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WARNING in perf_pending_task

Status: upstream: reported C repro on 2025/07/03 08:45
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+dcea8245497cc56e2a7e@syzkaller.appspotmail.com
First crash: 330d, last: 1d11h
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2025/09/07 linux-6.6.y (ToT) 355bd0b51d2f C [report] WARNING in perf_pending_task
2025/07/10 upstream (ToT) bc9ff192a6c9 C [report] WARNING in perf_pending_task
2025/09/07 upstream (ToT) b236920731dd C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in perf_pending_task origin:upstream missing-backport -1 C inconclusive 1691 27m 336d 0/3 upstream: reported C repro on 2025/06/27 13:50
linux-5.15 WARNING in perf_pending_task origin:upstream -1 C 1614 1h54m 334d 0/3 upstream: reported C repro on 2025/06/29 10:30
upstream WARNING in perf_pending_task perf -1 C 35773 314d 339d 29/29 fixed on 2025/09/04 16:57
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/12/06 18:54 2h25m fix candidate upstream OK (0) job log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6112 at kernel/events/core.c:6808 perf_sigtrap kernel/events/core.c:6808 [inline]
WARNING: CPU: 0 PID: 6112 at kernel/events/core.c:6808 perf_pending_task+0x35c/0x470 kernel/events/core.c:6920
Modules linked in:
CPU: 0 PID: 6112 Comm: syz.0.110 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:perf_sigtrap kernel/events/core.c:6808 [inline]
RIP: 0010:perf_pending_task+0x35c/0x470 kernel/events/core.c:6920
Code: ff 84 db 75 14 e8 44 cc d5 ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 30 cc d5 ff e8 bb 3d 4f ff eb e5 e8 24 cc d5 ff <0f> 0b e9 f3 fe ff ff e8 18 cc d5 ff 48 c7 c7 10 f8 1c 8d 4c 89 f6
RSP: 0018:ffffc900044a7c40 EFLAGS: 00010293
RAX: ffffffff81b15fcc RBX: ffff88806174a2e0 RCX: ffff88802236bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8e8b3aef R09: 1ffffffff1d1675d
R10: dffffc0000000000 R11: fffffbfff1d1675e R12: ffff88802236bc00
R13: ffff88801cae6130 R14: ffff88806174a0a0 R15: 1ffff1100c2e9414
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c6c157f70 CR3: 000000000cf32000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x95a/0x2460 kernel/exit.c:884
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1026
 __do_sys_exit_group kernel/exit.c:1037 [inline]
 __se_sys_exit_group kernel/exit.c:1035 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0c6c19ce59
Code: Unable to access opcode bytes at 0x7f0c6c19ce2f.
RSP: 002b:00007ffcdc8eb9e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0c6c19ce59
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffcdc8eba4c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000005d
R13: 00000000000927c0 R14: 000000000001ab82 R15: 00007ffcdc8ebaa0
 </TASK>

Crashes (491):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/27 08:38 linux-6.6.y 0a40c6fbd105 2b01f00e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/27 03:09 linux-6.6.y 0a40c6fbd105 2b01f00e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/04 18:44 linux-6.6.y 258cf62a6dfd 85f1bcf2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/01/16 14:41 linux-6.6.y c596736dadab d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/21 00:09 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/18 06:31 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/11/28 14:00 linux-6.6.y 1e89a1be4fe9 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/11/27 22:12 linux-6.6.y 1e89a1be4fe9 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/11/14 16:31 linux-6.6.y 0a805b6ea8cd f7988ea4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/11/03 18:46 linux-6.6.y 0a805b6ea8cd 2c50b6a9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/10/25 00:24 linux-6.6.y 4a243110dc88 c0460fcd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/10/14 07:24 linux-6.6.y 655054d2c3c1 b6605ba8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/10/13 09:55 linux-6.6.y 655054d2c3c1 ff1712fe .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/25 21:13 linux-6.6.y 147338df3487 0abd0691 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/24 20:11 linux-6.6.y af1544b5d072 0abd0691 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/24 19:02 linux-6.6.y af1544b5d072 0abd0691 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/12 01:34 linux-6.6.y 60a9e718726f e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/08 16:09 linux-6.6.y 355bd0b51d2f d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/08 15:01 linux-6.6.y 355bd0b51d2f d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/07 02:06 linux-6.6.y 355bd0b51d2f d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/26 01:00 linux-6.6.y dbcb8d8e4163 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/20 23:34 linux-6.6.y d96eb99e2f0e 7117feec .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/19 11:42 linux-6.6.y d96eb99e2f0e 7117feec .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/10 13:27 linux-6.6.y a5df3a702b2c 956bd956 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/10/13 23:24 linux-6.6.y 655054d2c3c1 b6605ba8 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/24 21:30 linux-6.6.y af1544b5d072 0abd0691 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/09 06:22 linux-6.6.y a5df3a702b2c 4d9fdfa4 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/28 09:56 linux-6.6.y 0a40c6fbd105 4c36e7e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/28 08:16 linux-6.6.y 0a40c6fbd105 4c36e7e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/28 02:07 linux-6.6.y 0a40c6fbd105 4c36e7e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/27 19:58 linux-6.6.y 0a40c6fbd105 8777bdc3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/27 14:05 linux-6.6.y 0a40c6fbd105 8777bdc3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/26 02:55 linux-6.6.y 0a40c6fbd105 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/25 16:29 linux-6.6.y 0a40c6fbd105 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/25 13:39 linux-6.6.y 0a40c6fbd105 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/25 09:11 linux-6.6.y 0a40c6fbd105 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/25 07:26 linux-6.6.y 0a40c6fbd105 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/25 03:11 linux-6.6.y 0a40c6fbd105 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/20 17:22 linux-6.6.y eac8889a3a1c 62fb93a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/19 18:51 linux-6.6.y eac8889a3a1c 223544dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/18 21:03 linux-6.6.y eac8889a3a1c 55156e84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/17 15:15 linux-6.6.y 4d922539ad7d de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/17 05:23 linux-6.6.y 4d922539ad7d de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/16 22:21 linux-6.6.y 4d922539ad7d de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/15 07:26 linux-6.6.y 3b9f64db0496 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/15 06:12 linux-6.6.y 3b9f64db0496 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/14 10:55 linux-6.6.y 3b9f64db0496 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/14 05:35 linux-6.6.y 3b9f64db0496 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/11 14:43 linux-6.6.y 3b9f64db0496 845acb1c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/11 05:08 linux-6.6.y 3b9f64db0496 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/11 01:46 linux-6.6.y 3b9f64db0496 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/09 14:56 linux-6.6.y 3b9f64db0496 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/07 05:47 linux-6.6.y 258cf62a6dfd f250db59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/07 02:02 linux-6.6.y 258cf62a6dfd f250db59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/06 02:19 linux-6.6.y 258cf62a6dfd 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/05 11:35 linux-6.6.y 258cf62a6dfd 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/04 09:18 linux-6.6.y 258cf62a6dfd 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/04 02:08 linux-6.6.y 258cf62a6dfd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/04 00:48 linux-6.6.y 258cf62a6dfd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/03 21:38 linux-6.6.y 258cf62a6dfd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/03 18:47 linux-6.6.y 258cf62a6dfd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/03 17:35 linux-6.6.y 258cf62a6dfd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/03 06:54 linux-6.6.y 258cf62a6dfd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/03 02:38 linux-6.6.y 258cf62a6dfd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/02 20:46 linux-6.6.y 258cf62a6dfd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/01 16:47 linux-6.6.y 258cf62a6dfd 753c55b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/01 08:58 linux-6.6.y 258cf62a6dfd 753c55b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/04/30 17:59 linux-6.6.y 258cf62a6dfd a7464baf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/04/30 08:03 linux-6.6.y 142cd8382222 005438fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/04/28 06:49 linux-6.6.y 142cd8382222 ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/04/27 15:48 linux-6.6.y 142cd8382222 0f700595 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/04/27 09:51 linux-6.6.y 9760bf04666d 0f700595 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/04/27 08:22 linux-6.6.y 9760bf04666d 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/04/26 21:54 linux-6.6.y 9760bf04666d 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/03 08:44 linux-6.6.y 3f5b4c104b7d 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
* Struck through repros no longer work on HEAD.