INFO: rcu detected stall in try_check

Date	Name	Commit	Repro	Result
2026/02/17	linux-6.1.y (ToT)	8ce36b2849ef	C	[report] INFO: rcu detected stall in corrupted
2026/02/17	upstream (ToT)	970296997869	C	Didn't crash

Date

Name

Commit

Repro

Result

2026/02/17

linux-6.1.y (ToT)

8ce36b2849ef

[report] INFO: rcu detected stall in corrupted

2026/02/17

upstream (ToT)

970296997869

Didn't crash

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in try_check_zero kernel	1				66	2122d	2564d	0/29	auto-closed as invalid on 2020/09/05 16:29
upstream	INFO: rcu detected stall in try_check_zero (5) kernel	1	syz	error	error	2	46d	422d	0/29	upstream: reported syz repro on 2025/01/02 10:34
upstream	INFO: rcu detected stall in try_check_zero (2) kernel	1				1	1991d	1991d	0/29	auto-closed as invalid on 2020/12/15 14:13
upstream	INFO: rcu detected stall in try_check_zero (3) kernel	1				2	1507d	1511d	0/29	closed as invalid on 2022/02/08 10:10
upstream	INFO: rcu detected stall in try_check_zero (4) kernel	1				2	1000d	1067d	0/29	auto-obsoleted due to no activity on 2023/09/02 21:24
linux-6.1	INFO: rcu detected stall in try_check_zero	1				1	470d	470d	0/3	auto-obsoleted due to no activity on 2025/02/23 21:01

Created	Duration	User	Patch	Repo	Result
2026/02/17 19:29	1m	fix candidate		upstream	error job log

Created

Duration

User

Patch

Repo

Result

2026/02/17 19:29

fix candidate

upstream

error job log

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2666 jiffies s: 3565 root: 0x1/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4348 Comm: kworker/0:9 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: rcu_gp process_srcu RIP: 0010:match_held_lock+0x5/0xb0 kernel/locking/lockdep.c:5108 Code: c7 c7 c0 10 8c 8a 48 c7 c6 00 11 8c 8a e8 23 49 21 f7 0f 0b eb b6 e8 ca fa ff ff 66 2e 0f 1f 84 00 00 00 00 00 b9 01 00 00 00 <48> 39 77 10 74 6c 53 81 7f 20 00 00 10 00 72 5f 48 8b 46 08 48 85 RSP: 0018:ffffc90000007650 EFLAGS: 00000097 RAX: 0000000000000000 RBX: ffff88807b878000 RCX: 0000000000000001 RDX: ffff88807b878000 RSI: ffffffff8cb2d620 RDI: ffff88807b878ae0 RBP: 00000000ffffffff R08: dffffc0000000000 R09: 1ffffffff215ea48 R10: dffffc0000000000 R11: fffffbfff215ea49 R12: 0000000000000000 R13: 0000000000000046 R14: ffffffff8cb2d620 R15: ffff88807b878ae0 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3bd8f4da08 CR3: 000000005e630000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> __lock_is_held kernel/locking/lockdep.c:5403 [inline] lock_is_held_type+0xa6/0x190 kernel/locking/lockdep.c:5705 trace_call_bpf+0x19e/0x6b0 kernel/trace/bpf_trace.c:135 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:9997 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728 RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc900000079c0 EFLAGS: 00000206 RAX: 0c33a682d6e6f300 RBX: 1ffff92000000f40 RCX: 0c33a682d6e6f300 RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0d20 RBP: ffffc90000007ac0 R08: ffffffff90af525f R09: 1ffffffff215ea4b R10: dffffc0000000000 R11: fffffbfff215ea4c R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8e3b900 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] process_backlog+0x410/0x6f0 net/core/dev.c:6037 __napi_poll+0xc0/0x460 net/core/dev.c:6603 napi_poll net/core/dev.c:6670 [inline] net_rx_action+0x5dd/0xb20 net/core/dev.c:6784 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:delay_tsc+0x57/0xc0 arch/x86/lib/delay.c:79 Code: 90 49 89 d7 49 c1 e7 20 49 09 c7 4d 29 f7 49 39 df 73 53 bf 01 00 00 00 e8 76 d8 38 f7 65 8b 05 37 5d e2 75 85 c0 74 1c f3 90 <bf> 01 00 00 00 e8 cf d6 38 f7 e8 fa 97 0c 00 39 c5 75 0e 0f 01 f9 RSP: 0018:ffffc90003207ab8 EFLAGS: 00000286 RAX: 0000000080000000 RBX: 0000000000002af9 RCX: 0000000000000000 RDX: 0000000000000037 RSI: ffffffff8adf0d00 RDI: 00000000ffffffff RBP: 0000000000000000 R08: ffffffff8e1fcc2f R09: 1ffffffff1c3f985 R10: dffffc0000000000 R11: fffffbfff1c3f986 R12: ffff8880b8f44000 R13: dffffc0000000000 R14: 000000379d5ff98f R15: 00000000000021df try_check_zero+0x3bf/0x3e0 kernel/rcu/srcutree.c:975 srcu_advance_state kernel/rcu/srcutree.c:1549 [inline] process_srcu+0x1a0/0x1180 kernel/rcu/srcutree.c:1651 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK>

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/02/16 13:40	linux-6.1.y	8ce36b2849ef	1e62d198	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	INFO: rcu detected stall in try_check_zero

Crashes (1):

Assets (help?)