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X-Received: by 2002:a24:244:: with SMTP id 65mr6552331itu.3.1549552025058; Thu, 07 Feb 2019 07:07:05 -0800 (PST) Date: Thu, 07 Feb 2019 07:07:05 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000003cadb05814f3284@google.com> Subject: INFO: rcu detected stall in __perf_sw_event From: syzbot To: acme@kernel.org, alexander.shishkin@linux.intel.com, jolsa@redhat.com, linux-kernel@vger.kernel.org, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: b0314565da2b Merge tag 'for_linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15cd5e73400000 kernel config: https://syzkaller.appspot.com/x/.config?x=8f00801d7b7c4fe6 dashboard link: https://syzkaller.appspot.com/bug?extid=a41ac89a0712acde0e84 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1707cd2f400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a41ac89a0712acde0e84@syzkaller.appspotmail.com 8021q: adding VLAN 0 to HW filter on device batadv0 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10499 ticks this GP) idle=d02/1/0x4000000000000002 softirq=13779/13779 fqs=5238 rcu: (t=10500 jiffies g=11657 q=1546) NMI backtrace for cpu 0 CPU: 0 PID: 9826 Comm: syz-executor0 Not tainted 5.0.0-rc5+ #61 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1211 print_cpu_stall kernel/rcu/tree.c:1348 [inline] check_cpu_stall kernel/rcu/tree.c:1422 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks.cold+0x500/0xa4a kernel/rcu/tree.c:2521 update_process_times+0x32/0x80 kernel/time/timer.c:1635 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:memcpy_erms+0x8/0x10 arch/x86/lib/memcpy_64.S:56 Code: 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 f3 a4 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe 7c 35 RSP: 0018:ffff88808fd171b8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff888092eb1798 RBX: 0000000000000868 RCX: 0000000000000000 RDX: 0000000000000010 RSI: ffff88808fd17348 RDI: ffff888092eb17a8 RBP: ffff88808fd171d8 R08: 1ffff110125d62f3 R09: ffffed10125d62f5 R10: ffffed10125d62f4 R11: ffff888092eb17a7 R12: 0000000000000010 R13: ffff888092eb1798 R14: ffff88808fd17338 R15: ffff88808fd17550 memcpy include/linux/string.h:352 [inline] memcpy_common kernel/events/internal.h:172 [inline] __output_copy kernel/events/internal.h:176 [inline] perf_output_read_group kernel/events/core.c:6114 [inline] perf_output_read+0xe16/0x1390 kernel/events/core.c:6147 perf_output_sample+0x13b9/0x1a90 kernel/events/core.c:6189 __perf_event_output kernel/events/core.c:6511 [inline] perf_event_output_forward+0x150/0x290 kernel/events/core.c:6524 __perf_event_overflow+0x144/0x360 kernel/events/core.c:7768 perf_swevent_overflow+0xaa/0x140 kernel/events/core.c:7844 perf_swevent_event+0x1f7/0x2f0 kernel/events/core.c:7877 do_perf_sw_event kernel/events/core.c:7985 [inline] ___perf_sw_event+0x31c/0x570 kernel/events/core.c:8016 __perf_sw_event+0x51/0xa0 kernel/events/core.c:8028 perf_sw_event include/linux/perf_event.h:1054 [inline] do_user_addr_fault arch/x86/mm/fault.c:1516 [inline] __do_page_fault+0x734/0xd60 arch/x86/mm/fault.c:1541 do_page_fault+0x71/0x581 arch/x86/mm/fault.c:1572 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 83 RSP: 0018:ffff88808fd17b40 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 0000000000001000 RCX: 0000000000000340 RDX: 0000000000001000 RSI: 000000002081d000 RDI: ffff88808b047cc0 RBP: ffff88808fd17b78 R08: ffffed1011609000 R09: 0000000000000000 R10: ffffed1011608fff R11: ffff88808b047fff R12: 000000002081c340 R13: ffff88808b047000 R14: 000000002081d340 R15: 00007ffffffff000 copy_page_from_iter_iovec lib/iov_iter.c:294 [inline] copy_page_from_iter+0x324/0x750 lib/iov_iter.c:907 pipe_write+0x27d/0xfb0 fs/pipe.c:429 call_write_iter include/linux/fs.h:1863 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x613/0x8e0 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e39 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f21b6591c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39 RDX: 0000000041395527 RSI: 0000000020000340 RDI: 0000000000000006 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f21b65926d4 R13: 00000000004c3c0e R14: 00000000004dc3a8 R15: 00000000ffffffff --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches