INFO: rcu detected stall in process_one

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-5.15	INFO: rcu detected stall in process_one_work	1				3	770d	873d	0/3	auto-obsoleted due to no activity on 2024/09/27 05:22
linux-5.15	INFO: rcu detected stall in process_one_work (3) origin:upstream	1	syz		error	3	203d	319d	0/3	upstream: reported syz repro on 2025/09/13 13:36
upstream	INFO: rcu detected stall in process_one_work (4) kernel	1				1	1774d	1774d	0/29	auto-closed as invalid on 2021/12/18 04:26
upstream	INFO: rcu detected stall in process_one_work (8) kernel	1				3	952d	1002d	0/29	auto-obsoleted due to no activity on 2024/03/18 23:07
linux-5.15	INFO: rcu detected stall in process_one_work (2)	1				1	588d	588d	0/3	auto-obsoleted due to no activity on 2025/03/27 21:48
upstream	INFO: rcu detected stall in process_one_work kernel	1				8	2539d	2981d	0/29	auto-closed as invalid on 2019/11/14 14:39
upstream	INFO: rcu detected stall in process_one_work (9) prio:high kernel	1	syz, C	error	error	21	17d	786d	0/29	upstream: reported C repro on 2024/06/03 12:55
upstream	INFO: rcu detected stall in process_one_work (5) kernel	1				1	1420d	1420d	0/29	auto-obsoleted due to no activity on 2022/12/07 18:00
linux-6.1	INFO: rcu detected stall in process_one_work origin:upstream	1	syz, C		error	3	20h01m	932d	0/3	upstream: reported C repro on 2024/01/09 18:19
upstream	INFO: rcu detected stall in process_one_work (3) kernel	1	syz, C	done	done	1	2121d	2163d	15/29	fixed on 2020/11/16 12:12

rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 ticks this GP) idle=64a/1/0x4000000000000002 softirq=32811/32811 fqs=0 (t=10994 jiffies g=46533 q=73) rcu: rcu_preempt kthread starved for 10994 jiffies! g46533 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28848 10 2 0x80004000 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 schedule_timeout+0x35c/0x850 kernel/time/timer.c:1898 rcu_gp_fqs_loop kernel/rcu/tree.c:1674 [inline] rcu_gp_kthread+0x9bf/0x1960 kernel/rcu/tree.c:1836 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 2681 Comm: kworker/1:2 Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: rcu_gp process_srcu Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x19b/0x1e5 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3225 [inline] rcu_sched_clock_irq.cold+0x55d/0xcfa kernel/rcu/tree.c:2296 update_process_times+0x25/0x60 kernel/time/timer.c:1727 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1320 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x5ca/0xed0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline] smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 </IRQ> RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199 Code: c0 30 98 94 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 8e b5 c4 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 3b 12 7f f9 65 8b 05 0c 3c 32 78 85 c0 74 02 5d RSP: 0018:ffffc90007d9fd18 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1329306 RBX: 0000000000000080 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a0300a84 RBP: ffff8880ae737180 R08: ffff8880a03001c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000080 R13: ffffc90001712f30 R14: ffff8880a0eb4900 R15: ffff8880ae737180 spin_unlock_irq include/linux/spinlock.h:403 [inline] process_one_work+0x856/0x16a0 kernel/workqueue.c:2239 worker_thread+0x96/0xe20 kernel/workqueue.c:2412 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352