INFO: rcu detected stall in schedule

Date	Name	Commit	Repro	Result
2024/05/23	upstream (ToT)	c760b3725e52	C	[report] INFO: rcu detected stall in schedule_timeout

Date

Name

Commit

Repro

Result

2024/05/23

upstream (ToT)

c760b3725e52

[report] INFO: rcu detected stall in schedule_timeout

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in schedule_timeout (3) cgroups mm	1				11	2158d	2158d	0/29	closed as invalid on 2020/01/09 08:13
upstream	INFO: rcu detected stall in schedule_timeout (7) kernel	1	C	error	error	30	44d	391d	0/29	upstream: reported C repro on 2024/11/09 08:24
linux-6.1	INFO: rcu detected stall in schedule_timeout (2) origin:lts-only	1	C			2	12d	93d	0/3	upstream: reported C repro on 2025/09/02 23:57
upstream	INFO: rcu detected stall in schedule_timeout (2) kernel	1				2	2158d	2158d	0/29	closed as invalid on 2020/01/08 05:23
upstream	INFO: rcu detected stall in schedule_timeout (4) kernel	1				1	863d	863d	0/29	closed as invalid on 2023/09/01 06:44
linux-6.1	INFO: rcu detected stall in schedule_timeout	1				28	531d	596d	0/3	auto-obsoleted due to no activity on 2024/08/31 04:44
upstream	INFO: rcu detected stall in schedule_timeout (5) kernel	1				2	768d	804d	0/29	auto-obsoleted due to no activity on 2024/01/26 16:31
upstream	INFO: rcu detected stall in schedule_timeout cgroups mm	1				69	2193d	2194d	0/29	closed as invalid on 2019/12/04 14:14
upstream	INFO: rcu detected stall in schedule_timeout (6) usb	1	C	done		40	410d	567d	28/29	fixed on 2024/10/22 11:57
linux-6.6	INFO: rcu detected stall in schedule_timeout origin:upstream	1	C			2	2d05h	30d	0/2	upstream: reported C repro on 2025/11/04 19:17

Rank 🛈

upstream

INFO: rcu detected stall in schedule_timeout (3) cgroups mm

2158d

0/29

closed as invalid on 2020/01/09 08:13

upstream

INFO: rcu detected stall in schedule_timeout (7) kernel

error

44d

391d

0/29

upstream: reported C repro on 2024/11/09 08:24

linux-6.1

INFO: rcu detected stall in schedule_timeout (2) origin:lts-only

12d

93d

0/3

upstream: reported C repro on 2025/09/02 23:57

upstream

INFO: rcu detected stall in schedule_timeout (2) kernel

2158d

0/29

closed as invalid on 2020/01/08 05:23

upstream

INFO: rcu detected stall in schedule_timeout (4) kernel

863d

0/29

closed as invalid on 2023/09/01 06:44

linux-6.1

INFO: rcu detected stall in schedule_timeout

531d

596d

0/3

auto-obsoleted due to no activity on 2024/08/31 04:44

upstream

INFO: rcu detected stall in schedule_timeout (5) kernel

768d

804d

0/29

auto-obsoleted due to no activity on 2024/01/26 16:31

upstream

INFO: rcu detected stall in schedule_timeout cgroups mm

2193d

2194d

0/29

closed as invalid on 2019/12/04 14:14

upstream

INFO: rcu detected stall in schedule_timeout (6) usb

done

410d

567d

28/29

fixed on 2024/10/22 11:57

linux-6.6

INFO: rcu detected stall in schedule_timeout origin:upstream

2d05h

30d

0/2

upstream: reported C repro on 2025/11/04 19:17

Created	Duration	User	Repo	Result
2025/10/12 04:30	13m	retest repro	linux-5.15.y	report log
2025/09/27 14:13	11m	retest repro	linux-5.15.y	report log
2025/09/27 14:13	11m	retest repro	linux-5.15.y	report log
2025/09/27 14:13	11m	retest repro	linux-5.15.y	report log
2025/09/27 14:13	13m	retest repro	linux-5.15.y	report log

