INFO: rcu detected stall in sys_exit_group

Status: auto-obsoleted due to no activity on 2023/10/06 21:30
Reported-by: syzbot+ab2f9dc6bf0056af2a50@syzkaller.appspotmail.com
First crash: 1144d, last: 1144d
▶ ▼ Similar bugs (17)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_exit_group (7) net 1 syz, C unreliable inconclusive 90 769d 1765d 0/29 upstream: reported C repro on 2021/10/15 18:41
upstream INFO: rcu detected stall in sys_exit_group (6) mm 1 syz, C 4 2145d 2152d 19/29 fixed on 2021/03/10 01:48
linux-5.15 INFO: rcu detected stall in sys_exit_group (2) 1 3 850d 885d 0/3 auto-obsoleted due to no activity on 2024/07/27 04:53
linux-6.1 INFO: rcu detected stall in sys_exit_group (3) origin:upstream 1 syz, C error 34 29d 936d 0/3 upstream: reported C repro on 2024/01/23 11:05
linux-6.1 INFO: rcu detected stall in sys_exit_group (2) 1 1 1082d 1082d 0/3 auto-obsoleted due to no activity on 2023/12/07 20:57
linux-6.1 INFO: rcu detected stall in sys_exit_group 1 1 1193d 1193d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:06
upstream INFO: rcu detected stall in sys_exit_group (2) mm cgroups 1 56 2447d 2448d 0/29 closed as invalid on 2019/12/04 14:14
linux-6.6 INFO: rcu detected stall in sys_exit_group origin:upstream 1 syz, C error 16 43d 390d 0/2 upstream: reported C repro on 2025/07/21 16:02
upstream INFO: rcu detected stall in sys_exit_group (3) mm 1 8 2412d 2412d 0/29 closed as invalid on 2020/01/08 05:23
upstream INFO: rcu detected stall in sys_exit_group (4) mm 1 13 2412d 2412d 0/29 closed as invalid on 2020/01/09 08:13
upstream INFO: rcu detected stall in sys_exit_group (5) mm 1 1 2333d 2333d 0/29 auto-closed as invalid on 2020/06/25 07:58
linux-5.15 INFO: rcu detected stall in sys_exit_group (3) 1 2 639d 673d 0/3 auto-obsoleted due to no activity on 2025/02/22 19:05
linux-5.15 INFO: rcu detected stall in sys_exit_group (4) origin:upstream 1 syz, C error 9 7d00h 331d 0/3 upstream: reported C repro on 2025/09/19 02:54
upstream INFO: rcu detected stall in sys_exit_group kernel 1 syz, C done 1 2528d 2524d 13/29 fixed on 2019/10/09 10:54
android-5-10 BUG: soft lockup in sys_exit_group 1 1 756d 756d 0/2 auto-obsoleted due to no activity on 2024/10/19 10:22
android-5-10 BUG: soft lockup in sys_exit_group (2) 1 1 198d 198d 0/2 auto-obsoleted due to no activity on 2026/04/29 20:43
android-5-15 BUG: soft lockup in sys_exit_group 1 syz, C error 7 717d 860d 0/2 auto-obsoleted due to no activity on 2024/12/07 01:30

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 ticks this GP) idle=b3d/1/0x4000000000000000 softirq=141482/141482 fqs=0 
	(t=29643 jiffies g=207277 q=207)
rcu: rcu_preempt kthread timer wakeup didn't happen for 29642 jiffies! g207277 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=137716
rcu: rcu_preempt kthread starved for 29643 jiffies! g207277 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:26936 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1884
 rcu_gp_fqs_loop+0x2af/0xf70 kernel/rcu/tree.c:1959
 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2132
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 2338 Comm: syz-executor.4 Not tainted 5.15.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_check_gp_kthread_starvation+0x1d2/0x240 kernel/rcu/tree_stall.h:481
 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3911 [inline]
 rcu_sched_clock_irq+0xf21/0x1770 kernel/rcu/tree.c:2606
 update_process_times+0x196/0x200 kernel/time/timer.c:1788
 tick_sched_handle kernel/time/tick-sched.c:237 [inline]
