0 04 00 00 mov 0x4c0(%rbx),%r8d ffffffff811c7280: 48 8d 8b 58 06 00 00 lea 0x658(%rbx),%rcx ffffffff811c7287: 4c 89 e2 mov %r12,%rdx ffffffff811c728a: 4c 89 ee mov %r13,%rsi ffffffff811c728d: 48 c7 c7 e0 1d 45 83 mov $0xffffffff83451de0,%rdi ffffffff811c7294: e8 49 8c 35 00 callq ffffffff8151fee2 <printk_deferred> ffffffff811c7299: e9 46 ff ff ff jmpq ffffffff811c71e4 <unwind_get_return_address+0x114> ffffffff811c729e: 4c 89 f7 mov %r14,%rdi ffffffff811c72a1: e8 3a b0 45 00 callq ffffffff816222e0 <__asan_report_load8_noabort> ffffffff811c72a6: eb a9 jmp ffffffff811c7251 <unwind_get_return_address+0x181> ffffffff811c72a8: e8 e3 af 45 00 callq ffffffff81622290 <__asan_report_load4_noabort> ffffffff811c72ad: eb ca jmp ffffffff811c7279 <unwind_get_return_address+0x1a9> ffffffff811c72af: e8 2c b0 45 00 callq ffffffff816222e0 <__asan_report_load8_noabort> ffffffff811c72b4: e9 59 ff ff ff jmpq ffffffff811c7212 <unwind_get_return_address+0x142> ffffffff811c72b9: e8 22 b0 45 00 callq ffffffff816222e0 <__asan_report_load8_noabort> ffffffff811c72be: e9 a7 fe ff ff jmpq ffffffff811c716a <unwind_get_return_address+0x9a> ffffffff811c72c3: 4c 89 e7 mov %r12,%rdi ffffffff811c72c6: e8 15 b0 45 00 callq ffffffff816222e0 <__asan_report_load8_noabort> ffffffff811c72cb: e9 c4 fe ff ff jmpq ffffffff811c7194 <unwind_get_return_address+0xc4> ffffffff811c72d0: 4c 89 f7 mov %r14,%rdi ffffffff811c72d3: 48 89 75 d0 mov %rsi,-0x30(%rbp) ffffffff811c72d7: 48 89 55 d8 mov %rdx,-0x28(%rbp) ffffffff811c72db: e8 00 b0 45 00 callq ffffffff816222e0 <__asan_report_load8_noabort> ffffffff811c72e0: 48 8b 75 d0 mov -0x30(%rbp),%rsi ffffffff811c72e4: 48 8b 55 d8 mov -0x28(%rbp),%rdx ffffffff811c72e8: e9 ce fe ff ff jmpq ffffffff811c71bb <unwind_get_return_address+0xeb> ffffffff811c72ed: 0f 1f 00 nopl (%rax) --- 3================================================================== 3BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x1fb/0x220 at addr ffff88042f88bba0 3Read of size 8 by task swapper/2/0 0page:ffffea0010be22c0 count:1 mapcount:0 mapping: (null) index:0x0c 0flags: 0x2ffff8000000400(reserved) 1page dumped because: kasan: bad access detected dCPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #3 dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 dCall Trace: d <NMI> d dump_stack+0x67/0x94 d kasan_report_error+0x4a1/0x4d0 d ? printk+0xef/0xef d __asan_report_load8_noabort+0x43/0x50 d ? unwind_get_return_address+0x1fb/0x220 d unwind_get_return_address+0x1fb/0x220 d perf_callchain_kernel+0x356/0x550 d ? arch_perf_update_userpage+0x350/0x350 d ? __perf_event_header__init_id+0x500/0x500 d get_perf_callchain+0x276/0x670 d ? put_callchain_buffers+0x50/0x50 d ? sched_clock_cpu+0x11c/0x1a0 d perf_callchain+0x128/0x1a0 d perf_prepare_sample+0x70e/0xfb0 d perf_event_output_forward+0x93/0x110 d ? perf_prepare_sample+0xfb0/0xfb0 d ? arch_perf_update_userpage+0x26c/0x350 d ? sched_clock_cpu+0x11c/0x1a0 d __perf_event_overflow+0x1a3/0x570 d perf_event_overflow+0x14/0x20 d __intel_pmu_pebs_event+0x3ca/0x610 d ? pebs_update_state+0x310/0x310 d ? acpi_map_lookup+0x40/0xad d ? intel_pmu_disable_bts+0xc0/0xc0 d ? acpi_map_lookup+0x40/0xad d ? put_dec+0x1c/0xb0 d ? number+0x71c/0xa70 d ? put_dec+0xb0/0xb0 d intel_pmu_drain_pebs_nhm+0x5f6/0xbf0 d ? __intel_pmu_pebs_event+0x610/0x610 d ? early_serial_putc+0x41/0x70 d ? early_serial_write+0x7c/0xf0 d ? trace_raw_output_console+0x160/0x160 d intel_pmu_handle_irq+0x4b2/0xa90 d ? intel_pmu_save_and_restart+0xe0/0xe0 d ? acpi_os_read_memory+0x228/0x262 d ? acpi_os_get_timer+0x1a/0x1a d ? vunmap_page_range+0x269/0x400 d ? ghes_copy_tofrom_phys+0x149/0x270 d ? ghes_read_estatus+0x11e/0x6b0 d ? ghes_copy_tofrom_phys+0x270/0x270 d perf_event_nmi_handler+0x2d/0x50 d nmi_handle+0x9e/0x250 d default_do_nmi+0x111/0x180 d do_nmi+0x1a2/0x210 d end_repeat_nmi+0x1a/0x1e dRIP: 0010:irq_exit+0x10/0x1d0 dRSP: 0000:ffff88042f887fc8 EFLAGS: 00000046c dRAX: 0000000000000000 RBX: ffffffff83a77980 RCX: 1ffff10080965faf dRDX: 1ffff10085f13747 RSI: 0000000000000000 RDI: ffff88042f89ba38 dRBP: ffff88042f887fd0 R08: ffff8804060b1a08 R09: 1ffff10085f1276e dR10: ffffed0080c16369 R11: ffff88042f89dd04 R12: 00000023af3410aa dR13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000180 d ? irq_exit+0x10/0x1d0 d ? irq_exit+0x10/0x1d0 d <EOE> d <IRQ> d smp_call_function_single_interrupt+0x70/0x90 d call_function_single_interrupt+0x90/0xa0 dRIP: 0010:cpuidle_enter_state+0x121/0x7a0 dRSP: 0000:ffff88042caffe28 EFLAGS: 00000246c ORIG_RAX: ffffffffffffff04 dRAX: 0000000000000000 RBX: ffff88042f8ab720 RCX: 000000000000001f dRDX: 1ffff10085f142f9 RSI: 000000002dd33691 RDI: ffff88042f8a17c8 dRBP: ffff88042caffe88 R08: 0000000000000018 R09: ffffffff83f3f320 dR10: 071c71c71c71c71c R11: ffff88042f89dd04 R12: 00000023af3410aa dR13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000180 d <EOI> d ? cpuidle_enter_state+0x11c/0x7a0 d cpuidle_enter+0x17/0x20 d call_cpuidle+0x47/0xc0 d ? cpuidle_select+0x59/0x80 d cpu_startup_entry+0x1a6/0x2d0 d start_secondary+0x245/0x2d0 d start_cpu+0x5/0x14 3Memory state around the buggy address: 3 ffff88042f88ba80: f2 00 00 f4 f4 f2 f2 f2 f2 00 00 f4 f4 f3 f3 f3 3 ffff88042f88bb00: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3>ffff88042f88bb80: f1 f1 f1 f1 f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 f2 3 ^ 3 ffff88042f88bc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff88042f88bc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3================================================================== 4Disabling lock debugging due to kernel taint 3================================================================== 3BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x5fc/0x780 at addr ffff88042f88bb98 3Read of size 8 by task swapper/2/0 0page:ffffea0010be22c0 count:1 mapcount:0 mapping: (null) index:0x0c 0flags: 0x2ffff8000000400(reserved) 1page dumped because: kasan: bad access detected dCPU: 2 PID: 0 Comm: swapper/2 Tainted: G B 4.9.0-rc5-00530-gd8866fc-dirty #3 dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 dCall Trace: d <NMI> d dump_stack+0x67/0x94 d kasan_report_error+0x4a1/0x4d0 d ? kasan_report_error+0x420/0x4d0 d __asan_report_load8_noabort+0x43/0x50 d ? unwind_next_frame+0x5fc/0x780 d unwind_next_frame+0x5fc/0x780 d perf_callchain_kernel+0x341/0x550 d ? arch_perf_update_userpage+0x350/0x350 d ? __perf_event_header__init_id+0x500/0x500 d get_perf_callchain+0x276/0x670 d ? put_callchain_buffers+0x50/0x50 d ? sched_clock_cpu+0x11c/0x1a0 d perf_callchain+0x128/0x1a0 d perf_prepare_sample+0x70e/0xfb0 d perf_event_output_forward+0x93/0x110 d ? perf_prepare_sample+0xfb0/0xfb0 d ? arch_perf_update_userpage+0x26c/0x350 d ? sched_clock_cpu+0x11c/0x1a0 d __perf_event_overflow+0x1a3/0x570 d perf_event_overflow+0x14/0x20 d __intel_pmu_pebs_event+0x3ca/0x610 d ? pebs_update_state+0x310/0x310 d ? acpi_map_lookup+0x40/0xad d ? intel_pmu_disable_bts+0xc0/0xc0 d ? acpi_map_lookup+0x40/0xad d ? put_dec+0x1c/0xb0 d ? number+0x71c/0xa70 d ? put_dec+0xb0/0xb0 d intel_pmu_drain_pebs_nhm+0x5f6/0xbf0 d ? __intel_pmu_pebs_event+0x610/0x610 d ? early_serial_putc+0x41/0x70 d ? early_serial_write+0x7c/0xf0 d ? trace_raw_output_console+0x160/0x160 d intel_pmu_handle_irq+0x4b2/0xa90 d ? intel_pmu_save_and_restart+0xe0/0xe0 d ? acpi_os_read_memory+0x228/0x262 d ? acpi_os_get_timer+0x1a/0x1a d ? vunmap_page_range+0x269/0x400 d ? ghes_copy_tofrom_phys+0x149/0x270 d ? ghes_read_estatus+0x11e/0x6b0 d ? ghes_copy_tofrom_phys+0x270/0x270 d perf_event_nmi_handler+0x2d/0x50 d nmi_handle+0x9e/0x250 d default_do_nmi+0x111/0x180 d do_nmi+0x1a2/0x210 d end_repeat_nmi+0x1a/0x1e dRIP: 0010:irq_exit+0x10/0x1d0 dRSP: 0000:ffff88042f887fc8 EFLAGS: 00000046c dRAX: 0000000000000000 RBX: ffffffff83a77980 RCX: 1ffff10080965faf dRDX: 1ffff10085f13747 RSI: 0000000000000000 RDI: ffff88042f89ba38 dRBP: ffff88042f887fd0 R08: ffff8804060b1a08 R09: 1ffff10085f1276e dR10: ffffed0080c16369 R11: ffff88042f89dd04 R12: 00000023af3410aa dR13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000180 d ? irq_exit+0x10/0x1d0 d ? irq_exit+0x10/0x1d0 d <EOE> d <IRQ> d smp_call_function_single_interrupt+0x70/0x90 d call_function_single_interrupt+0x90/0xa0 dRIP: 0010:cpuidle_enter_state+0x121/0x7a0 dRSP: 0000:ffff88042caffe28 EFLAGS: 00000246c ORIG_RAX: ffffffffffffff04 dRAX: 0000000000000000 RBX: ffff88042f8ab720 RCX: 000000000000001f dRDX: 1ffff10085f142f9 RSI: 000000002dd33691 RDI: ffff88042f8a17c8 dRBP: ffff88042caffe88 R08: 0000000000000018 R09: ffffffff83f3f320 dR10: 071c71c71c71c71c R11: ffff88042f89dd04 R12: 00000023af3410aa dR13: 0000000000000004 R14: 0000000000000004 R15: 0000000000000180 d <EOI> d ? cpuidle_enter_state+0x11c/0x7a0 d cpuidle_enter+0x17/0x20 d call_cpuidle+0x47/0xc0 d ? cpuidle_select+0x59/0x80 d cpu_startup_entry+0x1a6/0x2d0 d start_secondary+0x245/0x2d0 d start_cpu+0x5/0x14 3Memory state around the buggy address: 3 ffff88042f88ba80: f2 00 00 f4 f4 f2 f2 f2 f2 00 00 f4 f4 f3 f3 f3 3 ffff88042f88bb00: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3>ffff88042f88bb80: f1 f1 f1 f1 f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 f2 3 ^ 3 ffff88042f88bc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff88042f88bc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3================================================================== ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-16 14:58 ` Peter Zijlstra @ 2016-11-17 4:48 ` Josh Poimboeuf 2016-11-17 9:04 ` Peter Zijlstra 0 siblings, 1 reply; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-17 4:48 UTC (permalink / raw) To: Peter Zijlstra Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Wed, Nov 16, 2016 at 03:58:49PM +0100, Peter Zijlstra wrote: > 3BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x1fb/0x220 at addr ffff88042f88bba0 So I dug through the disassembly (thanks for the vmlinux), and I'm pretty sure the stack-out-of-bounds address is on the NMI stack, in the kasan redzone in the stack frame of intel_pmu_handle_irq(). What's weird though is that perf_callchain_kernel() passes the pt_regs from the IRQ, not from the NMI. The unwinder should have started from the IRQ stack. But somehow it ended up unwinding to the middle of the NMI stack. So it seems like stack corruption in the IRQ or task stack, with a frame pointer that points back to the middle of the NMI stack for some reason. But then again, the kasan error report dumped the stack fine. So that would seem to rule out stack corruption... So I have no idea what's going on. I got perf_fuzzer running and tried to recreate, but no luck. Peter or Vince, can you try to recreate with this patch? It dumps the raw stack contents during a stack dump. Hopefully that would give a clue about what's going wrong. diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 499aa6f..67ff3ac 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -48,6 +48,30 @@ static void printk_stack_address(unsigned long address, int reliable, printk("%s %s%pB\n", log_lvl, reliable ? "" : "? ", (void *)address); } +static void raw_stack_dump(struct stack_info *info) +{ + unsigned long *s, word[4]; + int skip = 0; + + for (s = info->begin; s < info->end; s += 4) { + word[0] = READ_ONCE_NOCHECK(s[0]); + word[1] = READ_ONCE_NOCHECK(s[1]); + word[2] = READ_ONCE_NOCHECK(s[2]); + word[3] = READ_ONCE_NOCHECK(s[3]); + + if (!word[0] && !word[1] && !word[2] && !word[3]) { + if (!skip) + printk("%p: %016x ...\n", s, 0); + skip = 1; + continue; + } + + skip = 0; + printk("%p: %016lx %016lx %016lx %016lx\n", + s, word[0], word[1], word[2], word[3]); + } +} + void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, unsigned long *stack, char *log_lvl) { @@ -156,6 +180,8 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, if (str_end) printk("%s <%s>\n", log_lvl, str_end); + + raw_stack_dump(&stack_info); } } ^ permalink raw reply related [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 4:48 ` Josh Poimboeuf @ 2016-11-17 9:04 ` Peter Zijlstra 2016-11-17 9:13 ` Peter Zijlstra 2016-11-17 15:18 ` Josh Poimboeuf 0 siblings, 2 replies; 33+ messages in thread From: Peter Zijlstra @ 2016-11-17 9:04 UTC (permalink / raw) To: Josh Poimboeuf Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Wed, Nov 16, 2016 at 10:48:28PM -0600, Josh Poimboeuf wrote: > Peter or Vince, can you try to recreate with this patch? It dumps the > raw stack contents during a stack dump. Hopefully that would give a > clue about what's going wrong. Here goes... I'll do another run and get you the results of that as well. 3================================================================== 3BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x1fb/0x220 at addr ffff88042fc0baa0 3Read of size 8 by task perf_fuzzer/11689 0page:ffffea0010bf02c0 count:1 mapcount:0 mapping: (null) index:0x0c 0flags: 0x2ffff8000000400(reserved) 1page dumped because: kasan: bad access detected dCPU: 26 PID: 11689 Comm: perf_fuzzer Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #4 dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 dCall Trace: d <NMI> d dump_stack+0x67/0x94 d kasan_report_error+0x4a1/0x4d0 d __asan_report_load8_noabort+0x43/0x50 d ? unwind_get_return_address+0x1fb/0x220 d unwind_get_return_address+0x1fb/0x220 d perf_callchain_kernel+0x356/0x550 d ? arch_perf_update_userpage+0x350/0x350 d ? insn_get_opcode.part.4+0x3ac/0x910 d ? format_decode+0xf8/0x790 d ? format_decode+0xfa/0x790 d ? insn_get_modrm.part.5+0x52/0x5a0 d get_perf_callchain+0x276/0x670 d ? insn_get_sib.part.6+0x4a/0x250 d ? put_callchain_buffers+0x50/0x50 d ? sched_clock_cpu+0x11c/0x1a0 d ? format_decode+0xf8/0x790 d perf_callchain+0x128/0x1a0 d perf_prepare_sample+0x70e/0xfb0 d perf_event_output+0x93/0x110 d ? perf_event_output_backward+0x110/0x110 d ? setup_pebs_sample_data+0xd48/0x18e0 d __intel_pmu_pebs_event+0x2b1/0x610 d ? pebs_update_state+0x310/0x310 d ? early_vga_write+0x180/0x180 d ? intel_pmu_disable_bts+0xc0/0xc0 d ? early_vga_write+0x180/0x180 d ? insn_get_prefixes.part.2+0x36d/0xc70 d ? insn_get_opcode.part.4+0x3ac/0x910 d ? number+0x71c/0xa70 d ? insn_get_opcode+0x42/0x50 d ? branch_type+0x122/0x3a0 d ? put_dec+0xb0/0xb0 d ? knc_pmu_handle_irq+0x3a0/0x3a0 d intel_pmu_drain_pebs_nhm+0x5f6/0xbf0 d ? __intel_pmu_pebs_event+0x610/0x610 d ? early_serial_write+0x7c/0xf0 d intel_pmu_handle_irq+0x4b2/0xa90 d ? intel_pmu_save_and_restart+0xe0/0xe0 d ? acpi_os_read_memory+0x228/0x262 d ? acpi_os_get_timer+0x1a/0x1a d ? vunmap_page_range+0x269/0x400 d ? ghes_copy_tofrom_phys+0x149/0x270 d ? ghes_read_estatus+0x11e/0x6b0 d ? ghes_copy_tofrom_phys+0x270/0x270 d perf_event_nmi_handler+0x2d/0x50 d nmi_handle+0x9e/0x250 d default_do_nmi+0x111/0x180 d do_nmi+0x1a2/0x210 d end_repeat_nmi+0x1a/0x1e dRIP: 0010:ctx_sched_in+0x44e/0x15a0 dRSP: 0000:ffff88042e7d7a58 EFLAGS: 00000046c dRAX: 0000000000024660 RBX: dffffc0000000000 RCX: ffff88041b9a3d00 dRDX: 1ffff100e1dc6908 RSI: 1ffff10085f848e8 RDI: ffff88070ee34840 dRBP: ffff88042e7d7ac0 R08: 0000000000000000 R09: ffff88041b9a4598 dR10: ffffffff83d3e060 R11: 1ffff10085f826ec R12: ffff88070ee34400 dR13: 0000000000000000 R14: ffff88070ee34664 R15: ffff88042fc24660 d ? ctx_sched_in+0x44e/0x15a0 d ? ctx_sched_in+0x44e/0x15a0 d <EOE> ffff88042fc0a000: 0000000000000000 ... ffff88042fc0a5a0: 0000000000000000 0000000000000000 0000000000000000 ffff8804afc0a9a3 ffff88042fc0a5c0: ffff88042fc0a9ab 0000000000000060 1ffff10085f814c3 00000000ffffffff ffff88042fc0a5e0: 0020000000000000 0000000000000000 00000000fffffffd 0000000000000001 ffff88042fc0a600: 00000000000015a0 0000000000000010 ffff1060ffffff09 0000000041b58ab3 ffff88042fc0a620: ffff8804afc0aa0b ffff88042fc0aa13 0000000000000060 1ffff10085f814d0 ffff88042fc0a640: 00000000ffffffff 0020000000000000 0000000000000000 00000000fffffffd ffff88042fc0a660: 0000000000000001 00000000000015a0 ffffffff8348be10 ffff1060ffffff09 ffff88042fc0a680: 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 ffff88042fc0a758 ffff88042fc0a6a0: ffff880431356130 ffffffff823b7c54 ffff88042fc0a7b0 ffff88042fc0a7b8 ffff88042fc0a6c0: ffff88042fc0a7b0 ffff88042fc0a9a4 0000000000000001 ffffffff8348bec9 ffff88042fc0a6e0: ffff88042fc0aa13 0000000000000018 dffffc0000000000 ffff88042fc0a870 ffff88042fc0a700: ffff88042fc0a7c0 ffff88042fc0a7e8 ffffffff823b7c54 ffff88042fc0a818 ffff88042fc0a720: ffff88042fc0a820 ffff88042fc0a818 ffff88042fc0aa0c 1ffff10085f814ec ffff88042fc0a740: ffffed0085f81504 000000007fffffff ffff8804afc0aa0b ffffffff8348beca ffff88042fc0a760: 0000000041b58ab3 ffffffff83a405aa ffffffff823b6ef0 0000000000000000 ffff88042fc0a780: ffff1060ffffff09 ffffffff823b8d95 0000000041b58ab3 ffffffff839ff69c ffff88042fc0a7a0: ffffffff823b8d00 0000000000000000 0000000000000020 ffff88042fc0a838 ffff88042fc0a7c0: ffffed0085f814ff 1ffff10085f81515 ffff88042fc0a988 ffffffff814f6efe ffff88042fc0a7e0: ffffffffffffffff ffff88042fc0a890 ffffffff823b8d95 0000000041b58ab3 ffff88042fc0a800: ffffffff839ff69c ffffffff823b8d00 ffffffff838ad9d9 ffffffff00000020 ffff88042fc0a820: ffff88042fc0a8a0 ffff88042fc0a858 ffff88042fc0a8c8 ffff88042fc0aa00 ffff88042fc0a840: dffffc0000000000 ffff88042fc0a890 ffffffff813c861f ffffffff8348beca ffff88042fc0a860: 0000000000000000 000000000000044e 00000000000015a0 ffffffff838ad9d9 ffff88042fc0a880: ffffffff838ad9d9 ffff88042fc0aa00 ffff88042fc0a9b0 ffffffff813c883f ffff88042fc0a8a0: 000000000000000c 0000000041b58ab3 ffffffff83a0c758 ffffffff813c86d0 ffff88042fc0a8c0: ffffed0085f8151f 0000000000000000 ffff88042fc0aa88 ffff0a00ffffff05 ffff88042fc0a8e0: ffff88042fc0a9b1 ffff88042fc0aced ffff88042fc0a9b2 0000000000000000 ffff88042fc0a900: ffff88042fc0a958 000000000000044e 0000000000000000 0000000000000020 ffff88042fc0a920: 1ffff10085f8152f ffff0a00ffffff05 1ffff10085f8152f ffff88042fc0a998 ffff88042fc0a940: ffff0a00ffffff05 ffff88042fc0aa19 ffff88042fc0ad4e ffff88042fc0aa1a ffff88042fc0a960: 0000000000000000 ffff88042fc0a9c0 ffffffff823adbcd 0000000041b58ab3 ffff88042fc0a980: ffffffff83a40559 1ffff10085f8153c ffff0a00ffffff05 1ffff10085f8153c ffff88042fc0a9a0: ffff88042fc0aa00 ffff88042fc0ad35 ffff88042fc0af30 ffff0a00ffffff05 ffff88042fc0a9c0: ffff88042fc0ab48 ffffffff823af620 0000000000000000 0000000000000000 ffff88042fc0a9e0: 0000000041b58ab3 ffffffff83a40559 ffffffff823af530 0000000000000000 ffff88042fc0aa00: 656863735f787463 3478302b6e695f64 