INFO: rcu detected stall in perf

Date	Name	Commit	Repro	Result
2025/11/02	linux-5.15.y (ToT)	cc5ec8769306	syz	[report] INFO: rcu detected stall in corrupted
2025/11/02	upstream (ToT)	691d401c7e0e	syz	Didn't crash

Date

Name

Commit

Repro

Result

2025/11/02

linux-5.15.y (ToT)

cc5ec8769306

syz

[report] INFO: rcu detected stall in corrupted

2025/11/02

upstream (ToT)

691d401c7e0e

syz

Didn't crash

Kernel	Title	Rank 🛈	Repro	Fix bisect	Count	Last	Reported	Patched	Status
linux-6.6	INFO: rcu detected stall in perf_release (2) origin:lts-only	1	C	error	2	57d	165d	0/2	upstream: reported C repro on 2026/01/03 14:19
linux-6.1	INFO: rcu detected stall in perf_release	1			2	638d	638d	0/3	auto-obsoleted due to no activity on 2024/12/25 21:00
linux-6.1	INFO: rcu detected stall in perf_release (2)	1	C	inconclusive	3	202d	252d	0/3	auto-obsoleted due to no activity on 2026/03/07 13:59
linux-6.6	INFO: rcu detected stall in perf_release	1	C	done	1	293d	293d	2/2	fixed on 2025/10/06 10:09
upstream	INFO: rcu detected stall in perf_release mm cgroups	1			19	2387d	2408d	0/29	auto-closed as invalid on 2020/03/03 09:44
android-5-15	BUG: soft lockup in perf_release (2)	1			1	445d	445d	0/2	auto-obsoleted due to no activity on 2025/06/27 12:18
android-5-15	BUG: soft lockup in perf_release	1			3	726d	788d	0/2	auto-obsoleted due to no activity on 2024/09/19 17:30

Created	Duration	User	Repo	Result
2026/03/23 01:25	13m	retest repro	linux-5.15.y	report log
2026/03/19 15:22	8m	retest repro	linux-5.15.y	error
2026/01/11 16:20	19m	retest repro	linux-5.15.y	report log
2026/01/08 07:53	15m	retest repro	linux-5.15.y	report log

Created

Duration

User

Patch

Repo

Result

2026/03/23 01:25

13m

retest repro

linux-5.15.y

report log

2026/03/19 15:22

retest repro

linux-5.15.y

error

2026/01/11 16:20

19m

retest repro

linux-5.15.y

report log

2026/01/08 07:53

15m

retest repro

linux-5.15.y

report log

Created	Duration	User	Repo	Result
2026/03/25 22:39	1m	fix candidate	upstream	error job log
2026/02/21 18:18	0m	fix candidate	upstream	error job log
2026/01/22 13:36	1m	fix candidate	upstream	error job log
2025/12/13 13:46	16m	fix candidate	upstream	error job log

Created

Duration

User

Patch

Repo

Result

2026/03/25 22:39

fix candidate

upstream

error job log

2026/02/21 18:18

fix candidate

upstream

error job log

2026/01/22 13:36

fix candidate

upstream

error job log

2025/12/13 13:46

16m

fix candidate

upstream

error job log

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=7db/1/0x4000000000000002 softirq=24393/24395 fqs=2 (detected by 1, t=10505 jiffies, g=33321, q=557) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8152 Comm: syz.4.3567 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffffc90000006fb8 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 1ffff92000000dfc RCX: 0000000000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8880b903b200 RBP: ffffc900000070a0 R08: ffff8880b903b1ff R09: ffff8880b903b1f0 R10: dffffc0000000000 R11: ffffed1017207640 R12: ffff8880b903b208 R13: dffffc0000000000 R14: ffff8880b903b200 R15: 1ffff11017207641 FS: 0000555579bf3500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557c294a38 CR3: 000000007aa47000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> init_irq_work include/linux/irq_work.h:36 [inline] rcu_read_unlock_special+0x32a/0x4a0 kernel/rcu/tree_plugin.h:665 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] __perf_event_output kernel/events/core.c:7813 [inline] perf_event_output_forward+0x255/0x2e0 kernel/events/core.c:7822 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515 perf_swevent_overflow kernel/events/core.c:9591 [inline] perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629 perf_tp_event+0x383/0xbf0 kernel/events/core.c:10047 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 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 f2 cc 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc90000007780 EFLAGS: 00000206 RAX: 2d403fcffe0c8b00 RBX: 1ffff92000000ef4 RCX: 2d403fcffe0c8b00 RDX: dffffc0000000000 RSI: ffffffff8a2b3180 RDI: ffffffff8a7a09c0 RBP: ffffc90000007860 R08: ffffffff901d815f R09: 1ffffffff203b02b R10: dffffc0000000000 R11: fffffbfff203b02c R12: ffffffff8c323800 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] __ip_queue_xmit+0x1242/0x1c00 net/ipv4/ip_output.c:539 __tcp_transmit_skb+0x1d11/0x3200 net/ipv4/tcp_output.c:1404 tcp_delack_timer_handler+0x32e/0x730 net/ipv4/tcp_timer.c:314 tcp_delack_timer+0x188/0x2e0 net/ipv4/tcp_timer.c:341 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x53e/0x800 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x339/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 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:call_rcu+0x6d6/0x950 kernel/rcu/tree.c:3092 Code: f7 84 24 a0 00 00 00 00 02 00 00 43 c6 44 25 04 f8 75 4f f7 44 24 58 00 02 00 00 74 01 fb 48 c7 84 24 80 00 00 00 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 08 00 00 00 00 65 48 8b 04 RSP: 0018:ffffc90004e7fbc0 EFLAGS: 00000206 RAX: 2d403fcffe0c8b00 RBX: ffff88807c544c90 RCX: 2d403fcffe0c8b00 RDX: dffffc0000000000 RSI: ffffffff8a2b3180 RDI: ffffffff8a7a09c0 RBP: ffffc90004e7fcf0 R08: ffff8880b903b30b R09: 1ffff11017207661 R10: dffffc0000000000 R11: ffffed1017207662 R12: dffffc0000000000 R13: 1ffff920009cff88 R14: 1ffff11017207654 R15: 000000000000001a put_event kernel/events/core.c:5258 [inline] perf_event_release_kernel+0x83e/0x8d0 kernel/events/core.c:5383 perf_release+0x37/0x40 kernel/events/core.c:5393 __fput+0x234/0x930 fs/file_table.c:311 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 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: 0033:0x7f59cccabe59 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:00007ffe2728d238 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffe2728d320 RCX: 00007f59cccabe59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000003a057 R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b32420000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f59ccf24fac R14: 00007f59ccf24fa8 R15: 00007f59ccf24fa0 </TASK> rcu: rcu_preempt kthread starved for 10495 jiffies! g33321 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:26736 pid: 15 ppid: 2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5049 [inline] __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395 schedule+0x11b/0x1e0 kernel/sched/core.c:6478 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972 rcu_gp_kthread+0x9b/0x370 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 1 CPU: 1 PID: 7425 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: <IRQ> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 nmi_cpu_backtrace+0x3a2/0x3d0 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+0x1110/0x1270 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+0x843/0x1120 kernel/rcu/tree.c:2619 update_process_times+0x193/0x200 kernel/time/timer.c:2021 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:1685 [inline] __hrtimer_run_queues+0x4b4/0xb70 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811 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+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:kvm_wait+0x159/0x1b0 arch/x86/kernel/kvm.c:918 Code: 89 df 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 4b 0f b6 1f e8 f7 bb 4a 00 44 38 e3 75 10 66 90 0f 00 2d b9 cc f3 08 fb f4 <e9> 16 ff ff ff fb e9 10 ff ff ff e8 a7 c0 88 08 89 f9 80 e1 07 38 RSP: 0018:ffffc90000dd08c0 EFLAGS: 00000246 RAX: 0825d233384f9700 RBX: 0000000000000003 RCX: 0825d233384f9700 RDX: dffffc0000000000 RSI: ffffffff8a2b3180 RDI: ffffffff8a7a09c0 RBP: ffffc90000dd0970 R08: ffffffff901d815f R09: 1ffffffff203b02b R10: dffffc0000000000 R11: fffffbfff203b02c R12: 0000000000000003 R13: ffff8880b913b154 R14: dffffc0000000000 R15: 1ffff920001ba118 pv_wait arch/x86/include/asm/paravirt.h:597 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x60f/0x9c0 kernel/locking/qspinlock.c:508 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline] queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock+0x265/0x2f0 kernel/locking/spinlock_debug.c:115 spin_lock include/linux/spinlock.h:364 [inline] tcp_write_timer+0x29/0x280 net/ipv4/tcp_timer.c:673 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x53e/0x800 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x339/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 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:unwind_next_frame+0x3/0x1d90 arch/x86/kernel/unwind_orc.c:423 Code: 5b 41 5e 41 5f c3 89 d9 80 e1 07 80 c1 03 38 c1 7c 97 48 89 df e8 7d 34 89 00 eb 8d 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 <41> 56 41 55 41 54 53 48 81 ec 88 00 00 00 48 89 fb 49 be 00 00 00 RSP: 0018:ffffc90004e3f970 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc90004e3fa40 RCX: 0000000080000001 RDX: dffffc0000000000 RSI: ffffffff8876da18 RDI: ffffc90004e3f988 RBP: ffffc90004e3fa10 R08: ffffc90004e3fa50 R09: 0000000000000005 R10: dffffc0000000000 R11: fffff520009c7f3d R12: ffff88802078d940 R13: dffffc0000000000 R14: ffffffff8167c1b0 R15: ffffc90004e3f988 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] apparmor_sk_alloc_security+0x74/0x100 security/apparmor/lsm.c:785 security_sk_alloc+0x6a/0xa0 security/security.c:2309 sk_prot_alloc+0x101/0x210 net/core/sock.c:1869 sk_alloc+0x2f/0x310 net/core/sock.c:1922 inet_create+0x728/0xef0 net/ipv4/af_inet.c:322 __sock_create+0x47b/0x900 net/socket.c:1495 sock_create net/socket.c:1551 [inline] __sys_socket+0xe2/0x170 net/socket.c:1593 __do_sys_socket net/socket.c:1602 [inline] __se_sys_socket net/socket.c:1600 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1600 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f243d88d6c7 Code: f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 29 00 00 00 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:00007ffc6365a418 EFLAGS: 00000202 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f243dad6460 RCX: 00007f243d88d6c7 RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002 RBP: 00007ffc6365ab3c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000051 R13: 00000000000927c0 R14: 0000000000000000 R15: 00007ffc6365ab90 </TASK>

Crashes (4):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info	Assets (help?)	Manager	Title
2026/06/08 11:06	linux-5.15.y	dc027a595035	cc095639	.config	console log	report	syz / log		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-perf	INFO: rcu detected stall in perf_release
2025/12/24 17:25	linux-5.15.y	68efe5a6c16a	d6526ea3	.config	console log	report	syz / log		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-perf	INFO: rcu detected stall in perf_release
2025/11/02 03:40	linux-5.15.y	cc5ec8769306	2c50b6a9	.config	console log	report	syz / log		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-perf	INFO: rcu detected stall in perf_release
2026/02/12 23:30	linux-5.15.y	e45d5d41c134	504cb1bf	.config	console log	report		info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-perf	INFO: rcu detected stall in perf_release

Crashes (4):

Assets (help?)