Created

Duration

User

Patch

Repo

Result

2025/10/12 04:30

13m

retest repro

linux-5.15.y

report log

2025/09/27 14:13

11m

retest repro

linux-5.15.y

report log

2025/09/27 14:13

11m

retest repro

linux-5.15.y

report log

2025/09/27 14:13

11m

retest repro

linux-5.15.y

report log

2025/09/27 14:13

13m

retest repro

linux-5.15.y

report log


Created	Duration	User	Repo	Result
2025/11/07 09:13	2h33m	bisect fix	linux-5.15.y	OK (0) job log log
2025/07/28 12:27	1h21m	bisect fix	linux-5.15.y	OK (0) job log log
2025/06/27 16:40	2h07m	bisect fix	linux-5.15.y	OK (0) job log log
2025/05/28 13:53	1h57m	bisect fix	linux-5.15.y	OK (0) job log log
2025/04/24 11:55	2h20m	bisect fix	linux-5.15.y	OK (0) job log log
2025/03/20 08:51	2h13m	bisect fix	linux-5.15.y	OK (0) job log log
2025/02/17 10:09	1h32m	bisect fix	linux-5.15.y	OK (0) job log log
2025/01/17 09:51	1h35m	bisect fix	linux-5.15.y	OK (0) job log log
2024/11/28 09:00	1h06m	bisect fix	linux-5.15.y	OK (0) job log log
2024/10/20 04:58	1h50m	bisect fix	linux-5.15.y	OK (0) job log log
2024/09/03 16:59	1h37m	bisect fix	linux-5.15.y	OK (0) job log log
2024/07/27 12:36	1h26m	bisect fix	linux-5.15.y	OK (0) job log log

