syzbot


INFO: rcu detected stall in call_timer_fn

Status: auto-closed as invalid on 2020/01/15 18:43
Reported-by: syzbot+dd1715d10598376b362b@syzkaller.appspotmail.com
First crash: 1712d, last: 1712d
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: soft lockup in call_timer_fn kernel 2 17h59m 15d 0/26 moderation: reported on 2024/05/11 10:25
linux-4.19 INFO: rcu detected stall in call_timer_fn (2) 16 1299d 1573d 0/1 auto-closed as invalid on 2021/03/04 12:30
linux-4.14 INFO: rcu detected stall in call_timer_fn (2) 1 1361d 1361d 0/1 auto-closed as invalid on 2020/12/31 22:00
upstream INFO: rcu detected stall in call_timer_fn (2) kernel C done error 47 858d 1714d 0/26 closed as invalid on 2022/02/08 10:46
upstream INFO: rcu detected stall in call_timer_fn bpf net 2 2052d 2064d 0/26 closed as dup on 2019/01/02 16:26
linux-4.14 INFO: rcu detected stall in call_timer_fn 5 1486d 1605d 0/1 auto-closed as invalid on 2020/08/29 09:07
upstream INFO: rcu detected stall in call_timer_fn (4) mm 1 116d 116d 0/26 auto-obsoleted due to no activity on 2024/03/31 10:44
upstream INFO: rcu detected stall in call_timer_fn (3) kernel 3 597d 613d 0/26 auto-obsoleted due to no activity on 2023/01/12 18:45

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=177413, q=152)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295057507-4295047004), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.0  R  running task    27136  5311  32589 0x00000008
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5297 [inline]
 sched_show_task.cold+0x2ee/0x35d kernel/sched/core.c:5272
 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline]
 check_cpu_stall kernel/rcu/tree.c:1557 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0xaa1/0xd90 kernel/rcu/tree.c:2682
 update_process_times+0x32/0x80 kernel/time/timer.c:1636
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:164
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_release+0x47a/0xa30 kernel/locking/lockdep.c:3922
Code: 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 a7 03 00 00 48 83 3d ed ad 1f 07 00 0f 84 65 02 00 00 48 8b bd 68 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 c7 04 03 00 00 00
RSP: 0000:ffff8880ae807c50 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff10e48c1 RBX: 1ffff11015d00f90 RCX: 1ffff110056a8d5e
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282
RBP: ffff8880ae807d08 R08: ffff88802b546280 R09: 0000000000000000
R10: ffffed1015d04732 R11: ffff8880ae823993 R12: ffff88802b546280
R13: ffffffff815ba9eb R14: 0000000000000003 R15: ffff8880ae807ce0
 call_timer_fn+0x1f8/0x720 kernel/time/timer.c:1329
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers kernel/time/timer.c:1682 [inline]
 __run_timers kernel/time/timer.c:1650 [inline]
 run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1695
 __do_softirq+0x25c/0x921 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0033:0x402511
Code: db 34 b6 d7 82 de 1b 43 48 89 d0 48 f7 64 24 08 48 69 0c 24 e8 03 00 00 48 c1 ea 12 48 8b 74 24 18 64 48 33 34 25 28 00 00 00 <48> 8d 04 11 75 11 48 83 c4 28 c3 bf f0 e2 4b 00 31 c0 e8 78 f4 ff
RSP: 002b:00007f8448a8bc60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: d4f9c1f86597c292 RBX: 000000000075bf28 RCX: 000000000010c110
RDX: 000000000000030a RSI: 0000000000000000 RDI: 0000000000000001
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c
R13: 00000000004c848b R14: 00000000004df060 R15: 000000000075bf2c

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/09/17 18:42 linux-4.19.y db2d0b7c1dde 13dcda9b .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.