INFO: rcu detected stall in nsim_fib_event

Date	Name	Commit	Repro	Result
2024/10/16	linux-5.15.y (ToT)	3a5928702e71	C	[report] INFO: rcu detected stall in corrupted
2024/09/01	upstream (ToT)	431c1646e1f8	C	[report] BUG: workqueue lockup
2024/10/16	upstream (ToT)	c964ced77262	C	Didn't crash

Date

Name

Commit

Repro

Result

2024/10/16

linux-5.15.y (ToT)

3a5928702e71

[report] INFO: rcu detected stall in corrupted

2024/09/01

upstream (ToT)

431c1646e1f8

[report] BUG: workqueue lockup

2024/10/16

upstream (ToT)

c964ced77262

Didn't crash

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-6.1	INFO: rcu detected stall in nsim_fib_event_work				1	354d	354d	0/3	auto-obsoleted due to no activity on 2024/09/19 04:15
linux-6.1	INFO: rcu detected stall in nsim_fib_event_work (2)				1	236d	236d	0/3	auto-obsoleted due to no activity on 2025/01/14 20:10
linux-6.1	INFO: rcu detected stall in nsim_fib_event_work (3) origin:lts-only	syz		error	2	30d	76d	0/3	upstream: reported syz repro on 2025/03/16 03:46
upstream	INFO: rcu detected stall in nsim_fib_event_work mm	C	error		3	6d07h	29d	0/28	upstream: reported C repro on 2025/05/01 18:02

linux-6.1

INFO: rcu detected stall in nsim_fib_event_work

354d

0/3

auto-obsoleted due to no activity on 2024/09/19 04:15

linux-6.1

INFO: rcu detected stall in nsim_fib_event_work (2)

236d

0/3

auto-obsoleted due to no activity on 2025/01/14 20:10

linux-6.1

INFO: rcu detected stall in nsim_fib_event_work (3) origin:lts-only

syz

error

30d

76d

0/3

upstream: reported syz repro on 2025/03/16 03:46

upstream

INFO: rcu detected stall in nsim_fib_event_work mm

error

6d07h

29d

0/28

upstream: reported C repro on 2025/05/01 18:02


Created	Duration	User	Repo	Result
2025/05/30 03:01	13m	retest repro	linux-5.15.y	report log
2025/05/30 03:01	14m	retest repro	linux-5.15.y	report log
2025/05/27 11:41	13m	retest repro	linux-5.15.y	report log
2025/05/27 11:41	13m	retest repro	linux-5.15.y	report log
2025/03/20 07:12	1h12m	retest repro	linux-5.15.y	report log
2025/03/20 07:12	13m	retest repro	linux-5.15.y	report log
2025/03/05 01:32	14m	retest repro	linux-5.15.y	report log
2024/12/27 09:05	16m	retest repro	linux-5.15.y	report log
2024/12/27 09:05	15m	retest repro	linux-5.15.y	report log

Created	Duration	User	Repo	Result
2025/05/06 17:59	1h14m	fix candidate	upstream	error job log
2025/01/19 16:50	5m	fix candidate	upstream	error job log
2024/10/26 09:57	5m	fix candidate	upstream	error job log