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4203/1:b..l (detected by 0, t=10502 jiffies, g=3921, q=50) task:syz-executor374 state:R running task stack:29312 pid: 4203 ppid: 4191 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5049 [inline] __schedule+0x11bb/0x4390 kernel/sched/core.c:6395 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571 preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6596 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:403 [inline] filemap_map_pages+0x1031/0x1390 mm/filemap.c:3353 do_fault_around mm/memory.c:4243 [inline] do_read_fault mm/memory.c:4258 [inline] do_fault mm/memory.c:4392 [inline] handle_pte_fault mm/memory.c:4650 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x2580/0x43c0 mm/memory.c:4883 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357 handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 RIP: 0033:0x7fd9aff93fa0 RSP: 002b:00007fd9aff33198 EFLAGS: 00010246 RAX: fffffffffffffec0 RBX: 00007fd9aff336c0 RCX: 00007fd9affaad99 RDX: 00007fd9aff33d78 RSI: 0000000000000058 RDI: 00007fd9aff336c0 RBP: 0000000000000000 R08: 00007fd9aff336c0 R09: 00007ffca61df647 R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffb0 R13: 0000000000000000 R14: 00007ffca61df560 R15: 00007ffca61df648 </TASK> rcu: rcu_preempt kthread starved for 10518 jiffies! g3921 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:28032 pid: 15 ppid: 2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5049 [inline] __schedule+0x11bb/0x4390 kernel/sched/core.c:6395 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799 irqentry_exit+0x63/0x70 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:timer_delete_sync+0x158/0x260 kernel/time/timer.c:1403 Code: 00 4d 85 ed 75 16 e8 67 9c 10 00 eb 15 e8 60 9c 10 00 e8 9b bf 41 08 4d 85 ed 74 ea e8 51 9c 10 00 fb 65 44 8b 35 f0 40 9b 7e <44> 89 f6 81 e6 00 00 0f 00 31 ff e8 98 9f 10 00 41 81 e6 00 00 0f RSP: 0018:ffffc90000d47b00 EFLAGS: 00000293 RAX: ffffffff81672ecf RBX: ffffc90000d47be0 RCX: ffff88813feabb80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000d47bb0 R08: dffffc0000000000 R09: fffffbfff1ad323e R10: fffffbfff1ad323e R11: 1ffffffff1ad323d R12: dffffc0000000000 R13: 0000000000000200 R14: 0000000080000000 R15: 1ffff920001a8f60 del_timer_sync include/linux/timer.h:198 [inline] schedule_timeout+0x164/0x280 kernel/time/timer.c:1915 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 </TASK> rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 0 CPU: 0 PID: 4199 Comm: syz-executor374 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: <IRQ> dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_check_gp_kthread_starvation+0x1cd/0x250 kernel/rcu/tree_stall.h:487 print_other_cpu_stall+0x10c8/0x1220 kernel/rcu/tree_stall.h:592 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline] rcu_pending kernel/rcu/tree.c:3936 [inline] rcu_sched_clock_irq+0x831/0x1110 kernel/rcu/tree.c:2619 update_process_times+0x193/0x200 kernel/time/timer.c:1818 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473 __run_hrtimer kernel/time/hrtimer.c:1690 [inline] __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1754 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1816 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline] __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:lock_acquire+0x1f2/0x3f0 kernel/locking/lockdep.c:5627 Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f6 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b RSP: 0018:ffffc90002eaf9c0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 6356f938c2ca3700 RDX: 0000000000000000 RSI: ffffffff8a0b2ac0 RDI: ffffffff8a59a480 RBP: ffffc90002eafad8 R08: dffffc0000000000 R09: fffffbfff1ff781f R10: fffffbfff1ff781f R11: 1ffffffff1ff781e R12: ffff8880793c8128 R13: 1ffff920005d5f44 R14: 0000000000000246 R15: dffffc0000000000 __might_fault+0xb3/0x110 mm/memory.c:5357 __copy_to_user include/linux/uaccess.h:143 [inline] save_xstate_epilog arch/x86/kernel/fpu/signal.c:104 [inline] copy_fpstate_to_sigframe+0x882/0xb90 arch/x86/kernel/fpu/signal.c:217 get_sigframe arch/x86/kernel/signal.c:295 [inline] __setup_rt_frame arch/x86/kernel/signal.c:471 [inline] setup_rt_frame arch/x86/kernel/signal.c:780 [inline] handle_signal arch/x86/kernel/signal.c:824 [inline] arch_do_signal_or_restart+0x67a/0x1300 arch/x86/kernel/signal.c:869 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fd9aff7afc7 Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 1c 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 RSP: 002b:00007fd9aff33178 EFLAGS: 00000246 RAX: 00000000000000ca RBX: 00007fd9afffd308 RCX: 00007fd9aff7afc9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd9afffd308 RBP: 00007fd9afffd300 R08: 00007fd9aff336c0 R09: 00007fd9aff336c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd9afffd30c R13: 0000000000000000 R14: 00007ffca61df560 R15: 00007ffca61df648 </TASK>

Crashes (12):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/09/13 04:10	linux-5.15.y	43bb85222e53	e2beed91	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in schedule_timeout
2025/09/13 00:10	linux-5.15.y	43bb85222e53	e2beed91	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in schedule_timeout
2024/05/23 05:50	linux-5.15.y	83655231580b	4d098039	.config	console log	report	syz	C		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in schedule_timeout
2025/09/13 06:02	linux-5.15.y	43bb85222e53	e2beed91	.config	console log	report	syz / log			[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in schedule_timeout
2025/09/01 03:21	linux-5.15.y	01879f56bdde	807a3b61	.config	console log	report	syz / log			[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in schedule_timeout
2024/06/10 21:57	linux-5.15.y	c61bd26ae81a	048c640a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in schedule_timeout
2024/06/10 21:53	linux-5.15.y	c61bd26ae81a	048c640a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in schedule_timeout
2024/05/23 03:37	linux-5.15.y	83655231580b	4d098039	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in schedule_timeout
2024/05/22 14:44	linux-5.15.y	83655231580b	4d098039	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in schedule_timeout
2024/12/05 01:45	linux-5.15.y	0a51d2d4527b	b50eb251	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	INFO: rcu detected stall in schedule_timeout
2024/09/18 12:18	linux-5.15.y	3a5928702e71	c673ca06	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	INFO: rcu detected stall in schedule_timeout
2024/08/01 21:04	linux-5.15.y	7e89efd3ae1c	1e9c4cf3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	INFO: rcu detected stall in schedule_timeout

Crashes (12):

Assets (help?)