61353178302f6534 303578302f000030 ffff88042fc0aa20: 0000300030650000 0000000000000000 0000000000000000 0000000000000000 ffff88042fc0aa40: ffff0a00ffffff05 ffff88042fc0ab25 ffff88042fc0ae7a ffff88042fc0ab26 ffff88042fc0aa60: ffff88042fc0af30 ffff88042fc0ad30 ffffffff823adb30 1ffff10085f81558 ffff88042fc0aa80: 00000000ffffffff 0020f10085f8155c ffff0a00ffffff00 1ffff10000000010 ffff88042fc0aaa0: ffff88042fc0ab00 ffff88042fc0aa80 ffff88042fc0b010 ffff103000001005 ffff88042fc0aac0: 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 ffffffffffffffff ffff88042fc0aae0: 3266633061616330 6666666638383034 ffffffff00000010 0000000000000000 ffff88042fc0ab00: ffff88042fc24660 ffff88042fc0af10 ffff103000001009 0000000041b58ab3 ffff88042fc0ab20: ffff88042fc0af30 ffff88042fc0ad75 ffff88042fc0ad30 1ffff10085f81570 ffff88042fc0ab40: ffffffffffffffff 002088042fc0ac08 ffffffff823b6600 ffffffff00000010 ffff88042fc0ab60: ffff88042fc0ad00 ffffffff00000010 ffff88042fc0ad10 ffff103000001009 ffff88042fc0ab80: 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 ffffffff839f498b ffff88042fc0aba0: 3833396634393862 6666666666666666 ffff88042fc0ac87 ffff88042fc0ac08 ffff88042fc0abc0: ffffffff823ad785 ffff88042fc0acc8 0000000000000001 ffff88042fc0ad85 ffff88042fc0abe0: ffff88042fc0ac08 ffffffff816213e5 ffff88042fc0ad85 ffffffff839f498f ffff88042fc0ac00: dffffc0000000000 ffff88042fc0ace8 ffffffff823b72eb ffff88042fc0b028 ffff88042fc0ac20: ffff88042fc0b030 ffffffff839f4990 ffff88042fc0ad30 1ffff10085f8158c ffff88042fc0ac40: ffffed0085f81606 0000000000000200 ffff88042fc0af30 0000000000000001 ffff88042fc0ac60: 0000000041b58ab3 ffffffff83a405aa ffffffff823b6ef0 ffff88042fc0acc8 ffff88042fc0ac80: ffff103000001000 1ffff10085f81595 ffffffff83c88b40 ffff88042fc0af10 ffff88042fc0aca0: ffffffff81338af4 0000000041b58ab3 ffff88042fc0acd0 ffffffff811c0a51 ffff88042fc0acc0: ffff88042fc0ad86 dffffc0000000000 ffff88042fc0ad00 ffffffff811c0afc ffff88042fc0ace0: ffff88042fc0ad30 00000000ffffffff 1ffff10085f815a2 ffffffff83c88b40 ffff88042fc0ad00: ffff88042fc0af78 ffffffff81338af4 0000000041b58ab3 ffffffff83a03c41 ffff88042fc0ad20: ffffffff81338a00 ffff0a00ffffff00 3430383866666666 3030646130636632 ffff88042fc0ad40: 666666666666203a 6138333331386666 3066666666203030 6666666666303061 ffff88042fc0ad60: 3636303320363636 3032363636363636 3636362030333033 3336363636363636 ffff88042fc0ad80: 1f000a3633363336 ffffffff83c88b40 ffff88042fc0b008 ffffffff81338af4 ffff88042fc0ada0: 0000000041b58ab3 ffffffff83a03c41 ffffffff81338a00 0000000041b58ab3 ffff88042fc0adc0: 6177647261486401 3a656d616e206572 43206c65746e4920 697461726f70726f ffff88042fc0ade0: 3030363253206e6f 30303632532f5a47 534f4942202c5a47 3030364335455320 ffff88042fc0ae00: 2e32302e4236382e 2e323030302e3230 3331303233323231 2f32312030313231 ffff88042fc0ae20: 0a333130322f3332 3d3d3d3d3d3d3d00 6f20646165523301 3820657a69732066 ffff88042fc0ae40: 6b73617420796220 75665f6672657020 3631312f72657a7a 5f746567000a3938 ffff88042fc0ae60: 615f6e7275746572 302b737365726464 3278302f62663178 6461207461203032 ffff88042fc0ae80: 3866666666207264 6230636632343038 000000000a306161 1ffff10085f815d7 ffff88042fc0aea0: ffffffff83c88b40 ffff88042fc0b120 ffffffff81338af4 0000000041b58ab3 ffff88042fc0aec0: ffffffff83a03c41 ffffffff81338a00 0000000000000000 4e494e5241573401 ffff88042fc0aee0: 6365726e75203a47 00000000ffffffff 0000000000000000 ffff88042fc0bef8 ffff88042fc0af00: ffffffff8342d740 ffff88042fc0afc0 ffff88042fc0af90 ffffffff8133c807 ffff88042fc0af20: 3430383866666666 3861636230636632 66726570206e6920 3a72657a7a75665f ffff88042fc0af40: 00000a3938363131 0000000000000000 00000000ffffffff 0000000000000000 ffff88042fc0af60: ffff88042fc0bef8 ffffffff839f4970 ffff88042fc0b028 ffff88042fc0aff8 ffff88042fc0af80: ffffffff8133c807 0000000000000000 ffff88042fc0b040 ffffffff8151fea9 ffff88042fc0afa0: 0000000041b58ab3 ffffffff839ff69c ffffffff8151fdf3 0000000000000000 ffff88042fc0afc0: 0000000000000000 000000002fc0b050 1ffff10085f81601 0000000000000000 ffff88042fc0afe0: ffff88042fc0bef8 ffff88041b9a3d00 ffff88042fc0c000 ffff88042fc0b0a8 ffff88042fc0b000: ffffffff8151fea9 0000000041b58ab3 ffffffff839ff69c ffffffff8151fdf3 ffff88042fc0b020: ffff88042fc0b110 ffff880400000030 ffff88042fc0b0b8 ffff88042fc0b068 ffff88042fc0b040: ffff88042fc0bef8 ffff88041b9a3d00 ffff88042fc0bff8 ffff88042fc0b080 ffff88042fc0b060: ffffffff813b9d58 0000000000000000 ffff88042fc0b040 ffff88042fc0bef8 ffff88042fc0b080: 0000000000000000 ffff88042fc0b040 ffff88042fc0bef8 ffff88042fc0b060 ffff88042fc0b0a0: 0000000000000009 ffff88042fc0b178 ffffffff811504e6 ffffffff814f6efe ffff88042fc0b0c0: ffffffff839fbd23 000000002fc0b0f8 0000000000000020 ffffffff839fbd5b ffff88042fc0b0e0: ffffffff839fbd1f 0000000000000005 ffff88042fc0a000 ffff88042fc0c000 ffff88042fc0b100: ffff88042e7d7a58 0000000000000001 ffff88042e7d0000 ffff88042e7d8000 ffff88042fc0b120: 0000000000000000 0000000000000022 ffff88041b9a3d00 0000000000000000 ffff88042fc0b140: ffff88042e7d7ac0 0000000000000000 0000000000000086 0000000000000000 ffff88042fc0b160: ffff88042fc0b420 ffffed0085f81685 dffffc0000000000 ffff88042fc0b188 ffff88042fc0b180: ffffffff811505c4 ffff88042fc0b1a8 ffffffff8238dfb3 ffff88042fc0b238 ffff88042fc0b1a0: ffff88042fc0baa0 ffff88042fc0b228 ffffffff816221c1 ffffffff839ff69c ffff88042fc0b1c0: ffff88042fc0b2c0 ffff88042fc0b2b8 0000000000000097 0000000000000001 ffff88042fc0b1e0: 00000000000000c0 ffff88042fc0bef8 ffff88042fc0b9d8 ffff88042fc0bef8 ffff88042fc0b200: ffff88042fc0b310 ffff88042fc0baa0 ffff88042fc0b420 ffffed0085f81685 ffff88042fc0b220: dffffc0000000000 ffff88042fc0b260 ffffffff81622323 ffff88042fc0baa0 ffff88042fc0b240: ffff88042fc0baa0 0000000000000008 ffff88042fc0b200 ffffffff811c72cb ffff88042fc0b260: ffff88042fc0b2a0 ffffffff811c72cb ffff88042fc0b320 ffff88042fc0b310 ffff88042fc0b280: ffff88042fc0b310 ffff88042fc0b390 ffff88042fc0b420 ffffed0085f81685 ffff88042fc0b2a0: ffff88042fc0b3b8 ffffffff8100f356 ffff880710753b80 ffff88042fc0b5b0 ffff88042fc0b2c0: 0000000041b58ab3 ffff88042fc0b42c 1ffff10085f8165e ffff88042fc0b432 ffff88042fc0b2e0: 0000000000000004 ffff88042fc0b428 0000000041b58ab3 ffffffff839f613c ffff88042fc0b300: ffffffff8100f000 ffffffff823bbf3c 0000000000000005 ffff88042fc0a000 ffff88042fc0b320: ffff88042fc0c000 ffff88042e7d7a58 0000000000000020 ffff88041b9a3d00 ffff88042fc0b340: 0000000000000000 ffff88042fc0ba98 0000000000000000 ffff88042fc0b4e8 ffff88042fc0b360: ffff88042fc0b536 ffffffff823ad258 0000000000000002 ffffffff823ad25a ffff88042fc0b380: ffff88042fc0b3c0 ffffffff823bc4f2 000000000001bdc0 ffff88042fc0b460 ffff88042fc0b3a0: ffff880407f9adc0 1ffff10085f81680 ffff880407f9adc0 ffff88042fc0b488 ffff88042fc0b3c0: ffffffff81513f16 ffffffff823bca8a ffff88042fc0b4e8 ffff880400000000 ffff88042fc0b3e0: ffff88042fc0b6e0 ffff880400000000 ffffffff00000001 000000000000000c ffff88042fc0b400: 0000000041b58ab3 ffffffff83a0a369 ffffffff81513ca0 ffff880710753b80 ffff88042fc0b420: ffff880407f9adc0 000000010000007f ffff88042f000001 ffffffff812c58ec ffff88042fc0b440: ffff88042fc0b536 ffffffff823ad258 0000000000000002 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perf_sched_cb_inc+0x190/0x190 d finish_task_switch+0x347/0x570 d __schedule+0x69c/0x1760 d ? __send_signal+0x7ff/0xea0 d ? io_schedule_timeout+0x3a0/0x3a0 d ? release_task+0x1230/0x1230 d ? send_signal+0x5f/0xb0 d ? do_send_sig_info+0xc9/0x120 d schedule+0x94/0x1b0 d do_wait+0x5b2/0x710 d ? wait_consider_task+0x3580/0x3580 d ? syscall_exit_register+0x4f0/0x4f0 d ? SYSC_kill+0x1a3/0x450 d SyS_wait4+0xd3/0x170 d ? SyS_waitid+0x1d0/0x1d0 d ? task_stopped_code+0x100/0x100 d ? syscall_slow_exit_work+0x138/0x1e0 d ? 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ffffffff8101a831 0000000300000005 0000000000000004 ffff88042fc13b60 ffff88042e7d76c0: 0000000000000005 0000000000000021 0000000000000002 0000000200000003 ffff88042e7d76e0: 0000000000000000 ... ffff88042e7d7720: ffff88042e7d7770 ffffffff8101c610 0000000000000001 ffff880700000002 ffff88042e7d7740: ffff880700000000 0000000000000001 ffff88042e7d7770 ffffffff810191fa ffff88042e7d7760: dffffc0000000000 ffff88042e7d789c ffff88042e7d7858 ffffffff8100cac2 ffff88042e7d7780: ffff880710753b80 ffff880708c8f700 1ffffffff082adc1 0000000000029ffe ffff88042e7d77a0: 1ffff10085cfaefa ffff88042fc13b60 ffff880700000003 ffff880400000000 ffff88042e7d77c0: ffff88042e7d7890 ffff88042fc13440 0000000041b58ab3 ffffffff839f6109 ffff88042e7d77e0: ffffffff8100c720 ffff88042fc13440 0000000200000000 ffffffff81009e18 ffff88042e7d7800: 0000000241b58ab3 0000000041b58ab3 ffffffff839f60e8 ffffffff81009c50 ffff88042e7d7820: 000000000000000c ffff88042fc13660 ffff88042e7d7858 ffffffff816213e5 ffff88042e7d7840: ffff88042fc13440 ffff88042fc13440 1ffff10085cfaf0e ffff88042e7d79d8 ffff88042e7d7860: ffffffff81009b68 ffffffff83c167c0 0000000041b58ab3 ffffffff839f60e8 ffff88042e7d7880: ffffffff810099d0 0000000000000000 0000000000000021 ffff880400000001 ffff88042e7d78a0: ffffffff8116dfd3 00000000e587263b 0000000000000078 ffff88042e7d7948 ffff88042e7d78c0: ffff880422a6e860 ffff88042e7d7920 ffffffff8242fc8f 0000000002280020 ffff88042e7d78e0: ffff88042e7d7930 000000000007263b 0000000000000000 ffff8807238e5500 ffff88042e7d7900: ffff880704d2d000 ffff8807238e56c8 ffff88042e7d7960 ffff8804274b0000 ffff88042e7d7920: ffff88042e7d7960 ffffffff8100ef1c ffff88071eebe768 ffff8807238e5500 ffff88042e7d7940: ffff880704d2d000 ffff8807238e56c0 ffff88042e7d79a0 ffff8804274b0000 ffff88042e7d7960: ffff88042e7d79a0 ffffffff8100ef1c ffff88042e7d79d8 ffff8807238e5500 ffff88042e7d7980: ffff8804274b0000 00000000023a9a15 ffff8807238e5500 ffff8804274b0000 ffff88042e7d79a0: ffff88042e7d7a00 ffffffff814ffc80 0000000000000000 ffff8807238e5578 ffff88042e7d79c0: 00000000b446421f 00000000b20bdf59 0000002a5b4a1cfa ffff88042fc13648 ffff88042e7d79e0: 0000000000000004 ffff880701d95900 0000000000000006 ffff88042e7d7a48 ffff88042e7d7a00: ffffffff812c58ec ffff88042e7d7a28 ffffffff8101d12c ffff8807238e5500 ffff88042e7d7a20: 0000000000000004 ffff880701d95900 0000000000000006 ffff88042fc24660 ffff88042e7d7a40: ffff880701d95978 ffff88042e7d7ac0 ffffffff814f798b ffffffff812c58ec ffff88042e7d7a60: ffff88072f324660 ffff880701d95900 ffffed0085f848e9 ffff88042fc2474c ffff88042e7d7a80: ffff880400000001 ffff88042fc24660 ffff880701d95950 ffff88042fc24660 ffff88042e7d7aa0: ffff88041b9a3d00 ffff880701d95900 ffff88041b9a3d00 1ffff10085cfaf67 ffff88042e7d7ac0: ffff88042e7d7ae8 ffffffff814f80b0 ffff88041b9a4590 ffff880701d95900 ffff88042e7d7ae0: ffff88042e7d7b98 ffff88042e7d7bc0 ffffffff814fe321 ffff88041b9a3d00 ffff88042e7d7b00: ffff880701d95900 ffff88041b9a4598 dffffc0000000000 ffff88042fc24660 ffff88042e7d7b20: ffff880701d95908 ffff88042fc24668 ffff88042cb9bd00 0000000041b58ab3 ffff88042e7d7b40: ffffffff83a0a0e1 ffffffff814fdfa0 ffff88041b9a3d00 ffff88072f3216d8 ffff88042e7d7b60: ffff88041b9a4598 ffff88072c684590 dffffc0000000000 ffff88041b9a4840 ffff88042e7d7b80: 1ffff10085cfaf71 0000000041b58ab3 ffffffff839fba92 ffff88041b9a3d00 ffff88042e7d7ba0: ffff88042fc20d80 ffff88042cb9bd00 ffff880700b1cc80 ffff88041b9a4118 ffff88042e7d7bc0: ffff88042e7d7c10 ffffffff812a5e77 0000000000000000 ffff88072f320d80 ffff88042e7d7be0: 0000000000000000 ffff88072f320d80 ffff88041b9a3d00 ffff88072c683d00 ffff88042e7d7c00: ffff88071570c800 ffff88041b9a4118 ffff88042e7d7d28 ffffffff8329e69c ffff88042e7d7c20: ffff88042e7d7c98 ffffffff8125a75f ffff88071d4cb408 ffff88072f321608 ffff88042e7d7c40: 1ffff10085cfaf8c 000000001b26d110 ffff88072f321630 ffff88041b9a42d0 ffff88042e7d7c60: 0000000041b58ab3 ffffffff83a0af50 ffffffff8329e000 1ffff10085cfaf90 ffff88042e7d7c80: 0000000041b58ab3 ffffffff83a0a700 ffffffff81239600 ffff88042e7d7cc8 ffff88042e7d7ca0: ffffffff8125ae5f 000000011d4cadc0 0000000000000286 1ffff10085cfaf9c ffff88042e7d7cc0: ffff88071d4cadc0 ffff88042e7d7d68 ffffffff8125ca69 ffff880700000001 ffff88042e7d7ce0: 0000000041b58ab3 ffffffff83a001ed 0000000000000246 ffff88042e7d7e78 ffff88042e7d7d00: ffffed00837347a0 ffff88041b9a3d00 ffff88041b9a4200 ffff88041b9a3d00 ffff88042e7d7d20: ffff88041b9a3cf0 ffff88042e7d7d48 ffffffff8329f7f4 dffffc0000000000 ffff88042e7d7d40: ffff88042e7d7e50 ffff88042e7d7e18 ffffffff8123d132 1ffff10085cfafb2 ffff88042e7d7d60: ffffed00837347a0 ffff88041b9a3d00 ffff88042e7d7e78 ffff88042e7d7ea0 ffff88042e7d7d80: ffffed0085cfafca ffff88042e7d7e54 0000000041b58ab3 ffffffff839ff9ee ffff88042e7d7da0: ffffffff8123cb80 ffffffff814a7730 0000000000000000 ffff88042e7d7ec0 ffff88042e7d7dc0: 0000000000000000 ffff88042e7d7ee8 ffffffff8125d8c3 ffff88041fbef780 ffff88042e7d7de0: ffff880727608c80 0000000000000000 ffff88042e7d7ed0 1ffff10085cfafc6 ffff88042e7d7e00: 0000000000000000 0000000000000000 ffff880727608c80 ffff88042e7d7ef8 ffff88042e7d7e20: ffffffff812409d3 00007fff4ff89d6c 0000000041b58ab3 ffffffff839ffa10 ffff88042e7d7e40: ffffffff81240900 000000000000003d 0000000400000000 ffff880727608c80 ffff88042e7d7e60: 0000000000000000 00007fff4ff89d6c 0000000000000000 ffffffff00000000 ffff88042e7d7e80: ffff88041b9a3d00 ffffffff81237f10 ffff880429da68a8 ffff880429da68a8 ffff88042e7d7ea0: ffffffff00000000 ffff88042e7d7f58 dffffc0000000000 ffff88042e7d7ef8 ffff88042e7d7ec0: ffffffff81004388 0000000000000000 ffff88042e7d7f58 ffffffff81240900 ffff88042e7d7ee0: ffff88041b9a3d00 0000000000000000 0000000000000000 ffff88042e7d7f48 ffff88042e7d7f00: ffffffff8100540f 0000000000000006 ffffed00e4f1da71 ffff88071b26d100 ffff88042e7d7f20: 0000000000000000 1ffff10085cfaff5 0000000000000000 0000000000401810 ffff88042e7d7f40: 00007fff4ff8c0f0 00007fff4ff89d70 ffffffff832abcdf 0000000000000000 ffff88042e7d7f60: 0000000000000000 00007fff4ff8c0f0 0000000000401810 00007fff4ff89d70 ffff88042e7d7f80: 0000000000000000 0000000000000246 0000000000000000 00007f614f23c120 ffff88042e7d7fa0: 00007f614f23c0a4 ffffffffffffffda 00007f614ef57afa 0000000000000000 ffff88042e7d7fc0: 00007fff4ff89d6c 0000000000003176 000000000000003d 00007f614ef57afa ffff88042e7d7fe0: 0000000000000033 0000000000000246 00007fff4ff89d58 000000000000002b 3Memory state around the buggy address: 3 ffff88042fc0b980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff88042fc0ba00: 00 00 00 00 00 f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 3>ffff88042fc0ba80: f2 00 00 f4 f4 f2 f2 f2 f2 00 00 f4 f4 f3 f3 f3 3 ^ 3 ffff88042fc0bb00: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff88042fc0bb80: f1 f1 f1 f1 f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 f2 3================================================================== ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 9:04 ` Peter Zijlstra @ 2016-11-17 9:13 ` Peter Zijlstra 2016-11-17 9:30 ` Peter Zijlstra 2016-11-17 15:18 ` Josh Poimboeuf 1 sibling, 1 reply; 33+ messages in thread From: Peter Zijlstra @ 2016-11-17 9:13 UTC (permalink / raw) To: Josh Poimboeuf Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Thu, Nov 17, 2016 at 10:04:46AM +0100, Peter Zijlstra wrote: > On Wed, Nov 16, 2016 at 10:48:28PM -0600, Josh Poimboeuf wrote: > > Peter or Vince, can you try to recreate with this patch? It dumps the > > raw stack contents during a stack dump. Hopefully that would give a > > clue about what's going wrong. > > > Here goes... I'll do another run and get you the results of that as > well. This one is funny, I've not seen that WARNING before. Let me do a third run. 4WARNING: unrecognized kernel stack return address ffff88072f20bef8 at ffff88072f20bdd0 in swapper/10:0 3================================================================== 3BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x1fb/0x220 at addr ffff88072f20bda8 3Read of size 8 by task swapper/10/0 0page:ffffea001cbc82c0 count:1 mapcount:0 mapping: (null) index:0x0c 0flags: 0x6ffff8000000400(reserved) 1page dumped because: kasan: bad access detected dCPU: 10 PID: 0 Comm: swapper/10 Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #4 dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 dCall Trace: d <NMI> d dump_stack+0x67/0x94 d kasan_report_error+0x4a1/0x4d0 d ? unwind_get_return_address+0x1fb/0x220 d ? kasan_report_error+0x5/0x4d0 d __asan_report_load8_noabort+0x43/0x50 d ? unwind_get_return_address+0x130/0x220 d ? unwind_get_return_address+0x1fb/0x220 d unwind_get_return_address+0x1fb/0x220 d perf_callchain_kernel+0x356/0x550 d ? arch_perf_update_userpage+0x350/0x350 d ? ftrace_ops_list_func+0x252/0x370 d ? perf_callchain_kernel+0x5/0x550 d ? perf_callchain+0x128/0x1a0 d get_perf_callchain+0x276/0x670 d ? put_callchain_buffers+0x50/0x50 d ? get_perf_callchain+0x5/0x670 d ? rcu_is_watching+0x30/0x70 d perf_callchain+0x128/0x1a0 d ? setup_pebs_sample_data+0xd48/0x18e0 d perf_prepare_sample+0x70e/0xfb0 d ? __rcu_read_lock+0x5/0x50 d perf_event_output+0x93/0x110 d ? perf_event_output_backward+0x110/0x110 d ? setup_pebs_sample_data+0xd48/0x18e0 d __intel_pmu_pebs_event+0x2b1/0x610 d ? pebs_update_state+0x310/0x310 d ? perf_cgroup_attach+0xb0/0xb0 d ? ctx_resched+0x1a0/0x1a0 d ? rcu_is_watching+0x30/0x70 d ? intel_pmu_disable_bts+0xc0/0xc0 d ? rcu_is_watching+0x30/0x70 d ? ftrace_ops_list_func+0x252/0x370 d ? intel_pmu_drain_pebs_nhm+0x5f6/0xbf0 d ? ftrace_call+0x5/0x34 d ? __intel_pmu_pebs_event+0x5/0x610 d intel_pmu_drain_pebs_nhm+0x5f6/0xbf0 d ? __intel_pmu_pebs_event+0x610/0x610 d ? ftrace_call+0x5/0x34 d ? intel_pmu_drain_pebs_nhm+0x5/0xbf0 d intel_pmu_handle_irq+0x4b2/0xa90 d ? intel_pmu_save_and_restart+0xe0/0xe0 d ? ftrace_ops_list_func+0x252/0x370 d ? perf_event_nmi_handler+0x2d/0x50 d ? ftrace_call+0x5/0x34 d ? ftrace_call+0x5/0x34 d ? ftrace_ops_list_func+0x252/0x370 d ? intel_pmu_handle_irq+0x5/0xa90 d ? perf_event_nmi_handler+0x5/0x50 d perf_event_nmi_handler+0x2d/0x50 d nmi_handle+0x9e/0x250 d ? nmi_handle+0x5/0x250 d default_do_nmi+0x67/0x180 d do_nmi+0x1a2/0x210 d ? ctx_resched+0x1a0/0x1a0 d ? perf_cgroup_attach+0xb0/0xb0 d end_repeat_nmi+0x1a/0x1e dRIP: 0010:remote_function+0x113/0x180 dRSP: 0018:ffff88072f207f60 EFLAGS: 00000806c dRAX: 0000000000000000 RBX: ffff880421affd60 RCX: 1ffff1008435ffaf dRDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88072f224f10 dRBP: ffff88072f207f80 R08: 00000000000004c1 R09: ffffed00e5e426ca dR10: 00000000ffffffff R11: 1ffff100e5e426ec R12: ffffffff814f8270 dR13: ffff880421affd78 R14: ffff880421affcc0 R15: ffffffff814e6a70 d ? perf_cgroup_attach+0xb0/0xb0 d ? ctx_resched+0x1a0/0x1a0 d ? remote_function+0x113/0x180 d ? remote_function+0x113/0x180 d <EOE> ffff88072f20a000: 0000000000000000 ... ffff88072f20a5a0: 0000000000000000 0000000000000000 0000000000000000 ffff8807af20a9a6 ffff88072f20a5c0: ffff88072f20a9ae 0000000000000060 1ffff100e5e414c3 00000000ffffffff ffff88072f20a5e0: 0020000000000000 0000000000000000 00000000fffffffd 0000000000000001 ffff88072f20a600: 0000000000000180 0000000000000010 ffff1060ffffff09 0000000041b58ab3 ffff88072f20a620: ffff8807af20aa0e ffff88072f20aa16 0000000000000060 1ffff100e5e414d0 ffff88072f20a640: 00000000ffffffff 0020000000000000 0000000000000000 00000000fffffffd ffff88072f20a660: 0000000000000001 0000000000000180 ffffffff8348be10 ffff1060ffffff09 ffff88072f20a680: 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 ffff88072f20a758 ffff88072f20a6a0: ffff88072f313830 ffffffff823b7c54 ffff88072f20a7b0 ffff88072f20a7b8 ffff88072f20a6c0: ffff88072f20a7b0 ffff88072f20a9a7 0000000000000001 ffffffff8348bec9 ffff88072f20a6e0: ffff88072f20aa16 0000000000000018 dffffc0000000000 ffff88072f20a870 ffff88072f20a700: ffff88072f20a7c0 ffff88072f20a7e8 ffffffff823b7c54 ffff88072f20a818 ffff88072f20a720: ffff88072f20a820 ffff88072f20a818 ffff88072f20aa0f 1ffff100e5e414ec ffff88072f20a740: ffffed00e5e41504 000000007fffffff ffff8807af20aa0e ffffffff8348beca ffff88072f20a760: 0000000041b58ab3 ffffffff83a405aa ffffffff823b6ef0 ffff880402cb94a8 ffff88072f20a780: ffff1060ffffff09 ffff88072f20aa00 1ffff100e5e41515 ffff88072f20a890 ffff88072f20a7a0: ffffffff814e6b83 ffffffffffffffff ffff88072f20a868 fffffbfff07121c8 ffff88072f20a7c0: ffffed00e5e414ff 1ffff100e5e41515 ffff88072f20a988 ffffffff814e6b83 ffff88072f20a7e0: ffffffffffffffff ffff88072f20a890 ffffffff823b8d95 0000000041b58ab3 ffff88072f20a800: ffffffff839ff69c ffffffff823b8d00 ffffed00e5e41515 ffff880700000020 ffff88072f20a820: ffff88072f20a8a0 ffff88072f20a858 ffff88072f20a8c8 ffff88072f20aa00 ffff88072f20a840: dffffc0000000000 ffff88072f20a890 ffffffff813c861f ffff88072f20aec8 ffff88072f20a860: 0000000000000000 0000000000000113 0000000000000180 ffffffff838ad5e6 ffff88072f20a880: ffffffff838ad5e6 ffff88072f20aa00 ffff88072f20a9b0 ffffffff813c883f ffff88072f20a8a0: 000000000000000f 0000000041b58ab3 ffffffff83a0c758 ffffffff813c86d0 ffff88072f20a8c0: ffff88072f20af30 0000000000000000 ffff88072f20a988 ffffffff832ad2e7 ffff88072f20a8e0: ffff88072f20a998 ffffffff832ad2e7 ffff88072f20a9b4 0000000000000000 ffff88072f20a900: ffff88072f20a9c0 0000000000000113 ffff88072f20ab48 ffff880700000020 ffff88072f20a920: 0000000000000000 ffffffff839fbe88 0000000000000042 0000000000000001 ffff88072f20a940: ffff0a00ffffff05 ffff88072f20aa1b ffff88072f20ad50 ffff88072f20aa1c ffff88072f20a960: 0000000000000000 ffff88072f20a9c0 ffffffff823adbcd 0000000041b58ab3 ffff88072f20a980: ffffffff83a40559 1ffff100e5e4153c ffff0a00ffffff05 1ffff100e5e4153c ffff88072f20a9a0: ffff88072f20aa00 ffff88072f20ad35 ffff88072f20af30 ffff0a00ffffff05 ffff88072f20a9c0: ffff88072f20ab48 ffffffff823af620 ffff88072f20aa88 ffffffff832ad2e7 ffff88072f20a9e0: 0000000041b58ab3 ffffffff83a40559 ffffffff823af530 0000000000000000 ffff88072f20aa00: 665f65746f6d6572 2b6e6f6974636e75 78302f3331317830 3035780000303831 ffff88072f20aa20: 0000300030657800 ffffffff83a13036 0000000000000053 0000000000000001 ffff88072f20aa40: ffff0a00ffffff05 ffff88072f20ab25 ffff88072f20ae7a ffff88072f20ab26 ffff88072f20aa60: ffff88072f20af30 ffff88072f20ad30 ffffffff823adb30 1ffff100e5e41558 ffff88072f20aa80: 00000000ffffffff 0020f100e5e4155c ffff0a00ffffff00 1ffff10000000010 ffff88072f20aaa0: ffff88072f20ab00 ffff88072f20aa80 ffff88072f20b010 ffff103000001005 ffff88072f20aac0: 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 ffffffffffffffff ffff88072f20aae0: 3266323061616330 6666666638383037 ffffffff00000010 0000000000000000 ffff88072f20ab00: ffffffff814e6a70 ffff88072f20af10 ffff103000001009 0000000041b58ab3 ffff88072f20ab20: ffff88072f20af30 ffff88072f20ad75 ffff88072f20ad30 1ffff100e5e41570 ffff88072f20ab40: ffffffffffffffff 002088072f20ac08 ffffffff823b6600 ffffffff00000010 ffff88072f20ab60: ffff88072f20ad00 ffffffff00000010 ffff88072f20ad10 ffff103000001009 ffff88072f20ab80: 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 ffffffff839f498b ffff88072f20aba0: 3833396634393862 6666666666666666 ffff88072f20ac87 ffff88072f20ac08 ffff88072f20abc0: ffffffff823ad785 ffff88072f20acc8 0000000000000001 ffff88072f20ad85 ffff88072f20abe0: ffff88072f20ac08 ffffffff816213e5 ffff88072f20ad85 ffffffff839f498f ffff88072f20ac00: dffffc0000000000 ffff88072f20ace8 ffffffff823b72eb ffff88072f20b028 ffff88072f20ac20: ffff88072f20b030 ffffffff839f4990 ffff88072f20ad30 1ffff100e5e4158c ffff88072f20ac40: ffffed00e5e41606 0000000000000200 ffff88072f20af30 0000000000000001 ffff88072f20ac60: 0000000041b58ab3 ffffffff83a405aa ffffffff823b6ef0 ffff88072f20acc8 ffff88072f20ac80: ffff103000001000 1ffff100e5e41595 ffffffff83c88b40 ffff88072f20af10 ffff88072f20aca0: ffffffff81338af4 0000000041b58ab3 ffff88072f20acd0 ffffffff811c0a51 ffff88072f20acc0: ffff88072f20ad86 dffffc0000000000 ffff88072f20ad00 ffffffff811c0afc ffff88072f20ace0: ffff88072f20ad30 00000000ffffffff 1ffff100e5e415a2 ffffffff83c88b40 ffff88072f20ad00: ffff88072f20af78 ffffffff81338af4 0000000041b58ab3 ffffffff83a03c41 ffff88072f20ad20: ffffffff81338a00 ffff0a00ffffff00 3730383866666666 3030646130326632 ffff88072f20ad40: 666666666666203a 6138333331386666 3066666666203030 6666666666303061 ffff88072f20ad60: 3636303320363636 3032363636363636 3636362030333033 3336363636363636 ffff88072f20ad80: 1f000a3633363336 ffffffff83c88b40 ffff88072f20b008 ffffffff81338af4 ffff88072f20ada0: 0000000041b58ab3 ffffffff83a03c41 ffffffff81338a00 0000000041b58ab3 ffff88072f20adc0: 6177647261486401 3a656d616e206572 43206c65746e4920 ffff880402cb9498 ffff88072f20ade0: ffff88072f20ae30 ffffffff81448fa2 534f4942202c5a47 ffff880402cb94a8 ffff88072f20ae00: ffffffff8133c807 00000000ffffffff 0000000000000000 ffff88072f20bef8 ffff88072f20ae20: ffffffff8342d740 ffff88072f20afc0 ffff88072f20aee8 ffffffff832ad2e7 ffff88072f20ae40: ffff880402cb9498 ffff88072f20ae98 ffffffff81448fa2 ffff880402cb9498 ffff88072f20ae60: ffff880402cb94a8 ffffffff8133c807 00000000ffffffff 0000000000000018 ffff88072f20ae80: ffff88072f20bef8 ffffffff839f4970 ffff88072f20b028 ffff88072f20af50 ffff88072f20aea0: ffffffff832ad2e7 ffffffff81448fa2 ffffffff8342d740 ffff880402cb94a8 ffff88072f20aec0: ffff880402cb9498 ffff88072f20aff8 ffffffff81448fa2 ffff88072c4c8000 ffff88072f20aee0: ffff880402cb94a8 ffff88072f20b028 ffffffff839f4970 ffff88072f20b068 ffff88072f20af00: 0000000000000000 0000000000000000 ffff88072f20b028 ffffffff839f4970 ffff88072f20af20: ffffffff832ad2e7 ffffffff81338a05 ffffffff81448fa2 ffff880402cb94a8 ffff88072f20af40: ffff880402cb94a8 ffff88072f20b0a8 00000000ffffffff 0000000000000018 ffff88072f20af60: ffff88072f20bef8 ffffffff839f4970 ffff88072f20b028 ffff88072f20aff8 ffff88072f20af80: ffffffff8133c807 0000000000000000 00000000ffffffff 0000000000000000 ffff88072f20afa0: ffff88072f20af80 ffffffff8133c7c5 ffff88072f20bef8 0000000000000000 ffff88072f20afc0: 0000000000000000 000000002f20b080 1ffff100e5e41601 0000000000000018 ffff88072f20afe0: ffff88072f20bef8 ffff88072c4c8000 ffff88072f20c000 ffff88072f20b0a8 ffff88072f20b000: ffffffff8151fea9 0000000041b58ab3 ffffffff839ff69c ffffffff8151fdf3 ffff88072f20b020: ffffffff839ff69c ffffffff00000030 ffff88072f20b0b8 ffff88072f20b068 ffff88072f20b040: ffff88072f20b020 ffffffff839f4970 ffff88072f20bff8 ffffffff8151fdf8 ffff88072f20b060: ffffffff813b9d58 ffff88072f20b090 ffff88072f20b040 ffff88072f20b020 ffff88072f20b080: ffff88072f20b090 ffff88072f20b040 ffff88072f20b020 ffff88072f20b060 ffff88072f20b0a0: 0000000000000009 ffff88072f20b178 ffffffff811504e6 ffffffff814e6b83 ffff88072f20b0c0: ffffffff839fbd23 000000002f20b188 0000000000000020 ffffffff839fbd5b 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00000000ffffffff ffffed00e5e426ca ffff88072f20bf40: 00000000000004c1 0000000000000000 1ffff1008435ffaf 0000000000000000 ffff88072f20bf60: 0000000000000000 ffff88072f224f10 ffffffffffffffff ffffffff814e6b83 ffff88072f20bf80: 0000000000000010 0000000000000806 ffff88072f207f60 0000000000000018 ffff88072f20bfa0: ffffffff814e6b83 0000000000000010 0000000000000806 ffff88072f207f60 ffff88072f20bfc0: 0000000000000018 0000000000000001 0000000000000000 ffffffff814e6b83 ffff88072f20bfe0: 0000000000000010 0000000000000806 ffff88072f207f60 0000000000000018 d <IRQ> d flush_smp_call_function_queue+0x111/0x310 d generic_smp_call_function_single_interrupt+0x13/0x30 d smp_call_function_single_interrupt+0x64/0x90 d call_function_single_interrupt+0x90/0xa0 dRIP: 0010:cpuidle_enter_state+0x121/0x7a0 dRSP: 0018:ffff88072c4d7e28 EFLAGS: 00000246c ORIG_RAX: ffffffffffffff04 dRAX: 0000000000000000 RBX: ffff88072f22b720 RCX: 000000000000001f dRDX: 1ffff100e5e442f9 RSI: 000000002dd2f949 RDI: ffff88072f2217c8 dRBP: ffff88072c4d7e88 R08: 0000000000000007 R09: ffffffff83f3f320 dR10: 071c71c71c71c71c R11: ffff88072f21dd04 R12: 0000004c8bbe92c9 dR13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000060 d <EOI> ffff88072f200000: 0000000000000000 ... ffff88072f207560: 0000000000000000 ffff880413a83468 ffff880413a83300 0000000000000000 ffff88072f207580: ffff88072f2075e0 ffffffff814ffc80 0000000000000000 ffff88072f2075e0 ffff88072f2075a0: ffffffff8101b2ee ffff88072f213440 0000000000000000 ffff88072f224ff4 ffff88072f2075c0: ffff88072f2075e0 ffffffff8101d12c ffffffff83c167c0 ffff88072f213440 ffff88072f2075e0: ffff88072f2075f0 ffffffff8101d2a0 ffff88072f207688 ffffffff8100de4e ffff88072f207600: ffffed00e5e40eda ffff88072f213654 ffff880413a83300 ffff880413a83300 ffff88072f207620: ffffffff83c167c0 000000490bb75162 ffff88072f224f08 ffff88072f213658 ffff88072f207640: ffff88072f2076a0 ffff88072f213650 ffffffff00000000 ffff88072f213440 ffff88072f207660: ffffffff83c167c0 ffffffff83c167c0 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0000000000000000 0000000000000004 0000000000000001 ffff88072f207ae0: ffff88072c49f980 0000000000000000 ffffffff832ab465 0000000000000001 ffff88072f207b00: ffff88072f213440 0000000000000000 ffffffff810190d5 ffff88072f207b28 ffff88072f207b20: ffffffff832ab465 ffff88072f207b60 ffffffff810191fa 0000000000000000 ffff88072f207b40: ffff88072f207b60 ffffffff810191fa dffffc0000000000 ffff88072f207c88 ffff88072f207b60: ffff88072f207c48 ffffffff8100cac2 ffffffff832ad2e7 ffff88072f224f08 ffff88072f207b80: 1ffffffff082adc1 0000000000029fff 1ffff100e5e40f78 ffff88072f213b60 ffff88072f207ba0: ffff880400000002 ffff880700000000 ffff88072f207c80 ffff88072f213440 ffff88072f207bc0: 0000000041b58ab3 ffffffff839f6109 ffffffff8100c720 ffff88072f207c80 ffff88072f207be0: 0000000200000000 ffff88072f213440 0000000181448fa2 ffffffff8100c725 ffff88072f207c00: ffffffff839f60e8 ffffffff81009c50 0000000000000008 ffff880402cb9498 ffff88072f207c20: ffff88072f207c70 ffffffff81448fa2 ffff88072f213440 ffff880402cb94a8 ffff88072f207c40: ffffffff814ffc80 ffff880405b11980 0000000000000000 ffff880402cb9498 ffff88072f207c60: ffff88072f207cb0 ffffffff81448fa2 ffff88072f207d28 ffff880402cb94a8 ffff88072f207c80: ffffffff814ffc80 ffff880405b11980 0000000000000000 ffff880405b11b40 ffff88072f207ca0: ffff880405b11980 0000000000000001 ffff88072f207d68 ffffffff832ad2e7 ffff88072f207cc0: ffff880402cb9498 ffff88072f207d18 ffffffff81448fa2 ffffffff832ad2e7 ffff88072f207ce0: ffff880402cb94a8 ffffffff8101d12c ffff88072f213440 0000000000000000 ffff88072f207d00: dffffc0000000000 0000000000000000 0000000000000002 ffff88072f207dd0 ffff88072f207d20: ffffffff832ad2e7 0000000000000000 0000000000000002 ffff88072f207df0 ffff88072f207d40: ffffffff832ad2e7 ffff88072f207e18 ffffffff832ad2e7 ffffffff814ffc80 ffff88072f207d60: ffffffff8102bd25 ffffed00e5e426ca 00000000000004c1 0000000000000001 ffff88072f207d80: 00000000000003f1 0000000000000000 0000000000000000 0000000000000000 ffff88072f207da0: 0000000000000186 ffffffff8102e295 0000000000000000 0000000000000002 ffff88072f207dc0: 0000000000000400 ffffffff8101d105 ffff880402cb9498 ffff88072f207e28 ffff88072f207de0: ffffffff81448fa2 0000000000000000 ffff880402cb94a8 ffffffff814f840a ffff88072f207e00: 0000000000000000 ffff880405b11980 ffff88072f224f10 0000000000000000 ffff88072f207e20: ffff88072f224f08 ffff88072f207ee0 ffffffff832ad2e7 0000000000000000 ffff88072f207e40: dffffc0000000000 0000000000000000 1ffffffff0782d03 ffff88072f207f50 ffff88072f207e60: ffffffff83c167c0 ffff88072f213654 ffff88072f213658 ffffed00e5e426ca ffff88072f207e80: 00000000000004c1 0000000000000000 000000000000038f 1ffff100e5e426c8 ffff88072f207ea0: 0000000000000000 ffff88072f224f10 ffffffff83c167c0 ffffffff832ab465 ffff88072f207ec0: ffff88072f207ed8 ffffffff814eaff9 ffff88072f224f00 ffff88072f207f08 ffff88072f207ee0: ffff88072f207ef0 ffffffff832ab465 ffff88072f207f50 ffffffff814f840a ffff88072f207f00: 0000000000000000 ffff88072f207f50 ffffffff814f840a ffff88072f224fe8 ffff88072f207f20: ffff88072f224f98 ffff880421affd60 ffffffff814f8270 ffff880421affd78 ffff88072f207f40: ffff880421affcc0 ffffffff814e6a70 ffff88072f207f80 ffffffff814e6b6e ffff88072f207f60: 0000000000000001 ffff880421affca8 dffffc0000000000 0000000000000000 ffff88072f207f80: ffff88072f207fc0 ffffffff813b0dc1 ffff88072f207fa8 ffffffff83a77980 ffff88072f207fa0: 0000004c8bbe92c9 0000000000000001 0000000000000001 0000000000000060 ffff88072f207fc0: ffff88072f207fd0 ffffffff813b2693 ffff88072f207fe8 ffffffff8119e8f4 ffff88072f207fe0: ffff88072f22b720 ffff88072c4d7d79 ffffffff832adc10 ffff88072c4d7d78 d ? cpuidle_enter_state+0x11c/0x7a0 d ? cpuidle_enter_state+0x5/0x7a0 d ? cpuidle_enter+0x5/0x20 d cpuidle_enter+0x17/0x20 d call_cpuidle+0x47/0xc0 d ? call_cpuidle+0x5/0xc0 d cpu_startup_entry+0x1a6/0x2d0 d start_secondary+0x245/0x2d0 d start_cpu+0x5/0x14 ffff88072c4d0000: 0000000057ac6e9d 0000000000000000 0000000000000000 0000000000000000 ffff88072c4d0020: 0000000000000000 ... ffff88072c4d7620: 0000000000000010 0000000000000000 ffff88072c4d7930 ffffffff81510c31 ffff88072c4d7640: 0000000000000000 ... ffff88072c4d7660: 0000000000000010 0000000000000000 ffff88072c4d7970 ffffffff81510c31 ffff88072c4d7680: 0000000000000000 ffff88041fb1d8a8 0000000000000000 ffff88041fb1d800 ffff88072c4d76a0: 1ffff100e589aed8 ffffffe400000000 ffff88041e47cc80 ffff88072c4d79a0 ffff88072c4d76c0: 0000000041b58ab3 ffffffff83a0d8d8 ffffffff81510890 ffff88041fb1d800 ffff88072c4d76e0: 1ffff100e589aee0 ffffffe400000000 ffff88041e47cc80 ffff88072c4d79e0 ffff88072c4d7700: 0000000041b58ab3 ffffffff83a0d8d8 ffffffff81510890 0000000000000000 ffff88072c4d7720: 0000000000000000 ... ffff88072c4d7800: 0000000041b58ab3 ffffffff83a0d6b0 ffffffff814e3a20 0000000000000000 ffff88072c4d7820: 0000000000000000 ... ffff88072c4d7860: ffffffff8150cec6 0000000000000003 ffff88072f21bb20 1ffff100e589af38 ffff88072c4d7880: 0000000000000001 ffff880403093830 ffff88072c4d7948 ffffffff832ad2e7 ffff88072c4d78a0: ffff88072c4d78c8 ffffffff816213e5 ffff88072c4d79a0 ffff88072c4d7ce8 ffff88072c4d78c0: ffff88072c4d7bf8 ffff88072c4d7930 ffffffff8150f4b3 ffff880727eb3000 ffff88072c4d78e0: 0000000000000040 0000000000000000 dffffc0000000000 ffff880403093300 ffff88072c4d7900: 1ffff10080612706 0000000000000001 ffff88072c4c8380 ffff88072c4d79a0 ffff88072c4d7920: ffffffff81359c15 ffff88041e47ce88 ffff88072c4d7c08 ffffffff814e3bf8 ffff88072c4d7940: ffff88072c4d7970 ffff88072c4d7958 ffffffff81359c15 ffff88072c4d7bf8 ffff88072c4d7960: 0000000000000003 ffff88072f21bb20 ffffffff814f2df9 ffff88072c4c8000 ffff88072c4d7980: ffffffff814e3a20 ffff88072c4d7b40 dffffc0000000000 ffff880402cbcc90 ffff88072c4d79a0: ffff88072c4d7a58 ffffffff832ad2e7 ffffffff814f2df9 ffff88072c4c8000 ffff88072c4d79c0: ffffffff814e3a20 ffff88072c4d7b90 ffff88072c4d7ad0 ffff880402cbce88 ffff88072c4d79e0: ffff88072c4d7a98 ffffffff832ad2e7 ffff88072c4c8898 dffffc0000000000 ffff88072c4d7a00: dffffc0000000000 000000000000000a 1ffff100e5899112 ffff88072c4d7b40 ffff88072c4d7a20: 0000000000000000 0000000000000000 ffffffff81359c15 0000000000000000 ffff88072c4d7a40: dffffc0000000000 ffff880403093300 1ffff100e5899112 ffff88072c4d7a68 ffff88072c4d7a60: ffffffff81359c15 ffff88072c4d7ad0 ffff88072c4c8000 ffffffff814e3a20 ffff88072c4d7a80: ffff88072c4d7ad0 ffffffff814f2df9 ffff88072f220e5c ffffffff812a5c3b ffff88072c4d7aa0: ffff88072c4c8000 ffff88072f220d80 ffff880421f61e80 0000000000000000 ffff88072c4d7ac0: ffff88072c4c847c ffff88072c4d7b80 ffffffff832ad2e7 ffffffff814fe10a ffff88072c4d7ae0: ffff88072f21bb08 ffffffff8329e69c ffff88072f220d80 ffff88072c4d7bf8 ffff88072c4d7b00: ffff880421f61e80 ffff8804192d2400 ffff88072c4c8418 ffff88072c4c8898 ffff88072c4d7b20: dffffc0000000000 0000000000000003 ffff880402cb9498 ffff88072c4d7b88 ffff88072c4d7b40: ffffffff81448fa2 ffff88072f220d80 ffff880402cb94a8 ffffffff812faffe ffff88072c4d7b60: 0000000100006f11 ffff88072a547d00 ffff88072f220d80 dffffc0000000000 ffff88072c4d7b80: 0000000000000004 ffff88072c4d7c40 ffffffff832ad2e7 ffffffff832ab608 ffff88072c4d7ba0: ffff88072c4c8000 ffff88072c4d7bf8 ffff880402cb9498 ffff88072c4d7c08 ffff88072c4d7bc0: ffffffff81448fa2 ffff880402cb9498 ffff88072c4d7c20 ffffffff81448fa2 ffff88072c4d7be0: ffff88083fffa140 ffff880402cb94a8 ffffffff815834a0 00000000000249af ffff88072c4d7c00: ffff88072c4d7e50 ffff88072c4d7e50 0000000000000000 ffff88083fffc998 ffff88072c4d7c20: ffff88072c4d7cd8 ffffffff832ad2e7 ffff880402cb9498 ffff88072c4d7c88 ffff88072c4d7c40: ffffffff81448fa2 ffff880402cb9498 ffff880402cb94a8 ffffffff82d315e9 ffff88072c4d7c60: 0000000000188347 ffff88072f21dcc8 ffff88072f21dcc4 0000000000000000 ffff88072c4d7c80: 0000000000000001 ffff88072c4d7d40 ffffffff832ad2e7 ffff880402cb9498 ffff88072c4d7ca0: ffff88072c4d7cf0 ffff880402cb9498 ffff88072c4d7d00 ffff88072c4d7ea0 ffff88072c4d7cc0: ffffffff813a55db ffff880402cb94a8 ffffffff832ab076 ffffffff83f3f320 ffff88072c4d7ce0: ffff880402cb9498 ffff88072c4d7d38 ffffffff81448fa2 0000000000000000 ffff88072c4d7d00: ffff880402cb94a8 ffffffff82d2d9ae ffff88072f22b720 ffffffff83f3f320 ffff88072c4d7d20: 0000000000000001 0000000000000001 0000000000000060 ffff88072c4d7df0 ffff88072c4d7d40: ffffffff832ad2e7 ffffffff812b9035 ffff880402cb9498 ffff88072c4d7da8 ffff88072c4d7d60: ffffffff81448fa2 ffff88072c4d7e88 ffff880402cb94a8 0000000000000060 ffff88072c4d7d80: 0000000000000001 0000000000000001 0000004c8bbe92c9 ffff88072c4d7e88 ffff88072c4d7da0: ffff88072f22b720 ffff88072f21dd04 071c71c71c71c71c ffffffff83f3f320 ffff88072c4d7dc0: 0000000000000007 0000000000000000 000000000000001f 1ffff100e5e442f9 ffff88072c4d7de0: 000000002dd2f949 ffff88072f2217c8 ffffffffffffff04 ffffffff82d2d9d1 ffff88072c4d7e00: 0000000000000010 0000000000000246 ffff88072c4d7e28 0000000000000018 ffff88072c4d7e20: ffffffff82d2d9cc ffff88072f22b720 ffff88072f22b720 ffffffff82d2d8b5 ffff88072c4d7e40: 0000000000000007 ffffffff82d2e0d5 0000004c8ba3686a 0000004c8bbe92c9 ffff88072c4d7e60: ffff88072c4c8000 ffffffff83f3f320 000000000000000a ffff88072f22b720 ffff88072c4d7e80: ffffffff83f3f320 ffff88072c4d7e98 ffffffff82d2e0e7 ffff88072c4d7ec8 ffff88072c4d7ea0: ffffffff81312417 ffffffff813123d5 ffff88072c4d7f18 ffffed00e5899000 ffff88072c4d7ec0: ffff88072c4c8000 ffff88072c4d7f18 ffffffff81312756 ffffed00e5899000 ffff88072c4d7ee0: ffff88072c4c8000 ffff88072c4c8000 000000000000000a ffff88072f213100 ffff88072c4d7f00: 00000000002ab0ae 0000000000000000 0000000000000000 ffff88072c4d7f48 ffff88072c4d7f20: ffffffff811a0e95 0000000000000000 0000000000000000 0000000000000000 ffff88072c4d7f40: 0000000000000000 0000000000000000 ffffffff810001a5 0000000000000000 ffff88072c4d7f60: 0000000000000000 ... 