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with SMTP id o22mr28335461ilb.229.1577154911202; Mon, 23 Dec 2019 18:35:11 -0800 (PST) Date: Mon, 23 Dec 2019 18:35:11 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003cf909059a69fe9a@google.com> Subject: INFO: rcu detected stall in addrconf_rs_timer (3) From: syzbot To: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.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: a1ec57c0 net: stmmac: tc: Fix TAPRIO division operation git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=126058b9e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7159d94cd4de714e dashboard link: https://syzkaller.appspot.com/bug?extid=c22c6b9dce8e773ddcb6 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=168e33b6e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=178c160ae00000 Bisection is inconclusive: the bug happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16dcb09ee00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=15dcb09ee00000 console output: https://syzkaller.appspot.com/x/log.txt?x=11dcb09ee00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c22c6b9dce8e773ddcb6@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10500 ticks this GP) idle=38a/1/0x4000000000000004 softirq=14860/14860 fqs=0 (t=10500 jiffies g=10057 q=278) rcu: rcu_preempt kthread starved for 10500 jiffies! g10057 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt I29272 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0x9b2/0x18d0 kernel/rcu/tree.c:1821 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 10981 Comm: syz-executor209 Not tainted 5.5.0-rc1-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq.cold+0x509/0xc02 kernel/rcu/tree.c:2271 update_process_times+0x2d/0x70 kernel/time/timer.c:1726 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:fq_flow_add_tail net/sched/sch_fq.c:148 [inline] RIP: 0010:fq_dequeue+0x716/0x16a0 net/sched/sch_fq.c:518 Code: 3c 42 80 3c 30 00 0f 85 94 0c 00 00 48 8b 45 d0 49 8b 5d 48 48 c1 e8 03 42 80 3c 30 00 0f 85 00 0c 00 00 48 8b 45 d0 48 89 18 <48> 8b 45 a0 42 80 3c 30 00 0f 85 4c 0c 00 00 49 83 bf d0 02 00 00 RSP: 0018:ffffc90000da84b8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff88809d78c2d0 RBX: 0000000000000000 RCX: ffffffff864629c3 RDX: 0000000000000100 RSI: ffffffff86462b78 RDI: ffff8880a8b25d58 RBP: ffffc90000da8540 R08: ffff888098622140 R09: fffffbfff165a3c4 R10: fffffbfff165a3c3 R11: ffffffff8b2d1e1f R12: ffff88809d78c2d8 R13: ffff8880a8b25d10 R14: dffffc0000000000 R15: ffff88809d78c000 dequeue_skb net/sched/sch_generic.c:263 [inline] qdisc_restart net/sched/sch_generic.c:366 [inline] __qdisc_run+0x1a5/0x1770 net/sched/sch_generic.c:384 __dev_xmit_skb net/core/dev.c:3677 [inline] __dev_queue_xmit+0x163f/0x35c0 net/core/dev.c:3982 dev_queue_xmit+0x18/0x20 net/core/dev.c:4046 neigh_hh_output include/net/neighbour.h:500 [inline] neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0xfbe/0x25c0 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x444/0xaa0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x25e/0x880 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0xf1f/0x1490 net/ipv6/ndisc.c:505 ndisc_send_rs+0x134/0x720 net/ipv6/ndisc.c:699 addrconf_rs_timer+0x30f/0x6e0 net/ipv6/addrconf.c:3879 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__raw_write_unlock_irq include/linux/rwlock_api_smp.h:268 [inline] RIP: 0010:_raw_write_unlock_irq+0x4f/0x80 kernel/locking/spinlock.c:343 Code: c0 68 35 93 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 22 93 c8 01 00 74 20 fb 66 0f 1f 44 00 00 01 00 00 00 e8 37 19 86 f9 65 8b 05 28 7c 37 78 85 c0 74 06 41 RSP: 0018:ffffc9000cbc7c88 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13266ad RBX: 0000000000000000 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff8880986229d4 RBP: ffffc9000cbc7c90 R08: 1ffffffff165a3bd R09: fffffbfff165a3be R10: fffffbfff165a3bd R11: ffffffff8b2d1def R12: ffffffff8a50d700 R13: 0000000000000002 R14: 0000000000000000 R15: ffff88808d159000 netlink_table_ungrab+0x15/0x30 net/netlink/af_netlink.c:448 netlink_remove net/netlink/af_netlink.c:611 [inline] netlink_release+0x814/0x1c60 net/netlink/af_netlink.c:740 __sock_release+0xce/0x280 net/socket.c:596 sock_close+0x1e/0x30 net/socket.c:1282 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4025c0 Code: 01 f0 ff ff 0f 83 40 0d 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d cd 99 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 14 0d 00 00 c3 48 83 ec 08 e8 7a 02 00 00 RSP: 002b:00007ffe7a88c768 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004025c0 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 RBP: 000000000004b20d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000004037f0 R14: 0000000000000000 R15: 0000000000000000 --- 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#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches