syzbot
INFO: rcu detected stall in perf_release (3)
Status:
upstream: reported C repro on 2026/06/17 21:48
Bug presence:
origin:lts-only
[Documentation on labels]
Reported-by: syzbot+979a4989b13b8f2ee852@syzkaller.appspotmail.com
First crash: 116d, last: 30d
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Bug presence (2)
| Date |
Name |
Commit |
Repro |
Result |
| 2026/08/15 |
linux-6.1.y (ToT) |
e4f7d8be268e |
C
|
[report] INFO: rcu detected stall in perf_event_open
|
| 2026/08/15 |
upstream (ToT) |
3eb40771c00a |
C
|
Didn't crash |
Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (1 GPs behind) idle=4ca4/1/0x4000000000000000 softirq=10877/10879 fqs=5220
(t=10501 jiffies g=11281 q=4887 ncpus=2)
CPU: 1 PID: 4493 Comm: syz.2.19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__ieee80211_queue_skb_to_iface net/mac80211/rx.c:234 [inline]
RIP: 0010:ieee80211_queue_skb_to_iface net/mac80211/rx.c:243 [inline]
RIP: 0010:ieee80211_rx_h_mgmt+0x4b7/0x690 net/mac80211/rx.c:3911
Code: 81 c5 c8 0b 00 00 48 89 ee e8 75 a0 d8 ff 4d 85 ff 74 26 e8 1b 1e d1 f7 49 81 c7 80 0b 00 00 4c 89 f8 48 c1 e8 03 80 3c 18 00 <74> 08 4c 89 ff e8 3f 5b 22 f8 49 ff 07 eb 05 e8 f5 1d d1 f7 b8 03
RSP: 0018:ffffc900001e0538 EFLAGS: 00000246
RAX: 1ffff1100ec9d970 RBX: dffffc0000000000 RCX: ffff88801c2e5a00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807d90d848 R08: ffffffff90b1333f R09: 1ffffffff2162667
R10: dffffc0000000000 R11: fffffbfff2162668 R12: ffff8880275b53c0
R13: 1ffff11004eb6a82 R14: ffff88805cea8ea0 R15: ffff8880764ecb80
FS: 0000555579869500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000002caca CR3: 0000000026db0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
ieee80211_rx_handlers+0x6177/0x76e0 net/mac80211/rx.c:4074
ieee80211_invoke_rx_handlers net/mac80211/rx.c:4104 [inline]
ieee80211_prepare_and_rx_handle+0x2007/0x61e0 net/mac80211/rx.c:4929
__ieee80211_rx_handle_packet net/mac80211/rx.c:5187 [inline]
ieee80211_rx_list+0x25fd/0x2e40 net/mac80211/rx.c:5317
ieee80211_rx_napi+0x1aa/0x3c0 net/mac80211/rx.c:5340
ieee80211_rx include/net/mac80211.h:4849 [inline]
ieee80211_handle_queued_frames+0x104/0x1a0 net/mac80211/main.c:317
tasklet_action_common+0x2d0/0x460 kernel/softirq.c:827
handle_softirqs+0x291/0x910 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:lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5680
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f0 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 43 c7 44 3d 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc90003517940 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 88d59340c1f37c00
RDX: ffffffff90683160 RSI: ffffffff8a8c2a20 RDI: ffffffff8adf6420
RBP: ffffc90003517a48 R08: dffffc0000000000 R09: 1ffffffff2676310
R10: dffffc0000000000 R11: ffffffff933b1884 R12: 0000000000000001
R13: 1ffff920006a2f34 R14: 0000000000000246 R15: dffffc0000000000
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747
perf_event_ctx_lock_nested+0x3b5/0x490 kernel/events/core.c:1309
perf_event_ctx_lock kernel/events/core.c:1322 [inline]
perf_event_release_kernel+0x17e/0x850 kernel/events/core.c:5199
perf_release+0x37/0x40 kernel/events/core.c:5307
__fput+0x20a/0x8b0 fs/file_table.c:320
task_work_run+0x1d0/0x260 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7b16f9e159
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:00007fff26556328 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff26556410 RCX: 00007f7b16f9e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000002caca R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2f720000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b17225fac R14: 00007f7b17225fa8 R15: 00007f7b17225fa0
</TASK>
* Struck through repros no longer work on HEAD.