3Memory state around the buggy address: 3 ffff88072f20bc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff88072f20bd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3>ffff88072f20bd80: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 3 ^ 3 ffff88072f20be00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff88072f20be80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3================================================================== ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 9:13 ` Peter Zijlstra @ 2016-11-17 9:30 ` Peter Zijlstra 2016-11-17 9:48 ` Dmitry Vyukov 0 siblings, 1 reply; 33+ messages in thread From: Peter Zijlstra @ 2016-11-17 9:30 UTC (permalink / raw) To: Josh Poimboeuf Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Thu, Nov 17, 2016 at 10:13:41AM +0100, Peter Zijlstra wrote: > On Thu, Nov 17, 2016 at 10:04:46AM +0100, Peter Zijlstra wrote: > > On Wed, Nov 16, 2016 at 10:48:28PM -0600, Josh Poimboeuf wrote: > > > Peter or Vince, can you try to recreate with this patch? It dumps the > > > raw stack contents during a stack dump. Hopefully that would give a > > > clue about what's going wrong. > > > > > > Here goes... I'll do another run and get you the results of that as > > well. > > This one is funny, I've not seen that WARNING before. Let me do a third > run. > 3================================================================== 3BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x1fb/0x220 at addr ffff88042f84baa0 3Read of size 8 by task perf_fuzzer/8638 0page:ffffea0010be12c0 count:1 mapcount:0 mapping: (null) index:0x0c 0flags: 0x2ffff8000000400(reserved) 1page dumped because: kasan: bad access detected dCPU: 1 PID: 8638 Comm: perf_fuzzer Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #4 dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 dCall Trace: d <NMI> d dump_stack+0x67/0x94 d kasan_report_error+0x4a1/0x4d0 d __asan_report_load8_noabort+0x43/0x50 d ? unwind_get_return_address+0x1fb/0x220 d unwind_get_return_address+0x1fb/0x220 d perf_callchain_kernel+0x356/0x550 d ? arch_perf_update_userpage+0x350/0x350 d ? insn_get_opcode.part.4+0x3ac/0x910 d get_perf_callchain+0x276/0x670 d ? early_serial_putc+0x24/0x70 d ? put_callchain_buffers+0x50/0x50 d ? early_serial_putc+0x1d/0x70 d ? insn_get_displacement.part.7+0x4a/0x500 d perf_callchain+0x128/0x1a0 d ? early_serial_putc+0x1d/0x70 d perf_prepare_sample+0x70e/0xfb0 d ? intel_pmu_pebs_fixup_ip+0x2c9/0x4c0 d perf_event_output_forward+0x93/0x110 d ? perf_prepare_sample+0xfb0/0xfb0 d ? early_serial_putc+0x1d/0x70 d ? early_serial_putc+0x24/0x70 d ? early_serial_putc+0x24/0x70 d ? sched_clock_cpu+0x11c/0x1a0 d __perf_event_overflow+0x1a3/0x570 d perf_event_overflow+0x14/0x20 d __intel_pmu_pebs_event+0x3ca/0x610 d ? pebs_update_state+0x310/0x310 d ? early_serial_putc+0x1d/0x70 d ? intel_pmu_disable_bts+0xc0/0xc0 d ? early_serial_putc+0x1d/0x70 d ? insn_get_prefixes.part.2+0x36d/0xc70 d ? insn_get_opcode.part.4+0x3ac/0x910 d ? number+0x71c/0xa70 d ? insn_get_opcode+0x42/0x50 d ? branch_type+0x122/0x3a0 d ? put_dec+0xb0/0xb0 d ? knc_pmu_handle_irq+0x3a0/0x3a0 d intel_pmu_drain_pebs_nhm+0x5f6/0xbf0 d ? __intel_pmu_pebs_event+0x610/0x610 d ? early_serial_write+0x7c/0xf0 d intel_pmu_handle_irq+0x4b2/0xa90 d ? intel_pmu_save_and_restart+0xe0/0xe0 d ? acpi_os_read_memory+0x228/0x262 d ? acpi_os_get_timer+0x1a/0x1a d ? vunmap_page_range+0x269/0x400 d ? ghes_copy_tofrom_phys+0x149/0x270 d ? ghes_read_estatus+0x11e/0x6b0 d ? ghes_copy_tofrom_phys+0x270/0x270 d perf_event_nmi_handler+0x2d/0x50 d nmi_handle+0x9e/0x250 d default_do_nmi+0x111/0x180 d do_nmi+0x1a2/0x210 d end_repeat_nmi+0x1a/0x1e dRIP: 0010:__intel_pmu_enable_all+0x11d/0x190 dRSP: 0018:ffff88042419f9b0 EFLAGS: 00000046c dRAX: 0000000000000000 RBX: ffff88072594aa80 RCX: 000000000000038f dRDX: 1ffff10085f0a6c8 RSI: 0000000000000000 RDI: ffff88042f853640 dRBP: ffff88042419f9b8 R08: 00000000000004c1 R09: ffffed0085f0a6ca dR10: 00000000ffffffff R11: 1ffff10085f0a6ec R12: 000000070000000f dR13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000002 d ? __intel_pmu_enable_all+0x11d/0x190 d ? __intel_pmu_enable_all+0x11d/0x190 d <EOE> ffff88042f84a000: 0000000000000000 ... ffff88042f84a560: ffff8804af84a955 ffff88042f84a95d 0000000000000060 1ffff10085f094b8 ffff88042f84a580: 00000000ffffffff 0020000000000000 0000000000000000 00000000fffffffd ffff88042f84a5a0: 0000000000000001 0000000000000190 0000000000000010 ffff1060ffffff09 ffff88042f84a5c0: 0000000041b58ab3 ffff8804af84a9bd ffff88042f84a9c5 0000000000000060 ffff88042f84a5e0: 1ffff10085f094c5 00000000ffffffff 0020000000000000 0000000000000000 ffff88042f84a600: 00000000fffffffd 0000000000000001 0000000000000190 ffffffff8348be10 ffff88042f84a620: ffff1060ffffff09 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 ffff88042f84a640: ffff88042f84a700 ffff88042f313930 ffffffff823b7c54 ffff88042f84a758 ffff88042f84a660: ffff88042f84a760 ffff88042f84a758 ffff88042f84a956 0000000000000001 ffff88042f84a680: ffffffff8348bec9 ffff88042f84a9c5 0000000000000018 dffffc0000000000 ffff88042f84a6a0: ffff88042f84a818 ffff88042f84a768 ffff88042f84a790 ffffffff823b7c54 ffff88042f84a6c0: ffff88042f84a7c0 ffff88042f84a7c8 ffff88042f84a7c0 ffff88042f84a9be ffff88042f84a6e0: 1ffff10085f094e1 ffffed0085f094f9 000000007fffffff ffff8804af84a9bd ffff88042f84a700: ffffffff8348beca 0000000041b58ab3 ffffffff83a405aa ffffffff823b6ef0 ffff88042f84a720: 0000000000000000 ffff1060ffffff09 ffffffff823b8d95 0000000041b58ab3 ffff88042f84a740: ffffffff839ff69c ffffffff823b8d00 0000000000000000 0000000000000020 ffff88042f84a760: ffff88042f84a7e0 ffffed0085f094f4 1ffff10085f0950a ffff88042f84a930 ffff88042f84a780: ffffffff8101d21d ffffffffffffffff ffff88042f84a838 ffffffff823b8d95 ffff88042f84a7a0: 0000000041b58ab3 ffffffff839ff69c ffffffff823b8d00 ffffffff83892478 ffff88042f84a7c0: ffffffff00000020 ffff88042f84a848 ffff88042f84a800 ffff88042f84a870 ffff88042f84a7e0: ffff88042f84a9a8 dffffc0000000000 ffff88042f84a838 ffffffff813c861f ffff88042f84a800: ffffffff8348beca 0000000000000000 000000000000011d 0000000000000190 ffff88042f84a820: ffffffff83892478 ffffffff83892478 ffff88042f84a9a8 ffff88042f84a958 ffff88042f84a840: ffffffff813c883f 0000000000000016 0000000041b58ab3 ffffffff83a0c758 ffff88042f84a860: ffffffff813c86d0 ffffed0085f09514 0000000000000000 ffff88042f84aa30 ffff88042f84a880: ffff0a00ffffff05 ffff88042f84a962 ffff88042f84ac9e ffff88042f84a963 ffff88042f84a8a0: 0000000000000000 ffff88042f84a900 000000000000011d 0000000000000000 ffff88042f84a8c0: 0000000000000020 1ffff10085f09524 ffff0a00ffffff05 1ffff10085f09524 ffff88042f84a8e0: ffff88042f84a940 ffff0a00ffffff05 ffff88042f84a9ca ffff88042f84acff ffff88042f84a900: ffff88042f84a9cb 0000000000000000 ffff88042f84a968 ffffffff823adbcd ffff88042f84a920: 0000000041b58ab3 ffffffff83a40559 1ffff10085f09531 ffff0a00ffffff05 ffff88042f84a940: 1ffff10085f09531 ffff88042f84a9a8 ffff88042f84acdd ffff88042f84aed8 ffff88042f84a960: ffff0a00ffffff05 ffff88042f84aaf0 ffffffff823af620 0000000000000000 ffff88042f84a980: 0000000000000000 0000000041b58ab3 ffffffff83a40559 ffffffff823af530 ffff88042f84a9a0: 0000000000000000 5f6c65746e695f5f 62616e655f756d70 302b6c6c615f656c ffff88042f84a9c0: 3178302f64313178 0030300030003039 0000000000000000 0000000000000000 ffff88042f84a9e0: 0000000000000000 ffff0a00ffffff05 ffff88042f84aacd ffff88042f84ae22 ffff88042f84aa00: ffff88042f84aace ffff88042f84aed8 ffff88042f84acd8 ffffffff823adb30 ffff88042f84aa20: 1ffff10085f0954d 00000000ffffffff 0020f10085f09551 ffff0a00ffffff00 ffff88042f84aa40: 1ffff10000000010 ffff88042f84aa00 ffff88042f84aa20 ffff88042f84af10 ffff88042f84aa60: ffff103000001005 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 ffff88042f84aa80: ffffffffffffffff 3266383461613630 6666666638383034 ffffffff00000010 ffff88042f84aaa0: 0000000000000000 0000000000000002 ffff88042f84af10 ffff103000001009 ffff88042f84aac0: 0000000041b58ab3 ffff88042f84aed8 ffff88042f84ad1d ffff88042f84ac30 ffff88042f84aae0: 1ffff10085f09565 ffffffffffffffff 002088042f84abb0 ffffffff823b6600 ffff88042f84ab00: ffffffff00000010 ffff88042f84ad00 ffffffff823b6600 ffff88042f84ac10 ffff88042f84ab20: ffff103000001009 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 ffff88042f84ab40: ffffffff839f498b 3832336162393630 6666666666666666 ffff88042f84ac2f ffff88042f84ab60: ffff88042f84abb0 ffffffff823ad785 ffff88042f84ac70 0000000000000001 ffff88042f84ab80: ffff88042f84ad2d ffff88042f84abb0 ffffffff816213e5 ffff88042f84ad2d ffff88042f84aba0: ffffffff839f498f dffffc0000000000 ffff88042f84ac90 ffffffff823b72eb ffff88042f84abc0: ffff88042f84afd0 ffff88042f84afd8 ffffffff839f4990 ffff88042f84acd8 ffff88042f84abe0: 1ffff10085f09581 ffffed0085f095fb 0000000000000200 ffff88042f84aed8 ffff88042f84ac00: 0000000000000001 0000000041b58ab3 ffffffff83a405aa ffffffff823b6ef0 ffff88042f84ac20: ffff88042f84ac70 ffff103000001000 1ffff10085f0958a ffffffff83c88b40 ffff88042f84ac40: ffff88042f84aeb8 ffffffff81338af4 0000000041b58ab3 ffff88042f84ac78 ffff88042f84ac60: ffffffff811c0a51 ffff88042f84ad2e dffffc0000000000 ffff88042f84aca8 ffff88042f84ac80: ffffffff811c0afc ffff88042f84acd8 00000000ffffffff 1ffff10085f09597 ffff88042f84aca0: 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dffffc0000000000 ffffffff00000000 ffff88042419f5c0: ffff88042419f820 ffff88042419f6d8 ffff88042419f5e0 ffffffff823d7aa5 ffff88042419f5e0: ffff88042419f700 ffffffff8100954c ffff88042419f6e0 ffff880400000005 ffff88042419f600: ffff880400000002 dffffc0000000000 1ffff10084833ec3 0000000041b58ab3 ffff88042419f620: ffffffff839f60d6 ffffffff81009250 ffffffff8101a831 0000000200000005 ffff88042419f640: 0000000000000002 ffff88042f853b60 0000000000000005 0000000000000021 ffff88042419f660: 0000000000000001 0000000200000001 0000000000000000 0000000000000000 ffff88042419f680: 0000000000000000 ... ffff88042419f6a0: 0000000000000000 0000000000000000 ffff88042419f700 ffffffff8101c610 ffff88042419f6c0: ffff880400000001 ffff880700000001 ffff880700000040 0000000000000000 ffff88042419f6e0: ffff88042419f700 ffffffff810191fa dffffc0000000000 ffff88042419f828 ffff88042419f700: ffff88042419f7e8 ffffffff8100cac2 ffff88072594aa80 ffff880419217c00 ffff88042419f720: 1ffffffff082adc1 0000000000029ffe 1ffff10084833eec ffff88042f853b60 ffff88042419f740: ffff880700000002 ffff880400000000 ffff88042419f820 ffff88042f853440 ffff88042419f760: 0000000041b58ab3 ffffffff839f6109 ffffffff8100c720 ffff88042f853440 ffff88042419f780: 0000000200000000 ffffffff81009e18 0000000100000000 0000000041b58ab3 ffff88042419f7a0: ffffffff839f60e8 ffffffff81009c50 0000000000000008 ffff88042f853660 ffff88042419f7c0: ffff88042419f7e8 ffffffff816213e5 ffff88042f853440 ffff88042f853440 ffff88042419f7e0: 1ffff10084833f00 ffff88042419f968 ffffffff81009b68 ffffffff83c167c0 ffff88042419f800: 0000000041b58ab3 ffffffff839f60e8 ffffffff810099d0 ffff88042419f9b0 ffff88042419f820: 0000000000000021 ffffed0084833f21 000000007fffffff ffff8804a419f9af ffff88042419f840: ffffffff81621106 0000000000000000 dffffc0000000000 ffff88042419f868 ffff88042419f860: ffffffff81621428 ffff88042419f950 ffffffff8153ccb5 1ffff10084833f1c ffff88042419f880: 0000000000000001 0000000000000000 ffff88042419fd60 ffff88042419f9c0 ffff88042419f8a0: ffff88042c3f8168 ffff88042c3f8000 0000000000000000 ffff88042419f918 ffff88042419f8c0: ffffffff814ffc80 0000000000000021 ffff88042419f918 ffff88072594ab08 ffff88042419f8e0: ffff88072594aa80 0000000000000000 ffff88042419f950 ffffffff814ffc80 ffff88042419f900: ffff88042419f968 0000000000000082 0000000000000000 ffff88042419f978 ffff88042419f920: ffff88072594aa80 0000000000000000 ffff88042419f990 ffffffff814ffc80 ffff88042419f940: ffff88072594abd8 0000000000000001 ffff88042419f990 ffffffff8101e082 ffff88042419f960: dffffc0000000000 ffff88042f853648 0000000000000000 ffff88072594ac40 ffff88042419f980: ffff88042f853440 0000000000000000 dffffc0000000000 ffff88042419f9b8 ffff88042419f9a0: ffffffff8101d12c ffff88072594aa80 ffff88042f853440 ffff88042419f9c8 ffff88042419f9c0: ffffffff8101d2a0 ffff88042419fa60 ffffffff8100de4e ffff88042419fa50 ffff88042419f9e0: ffffffff814f793c 00000001812c58ec ffff88042f864f08 ffff880419217c00 ffff88042419fa00: ffffed0085f0c9fe ffff88042f853654 ffff88042f853658 ffffed0085f0a6ca ffff88042419fa20: ffff88042f853650 0000000000000002 ffff88040672ea07 ffffffff83c167c0 ffff88042419fa40: ffffffff83c167c0 ffff880419217c00 ffffffff83c167c0 ffff88072594aa80 ffff88042419fa60: ffff88042419fa78 ffffffff814eaff9 ffff88042f864f00 ffff88042419faa8 ffff88042419fa80: ffffffff814f8217 ffff880419217c00 ffff880419217c00 ffff88042f864f08 ffff88042419faa0: dffffc0000000000 ffff88042419fb00 ffffffff814f92a4 ffff88070972d458 ffff88042419fac0: ffff88042419fe40 ffff88072594aaa0 ffffffff815af787 ffff88042f864f08 ffff88042419fae0: ffff880419217c00 ffff880419217c00 ffff88072594aa80 ffffffff814f8b90 ffff88042419fb00: ffff88042419fb48 ffffffff814e1b2e ffff88042419fd70 ffff88042f864f10 ffff88042419fb20: ffff88042419fca0 ffffffff814e1950 ffff88042419fcb8 0000000000000001 ffff88042419fb40: ffffffff814e6a70 ffff88042419fb78 ffffffff814e6b6e ffff88042419fb78 ffff88042419fb60: 0000000000000246 ffff88042419fc18 1ffff10084833f7c ffff88042419fbb8 ffff88042419fb80: ffffffff813b1163 ffff88042419fca0 ffffffff814e6a70 ffff88042419fc40 ffff88042419fba0: 0000000000000007 1ffff10084833f7c 0000000000000001 ffff88042419fc68 ffff88042419fbc0: ffffffff813b1472 ffff88042419fbf8 0000000000000246 ffffffff83a77980 ffff88042419fbe0: 0000000041b58ab3 ffffffff83a05fdf ffffffff813b12c0 ffff88042419fc18 ffff88042419fc00: 0000000000000000 ... ffff88042419fc20: ffffffff813b10d3 ffffffff815b1920 1ffff10084833f88 ffff88042419fce0 ffff88042419fc40: ffffed0080ce5d5e 0000000000000007 ffff88042419fce0 1ffff10084833f90 ffff88042419fc60: ffff88040672eac0 ffff88042419fd08 ffffffff814e25e1 ffff88040672eaf4 ffff88042419fc80: 0000000041b58ab3 ffffffff839ff26b ffffffff814e2530 0000000000000000 ffff88042419fca0: ffff88040672eac0 ffffffff814e1950 ffff88042419fd70 00000000fffffffd ffff88042419fcc0: ffff88042419fda0 00007ffc0d8588d0 0000000040082404 ffff88070972d458 ffff88042419fce0: ffff880419217c00 ffffed0083242f8f ffff88040672eac0 dffffc0000000000 ffff88042419fd00: ffff88072594aca8 ffff88042419fe18 ffffffff814e27dc ffff880419217c78 ffff88042419fd20: 1ffff10084833faa 0000000000000000 ffffffff814f8b90 ffff88072594aa80 ffff88042419fd40: ffff880419217c90 ffff88042419fd70 0000000041b58ab3 ffffffff83a0a00b ffff88042419fd60: ffffffff814e2630 ffffffff83a12428 ffff88072594aa80 ffffffff814f8b90 ffff88042419fd80: 0000000000000000 0000000000000000 0000000041b58ab3 ffffffff83a142a0 ffff88042419fda0: ffff88070c3a8a00 1ffff10084833fc0 0000000000000000 ffffffff814e1950 ffff88042419fdc0: ffff88042419fd70 ffff880400000000 ffffffff81694cc2 ffff88042419fe10 ffff88042419fde0: ffff88041ed2b600 ffff8807282b0020 ffff88072594aa80 ffff880419217c08 ffff88042419fe00: ffffffff814e29b0 dffffc0000000000 ffff88072594aca8 ffff88042419fe38 ffff88042419fe20: ffffffff814e2a3f ffff880419217c00 ffff88072594aa80 ffff88042419fe70 ffff88042419fe40: ffffffff814e1d53 ffff88072594aa80 ffff880419217c00 ffff88040672f378 ffff88042419fe60: dffffc0000000000 00007f382af1c0a4 ffff88042419fea0 ffffffff814ff76b ffff88042419fe80: 0000000000000001 1ffff10084833fd8 00007ffc0d8588cc 0000000000000020 ffff88042419fea0: ffff88042419ff48 ffffffff8126fb41 00007f382af1c0a4 ffff88040672eac0 ffff88042419fec0: 0000000041b58ab3 ffffffff83a00b7c ffffffff8126f3e0 ffff88040672eac0 ffff88042419fee0: 0000000000000000 0000000000000008 ffff88070972d458 ffffffff8100201a ffff88042419ff00: ffff88040672eac0 00007f382af1c0a4 00007f382af1c120 00007f382af1c0a4 ffff88042419ff20: 0000000000000000 0000000000401810 00007ffc0d85ac80 0000000000000000 ffff88042419ff40: 0000000000000000 00007ffc0d858900 ffffffff832abc2a 0000000000000000 ffff88042419ff60: 0000000000000000 00007ffc0d85ac80 0000000000401810 00007ffc0d858900 ffff88042419ff80: 0000000000000000 0000000000000202 00007f382af1c0a4 00007f382af1c120 ffff88042419ffa0: 00007f382af1c0a4 ffffffffffffffda 00007f382ac68a4a 0000000000000001 ffff88042419ffc0: 00007ffc0d8588cc 0000000000000020 000000000000009d 00007f382ac68a4a ffff88042419ffe0: 0000000000000033 0000000000000202 00007ffc0d8588e8 000000000000002b 3Memory state around the buggy address: 3 ffff88042f84b980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff88042f84ba00: 00 00 00 00 00 f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 3>ffff88042f84ba80: f2 00 00 f4 f4 f2 f2 f2 f2 00 00 f4 f4 f3 f3 f3 3 ^ 3 ffff88042f84bb00: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3 ffff88042f84bb80: f1 f1 f1 f1 f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 f2 3================================================================== ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 9:30 ` Peter Zijlstra @ 2016-11-17 9:48 ` Dmitry Vyukov 2016-11-17 14:01 ` Josh Poimboeuf 0 siblings, 1 reply; 33+ messages in thread From: Dmitry Vyukov @ 2016-11-17 