INFO: rcu detected stall in sys_close

Date	Name	Commit	Repro	Result
2026/02/10	linux-6.1.y (ToT)	0182cb5b74ee	C	[report] INFO: rcu detected stall in sys_clone
2026/02/10	upstream (ToT)	a9aabb3b839a	C	Didn't crash

Date

Name

Commit

Repro

Result

2026/02/10

linux-6.1.y (ToT)

0182cb5b74ee

[report] INFO: rcu detected stall in sys_clone

2026/02/10

upstream (ToT)

a9aabb3b839a

Didn't crash

Kernel	Title	Rank 🛈	Repro	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in close_range fs	1			1	302d	302d	0/29	auto-obsoleted due to no activity on 2025/07/22 12:43
linux-6.1	INFO: rcu detected stall in sys_close_range	1	C	done	3	159d	352d	0/3	auto-obsoleted due to no activity on 2025/12/22 06:21
linux-6.6	INFO: rcu detected stall in sys_close_range origin:lts-only	1	C	inconclusive	3	14d	189d	0/2	upstream: reported C repro on 2025/08/13 16:29
linux-5.15	INFO: rcu detected stall in sys_close_range origin:lts-only	1	syz	error	3	35d	109d	0/3	upstream: reported syz repro on 2025/11/02 13:19

Created	Duration	User	Patch	Repo	Result
2026/02/11 07:41	1m	fix candidate		upstream	error job log

Created

Duration

User

Patch

Repo

Result

2026/02/11 07:41

fix candidate

upstream

error job log

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2655 jiffies s: 3553 root: 0x2/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4586 Comm: syz.3.80 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:asm_sysvec_irq_work+0x0/0x20 arch/x86/include/asm/idtentry.h:722 Code: e9 b5 03 00 00 90 90 90 90 90 0f 01 ca fc 6a ff e8 b5 02 00 00 48 89 c4 48 89 e7 e8 9a 60 ec ff e9 95 03 00 00 90 90 90 90 90 <0f> 01 ca fc 6a ff e8 95 02 00 00 48 89 c4 48 89 e7 e8 6a 65 ec ff RSP: 0018:ffffc900001e0998 EFLAGS: 00000006 RAX: e3f024cdbb7c7700 RBX: 1ffff9200003c140 RCX: e3f024cdbb7c7700 RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0d20 RBP: ffffc900001e0ac0 R08: ffff8880b8f3580b R09: 1ffff110171e6b01 R10: dffffc0000000000 R11: ffffed10171e6b02 R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002 FS: 000055556677c500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe55369e60 CR3: 000000005e619000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> 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:ffffc900001e09c0 EFLAGS: 00000206 __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:__kasan_record_aux_stack+0x9f/0xc0 mm/kasan/generic.c:485 Code: 0f af f0 48 01 fe 49 39 f6 77 03 4c 89 f6 4c 89 ff e8 75 2a ff ff 49 63 8f bc 00 00 00 48 85 c9 74 1e 48 01 c8 74 19 8b 48 08 <89> 48 0c 0f b6 f3 bf 00 08 00 00 48 89 c3 e8 4e dc ff ff 89 43 08 RSP: 0018:ffffc90003cf7ce0 EFLAGS: 00000286 RAX: ffff888024e53d48 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888024e53b80 RDI: ffff888140009a00 RBP: ffffc90003cf7da8 R08: 0000000000000280 R09: 1ffffffff1c3f96d R10: dffffc0000000000 R11: fffffbfff1c3f96e R12: ffff88802ff99dc0 R13: dffffc0000000000 R14: ffff888024e53b80 R15: ffff888140009a00 task_work_add+0x7f/0x330 kernel/task_work.c:48 fput+0xd9/0x1a0 fs/file_table.c:376 filp_close+0x108/0x150 fs/open.c:1439 __range_close fs/file.c:703 [inline] __close_range+0x58b/0x780 fs/file.c:753 __do_sys_close_range fs/open.c:1478 [inline] __se_sys_close_range fs/open.c:1475 [inline] __x64_sys_close_range+0x76/0x80 fs/open.c:1475 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f947df9bf79 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff169eaf18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: ffffffffffffffda RBX: 00007fff169eb000 RCX: 00007f947df9bf79 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 0000000000017d2d R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2f120000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f947e215fac R14: 00007f947e215fa8 R15: 00007f947e215fa0 </TASK>

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/02/10 20:38	linux-6.1.y	0182cb5b74ee	91d776d3	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	INFO: rcu detected stall in sys_close_range

Crashes (1):

Assets (help?)