Created

Duration

User

Patch

Repo

Result

2025/05/06 17:59

1h14m

fix candidate

upstream

error job log

2025/01/19 16:50

fix candidate

upstream

error job log

2024/10/26 09:57

fix candidate

upstream

error job log

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4158/1:b..l P4162/1:b..l (detected by 0, t=10502 jiffies, g=7257, q=233) task:kworker/1:14 state:R running task stack: 0 pid: 4162 ppid: 2 flags:0x00000008 Workqueue: events nsim_fib_event_work Call trace: __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xe00/0x1c0c kernel/sched/core.c:6376 preempt_schedule_irq+0x90/0x214 kernel/sched/core.c:6780 arm64_preempt_schedule_irq+0x14c/0x21c arch/arm64/kernel/entry-common.c:260 el1_interrupt+0x40/0x58 arch/arm64/kernel/entry-common.c:463 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 lock_is_held_type+0x0/0x198 kernel/locking/lockdep.c:4370 fib_find_node+0x80/0x2a8 net/ipv4/fib_trie.c:942 fib_find_matching_alias net/ipv4/fib_trie.c:1024 [inline] fib_alias_hw_flags_set+0x148/0x8c0 net/ipv4/fib_trie.c:1047 nsim_fib4_rt_hw_flags_set drivers/net/netdevsim/fib.c:351 [inline] nsim_fib4_rt_add drivers/net/netdevsim/fib.c:368 [inline] nsim_fib4_rt_insert drivers/net/netdevsim/fib.c:430 [inline] nsim_fib4_event drivers/net/netdevsim/fib.c:462 [inline] nsim_fib_event drivers/net/netdevsim/fib.c:882 [inline] nsim_fib_event_work+0x12dc/0x2704 drivers/net/netdevsim/fib.c:1483 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310 process_scheduled_works kernel/workqueue.c:2373 [inline] worker_thread+0xb64/0x101c kernel/workqueue.c:2459 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 task:kworker/1:10 state:R running task stack: 0 pid: 4158 ppid: 2 flags:0x00000008 Workqueue: events nsim_fib_event_work Call trace: __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xe00/0x1c0c kernel/sched/core.c:6376 preempt_schedule_irq+0x90/0x214 kernel/sched/core.c:6780 arm64_preempt_schedule_irq+0x14c/0x21c arch/arm64/kernel/entry-common.c:260 el1_interrupt+0x40/0x58 arch/arm64/kernel/entry-common.c:463 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 fib_alias_hw_flags_set+0x474/0x8c0 net/ipv4/fib_trie.c:1095 nsim_fib4_rt_hw_flags_set drivers/net/netdevsim/fib.c:351 [inline] nsim_fib4_rt_add drivers/net/netdevsim/fib.c:368 [inline] nsim_fib4_rt_insert drivers/net/netdevsim/fib.c:430 [inline] nsim_fib4_event drivers/net/netdevsim/fib.c:462 [inline] nsim_fib_event drivers/net/netdevsim/fib.c:882 [inline] nsim_fib_event_work+0x12dc/0x2704 drivers/net/netdevsim/fib.c:1483 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310 process_scheduled_works kernel/workqueue.c:2373 [inline] worker_thread+0xb64/0x101c kernel/workqueue.c:2459 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 rcu: rcu_preempt kthread starved for 10498 jiffies! g7257 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:R running task stack: 0 pid: 15 ppid: 2 flags:0x00000008 Call trace: __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xe00/0x1c0c kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 schedule_timeout+0x180/0x2c8 kernel/time/timer.c:1914 rcu_gp_fqs_loop+0x25c/0x11f0 kernel/rcu/tree.c:1972 rcu_gp_kthread+0xc4/0x2a8 kernel/rcu/tree.c:2145 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 rcu: Stack dump where RCU GP kthread last ran: Task dump for CPU 1: task:syz.2.23 state:R running task stack: 0 pid: 4249 ppid: 4170 flags:0x00000001 Call trace: __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521 0xffff80001f8977e8 0xffff80001f897810

Crashes (4):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	Assets (help?)	Manager	Title
2025/05/11 19:44	linux-5.15.y	3b8db0e4f263	77908e5f	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	INFO: rcu detected stall in nsim_fib_event_work
2025/03/05 01:32	linux-5.15.y	c16c81c81336	c3901742	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	INFO: rcu detected stall in nsim_fib_event_work
2024/09/19 00:13	linux-5.15.y	3a5928702e71	c673ca06	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	INFO: rcu detected stall in nsim_fib_event_work
2024/09/01 09:17	linux-5.15.y	fa93fa65db6e	1eda0d14	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	INFO: rcu detected stall in nsim_fib_event_work

Crashes (4):

Assets (help?)