9:48 UTC (permalink / raw) To: Peter Zijlstra Cc: Josh Poimboeuf, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, Stephane Eranian On Thu, Nov 17, 2016 at 10:30 AM, Peter Zijlstra <peterz@infradead.org> wrote: >> > > Peter or Vince, can you try to recreate with this patch? It dumps the >> > > raw stack contents during a stack dump. Hopefully that would give a >> > > clue about what's going wrong. >> > >> > >> > Here goes... I'll do another run and get you the results of that as >> > well. >> >> This one is funny, I've not seen that WARNING before. Let me do a third >> run. >> > > 3================================================================== > 3BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x1fb/0x220 at addr ffff88042f84baa0 > 3Read of size 8 by task perf_fuzzer/8638 > 0page:ffffea0010be12c0 count:1 mapcount:0 mapping: (null) index:0x0c > 0flags: 0x2ffff8000000400(reserved) > 1page dumped because: kasan: bad access detected > dCPU: 1 PID: 8638 Comm: perf_fuzzer Not tainted 4.9.0-rc5-00530-gd8866fc-dirty #4 > dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013 > dCall Trace: > d <NMI> > d dump_stack+0x67/0x94 > d kasan_report_error+0x4a1/0x4d0 > d __asan_report_load8_noabort+0x43/0x50 > d ? unwind_get_return_address+0x1fb/0x220 > d unwind_get_return_address+0x1fb/0x220 > d perf_callchain_kernel+0x356/0x550 > d ? arch_perf_update_userpage+0x350/0x350 > d ? insn_get_opcode.part.4+0x3ac/0x910 > d get_perf_callchain+0x276/0x670 > d ? early_serial_putc+0x24/0x70 > d ? put_callchain_buffers+0x50/0x50 > d ? early_serial_putc+0x1d/0x70 > d ? insn_get_displacement.part.7+0x4a/0x500 > d perf_callchain+0x128/0x1a0 > d ? early_serial_putc+0x1d/0x70 > d perf_prepare_sample+0x70e/0xfb0 > d ? intel_pmu_pebs_fixup_ip+0x2c9/0x4c0 > d perf_event_output_forward+0x93/0x110 > d ? perf_prepare_sample+0xfb0/0xfb0 > d ? early_serial_putc+0x1d/0x70 > d ? early_serial_putc+0x24/0x70 > d ? early_serial_putc+0x24/0x70 > d ? sched_clock_cpu+0x11c/0x1a0 > d __perf_event_overflow+0x1a3/0x570 > d perf_event_overflow+0x14/0x20 > d __intel_pmu_pebs_event+0x3ca/0x610 > d ? pebs_update_state+0x310/0x310 > d ? early_serial_putc+0x1d/0x70 > d ? intel_pmu_disable_bts+0xc0/0xc0 > d ? early_serial_putc+0x1d/0x70 > d ? insn_get_prefixes.part.2+0x36d/0xc70 > d ? insn_get_opcode.part.4+0x3ac/0x910 > d ? number+0x71c/0xa70 > d ? insn_get_opcode+0x42/0x50 > d ? branch_type+0x122/0x3a0 > d ? put_dec+0xb0/0xb0 > d ? knc_pmu_handle_irq+0x3a0/0x3a0 > d intel_pmu_drain_pebs_nhm+0x5f6/0xbf0 > d ? __intel_pmu_pebs_event+0x610/0x610 > d ? early_serial_write+0x7c/0xf0 > d intel_pmu_handle_irq+0x4b2/0xa90 > d ? intel_pmu_save_and_restart+0xe0/0xe0 > d ? acpi_os_read_memory+0x228/0x262 > d ? acpi_os_get_timer+0x1a/0x1a > d ? vunmap_page_range+0x269/0x400 > d ? ghes_copy_tofrom_phys+0x149/0x270 > d ? ghes_read_estatus+0x11e/0x6b0 > d ? ghes_copy_tofrom_phys+0x270/0x270 > d perf_event_nmi_handler+0x2d/0x50 > d nmi_handle+0x9e/0x250 > d default_do_nmi+0x111/0x180 > d do_nmi+0x1a2/0x210 > d end_repeat_nmi+0x1a/0x1e > dRIP: 0010:__intel_pmu_enable_all+0x11d/0x190 > dRSP: 0018:ffff88042419f9b0 EFLAGS: 00000046c > dRAX: 0000000000000000 RBX: ffff88072594aa80 RCX: 000000000000038f > dRDX: 1ffff10085f0a6c8 RSI: 0000000000000000 RDI: ffff88042f853640 > dRBP: ffff88042419f9b8 R08: 00000000000004c1 R09: ffffed0085f0a6ca > dR10: 00000000ffffffff R11: 1ffff10085f0a6ec R12: 000000070000000f > dR13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000002 > d ? __intel_pmu_enable_all+0x11d/0x190 > d ? __intel_pmu_enable_all+0x11d/0x190 > d <EOE> > ffff88042f84a000: 0000000000000000 ... > ffff88042f84a560: ffff8804af84a955 ffff88042f84a95d 0000000000000060 1ffff10085f094b8 > ffff88042f84a580: 00000000ffffffff 0020000000000000 0000000000000000 00000000fffffffd > ffff88042f84a5a0: 0000000000000001 0000000000000190 0000000000000010 ffff1060ffffff09 > ffff88042f84a5c0: 0000000041b58ab3 ffff8804af84a9bd ffff88042f84a9c5 0000000000000060 > ffff88042f84a5e0: 1ffff10085f094c5 00000000ffffffff 0020000000000000 0000000000000000 > ffff88042f84a600: 00000000fffffffd 0000000000000001 0000000000000190 ffffffff8348be10 > ffff88042f84a620: ffff1060ffffff09 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 > ffff88042f84a640: ffff88042f84a700 ffff88042f313930 ffffffff823b7c54 ffff88042f84a758 > ffff88042f84a660: ffff88042f84a760 ffff88042f84a758 ffff88042f84a956 0000000000000001 > ffff88042f84a680: ffffffff8348bec9 ffff88042f84a9c5 0000000000000018 dffffc0000000000 > ffff88042f84a6a0: ffff88042f84a818 ffff88042f84a768 ffff88042f84a790 ffffffff823b7c54 > ffff88042f84a6c0: ffff88042f84a7c0 ffff88042f84a7c8 ffff88042f84a7c0 ffff88042f84a9be > ffff88042f84a6e0: 1ffff10085f094e1 ffffed0085f094f9 000000007fffffff ffff8804af84a9bd > ffff88042f84a700: ffffffff8348beca 0000000041b58ab3 ffffffff83a405aa ffffffff823b6ef0 > ffff88042f84a720: 0000000000000000 ffff1060ffffff09 ffffffff823b8d95 0000000041b58ab3 > ffff88042f84a740: ffffffff839ff69c ffffffff823b8d00 0000000000000000 0000000000000020 > ffff88042f84a760: ffff88042f84a7e0 ffffed0085f094f4 1ffff10085f0950a ffff88042f84a930 > ffff88042f84a780: ffffffff8101d21d ffffffffffffffff ffff88042f84a838 ffffffff823b8d95 > ffff88042f84a7a0: 0000000041b58ab3 ffffffff839ff69c ffffffff823b8d00 ffffffff83892478 > ffff88042f84a7c0: ffffffff00000020 ffff88042f84a848 ffff88042f84a800 ffff88042f84a870 > ffff88042f84a7e0: ffff88042f84a9a8 dffffc0000000000 ffff88042f84a838 ffffffff813c861f > ffff88042f84a800: ffffffff8348beca 0000000000000000 000000000000011d 0000000000000190 > ffff88042f84a820: ffffffff83892478 ffffffff83892478 ffff88042f84a9a8 ffff88042f84a958 > ffff88042f84a840: ffffffff813c883f 0000000000000016 0000000041b58ab3 ffffffff83a0c758 > ffff88042f84a860: ffffffff813c86d0 ffffed0085f09514 0000000000000000 ffff88042f84aa30 > ffff88042f84a880: ffff0a00ffffff05 ffff88042f84a962 ffff88042f84ac9e ffff88042f84a963 > ffff88042f84a8a0: 0000000000000000 ffff88042f84a900 000000000000011d 0000000000000000 > ffff88042f84a8c0: 0000000000000020 1ffff10085f09524 ffff0a00ffffff05 1ffff10085f09524 > ffff88042f84a8e0: ffff88042f84a940 ffff0a00ffffff05 ffff88042f84a9ca ffff88042f84acff > ffff88042f84a900: ffff88042f84a9cb 0000000000000000 ffff88042f84a968 ffffffff823adbcd > ffff88042f84a920: 0000000041b58ab3 ffffffff83a40559 1ffff10085f09531 ffff0a00ffffff05 > ffff88042f84a940: 1ffff10085f09531 ffff88042f84a9a8 ffff88042f84acdd ffff88042f84aed8 > ffff88042f84a960: ffff0a00ffffff05 ffff88042f84aaf0 ffffffff823af620 0000000000000000 > ffff88042f84a980: 0000000000000000 0000000041b58ab3 ffffffff83a40559 ffffffff823af530 > ffff88042f84a9a0: 0000000000000000 5f6c65746e695f5f 62616e655f756d70 302b6c6c615f656c > ffff88042f84a9c0: 3178302f64313178 0030300030003039 0000000000000000 0000000000000000 > ffff88042f84a9e0: 0000000000000000 ffff0a00ffffff05 ffff88042f84aacd ffff88042f84ae22 > ffff88042f84aa00: ffff88042f84aace ffff88042f84aed8 ffff88042f84acd8 ffffffff823adb30 > ffff88042f84aa20: 1ffff10085f0954d 00000000ffffffff 0020f10085f09551 ffff0a00ffffff00 > ffff88042f84aa40: 1ffff10000000010 ffff88042f84aa00 ffff88042f84aa20 ffff88042f84af10 > ffff88042f84aa60: ffff103000001005 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 > ffff88042f84aa80: ffffffffffffffff 3266383461613630 6666666638383034 ffffffff00000010 > ffff88042f84aaa0: 0000000000000000 0000000000000002 ffff88042f84af10 ffff103000001009 > ffff88042f84aac0: 0000000041b58ab3 ffff88042f84aed8 ffff88042f84ad1d ffff88042f84ac30 > ffff88042f84aae0: 1ffff10085f09565 ffffffffffffffff 002088042f84abb0 ffffffff823b6600 > ffff88042f84ab00: ffffffff00000010 ffff88042f84ad00 ffffffff823b6600 ffff88042f84ac10 > ffff88042f84ab20: ffff103000001009 0000000041b58ab3 ffffffff83a40503 ffffffff823ab960 > ffff88042f84ab40: ffffffff839f498b 3832336162393630 6666666666666666 ffff88042f84ac2f > ffff88042f84ab60: ffff88042f84abb0 ffffffff823ad785 ffff88042f84ac70 0000000000000001 > ffff88042f84ab80: ffff88042f84ad2d ffff88042f84abb0 ffffffff816213e5 ffff88042f84ad2d > ffff88042f84aba0: ffffffff839f498f dffffc0000000000 ffff88042f84ac90 ffffffff823b72eb > ffff88042f84abc0: ffff88042f84afd0 ffff88042f84afd8 ffffffff839f4990 ffff88042f84acd8 > ffff88042f84abe0: 1ffff10085f09581 ffffed0085f095fb 0000000000000200 ffff88042f84aed8 > ffff88042f84ac00: 0000000000000001 0000000041b58ab3 ffffffff83a405aa ffffffff823b6ef0 > ffff88042f84ac20: ffff88042f84ac70 ffff103000001000 1ffff10085f0958a ffffffff83c88b40 > ffff88042f84ac40: ffff88042f84aeb8 ffffffff81338af4 0000000041b58ab3 ffff88042f84ac78 > ffff88042f84ac60: ffffffff811c0a51 ffff88042f84ad2e dffffc0000000000 ffff88042f84aca8 > ffff88042f84ac80: ffffffff811c0afc ffff88042f84acd8 00000000ffffffff 1ffff10085f09597 > ffff88042f84aca0: ffffffff83c88b40 ffff88042f84af20 ffffffff81338af4 0000000041b58ab3 > ffff88042f84acc0: ffffffff83a03c41 ffffffff81338a00 ffff0a00ffffff00 3430383866666666 > ffff88042f84ace0: 3063636134386632 666666666666203a 6333306133386666 6666666666203134 > ffff88042f84ad00: 3236363636363636 3333333620613330 3833333331363033 3636362036363636 > ffff88042f84ad20: 3336333032363336 1f000a3633363336 ffffffff83c88b40 ffff88042f84afb0 > ffff88042f84ad40: ffffffff81338af4 0000000041b58ab3 ffffffff83a03c41 ffffffff81338a00 > ffff88042f84ad60: 0000000041b58ab3 6177647261486401 3a656d616e206572 43206c65746e4920 > ffff88042f84ad80: 697461726f70726f 3030363253206e6f 30303632532f5a47 534f4942202c5a47 > ffff88042f84ada0: 3030364335455320 2e32302e4236382e 2e323030302e3230 3331303233323231 > ffff88042f84adc0: 2f32312030313231 0a333130322f3332 3d3d3d3d3d3d3d00 6f20646165523301 > ffff88042f84ade0: 3820657a69732066 6b73617420796220 75665f6672657020 3336382f72657a7a > ffff88042f84ae00: 5f7465675f000a38 615f6e7275746572 302b737365726464 3278302f62663178 > ffff88042f84ae20: 6461207461203032 3866666666207264 6234386632343038 000000000a306161 > ffff88042f84ae40: 0000000000000000 ... > ffff88042f84ae80: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 > ffff88042f84aea0: ffff88042f84bef8 ffffffff8342d740 ffff88042f84af68 ffff88042f84af38 > ffff88042f84aec0: ffffffff8133c807 0000000000000000 0000000000000000 0000000000000000 > ffff88042f84aee0: 0000000000000000 0000000000000000 0000000000000000 00000000ffffffff > ffff88042f84af00: 0000000000000018 ffff88042f84bef8 ffffffff839f4970 ffff88042f84afd0 > ffff88042f84af20: ffff88042f84afa0 ffffffff8133c807 0000000000000000 ffff88042f84afe8 > ffff88042f84af40: ffffffff8151fea9 0000000041b58ab3 ffffffff839ff69c ffffffff8151fdf3 > ffff88042f84af60: 0000000000000000 0000000000000000 000000002f84aff8 1ffff10085f095f6 > ffff88042f84af80: 0000000000000018 ffff88042f84bef8 ffff88040672eac0 ffff88042f84c000 > ffff88042f84afa0: ffff88042f84b050 ffffffff8151fea9 0000000041b58ab3 ffffffff839ff69c > ffff88042f84afc0: ffffffff8151fdf3 ffff88042f84b0b8 ffff880400000030 ffff88042f84b060 > ffff88042f84afe0: ffff88042f84b010 ffff88042f84bef8 ffff88040672eac0 ffff88042f84bff8 > ffff88042f84b000: ffff88042f84b028 ffffffff813b9d58 0000000000000000 ffff88042f84afe0 > ffff88042f84b020: ffff88042f84b028 ffffffff813b9d58 0000000000000000 ffff88042f84afe0 > ffff88042f84b040: ffff88042f84b020 0000000000000009 ffff88042f84b120 ffffffff811504e6 > ffff88042f84b060: ffffffff8101d21d ffffffff839fbd23 000000002f84b0a0 0000000000000020 > ffff88042f84b080: ffffffff839fbd5b ffffffff839fbd1f 0000000000000005 ffff88042f84a000 > ffff88042f84b0a0: ffff88042f84c000 ffff88042419f9b0 0000000000000001 ffff880424198000 > ffff88042f84b0c0: ffff8804241a0000 0000000000000000 0000000000000022 ffff88040672eac0 > ffff88042f84b0e0: 0000000000000000 ffff88042419f9b8 0000000000000000 0000000000000086 > ffff88042f84b100: 0000000000000000 ffff88042f84b3c8 ffffed0085f0967a dffffc0000000000 > ffff88042f84b120: ffff88042f84b130 ffffffff811505c4 ffff88042f84b150 ffffffff8238dfb3 > ffff88042f84b140: ffff88042f84b1e0 ffff88042f84baa0 ffff88042f84b1d0 ffffffff816221c1 > ffff88042f84b160: 0000000000000000 0000000000000000 ffff88042f84b1a0 0000000000000097 > ffff88042f84b180: ffff88042f84b2b8 ffff88042419f9b8 ffffed0085f09658 0000000000000010 > ffff88042f84b1a0: ffff88042f84b1f0 ffff88042f84b2b8 ffff88042f84baa0 ffff88042f84b3c8 > ffff88042f84b1c0: ffffed0085f0967a dffffc0000000000 ffff88042f84b208 ffffffff81622323 > ffff88042f84b1e0: ffff88042f84baa0 ffff88042f84baa0 0000000000000008 ffff88042f84b200 > ffff88042f84b200: ffffffff811c72cb ffff88042f84b248 ffffffff811c72cb ffff88042f84b2c8 > ffff88042f84b220: ffff88042f84b2b8 ffff88042f84b2b8 ffff88042f84b338 ffff88042f84b3c8 > ffff88042f84b240: ffffed0085f0967a ffff88042f84b360 ffffffff8100f356 0000000000000000 > ffff88042f84b260: 0000000000000000 1ffff10085f09650 ffff88042f84b3d4 1ffff10085f09653 > ffff88042f84b280: ffff88042f84b3da 0000000000000004 ffff88042f84b3d0 0000000041b58ab3 > ffff88042f84b2a0: ffffffff839f613c ffffffff8100f000 ffffed0085f096a6 0000000000000005 > ffff88042f84b2c0: ffff88042f84a000 ffff88042f84c000 ffff88042419f9b0 0000000000000020 > ffff88042f84b2e0: ffff88040672eac0 0000000000000000 ffff88042f84ba98 0000000000000000 > ffff88042f84b300: ffff88042f84b380 ffffffff823bbf3c 0000000000000000 0000000000000000 > ffff88042f84b320: 0000000000000000 ffff88042f84b548 ffff88042f84b530 000000000001bdc0 > ffff88042f84b340: ffff88042f84b408 ffff8804222eadc0 1ffff10085f09675 ffff8804222eadc0 > ffff88042f84b360: ffff88042f84b430 ffffffff81513f16 0000000000000007 ffffffff811c0a34 > ffff88042f84b380: ffff880400000000 ffff88042f84b6e0 0000000000000000 ffff880400000001 > ffff88042f84b3a0: 000000000000000c 0000000041b58ab3 ffffffff83a0a369 ffffffff81513ca0 > ffff88042f84b3c0: ffff88042f84b3e8 ffff8804222eadc0 000000010000007f ffff88042f000001 > ffff88042f84b3e0: ffffffff811c0a2d ffff88042f84b410 ffffffff823bccda 00000000000021be > ffff88042f84b400: 0000000000000000 ffff88072594aa80 0000000000000040 ffff88042f84b6e0 > ffff88042f84b420: ffff880419217c00 0000000000000000 ffff88042f84b478 ffffffff81514438 > ffff88042f84b440: ffffffff00000001 ffffffff811c0a2d ffff88042f84b51c ffff88072594aa80 > ffff88042f84b460: ffff88042f84b518 ffff88072594aa80 ffff88042f84b7c0 ffff88042f84b4e8 > ffff88042f84b480: ffffffff8150ac7e ffff88042f84b5b0 ffffffff81026e69 ffff88042f84b6e0 > ffff88042f84b4a0: 1ffff10085f09699 00000000000000a3 ffff88042f84b51e ffff88042f84b6e0 > ffff88042f84b4c0: 1ffff10085f0969f ffff88072594aa80 ffff88042f84b7c0 ffff88042f84b6e0 > ffff88042f84b4e0: ffff88042f84b6e0 ffff88042f84b5d8 ffffffff8150b5b3 0000000041b58ab3 > ffff88042f84b500: ffffffff83a0d7b0 ffffffff8150b520 0000000100000000 0020400100000009 > ffff88042f84b520: 0000000100000000 0000000000000000 0107080800004000 ffffffff811c0a2d > ffff88042f84b540: ffffffff811c0a34 ffffffff811c0a34 0000000000000000 0000000000000000 > ffff88042f84b560: 0000000000000000 ffff88072594aa80 ffff88072594aa80 ffff88042f84b7c0 > ffff88042f84b580: 000000000000464d ffff88042f84b5d8 ffffffff812c58ec ffff88042f84b7c0 > ffff88042f84b5a0: ffff88072594aa80 00000000000000a3 ffff88072594aa80 ffff88072594aa80 > ffff88042f84b5c0: ffff88042f84b7c0 ffff88072594ad74 0000000000000000 ffff88042f84b620 > ffff88042f84b5e0: ffffffff814e7c13 ffff88042f84b7d0 ffff880400000000 ffff88072594aa80 > ffff88042f84b600: dffffc0000000000 ffff88042c7e00b0 ffff88042f84b6e0 ffff88042f84b7c0 > ffff88042f84b620: ffff88042f84b630 ffffffff8150cb54 ffff88042f84b9b0 ffffffff8102901a > ffff88042f84b640: 0000000000000000 ... > ffff88042f84b660: 0000000000000000 1ffff10085f096d8 0000000000000000 0000000000000000 > ffff88042f84b680: 0000000000000000 0000000000000000 ffff88042f84b7c0 ffff88042f84bef8 > ffff88042f84b6a0: ffff88072594aa80 0000000000000000 0000000000000000 ffff88042f84b6e0 > ffff88042f84b6c0: 0000000041b58ab3 ffffffff839f20b0 ffffffff81028c50 0000000000000000 > ffff88042f84b6e0: 0000000000000002 0000000000000000 dffffc0000000000 000000070000000f > ffff88042f84b700: ffff88042f84ba98 ffff88072594aa80 1ffff10085f0a6ec 00000000ffffffff > ffff88042f84b720: ffffed0085f0a6ca 00000000000004c1 0000000000000000 000000000000038f > ffff88042f84b740: 1ffff10085f0a6c8 0000000000000000 ffff88042f853640 ffffffffffffffff > ffff88042f84b760: ffffffff811c0a2d 0000000000000010 000000000000000e ffff88042f84ba88 > ffff88042f84b780: 0000000000000018 ffffffff839f2108 ffffffff8102b200 0000000000000000 > ffff88042f84b7a0: 0000000000000000 ... > ffff88042f84b7c0: 0000000000000000 0000000000000000 0000000000000000 000000000000090f > ffff88042f84b7e0: 0000000000000000 0000000000000000 0000000005080021 00000000000000a3 > ffff88042f84b800: ffffffff811c0a2d 000021be000021be 0000000000000000 0000000000000000 > ffff88042f84b820: 0000000000000000 0000000000000001 ffff88042f84b8a8 ffffffff823bb28d > ffff88042f84b840: 0000000000000000 ... > ffff88042f84b860: ffff88042f84b9c0 ffff88042f84ba18 ffff88042f84ba20 ffff88042f84b974 > ffff88042f84b880: ffff88042f84b9c4 ffff88042f84b9c0 ffff88042f84ba60 0000000000000002 > ffff88042f84b8a0: ffff88042f84b9c4 ffff88042f84b928 ffffffff823bbf3c ffffffff823ac07c > ffff88042f84b8c0: ffff88042f84b9c0 ffff88042f84b9c0 ffff88042f84ba20 ffff88042f84ba08 > ffff88042f84b8e0: 0000000000000068 ffff88042f84b910 ffff88042f84b9d0 ffff88042f84ba18 > ffff88042f84b900: ffff88042f84b9c0 ffff88042f84b9c0 ffff88042f84ba60 0000000000000002 > ffff88042f84b920: 0000000000000002 ffff88042f84b940 ffffffff823beb42 1ffff10085f0972c > ffff88042f84b940: ffff88042f84ba88 ffffffff8102cf02 ffffffff83a40503 ffffffff823ab960 > ffff88042f84b960: 0000000041b58ab3 ffffffff839f711e ffffffff8102cde0 0000000000000000 > ffff88042f84b980: 0000000000000000 0000000000000000 dffffc0000000000 ffff88042f84bb08 > ffff88042f84b9a0: ffff88072594aa80 ffff88042f853440 ffff88042f84bb30 ffffffff81029856 > ffff88042f84b9c0: 0000000100000000 0000000100000000 ffff88042f853d78 ffff88042f84bef8 > ffff88042f84b9e0: 1ffff10085f09745 ffff88042c7e0000 ffff88042f84ba88 0000000000000007 > ffff88042f84ba00: ffffed0085f0a7af ffff88042c7e00b0 fffffbfff082adbc ffff88042f84bac8 > ffff88042f84ba20: ffff88042f84ba88 0000000041b58ab3 ffffffff839f20d0 ffffffff81029260 > ffff88042f84ba40: 0000000000000000 0000000000000001 0000000000000000 0000000000000000 > ffff88042f84ba60: ffff88042f853f00 000000000000000f ffff88042f853440 dffffc0000000000 > ffff88042f84ba80: 000000000000000f 0000000000000001 0000000000000000 ffff88042f84bac8 > ffff88042f84baa0: ffffffff811c0afc fffffbfff082adc4 00000003ffffffff 1ffff10085f0975b > ffff88042f84bac0: ffffffff83c88b40 0000000000000000 0000000000000000 ffff88042f853d90 > ffff88042f84bae0: ffffffff00000000 ffffffff00029ffe 0000000000000000 ffffed0085f0a7b2 > ffff88042f84bb00: ffff88042f853f10 0000000000000001 000000c76b33c80d ffffffff83c16120 > ffff88042f84bb20: 000000c76b33c7fa ffff88042f853440 ffff88042f84bdf8 ffffffff8101e752 > ffff88042f84bb40: ffff88042f853d78 1ffff10085f09770 ffffed0085f0a7af 0000006400000000 > ffff88042f84bb60: 0000000000000000 ffff88042f84bef8 0000000000000000 ffff88042f84bd60 > ffff88042f84bb80: 0000000041b58ab3 ffffffff839f1dd0 ffffffff8101e2a0 ffff88042f84bc40 > ffff88042f84bba0: ffffffff8256fd3e ffffc900000c5000 1ffff10085f09777 0000000041b58ab3 > ffff88042f84bbc0: 0000000000000000 ffffffff8256fb16 0000000000000000 0000000000000000 > ffff88042f84bbe0: 0000000000000000 ... > ffff88042f84bc00: 0000000000000000 0000000000000000 0000000000000000 1ffff10085f0978a > ffff88042f84bc20: ffff88042f84bcf0 ffffc900000cff94 ffff88042f84bd60 dffffc0000000000 > ffff88042f84bc40: ffff88072ec02000 ffff88042f84bcb8 ffffffff815e0639 ffff88072ec02000 > ffff88042f84bc60: ffff88042f62d000 ffffc900000e9fff ffffc900000ea000 ffffffff83c0bc98 > ffff88042f84bc80: ffffc900000e9fff ffffc900000ea000 ffffc900000e9000 0000000000000000 > ffff88042f84bca0: ffff88072951f4e0 00000000bdceb03c ffff880423ef2214 ffff88042f84bcc8 > ffff88042f84bcc0: ffffc900000e9000 ffff88042f84bd18 ffffffff82609379 0000000000000014 > ffff88042f84bce0: 0000000000000000 0010000000000001 ffff8807294f4300 1ffff10085f097a8 > ffff88042f84bd00: ffffc900000cff80 ffff88042f84bda0 0000000000000001 ffff88042f84bdc8 > ffff88042f84bd20: ffffffff826095be ffffffff83c16120 000000c76aa445a8 ffff8807294f4308 > ffff88042f84bd40: 0000000041b58ab3 ffffffff83a49886 ffffffff826094a0 ffffffff83a03c64 > ffff88042f84bd60: 00000000bdceb028 0000000000000000 0000000000000020 ffff88042f84bdf8 > ffff88042f84bd80: ffff88042f84bdb0 ffff88042f84bdb0 ffffffff84c270c0 dffffc0000000000 > ffff88042f84bda0: ffff8807294f4300 dffffc0000000000 ffffffff83f6e7c0 0000000000000000 > ffff88042f84bdc0: ffffffff83f6ea20 ffff88042f84be18 ffff88042f84bef8 000000c76b33c80d > ffff88042f84bde0: ffffffff83c16120 000000c76b33c7fa ffffffff83c16130 ffff88042f84be18 > ffff88042f84be00: ffffffff8100a25d dffffc0000000000 0000000000000001 ffff88042f84be80 > ffff88042f84be20: ffffffff81150f5e 0000000000000000 0000000000000000 ffff88042f84bef8 > ffff88042f84be40: 0000000000000000 ffffffff83c64ce8 00000000000004a1 ffff88042f84bef8 > ffff88042f84be60: 0000000000000001 0000000000000007 ffff88040672f23c ffff88042f84bf90 > ffff88042f84be80: ffff88042f84bea8 ffffffff81151b41 ffff88040672eac0 ffff88042f84bef8 > ffff88042f84bea0: ffff88040672eac0 ffff88042f84bee8 ffffffff81151d52 0000000000000000 > ffff88042f84bec0: 0000000000000001 000000070000000f dffffc0000000000 0000000000000000 > ffff88042f84bee0: 0000000000000002 ffff88042f84bef9 ffffffff832ad08e 0000000000000002 > ffff88042f84bf00: 0000000000000000 dffffc0000000000 000000070000000f ffff88042419f9b8 > ffff88042f84bf20: ffff88072594aa80 1ffff10085f0a6ec 00000000ffffffff ffffed0085f0a6ca > ffff88042f84bf40: 00000000000004c1 0000000000000000 000000000000038f 1ffff10085f0a6c8 > ffff88042f84bf60: 0000000000000000 ffff88042f853640 ffffffffffffffff ffffffff8101d21d > ffff88042f84bf80: 0000000000000010 0000000000000046 ffff88042419f9b0 0000000000000018 > ffff88042f84bfa0: ffffffff8101d21d 0000000000000010 0000000000000046 ffff88042419f9b0 > ffff88042f84bfc0: 0000000000000018 0000000000000001 1ffff10085f0a6c8 ffffffff8101d21d > ffff88042f84bfe0: 0000000000000010 0000000000000046 ffff88042419f9b0 0000000000000018 > d intel_pmu_enable_all+0x10/0x20 > d x86_pmu_enable+0x65e/0xb10 > d ? ctx_sched_in+0xe8c/0x15a0 > d perf_pmu_enable.part.97+0x29/0x40 > d ctx_resched+0x147/0x1a0 > d __perf_event_enable+0x714/0xb60 > d ? wp_page_copy+0x857/0x13f0 > d ? perf_mux_hrtimer_handler+0x670/0x670 > d event_function+0x1de/0x380 > d ? cpu_clock_event_read+0x30/0x30 > d ? perf_cgroup_attach+0xb0/0xb0 > d remote_function+0xfe/0x180 > d generic_exec_single+0x1a3/0x300 > d ? perf_cgroup_attach+0xb0/0xb0 > d smp_call_function_single+0x1b2/0x310 > d ? generic_exec_single+0x300/0x300 > d ? generic_exec_single+0x113/0x300 > d ? vm_normal_page+0x170/0x170 > d task_function_call+0xb1/0x100 > d ? perf_event_addr_filters_exec+0x360/0x360 > d ? cpu_clock_event_read+0x30/0x30 > d event_function_call+0x1ac/0x2e0 > d ? perf_mux_hrtimer_handler+0x670/0x670 > d ? task_function_call+0x100/0x100 > d ? perf_mux_hrtimer_handler+0x670/0x670 > d ? cpu_clock_event_read+0x30/0x30 > d ? do_vfs_ioctl+0x192/0xf00 > d ? _perf_event_disable+0xa0/0xa0 > d _perf_event_enable+0x8f/0xc0 > d perf_event_for_each_child+0x83/0x160 > d perf_event_task_enable+0x8b/0x100 > d SyS_prctl+0x761/0xb20 > d ? SyS_umask+0x60/0x60 > d ? trace_hardirqs_on_thunk+0x1a/0x1c > d entry_SYSCALL_64_fastpath+0x18/0xa8 > dRIP: 0033:0x7f382ac68a4a > dRSP: 002b:00007ffc0d8588e8 EFLAGS: 00000202c ORIG_RAX: 000000000000009d > dRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f382ac68a4a > dRDX: 0000000000000001 RSI: 00007ffc0d8588cc RDI: 0000000000000020 > dRBP: 00007ffc0d858900 R08: 00007f382af1c0a4 R09: 00007f382af1c120 > dR10: 00007f382af1c0a4 R11: 0000000000000202 R12: 0000000000401810 > dR13: 00007ffc0d85ac80 R14: 0000000000000000 R15: 0000000000000000 > ffff880424198000: 0000000057ac6e9d 0000000000000000 0000000000000000 0000000000000000 > ffff880424198020: 0000000000000000 ... > ffff880424198820: 0000000000000000 0000000000000000 c66000d000000001 c80000d000000001 > ffff880424198840: 0000000000000000 ... > ffff8804241988a0: 0000000000000000 0000000000000000 ffff880424198000 0000000000000000 > ffff8804241988c0: 0000000000000000 ... > ffff8804241990e0: c66000d000000001 c80000d000000001 0000000000000000 0000000000000000 > ffff880424199100: 0000000000000000 ... > ffff880424199160: ffff8804241988b0 0000000000000000 0000000000000000 0000000000000000 > ffff880424199180: 0000000000000000 ... > ffff880424199980: 0000000000000000 0000000000000000 c66000d000000001 c80000d000000001 > ffff8804241999a0: 0000000000000000 ... > ffff880424199a00: 0000000000000000 0000000000000000 ffff880424199160 0000000000000000 > ffff880424199a20: 0000000000000000 ... > ffff88042419a240: c66000d000000001 c80000d000000001 0000000000000000 0000000000000000 > ffff88042419a260: 0000000000000000 ... > ffff88042419a2c0: ffff880424199a10 0000000000000000 0000000000000000 0000000000000000 > ffff88042419a2e0: 0000000000000000 ... > ffff88042419aae0: 0000000000000000 0000000000000000 c66000d000000001 c80000d000000001 > ffff88042419ab00: 0000000000000000 ... > ffff88042419ab60: 0000000000000000 0000000000000000 ffff88042419a2c0 0000000000000000 > ffff88042419ab80: 0000000000000000 ... > ffff88042419b3a0: c1c000d000000001 c36000d000000001 0000000000000000 0000000000000000 > ffff88042419b3c0: 0000000000000000 ... > ffff88042419b420: ffff88042419ab70 0000000000000000 0000000000000000 0000000000000000 > ffff88042419b440: 0000000000000000 ... > ffff88042419bc40: 0000000000000000 0000000000000000 c66000d000000001 c80000d000000001 > ffff88042419bc60: 0000000000000000 ... > ffff88042419bcc0: 0000000000000000 0000000000000000 ffff88042419b420 0000000000000000 > ffff88042419bce0: 0000000000000000 ... > ffff88042419c500: c66000d000000001 c80000d000000001 0000000000000000 0000000000000000 > ffff88042419c520: 0000000000000000 ... > ffff88042419c580: ffff88042419bcd0 0000000000000000 0000000000000000 0000000000000000 > ffff88042419c5a0: 0000000000000000 ... > ffff88042419cda0: 0000000000000000 0000000000000000 c66000d000000001 c80000d000000001 > ffff88042419cdc0: 0000000000000000 ... > ffff88042419ce20: 0000000000000000 0000000000000000 ffff88042419c580 0000000000000000 > ffff88042419ce40: 0000000000000000 ... > ffff88042419d660: c66000d000000001 c80000d000000001 0000000000000000 0000000000000000 > ffff88042419d680: 0000000000000000 ... > ffff88042419d6e0: ffff88042419ce30 0000000000000000 0000000000000000 0000000000000000 > ffff88042419d700: 0000000000000000 ... > ffff88042419dec0: 0000000000000000 0000000000000000 0000000000000000 ffff880424190090 > ffff88042419dee0: ffff880423db0098 dffffc0000000000 ffff880424190080 ffffed008483201a > ffff88042419df00: ffff88042419df60 ffffffff812c8399 c66000d000000001 c80000d000000001 > ffff88042419df20: 0000000000000000 ffff880423db0080 ffff880423db0090 ffff88042fca0de8 > ffff88042419df40: ffff88042fca0eb0 ffff88042fca0e18 ffff88042419dff8 ffffffff812e90f7 > ffff88042419df60: ffff88042419dff8 ffffffff812e2eae 0000000000000000 0000000000000000 > ffff88042419df80: 0000000000000000 0000000000000000 ffff88042fca0de8 ffff880423db0080 > ffff88042419dfa0: ffff880423db0080 ffff880423db0080 ffff88042fca0e28 ffff880424190210 > ffff88042419dfc0: ffff88042fca0eb0 0000000000000000 ffff880423db0000 ffff880423db0080 > ffff88042419dfe0: dffffc0000000000 ffff880424190080 ffff88042fca0d80 ffff88042419e110 > ffff88042419e000: ffffffff812fb6d1 ffff88042fca16b0 ffff88042fca0de8 1ffff10084833c11 > ffff88042419e020: 0000000000000000 0000000000000000 0000000000000000 ffffed0085f942d6 > ffff88042419e040: ffff88042fca0df8 0000000000000000 ffff880424190000 0000000000000000 > ffff88042419e060: 0000000000000000 0000000000000000 0000000000000000 ffff880424190b40 > ffff88042419e080: 1ffff10084833c11 0000000041b58ab3 ffffffff839fba92 ffffffff81144cf0 > ffff88042419e0a0: 0000000000000000 ffff88042419e198 ffff88042419e190 ffff88042419e1f8 > ffff88042419e0c0: 0000000000000001 ffff88042419e1f8 ffff88042419e1d0 ffff88042419e130 > ffff88042419e0e0: ffffffff811c75da ffff88042fca0d80 0000000000000000 ffff88042419e198 > ffff88042419e100: ffff88042419e190 ffff88042419ff48 0000000000000001 ffff88042419ff48 > ffff88042419e120: 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0000000000000001 000000000000000c > ffff88042419f200: 000000000000000c 0000000000000000 0000000000002e04 000000000000022c > ffff88042419f220: 0000001400000000 0000000000000014 0000000000000000 0000000000000000 > ffff88042419f240: ffff88042419f250 ffff880709a1d018 ffff88042419f2a0 ffffffff81448fa2 > ffff88042419f260: 0000000000000050 ffff880709a1d018 ffff88042419f2c0 ffffffff81448fa2 > ffff88042419f280: ffff8800032b6000 ffff880709a1d028 ffffffff811d236d 80000000032b6161 > ffff88042419f2a0: ffff880709a1d018 ffff88042419f2f8 ffffffff81448fa2 ffff880709a1d018 > ffff88042419f2c0: 0000000041b58ab3 ffffffff83a0d680 ffffffff814e3680 dffffc0000000000 > ffff88042419f2e0: 0000000000000012 ffff88042419f538 ffff880400000001 1ffff10084833e60 > ffff88042419f300: 0000000041b58ab3 ffffffff83a0dbdc ffffffff815397d0 ffffffff832ad2e7 > ffff88042419f320: ffffffff814e3bf8 ffff88042419f4c0 ffff8804298a91fa ffff88042419f4a0 > ffff88042419f340: ffff88042419f6a8 0000000000314e86 0000000000000020 0000000000000028 > ffff88042419f360: ffffffff81621106 0000000000000000 dffffc0000000000 ffff88042419f388 > ffff88042419f380: ffffffff81621428 ffff88042419f470 ffffffff8153ccb5 ffff880709a1d028 > ffff88042419f3a0: ffffffff81510c31 0000000000000008 ffffffff81621106 0000000000000001 > ffff88042419f3c0: dffffc0000000000 ffff88042419f3d8 ffffffff81621428 ffff88042419f4c0 > ffff88042419f3e0: ffffffff8153ccb5 ffff88043fffd010 0000000000000040 ffff88042f9a48e8 > ffff88042419f400: ffff88043fffcb80 ffff88042419f4f8 ffffea00102b0e40 0000000000000246 > ffff88042419f420: 024200ca00000001 ffff88042419f558 ffffed0084833ea1 0000000100000000 > ffff88042419f440: 0000000000000040 0000000000000000 ffff88083fff9b80 ffff88042419f548 > ffff88042419f460: ffffea001cbcdd40 0000000000000246 024200ca00000001 0000000000000000 > ffff88042419f480: ffffed0084833eab 0000000100000000 ffff88083fffa700 0000000000000000 > ffff88042419f4a0: 00000000024200ca ffff88042419f538 00000000024200ca ffff88042419f598 > 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ffffffff839f60d6 ffffffff81009250 ffffffff8101a831 0000000200000005 > ffff88042419f640: 0000000000000002 ffff88042f853b60 0000000000000005 0000000000000021 > ffff88042419f660: 0000000000000001 0000000200000001 0000000000000000 0000000000000000 > ffff88042419f680: 0000000000000000 ... > ffff88042419f6a0: 0000000000000000 0000000000000000 ffff88042419f700 ffffffff8101c610 > ffff88042419f6c0: ffff880400000001 ffff880700000001 ffff880700000040 0000000000000000 > ffff88042419f6e0: ffff88042419f700 ffffffff810191fa dffffc0000000000 ffff88042419f828 > ffff88042419f700: ffff88042419f7e8 ffffffff8100cac2 ffff88072594aa80 ffff880419217c00 > ffff88042419f720: 1ffffffff082adc1 0000000000029ffe 1ffff10084833eec ffff88042f853b60 > ffff88042419f740: ffff880700000002 ffff880400000000 ffff88042419f820 ffff88042f853440 > ffff88042419f760: 0000000041b58ab3 ffffffff839f6109 ffffffff8100c720 ffff88042f853440 > ffff88042419f780: 0000000200000000 ffffffff81009e18 0000000100000000 0000000041b58ab3 > ffff88042419f7a0: ffffffff839f60e8 ffffffff81009c50 0000000000000008 ffff88042f853660 > ffff88042419f7c0: ffff88042419f7e8 ffffffff816213e5 ffff88042f853440 ffff88042f853440 > ffff88042419f7e0: 1ffff10084833f00 ffff88042419f968 ffffffff81009b68 ffffffff83c167c0 > ffff88042419f800: 0000000041b58ab3 ffffffff839f60e8 ffffffff810099d0 ffff88042419f9b0 > ffff88042419f820: 0000000000000021 ffffed0084833f21 000000007fffffff ffff8804a419f9af > ffff88042419f840: ffffffff81621106 0000000000000000 dffffc0000000000 ffff88042419f868 > ffff88042419f860: ffffffff81621428 ffff88042419f950 ffffffff8153ccb5 1ffff10084833f1c > ffff88042419f880: 0000000000000001 0000000000000000 ffff88042419fd60 ffff88042419f9c0 > ffff88042419f8a0: ffff88042c3f8168 ffff88042c3f8000 0000000000000000 ffff88042419f918 > ffff88042419f8c0: ffffffff814ffc80 0000000000000021 ffff88042419f918 ffff88072594ab08 > ffff88042419f8e0: ffff88072594aa80 0000000000000000 ffff88042419f950 ffffffff814ffc80 > ffff88042419f900: ffff88042419f968 0000000000000082 0000000000000000 ffff88042419f978 > ffff88042419f920: ffff88072594aa80 0000000000000000 ffff88042419f990 ffffffff814ffc80 > ffff88042419f940: ffff88072594abd8 0000000000000001 ffff88042419f990 ffffffff8101e082 > ffff88042419f960: dffffc0000000000 ffff88042f853648 0000000000000000 ffff88072594ac40 > ffff88042419f980: ffff88042f853440 0000000000000000 dffffc0000000000 ffff88042419f9b8 > ffff88042419f9a0: ffffffff8101d12c ffff88072594aa80 ffff88042f853440 ffff88042419f9c8 > ffff88042419f9c0: ffffffff8101d2a0 ffff88042419fa60 ffffffff8100de4e ffff88042419fa50 > ffff88042419f9e0: ffffffff814f793c 00000001812c58ec ffff88042f864f08 ffff880419217c00 > ffff88042419fa00: ffffed0085f0c9fe ffff88042f853654 ffff88042f853658 ffffed0085f0a6ca > ffff88042419fa20: ffff88042f853650 0000000000000002 ffff88040672ea07 ffffffff83c167c0 > ffff88042419fa40: ffffffff83c167c0 ffff880419217c00 ffffffff83c167c0 ffff88072594aa80 > ffff88042419fa60: ffff88042419fa78 ffffffff814eaff9 ffff88042f864f00 ffff88042419faa8 > ffff88042419fa80: ffffffff814f8217 ffff880419217c00 ffff880419217c00 ffff88042f864f08 > ffff88042419faa0: dffffc0000000000 ffff88042419fb00 ffffffff814f92a4 ffff88070972d458 > ffff88042419fac0: ffff88042419fe40 ffff88072594aaa0 ffffffff815af787 ffff88042f864f08 > ffff88042419fae0: ffff880419217c00 ffff880419217c00 ffff88072594aa80 ffffffff814f8b90 > ffff88042419fb00: ffff88042419fb48 ffffffff814e1b2e ffff88042419fd70 ffff88042f864f10 > ffff88042419fb20: ffff88042419fca0 ffffffff814e1950 ffff88042419fcb8 0000000000000001 > ffff88042419fb40: ffffffff814e6a70 ffff88042419fb78 ffffffff814e6b6e ffff88042419fb78 > ffff88042419fb60: 0000000000000246 ffff88042419fc18 1ffff10084833f7c ffff88042419fbb8 > ffff88042419fb80: ffffffff813b1163 ffff88042419fca0 ffffffff814e6a70 ffff88042419fc40 > ffff88042419fba0: 0000000000000007 1ffff10084833f7c 0000000000000001 ffff88042419fc68 > ffff88042419fbc0: ffffffff813b1472 ffff88042419fbf8 0000000000000246 ffffffff83a77980 > ffff88042419fbe0: 0000000041b58ab3 ffffffff83a05fdf ffffffff813b12c0 ffff88042419fc18 > ffff88042419fc00: 0000000000000000 ... > ffff88042419fc20: ffffffff813b10d3 ffffffff815b1920 1ffff10084833f88 ffff88042419fce0 > ffff88042419fc40: ffffed0080ce5d5e 0000000000000007 ffff88042419fce0 1ffff10084833f90 > ffff88042419fc60: ffff88040672eac0 ffff88042419fd08 ffffffff814e25e1 ffff88040672eaf4 > ffff88042419fc80: 0000000041b58ab3 ffffffff839ff26b ffffffff814e2530 0000000000000000 > ffff88042419fca0: ffff88040672eac0 ffffffff814e1950 ffff88042419fd70 00000000fffffffd > ffff88042419fcc0: ffff88042419fda0 00007ffc0d8588d0 0000000040082404 ffff88070972d458 > ffff88042419fce0: ffff880419217c00 ffffed0083242f8f ffff88040672eac0 dffffc0000000000 > ffff88042419fd00: ffff88072594aca8 ffff88042419fe18 ffffffff814e27dc ffff880419217c78 > ffff88042419fd20: 1ffff10084833faa 0000000000000000 ffffffff814f8b90 ffff88072594aa80 > ffff88042419fd40: ffff880419217c90 ffff88042419fd70 0000000041b58ab3 ffffffff83a0a00b > ffff88042419fd60: ffffffff814e2630 ffffffff83a12428 ffff88072594aa80 ffffffff814f8b90 > ffff88042419fd80: 0000000000000000 0000000000000000 0000000041b58ab3 ffffffff83a142a0 > ffff88042419fda0: ffff88070c3a8a00 1ffff10084833fc0 0000000000000000 ffffffff814e1950 > ffff88042419fdc0: ffff88042419fd70 ffff880400000000 ffffffff81694cc2 ffff88042419fe10 > ffff88042419fde0: ffff88041ed2b600 ffff8807282b0020 ffff88072594aa80 ffff880419217c08 > ffff88042419fe00: ffffffff814e29b0 dffffc0000000000 ffff88072594aca8 ffff88042419fe38 > ffff88042419fe20: ffffffff814e2a3f ffff880419217c00 ffff88072594aa80 ffff88042419fe70 > ffff88042419fe40: ffffffff814e1d53 ffff88072594aa80 ffff880419217c00 ffff88040672f378 > ffff88042419fe60: dffffc0000000000 00007f382af1c0a4 ffff88042419fea0 ffffffff814ff76b > ffff88042419fe80: 0000000000000001 1ffff10084833fd8 00007ffc0d8588cc 0000000000000020 > ffff88042419fea0: ffff88042419ff48 ffffffff8126fb41 00007f382af1c0a4 ffff88040672eac0 > ffff88042419fec0: 0000000041b58ab3 ffffffff83a00b7c ffffffff8126f3e0 ffff88040672eac0 > ffff88042419fee0: 0000000000000000 0000000000000008 ffff88070972d458 ffffffff8100201a > ffff88042419ff00: ffff88040672eac0 00007f382af1c0a4 00007f382af1c120 00007f382af1c0a4 > ffff88042419ff20: 0000000000000000 0000000000401810 00007ffc0d85ac80 0000000000000000 > ffff88042419ff40: 0000000000000000 00007ffc0d858900 ffffffff832abc2a 