syzbot

 sign-in | mailing list | source | docs | 🏰
🐞 Open [1324]
≡ Subsystems
🐞 Fixed [7186]
🐞 Invalid [18987]
⬇ Missing Backports [221]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
✨ AI
💬 Send us feedback

INFO: rcu detected stall in sys_nanosleep (3)

Status: closed as invalid on 2020/01/08 05:33
Subsystems: cgroups mm
[Documentation on labels]
First crash: 2360d, last: 2360d
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_nanosleep (2) cgroups mm 1 94 2360d 2360d 0/29 closed as invalid on 2020/01/08 05:23
upstream INFO: rcu detected stall in sys_nanosleep (4) kernel 1 154 2360d 2360d 0/29 closed as invalid on 2020/01/09 08:13
upstream INFO: rcu detected stall in sys_nanosleep (6) kernel 1 2 2115d 2160d 0/29 auto-closed as invalid on 2020/12/07 19:22
upstream INFO: rcu detected stall in sys_nanosleep (8) kernel 1 1 1155d 1155d 0/29 auto-obsoleted due to no activity on 2023/07/26 06:37
upstream INFO: rcu detected stall in sys_nanosleep (7) kernel 1 1 1769d 1769d 0/29 auto-closed as invalid on 2021/11/18 16:55
upstream INFO: rcu detected stall in sys_nanosleep kernel 1 742 2395d 2396d 0/29 closed as invalid on 2019/12/04 14:14
upstream INFO: rcu detected stall in sys_nanosleep (5) kernel 1 2 2282d 2284d 0/29 auto-closed as invalid on 2020/06/23 18:16
linux-6.1 INFO: rcu detected stall in sys_nanosleep 1 1 776d 776d 0/3 auto-obsoleted due to no activity on 2024/08/18 04:21
upstream INFO: rcu detected stall in sys_nanosleep (9) kernel 1 1 802d 802d 0/29 auto-obsoleted due to no activity on 2024/06/13 13:42

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=e4e/1/0x4000000000000002 softirq=14767/14767 fqs=39 
	(t=10500 jiffies g=6925 q=180)
rcu: rcu_preempt kthread starved for 10420 jiffies! g6925 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    28984    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081
 schedule+0x181/0x210 kernel/sched/core.c:4155
 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 8681 Comm: syz-executor.0 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fb/0x318 lib/dump_stack.c:118
 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15a/0x220 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+0xe25/0x1ad0 kernel/rcu/tree.c:2271
 update_process_times+0x12d/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:167 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__memcg_kmem_uncharge+0x138/0x1a0 mm/memcontrol.c:2924
Code: 42 8a 04 28 84 c0 75 3b f6 03 01 75 10 49 83 c7 10 4c 89 ff 48 8b 75 d0 e8 f5 90 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f <5d> c3 44 89 e1 80 e1 07 80 c1 03 38 c1 7c 96 4c 89 e7 e8 11 06 fb
RSP: 0018:ffffc90001f77bc0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffffea00021b0c40 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00021b0c40
RBP: ffffc90001f77bc0 R08: 000000000003a728 R09: ffffed10150d8b21
R10: ffffed10150d8b21 R11: 0000000000000000 R12: ffff8880969e4020
R13: dffffc0000000000 R14: 1ffff11012d3c804 R15: ffff8880a86c58f8
 memcg_kmem_uncharge include/linux/memcontrol.h:1402 [inline]
 free_thread_stack+0x12e/0x590 kernel/fork.c:284
 release_task_stack kernel/fork.c:440 [inline]
 put_task_stack+0xa3/0x130 kernel/fork.c:451
 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081
 schedule+0x181/0x210 kernel/sched/core.c:4155
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x1d0/0x6c0 kernel/time/hrtimer.c:1874
 hrtimer_nanosleep+0x3a6/0x5b0 kernel/time/hrtimer.c:1927
 __do_sys_nanosleep kernel/time/hrtimer.c:1961 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1948 [inline]
 __x64_sys_nanosleep+0x186/0x1d0 kernel/time/hrtimer.c:1948
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4593f0
Code: c0 5b 5d c3 66 0f 1f 44 00 00 8b 04 24 48 83 c4 18 5b 5d c3 66 0f 1f 44 00 00 83 3d 41 f5 61 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 d4 d1 fb ff c3 48 83 ec 08 e8 ea 46 00 00
RSP: 002b:00007ffe38cde4c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 00000000000128b0 RCX: 00000000004593f0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffe38cde4d0
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000f2b940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe38cde520 R14: 00000000000128b0 R15: 00007ffe38cde530

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/01/08 05:31 upstream ae6088216ce4 6738e0b3 .config console log report ci-upstream-kasan-gce-smack-root
2020/01/08 05:27 upstream ae6088216ce4 6738e0b3 .config console log report ci-upstream-kasan-gce-smack-root
2020/01/08 05:26 upstream ae6088216ce4 6738e0b3 .config console log report ci-upstream-kasan-gce-smack-root
2020/01/08 05:25 upstream ae6088216ce4 6738e0b3 .config console log report ci-upstream-kasan-gce-smack-root
* Struck through repros no longer work on HEAD.