 tick_sched_timer+0x22d/0x3c0 kernel/time/tick-sched.c:1441
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:stack_not_used include/linux/sched/task_stack.h:105 [inline]
RIP: 0010:check_stack_usage kernel/exit.c:757 [inline]
RIP: 0010:do_exit+0x1a05/0x2480 kernel/exit.c:915
Code: f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 05 e8 ab b8 7c 00 4a 83 3c 3b 00 75 0b e8 0f 4d 33 00 49 83 c7 08 <eb> ce 44 8b 35 02 48 2f 0b 4c 89 ff 4c 89 f6 e8 d7 4e 33 00 4d 39
RSP: 0018:ffffc900046b7d80 EFLAGS: 00000216
RAX: ffffffff814cb391 RBX: ffffc900046b0000 RCX: ffff88803fb53b80
RDX: 0000000000000000 RSI: 0000000043736564 RDI: ffffc900046b6448
RBP: ffffc900046b7ec0 R08: ffffffff81559de1 R09: ffffed10035d2541
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 1ffff11007f6a81b R14: ffff88801b299380 R15: 0000000000006450
 do_group_exit+0x144/0x310 kernel/exit.c:994
 __do_sys_exit_group kernel/exit.c:1005 [inline]
 __se_sys_exit_group kernel/exit.c:1003 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1003
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f581ca30389
Code: Unable to access opcode bytes at RIP 0x7f581ca3035f.
RSP: 002b:00007ffcb6b872c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f581ca30389
RDX: 00007f581c9e212b RSI: ffffffffffffffb8 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007f581c5a4000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffcb6b873b0
 </TASK>
NMI backtrace for cpu 0
CPU: 0 PID: 2338 Comm: syz-executor.4 Not tainted 5.15.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x223/0x390 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3911 [inline]
 rcu_sched_clock_irq+0xf26/0x1770 kernel/rcu/tree.c:2606
 update_process_times+0x196/0x200 kernel/time/timer.c:1788
 tick_sched_handle kernel/time/tick-sched.c:237 [inline]
 tick_sched_timer+0x22d/0x3c0 kernel/time/tick-sched.c:1441
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:stack_not_used include/linux/sched/task_stack.h:105 [inline]
RIP: 0010:check_stack_usage kernel/exit.c:757 [inline]
RIP: 0010:do_exit+0x1a05/0x2480 kernel/exit.c:915
Code: f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 05 e8 ab b8 7c 00 4a 83 3c 3b 00 75 0b e8 0f 4d 33 00 49 83 c7 08 <eb> ce 44 8b 35 02 48 2f 0b 4c 89 ff 4c 89 f6 e8 d7 4e 33 00 4d 39
RSP: 0018:ffffc900046b7d80 EFLAGS: 00000216
RAX: ffffffff814cb391 RBX: ffffc900046b0000 RCX: ffff88803fb53b80
RDX: 0000000000000000 RSI: 0000000043736564 RDI: ffffc900046b6448
RBP: ffffc900046b7ec0 R08: ffffffff81559de1 R09: ffffed10035d2541
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 1ffff11007f6a81b R14: ffff88801b299380 R15: 0000000000006450
 do_group_exit+0x144/0x310 kernel/exit.c:994
 __do_sys_exit_group kernel/exit.c:1005 [inline]
 __se_sys_exit_group kernel/exit.c:1003 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1003
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f581ca30389
Code: Unable to access opcode bytes at RIP 0x7f581ca3035f.
RSP: 002b:00007ffcb6b872c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f581ca30389
RDX: 00007f581c9e212b RSI: ffffffffffffffb8 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007f581c5a4000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffcb6b873b0
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/28 21:30 linux-5.15.y 4af60700a60c ca69c785 .config console log report info ci2-linux-5-15-kasan INFO: rcu detected stall in sys_exit_group
* Struck through repros no longer work on HEAD.