0000000000000000 > ffff88042419ff60: 0000000000000000 00007ffc0d85ac80 0000000000401810 00007ffc0d858900 > ffff88042419ff80: 0000000000000000 0000000000000202 00007f382af1c0a4 00007f382af1c120 > ffff88042419ffa0: 00007f382af1c0a4 ffffffffffffffda 00007f382ac68a4a 0000000000000001 > ffff88042419ffc0: 00007ffc0d8588cc 0000000000000020 000000000000009d 00007f382ac68a4a > ffff88042419ffe0: 0000000000000033 0000000000000202 00007ffc0d8588e8 000000000000002b > 3Memory state around the buggy address: > 3 ffff88042f84b980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3 ffff88042f84ba00: 00 00 00 00 00 f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 > 3>ffff88042f84ba80: f2 00 00 f4 f4 f2 f2 f2 f2 00 00 f4 f4 f3 f3 f3 > 3 ^ > 3 ffff88042f84bb00: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 3 ffff88042f84bb80: f1 f1 f1 f1 f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 f2 > 3================================================================== Just in case, there is currently a known KASAN false positive related to longjmp's on GPFs. When a syscall hits GPF stack is unwound to kernel entry point, this leaves a bunch of stray poisoned redzones on the thread stack. They later cause false stack-out-of-bounds reports. But this does not seem to be the case here. Kernel is not tainted. And shadow at the bottom of the reports looks sane. But if that's the case somehow, we will need to add kasan_unpoison_remaining_stack() call before a longjmp like we did for jprobe_return(): https://groups.google.com/d/msg/kasan-dev/Hzox58yZ4MU/TOdFoWMuBQAJ ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 9:48 ` Dmitry Vyukov @ 2016-11-17 14:01 ` Josh Poimboeuf 2016-11-17 14:25 ` Vince Weaver 0 siblings, 1 reply; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-17 14:01 UTC (permalink / raw) To: Dmitry Vyukov Cc: Peter Zijlstra, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, Stephane Eranian On Thu, Nov 17, 2016 at 10:48:27AM +0100, Dmitry Vyukov wrote: > Just in case, there is currently a known KASAN false positive related > to longjmp's on GPFs. When a syscall hits GPF stack is unwound to > kernel entry point, this leaves a bunch of stray poisoned redzones on > the thread stack. They later cause false stack-out-of-bounds reports. > > But this does not seem to be the case here. Kernel is not tainted. And > shadow at the bottom of the reports looks sane. > > But if that's the case somehow, we will need to add > kasan_unpoison_remaining_stack() call before a longjmp like we did for > jprobe_return(): > https://groups.google.com/d/msg/kasan-dev/Hzox58yZ4MU/TOdFoWMuBQAJ I'm pretty sure this isn't a KASAN false positive. The unwinder does actually seem to be accessing a bad area of the stack, in the middle of a function's stack frame. -- Josh ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 14:01 ` Josh Poimboeuf @ 2016-11-17 14:25 ` Vince Weaver 2016-11-17 14:36 ` Josh Poimboeuf 0 siblings, 1 reply; 33+ messages in thread From: Vince Weaver @ 2016-11-17 14:25 UTC (permalink / raw) To: Josh Poimboeuf Cc: Dmitry Vyukov, Peter Zijlstra, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, Stephane Eranian On Thu, 17 Nov 2016, Josh Poimboeuf wrote: > On Thu, Nov 17, 2016 at 10:48:27AM +0100, Dmitry Vyukov wrote: > > Just in case, there is currently a known KASAN false positive related > > to longjmp's on GPFs. When a syscall hits GPF stack is unwound to > > kernel entry point, this leaves a bunch of stray poisoned redzones on > > the thread stack. They later cause false stack-out-of-bounds reports. > > > > But this does not seem to be the case here. Kernel is not tainted. And > > shadow at the bottom of the reports looks sane. > > > > But if that's the case somehow, we will need to add > > kasan_unpoison_remaining_stack() call before a longjmp like we did for > > jprobe_return(): > > https://groups.google.com/d/msg/kasan-dev/Hzox58yZ4MU/TOdFoWMuBQAJ > > I'm pretty sure this isn't a KASAN false positive. The unwinder does > actually seem to be accessing a bad area of the stack, in the middle of > a function's stack frame. I'm having trouble reproducing it on a few other machines I have fuzzing. So there might be some kernel option contributing, I need to compare .configs. Also the machine that easily triggers the problem I'm compiling with gcc-5.4 where the machines I can't are using gcc-4.9. Vince ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 14:25 ` Vince Weaver @ 2016-11-17 14:36 ` Josh Poimboeuf 2016-11-17 14:58 ` Dmitry Vyukov 0 siblings, 1 reply; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-17 14:36 UTC (permalink / raw) To: Vince Weaver Cc: Dmitry Vyukov, Peter Zijlstra, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, Stephane Eranian On Thu, Nov 17, 2016 at 09:25:58AM -0500, Vince Weaver wrote: > On Thu, 17 Nov 2016, Josh Poimboeuf wrote: > > > On Thu, Nov 17, 2016 at 10:48:27AM +0100, Dmitry Vyukov wrote: > > > Just in case, there is currently a known KASAN false positive related > > > to longjmp's on GPFs. When a syscall hits GPF stack is unwound to > > > kernel entry point, this leaves a bunch of stray poisoned redzones on > > > the thread stack. They later cause false stack-out-of-bounds reports. > > > > > > But this does not seem to be the case here. Kernel is not tainted. And > > > shadow at the bottom of the reports looks sane. > > > > > > But if that's the case somehow, we will need to add > > > kasan_unpoison_remaining_stack() call before a longjmp like we did for > > > jprobe_return(): > > > https://groups.google.com/d/msg/kasan-dev/Hzox58yZ4MU/TOdFoWMuBQAJ > > > > I'm pretty sure this isn't a KASAN false positive. The unwinder does > > actually seem to be accessing a bad area of the stack, in the middle of > > a function's stack frame. > > I'm having trouble reproducing it on a few other machines I have fuzzing. > So there might be some kernel option contributing, I need to compare > .configs. > > Also the machine that easily triggers the problem I'm compiling with > gcc-5.4 where the machines I can't are using gcc-4.9. I believe KASAN only works with gcc 5 and later, so that would explain why you aren't seeing it with gcc 4.9. -- Josh ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 14:36 ` Josh Poimboeuf @ 2016-11-17 14:58 ` Dmitry Vyukov 2016-11-17 17:15 ` Vince Weaver 0 siblings, 1 reply; 33+ messages in thread From: Dmitry Vyukov @ 2016-11-17 14:58 UTC (permalink / raw) To: Josh Poimboeuf Cc: Vince Weaver, Peter Zijlstra, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, Stephane Eranian On Thu, Nov 17, 2016 at 3:36 PM, Josh Poimboeuf <jpoimboe@redhat.com> wrote: > On Thu, Nov 17, 2016 at 09:25:58AM -0500, Vince Weaver wrote: >> On Thu, 17 Nov 2016, Josh Poimboeuf wrote: >> >> > On Thu, Nov 17, 2016 at 10:48:27AM +0100, Dmitry Vyukov wrote: >> > > Just in case, there is currently a known KASAN false positive related >> > > to longjmp's on GPFs. When a syscall hits GPF stack is unwound to >> > > kernel entry point, this leaves a bunch of stray poisoned redzones on >> > > the thread stack. They later cause false stack-out-of-bounds reports. >> > > >> > > But this does not seem to be the case here. Kernel is not tainted. And >> > > shadow at the bottom of the reports looks sane. >> > > >> > > But if that's the case somehow, we will need to add >> > > kasan_unpoison_remaining_stack() call before a longjmp like we did for >> > > jprobe_return(): >> > > https://groups.google.com/d/msg/kasan-dev/Hzox58yZ4MU/TOdFoWMuBQAJ >> > >> > I'm pretty sure this isn't a KASAN false positive. The unwinder does >> > actually seem to be accessing a bad area of the stack, in the middle of >> > a function's stack frame. >> >> I'm having trouble reproducing it on a few other machines I have fuzzing. >> So there might be some kernel option contributing, I need to compare >> .configs. >> >> Also the machine that easily triggers the problem I'm compiling with >> gcc-5.4 where the machines I can't are using gcc-4.9. > > I believe KASAN only works with gcc 5 and later, so that would explain > why you aren't seeing it with gcc 4.9. Right. 4.9 has limited support for KASAN. It supports general instrumentation, but only with CONFIG_KASAN_OUTLINE, and it does not support stack poisoning. Which is required to detect stack OOBs. ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 14:58 ` Dmitry Vyukov @ 2016-11-17 17:15 ` Vince Weaver 0 siblings, 0 replies; 33+ messages in thread From: Vince Weaver @ 2016-11-17 17:15 UTC (permalink / raw) To: Dmitry Vyukov Cc: Josh Poimboeuf, Vince Weaver, Peter Zijlstra, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, Stephane Eranian On Thu, 17 Nov 2016, Dmitry Vyukov wrote: > On Thu, Nov 17, 2016 at 3:36 PM, Josh Poimboeuf <jpoimboe@redhat.com> wrote: > > On Thu, Nov 17, 2016 at 09:25:58AM -0500, Vince Weaver wrote: > >> On Thu, 17 Nov 2016, Josh Poimboeuf wrote: > >> > >> > On Thu, Nov 17, 2016 at 10:48:27AM +0100, Dmitry Vyukov wrote: > >> > > Just in case, there is currently a known KASAN false positive related > >> > > to longjmp's on GPFs. When a syscall hits GPF stack is unwound to > >> > > kernel entry point, this leaves a bunch of stray poisoned redzones on > >> > > the thread stack. They later cause false stack-out-of-bounds reports. > >> > > > >> > > But this does not seem to be the case here. Kernel is not tainted. And > >> > > shadow at the bottom of the reports looks sane. > >> > > > >> > > But if that's the case somehow, we will need to add > >> > > kasan_unpoison_remaining_stack() call before a longjmp like we did for > >> > > jprobe_return(): > >> > > https://groups.google.com/d/msg/kasan-dev/Hzox58yZ4MU/TOdFoWMuBQAJ > >> > > >> > I'm pretty sure this isn't a KASAN false positive. The unwinder does > >> > actually seem to be accessing a bad area of the stack, in the middle of > >> > a function's stack frame. > >> > >> I'm having trouble reproducing it on a few other machines I have fuzzing. > >> So there might be some kernel option contributing, I need to compare > >> .configs. > >> > >> Also the machine that easily triggers the problem I'm compiling with > >> gcc-5.4 where the machines I can't are using gcc-4.9. > > > > I believe KASAN only works with gcc 5 and later, so that would explain > > why you aren't seeing it with gcc 4.9. > > Right. 4.9 has limited support for KASAN. It supports general > instrumentation, but only with CONFIG_KASAN_OUTLINE, and it does not > support stack poisoning. Which is required to detect stack OOBs. I guess it's time to update the other machines to debian-unstable then. I didn't really need to be able to run dmesg as non-root anyway. I would actually be compiling the kernels with gcc-6.2 rather than gcc-5 but that seems to not work currently. Haven't had time to see if that's a known issue or not. Vince ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 9:04 ` Peter Zijlstra 2016-11-17 9:13 ` Peter Zijlstra @ 2016-11-17 15:18 ` Josh Poimboeuf 2016-11-17 16:07 ` Peter Zijlstra 1 sibling, 1 reply; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-17 15:18 UTC (permalink / raw) To: Peter Zijlstra Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Thu, Nov 17, 2016 at 10:04:46AM +0100, Peter Zijlstra wrote: > On Wed, Nov 16, 2016 at 10:48:28PM -0600, Josh Poimboeuf wrote: > > Peter or Vince, can you try to recreate with this patch? It dumps the > > raw stack contents during a stack dump. Hopefully that would give a > > clue about what's going wrong. > > > Here goes... I'll do another run and get you the results of that as > well. Thanks, I just waded through this and it turned up some good clues. And according to 'git blame', you might be able to help :-) It's not stack corruption. Instead it looks like __intel_pmu_pebs_event() is creating a bad or stale pt_regs which gets passed to the unwinder. Specifically, regs->bp points to a seemingly random address on the NMI stack. Which seems odd, considering the code itself is running on the same NMI stack. I don't know much about the PEBS code but it seems like it's passing some stale data. Either that or there's some NMI nesting going on. -- Josh ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 15:18 ` Josh Poimboeuf @ 2016-11-17 16:07 ` Peter Zijlstra 2016-11-17 17:17 ` Peter Zijlstra 0 siblings, 1 reply; 33+ messages in thread From: Peter Zijlstra @ 2016-11-17 16:07 UTC (permalink / raw) To: Josh Poimboeuf Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Thu, Nov 17, 2016 at 09:18:48AM -0600, Josh Poimboeuf wrote: > On Thu, Nov 17, 2016 at 10:04:46AM +0100, Peter Zijlstra wrote: > > On Wed, Nov 16, 2016 at 10:48:28PM -0600, Josh Poimboeuf wrote: > > > Peter or Vince, can you try to recreate with this patch? It dumps the > > > raw stack contents during a stack dump. Hopefully that would give a > > > clue about what's going wrong. > > > > > > Here goes... I'll do another run and get you the results of that as > > well. > > Thanks, I just waded through this and it turned up some good clues. And > according to 'git blame', you might be able to help :-) > > It's not stack corruption. Instead it looks like > __intel_pmu_pebs_event() is creating a bad or stale pt_regs which gets > passed to the unwinder. Specifically, regs->bp points to a seemingly > random address on the NMI stack. Which seems odd, considering the code > itself is running on the same NMI stack. > > I don't know much about the PEBS code but it seems like it's passing > some stale data. Either that or there's some NMI nesting going on. Ooh, indeed. The PEBS record can be quite stale by the time we get to the interrupt. Using those registers for an unwind is 'interesting' at best. Esp. with the multi-pebs stuff that's landed this can be very very stale, but even single pebs can have a radically different stack at interrupt time than we had at record time -- imagine a (i)ret happening in between. Let me consider that code, and what to do about this; its been a while since I went over all that. ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-17 16:07 ` Peter Zijlstra @ 2016-11-17 17:17 ` Peter Zijlstra 2016-11-22 12:30 ` [tip:perf/urgent] perf/x86/intel: Cure bogus unwind from PEBS entries tip-bot for Peter Zijlstra 0 siblings, 1 reply; 33+ messages in thread From: Peter Zijlstra @ 2016-11-17 17:17 UTC (permalink / raw) To: Josh Poimboeuf Cc: Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Thu, Nov 17, 2016 at 05:07:00PM +0100, Peter Zijlstra wrote: > On Thu, Nov 17, 2016 at 09:18:48AM -0600, Josh Poimboeuf wrote: > > Thanks, I just waded through this and it turned up some good clues. And > > according to 'git blame', you might be able to help :-) > > > > It's not stack corruption. Instead it looks like > > __intel_pmu_pebs_event() is creating a bad or stale pt_regs which gets > > passed to the unwinder. Specifically, regs->bp points to a seemingly > > random address on the NMI stack. Which seems odd, considering the code > > itself is running on the same NMI stack. > > > > I don't know much about the PEBS code but it seems like it's passing > > some stale data. Either that or there's some NMI nesting going on. So the puzzle was BP,SP pointing into the NMI stack at random spots. But I think I can explain this; if the event has a very _very_ short period, then the tail __intel_pmu_enable_all() call from the PMI handler will 'insta' trigger a record and raise another PMI. We then get back-to-back NMIs with a record pointing to a now overwritten stack. The other scenario, where there is an (i)ret between the record and the interrupt would be less confusing but still wrong. Solve this by always using iregs->{bp,sp} for callchains. The below patch still copies the record BP,SP when !CALLCHAINS && SAMPLE_REGS; does this make sense? The fuzzer is still running with this patch applied.. I'll let it run for a while. --- arch/x86/events/intel/ds.c | 35 +++++++++++++++++++++++------------ arch/x86/events/perf_event.h | 2 +- 2 files changed, 24 insertions(+), 13 deletions(-) diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c index 0319311dbdbb..be202390bbd3 100644 --- a/arch/x86/events/intel/ds.c +++ b/arch/x86/events/intel/ds.c @@ -1108,20 +1108,20 @@ static void setup_pebs_sample_data(struct perf_event *event, } /* - * We use the interrupt regs as a base because the PEBS record - * does not contain a full regs set, specifically it seems to - * lack segment descriptors, which get used by things like - * user_mode(). + * We use the interrupt regs as a base because the PEBS record does not + * contain a full regs set, specifically it seems to lack segment + * descriptors, which get used by things like user_mode(). * - * In the simple case fix up only the IP and BP,SP regs, for - * PERF_SAMPLE_IP and PERF_SAMPLE_CALLCHAIN to function properly. - * A possible PERF_SAMPLE_REGS will have to transfer all regs. + * In the simple case fix up only the IP for PERF_SAMPLE_IP. + * + * We must however always use BP,SP from iregs for the unwinder to stay + * sane; the record BP,SP can point into thin air when the record is + * from a previous PMI context or an (I)RET happend between the record + * and PMI. */ *regs = *iregs; regs->flags = pebs->flags; set_linear_ip(regs, pebs->ip); - regs->bp = pebs->bp; - regs->sp = pebs->sp; if (sample_type & PERF_SAMPLE_REGS_INTR) { regs->ax = pebs->ax; @@ -1130,10 +1130,21 @@ static void setup_pebs_sample_data(struct perf_event *event, regs->dx = pebs->dx; regs->si = pebs->si; regs->di = pebs->di; - regs->bp = pebs->bp; - regs->sp = pebs->sp; - regs->flags = pebs->flags; + /* + * Per the above; only set BP,SP if we don't need callchains. + * + * XXX: does this make sense? + */ + if (!(sample_type & PERF_SAMPLE_CALLCHAIN)) { + regs->bp = pebs->bp; + regs->sp = pebs->sp; + } + + /* + * Preserve PERF_EFLAGS_VM from set_linear_ip(). + */ + regs->flags = pebs->flags | (regs->flags & PERF_EFLAGS_VM); #ifndef CONFIG_X86_32 regs->r8 = pebs->r8; regs->r9 = pebs->r9; diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 5874d8de1f8d..a77ee026643d 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -113,7 +113,7 @@ struct debug_store { * Per register state. */ struct er_account { - raw_spinlock_t lock; /* per-core: protect structure */ + raw_spinlock_t lock; /* per-core: protect structure */ u64 config; /* extra MSR config */ u64 reg; /* extra MSR number */ atomic_t ref; /* reference count */ ^ permalink raw reply related [flat|nested] 33+ messages in thread
* [tip:perf/urgent] perf/x86/intel: Cure bogus unwind from PEBS entries 2016-11-17 17:17 ` Peter Zijlstra @ 2016-11-22 12:30 ` tip-bot for Peter Zijlstra 0 siblings, 0 replies; 33+ messages in thread From: tip-bot for Peter Zijlstra @ 2016-11-22 12:30 UTC (permalink / raw) To: linux-tip-commits Cc: dvyukov, jpoimboe, torvalds, mingo, eranian, alexander.shishkin, acme, jolsa, linux-kernel, acme, tglx, davej, vincent.weaver, eranian, peterz, hpa Commit-ID: b8000586c90b4804902058a38d3a59ce5708e695 Gitweb: http://git.kernel.org/tip/b8000586c90b4804902058a38d3a59ce5708e695 Author: Peter Zijlstra <peterz@infradead.org> AuthorDate: Thu, 17 Nov 2016 18:17:31 +0100 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Tue, 22 Nov 2016 12:36:58 +0100 perf/x86/intel: Cure bogus unwind from PEBS entries Vince Weaver reported that perf_fuzzer + KASAN detects that PEBS event unwinds sometimes do 'weird' things. In particular, we seemed to be ending up unwinding from random places on the NMI stack. While it was somewhat expected that the event record BP,SP would not match the interrupt BP,SP in that the interrupt is strictly later than the record event, it was overlooked that it could be on an already overwritten stack. Therefore, don't copy the recorded BP,SP over the interrupted BP,SP when we need stack unwinds. Note that its still possible the unwind doesn't full match the actual event, as its entirely possible to have done an (I)RET between record and interrupt, but on average it should still point in the general direction of where the event came from. Also, it's the best we can do, considering. The particular scenario that triggered the bogus NMI stack unwind was a PEBS event with very short period, upon enabling the event at the tail of the PMI handler (FREEZE_ON_PMI is not used), it instantly triggers a record (while still on the NMI stack) which in turn triggers the next PMI. This then causes back-to-back NMIs and we'll try and unwind the stack-frame from the last NMI, which obviously is now overwritten by our own. Analyzed-by: Josh Poimboeuf <jpoimboe@redhat.com> Reported-by: Vince Weaver <vincent.weaver@maine.edu> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@gmail.com> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: davej@codemonkey.org.uk <davej@codemonkey.org.uk> Cc: dvyukov@google.com <dvyukov@google.com> Cc: stable@vger.kernel.org Fixes: ca037701a025 ("perf, x86: Add PEBS infrastructure") Link: http://lkml.kernel.org/r/20161117171731.GV3157@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/events/intel/ds.c | 35 +++++++++++++++++++++++------------ arch/x86/events/perf_event.h | 2 +- 2 files changed, 24 insertions(+), 13 deletions(-) diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c index 0319311..be20239 100644 --- a/arch/x86/events/intel/ds.c +++ b/arch/x86/events/intel/ds.c @@ -1108,20 +1108,20 @@ static void setup_pebs_sample_data(struct perf_event *event, } /* - * We use the interrupt regs as a base because the PEBS record - * does not contain a full regs set, specifically it seems to - * lack segment descriptors, which get used by things like - * user_mode(). + * We use the interrupt regs as a base because the PEBS record does not + * contain a full regs set, specifically it seems to lack segment + * descriptors, which get used by things like user_mode(). * - * In the simple case fix up only the IP and BP,SP regs, for - * PERF_SAMPLE_IP and PERF_SAMPLE_CALLCHAIN to function properly. - * A possible PERF_SAMPLE_REGS will have to transfer all regs. + * In the simple case fix up only the IP for PERF_SAMPLE_IP. + * + * We must however always use BP,SP from iregs for the unwinder to stay + * sane; the record BP,SP can point into thin air when the record is + * from a previous PMI context or an (I)RET happend between the record + * and PMI. */ *regs = *iregs; regs->flags = pebs->flags; set_linear_ip(regs, pebs->ip); - regs->bp = pebs->bp; - regs->sp = pebs->sp; if (sample_type & PERF_SAMPLE_REGS_INTR) { regs->ax = pebs->ax; @@ -1130,10 +1130,21 @@ static void setup_pebs_sample_data(struct perf_event *event, regs->dx = pebs->dx; regs->si = pebs->si; regs->di = pebs->di; - regs->bp = pebs->bp; - regs->sp = pebs->sp; - regs->flags = pebs->flags; + /* + * Per the above; only set BP,SP if we don't need callchains. + * + * XXX: does this make sense? + */ + if (!(sample_type & PERF_SAMPLE_CALLCHAIN)) { + regs->bp = pebs->bp; + regs->sp = pebs->sp; + } + + /* + * Preserve PERF_EFLAGS_VM from set_linear_ip(). + */ + regs->flags = pebs->flags | (regs->flags & PERF_EFLAGS_VM); #ifndef CONFIG_X86_32 regs->r8 = pebs->r8; regs->r9 = pebs->r9; diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 5874d8d..a77ee02 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -113,7 +113,7 @@ struct debug_store { * Per register state. */ struct er_account { - raw_spinlock_t lock; /* per-core: protect structure */ + raw_spinlock_t lock; /* per-core: protect structure */ u64 config; /* extra MSR config */ u64 reg; /* extra MSR number */ atomic_t ref; /* reference count */ ^ permalink raw reply related [flat|nested] 33+ messages in thread
* Re: perf: fuzzer KASAN unwind_get_return_address 2016-11-16 14:49 ` Peter Zijlstra 2016-11-16 14:58 ` Josh Poimboeuf 2016-11-16 14:58 ` Peter Zijlstra @ 2016-11-16 15:06 ` Vince Weaver 2 siblings, 0 replies; 33+ messages in thread From: Vince Weaver @ 2016-11-16 15:06 UTC (permalink / raw) To: Peter Zijlstra Cc: Josh Poimboeuf, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Wed, 16 Nov 2016, Peter Zijlstra wrote: > On Wed, Nov 16, 2016 at 08:37:46AM -0600, Josh Poimboeuf wrote: > > On Wed, Nov 16, 2016 at 02:03:37PM +0100, Peter Zijlstra wrote: > > > On Tue, Nov 15, 2016 at 02:57:48PM -0600, Josh Poimboeuf wrote: > > > > Would you mind posting a disassembly of unwind_get_return_address()? > > > > Any idea how recreatable it is? (In particular I'd be interested in > > > > seeing this dump with the latest unwinder improvements in the -tip tree, > > > > which dump the pt_regs associated with an interrupt.) > > > > > > Fairly reproducable it seems, doesn't seem to include pt_regs dumps > > > though :/ > > > > > > tip/master as of this morning. > > > > Thanks. This is actually a different issue than the one reported by > > Vince. In this case FRAME_POINTER is disabled, so it uses the "guess" > > unwinder which scans every address on the stack, looking for text > > addresses. So the kasan errors are expected. > > > > (The missing pt_regs are also expected: the guess unwinder doesn't show > > them.) > > > > I'll work up a patch to fix this. I still have no idea what's causing > > Vince's bug in the frame pointer unwinder. > > Hurm,.. by the number of '?' entries in Vince's backtrace I was assuming > it was without frame pointers. > > Let me enable those and run again, it didn't insta-trigger like it does > without. Yes, that machine does have frame pointers enabled. Sorry for the delay responding, the machine crashed right after I had left last night and so I wasn't able to take a look at what was going on until right now. It triggers fairly quickly on the Haswell machine but not my other machines (although they possibly don't have quite as many debug options turned on). Vince ^ permalink raw reply [flat|nested] 33+ messages in thread
* [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder 2016-11-16 13:03 ` Peter Zijlstra 2016-11-16 13:18 ` Dmitry Vyukov 2016-11-16 14:37 ` Josh Poimboeuf @ 2016-11-17 15:57 ` Josh Poimboeuf 2016-11-17 15:57 ` [PATCH 2/2] dumpstack: prevent KASAN false positive warnings Josh Poimboeuf ` (2 more replies) 2 siblings, 3 replies; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-17 15:57 UTC (permalink / raw) To: x86 Cc: Peter Zijlstra, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian The guess unwinder scans the entire stack, which can cause KASAN "stack-out-of-bounds" false positive warnings. Tell KASAN to ignore it. Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> --- arch/x86/kernel/unwind_guess.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/unwind_guess.c b/arch/x86/kernel/unwind_guess.c index 2d721e5..b80e8bf 100644 --- a/arch/x86/kernel/unwind_guess.c +++ b/arch/x86/kernel/unwind_guess.c @@ -7,11 +7,13 @@ unsigned long unwind_get_return_address(struct unwind_state *state) { + unsigned long addr = READ_ONCE_NOCHECK(*state->sp); + if (unwind_done(state)) return 0; return ftrace_graph_ret_addr(state->task, &state->graph_idx, - *state->sp, state->sp); + addr, state->sp); } EXPORT_SYMBOL_GPL(unwind_get_return_address); @@ -23,8 +25,10 @@ bool unwind_next_frame(struct unwind_state *state) return false; do { + unsigned long addr = READ_ONCE_NOCHECK(*state->sp); + for (state->sp++; state->sp < info->end; state->sp++) - if (__kernel_text_address(*state->sp)) + if (__kernel_text_address(addr)) return true; state->sp = info->next_sp; -- 2.7.4 ^ permalink raw reply related [flat|nested] 33+ messages in thread
* [PATCH 2/2] dumpstack: prevent KASAN false positive warnings 2016-11-17 15:57 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf @ 2016-11-17 15:57 ` Josh Poimboeuf 2016-11-18 9:04 ` [tip:x86/urgent] x86/dumpstack: Prevent " tip-bot for Josh Poimboeuf 2016-11-17 20:26 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf 2016-11-18 9:04 ` [tip:x86/urgent] x86/unwind: Prevent " tip-bot for Josh Poimboeuf 2 siblings, 1 reply; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-17 15:57 UTC (permalink / raw) To: x86 Cc: Peter Zijlstra, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian The oops stack dump code scans the entire stack, which can cause KASAN "stack-out-of-bounds" false positive warnings. Tell KASAN to ignore it. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> --- arch/x86/kernel/dumpstack.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 9b7cf5c..85f854b 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -112,7 +112,7 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, for (; stack < stack_info.end; stack++) { unsigned long real_addr; int reliable = 0; - unsigned long addr = *stack; + unsigned long addr = READ_ONCE_NOCHECK(*stack); unsigned long *ret_addr_p = unwind_get_return_address_ptr(&state); -- 2.7.4 ^ permalink raw reply related [flat|nested] 33+ messages in thread
* [tip:x86/urgent] x86/dumpstack: Prevent KASAN false positive warnings 2016-11-17 15:57 ` [PATCH 2/2] dumpstack: prevent KASAN false positive warnings Josh Poimboeuf @ 2016-11-18 9:04 ` tip-bot for Josh Poimboeuf 0 siblings, 0 replies; 33+ messages in thread From: tip-bot for Josh Poimboeuf @ 2016-11-18 9:04 UTC (permalink / raw) To: linux-tip-commits Cc: eranian, bp, acme, peterz, dvlasenk, luto, brgerst, tglx, linux-kernel, torvalds, hpa, vincent.weaver, jpoimboe, mingo Commit-ID: 91e08ab0c8515450258d7ad9033bfe69bebad25a Gitweb: http://git.kernel.org/tip/91e08ab0c8515450258d7ad9033bfe69bebad25a Author: Josh Poimboeuf <jpoimboe@redhat.com> AuthorDate: Thu, 17 Nov 2016 09:57:24 -0600 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Fri, 18 Nov 2016 09:38:00 +0100 x86/dumpstack: Prevent KASAN false positive warnings The oops stack dump code scans the entire stack, which can cause KASAN "stack-out-of-bounds" false positive warnings. Tell KASAN to ignore it. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: davej@codemonkey.org.uk Cc: dvyukov@google.com Link: http://lkml.kernel.org/r/5f6e80c4b0c7f7f0b6211900847a247cdaad753c.1479398226.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/kernel/dumpstack.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 9b7cf5c..85f854b 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -112,7 +112,7 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, for (; stack < stack_info.end; stack++) { unsigned long real_addr; int reliable = 0; - unsigned long addr = *stack; + unsigned long addr = READ_ONCE_NOCHECK(*stack); unsigned long *ret_addr_p = unwind_get_return_address_ptr(&state); ^ permalink raw reply related [flat|nested] 33+ messages in thread
* Re: [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder 2016-11-17 15:57 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf 2016-11-17 15:57 ` [PATCH 2/2] dumpstack: prevent KASAN false positive warnings Josh Poimboeuf @ 2016-11-17 20:26 ` Josh Poimboeuf 2016-11-18 8:38 ` Ingo Molnar 2016-11-18 9:04 ` [tip:x86/urgent] x86/unwind: Prevent " tip-bot for Josh Poimboeuf 2 siblings, 1 reply; 33+ messages in thread From: Josh Poimboeuf @ 2016-11-17 20:26 UTC (permalink / raw) To: x86 Cc: Peter Zijlstra, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian On Thu, Nov 17, 2016 at 09:57:23AM -0600, Josh Poimboeuf wrote: > The guess unwinder scans the entire stack, which can cause KASAN > "stack-out-of-bounds" false positive warnings. Tell KASAN to ignore it. > > Reported-by: Peter Zijlstra <peterz@infradead.org> > Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Whoops, forgot to prefix the patch subjects with "x86/". -- Josh ^ permalink raw reply [flat|nested] 33+ messages in thread
* Re: [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder 2016-11-17 20:26 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf @ 2016-11-18 8:38 ` Ingo Molnar 0 siblings, 0 replies; 33+ messages in thread From: Ingo Molnar @ 2016-11-18 8:38 UTC (permalink / raw) To: Josh Poimboeuf Cc: x86, Peter Zijlstra, Vince Weaver, linux-kernel, Ingo Molnar, Arnaldo Carvalho de Melo, davej, dvyukov, Stephane Eranian * Josh Poimboeuf <jpoimboe@redhat.com> wrote: > On Thu, Nov 17, 2016 at 09:57:23AM -0600, Josh Poimboeuf wrote: > > The guess unwinder scans the entire stack, which can cause KASAN > > "stack-out-of-bounds" false positive warnings. Tell KASAN to ignore it. > > > > Reported-by: Peter Zijlstra <peterz@infradead.org> > > Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> > > Whoops, forgot to prefix the patch subjects with "x86/". No problem, fixed it up. Thanks, Ingo ^ permalink raw reply [flat|nested] 33+ messages in thread
* [tip:x86/urgent] x86/unwind: Prevent KASAN false positive warnings in guess unwinder 2016-11-17 15:57 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf 2016-11-17 15:57 ` [PATCH 2/2] dumpstack: prevent KASAN false positive warnings Josh Poimboeuf 2016-11-17 20:26 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf @ 2016-11-18 9:04 ` tip-bot for Josh Poimboeuf 2 siblings, 0 replies; 33+ messages in thread From: tip-bot for Josh Poimboeuf @ 2016-11-18 9:04 UTC (permalink / raw) To: linux-tip-commits Cc: hpa, eranian, acme, jpoimboe, linux-kernel, vincent.weaver, mingo, brgerst, tglx, bp, luto, dvlasenk, torvalds, peterz Commit-ID: c2d75e03d6307bda0e14b616818a6f7b09fd623a Gitweb: http://git.kernel.org/tip/c2d75e03d6307bda0e14b616818a6f7b09fd623a Author: Josh Poimboeuf <jpoimboe@redhat.com> AuthorDate: Thu, 17 Nov 2016 09:57:23 -0600 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Fri, 18 Nov 2016 09:38:00 +0100 x86/unwind: Prevent KASAN false positive warnings in guess unwinder The guess unwinder scans the entire stack, which can cause KASAN "stack-out-of-bounds" false positive warnings. Tell KASAN to ignore it. Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Stephane Eranian <eranian@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: davej@codemonkey.org.uk Cc: dvyukov@google.com Link: http://lkml.kernel.org/r/61939c0b2b2d63ce97ba59cba3b00fd47c2962cf.1479398226.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/kernel/unwind_guess.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/unwind_guess.c b/arch/x86/kernel/unwind_guess.c index 2d721e5..b80e8bf 100644 --- a/arch/x86/kernel/unwind_guess.c +++ b/arch/x86/kernel/unwind_guess.c @@ -7,11 +7,13 @@ unsigned long unwind_get_return_address(struct unwind_state *state) { + unsigned long addr = READ_ONCE_NOCHECK(*state->sp); + if (unwind_done(state)) return 0; return ftrace_graph_ret_addr(state->task, &state->graph_idx, - *state->sp, state->sp); + addr, state->sp); } EXPORT_SYMBOL_GPL(unwind_get_return_address); @@ -23,8 +25,10 @@ bool unwind_next_frame(struct unwind_state *state) return false; do { + unsigned long addr = READ_ONCE_NOCHECK(*state->sp); + for (state->sp++; state->sp < info->end; state->sp++) - if (__kernel_text_address(*state->sp)) + if (__kernel_text_address(addr)) return true; state->sp = info->next_sp; ^ permalink raw reply related [flat|nested] 33+ messages in thread
end of thread, other threads:[~2016-11-22 12:31 UTC | newest] Thread overview: 33+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2016-11-15 17:43 perf: fuzzer KASAN unwind_get_return_address Vince Weaver 2016-11-15 18:57 ` Peter Zijlstra 2016-11-15 19:04 ` Dmitry Vyukov 2016-11-15 20:56 ` Josh Poimboeuf 2016-11-15 19:05 ` Vince Weaver 2016-11-15 20:57 ` Josh Poimboeuf 2016-11-16 13:03 ` Peter Zijlstra 2016-11-16 13:18 ` Dmitry Vyukov 2016-11-16 14:37 ` Josh Poimboeuf 2016-11-16 14:49 ` Peter Zijlstra 2016-11-16 14:58 ` Josh Poimboeuf 2016-11-16 14:58 ` Peter Zijlstra 2016-11-17 4:48 ` Josh Poimboeuf 2016-11-17 9:04 ` Peter Zijlstra 2016-11-17 9:13 ` Peter Zijlstra 2016-11-17 9:30 ` Peter Zijlstra 2016-11-17 9:48 ` Dmitry Vyukov 2016-11-17 14:01 ` Josh Poimboeuf 2016-11-17 14:25 ` Vince Weaver 2016-11-17 14:36 ` Josh Poimboeuf 2016-11-17 14:58 ` Dmitry Vyukov 2016-11-17 17:15 ` Vince Weaver 2016-11-17 15:18 ` Josh Poimboeuf 2016-11-17 16:07 ` Peter Zijlstra 2016-11-17 17:17 ` Peter Zijlstra 2016-11-22 12:30 ` [tip:perf/urgent] perf/x86/intel: Cure bogus unwind from PEBS entries tip-bot for Peter Zijlstra 2016-11-16 15:06 ` perf: fuzzer KASAN unwind_get_return_address Vince Weaver 2016-11-17 15:57 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf 2016-11-17 15:57 ` [PATCH 2/2] dumpstack: prevent KASAN false positive warnings Josh Poimboeuf 2016-11-18 9:04 ` [tip:x86/urgent] x86/dumpstack: Prevent " tip-bot for Josh Poimboeuf 2016-11-17 20:26 ` [PATCH 1/2] unwind: prevent KASAN false positive warnings in guess unwinder Josh Poimboeuf 2016-11-18 8:38 ` Ingo Molnar 2016-11-18 9:04 ` [tip:x86/urgent] x86/unwind: Prevent " tip-bot for Josh Poimboeuf
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