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WARNING in perf_pending_task

Status: upstream: reported C repro on 2025/06/29 10:30
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+5033aaab8eff7ec95477@syzkaller.appspotmail.com
First crash: 274d, last: 9h29m
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2025/07/06 upstream (ToT) 1f988d0788f5 C [report] WARNING in perf_pending_task
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in perf_pending_task origin:upstream missing-backport -1 C inconclusive 330 11h44m 270d 0/2 upstream: reported C repro on 2025/07/03 08:45
linux-6.1 WARNING in perf_pending_task origin:upstream missing-backport -1 C inconclusive 1285 3h37m 276d 0/3 upstream: reported C repro on 2025/06/27 13:50
upstream WARNING in perf_pending_task perf -1 C 35773 254d 279d 29/29 fixed on 2025/09/04 16:57

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5190 at kernel/events/core.c:6688 perf_sigtrap kernel/events/core.c:6688 [inline]
WARNING: CPU: 0 PID: 5190 at kernel/events/core.c:6688 perf_pending_task+0x358/0x470 kernel/events/core.c:6800
Modules linked in:
CPU: 0 PID: 5190 Comm: syz.0.294 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:perf_sigtrap kernel/events/core.c:6688 [inline]
RIP: 0010:perf_pending_task+0x358/0x470 kernel/events/core.c:6800
Code: ff 84 db 75 14 e8 e8 9f de ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 d4 9f de ff e8 b7 4e 67 ff eb e5 e8 c8 9f de ff <0f> 0b e9 f3 fe ff ff e8 bc 9f de ff 48 c7 c7 c0 20 1a 8c 4c 89 f6
RSP: 0018:ffffc900050b79d8 EFLAGS: 00010293
RAX: ffffffff81992c48 RBX: ffff88807a872820 RCX: ffff888079f1d940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffed100f3e3c6b
R10: ffffed100f3e3c6b R11: 1ffff1100f3e3c6a R12: ffff888079f1d940
R13: ffff88802a2ea558 R14: ffff88807a8725f0 R15: 1ffff1100f50e4be
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555572b537d0 CR3: 000000000be8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x61e/0x20a0 kernel/exit.c:883
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 get_signal+0x6ca/0x12c0 kernel/signal.c:2900
 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 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: 0033:0x7f4f2c8b5749
Code: Unable to access opcode bytes at RIP 0x7f4f2c8b571f.
RSP: 002b:00007f4f2bf240e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f4f2cb0bfa8 RCX: 00007f4f2c8b5749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4f2cb0bfa8
RBP: 00007f4f2cb0bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4f2cb0c038 R14: 00007ffc74b0c6a0 R15: 00007ffc74b0c788
 </TASK>

Crashes (1053):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/16 13:06 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/12/21 02:36 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/12/18 02:35 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/11/28 00:34 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/11/27 22:58 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/11/14 16:19 linux-5.15.y cc5ec8769306 f7988ea4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/10/30 14:25 linux-5.15.y cc5ec8769306 fd2207e7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/09/10 16:14 linux-5.15.y de9476bb4f1b fdeaa69b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/09/09 09:18 linux-5.15.y 7a6c2d093c45 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/09/09 08:28 linux-5.15.y 7a6c2d093c45 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/09/09 07:16 linux-5.15.y 7a6c2d093c45 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/09/07 02:55 linux-5.15.y 7a6c2d093c45 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/08/24 07:53 linux-5.15.y c79648372d02 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/08/19 20:12 linux-5.15.y c79648372d02 254a27c1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/08/19 19:27 linux-5.15.y c79648372d02 254a27c1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/23 18:15 linux-5.15.y c79648372d02 e1dd4f22 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/04 22:11 linux-5.15.y 3dea0e7f549e d869b261 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/30 17:42 linux-5.15.y 91d48252ad4b dcaebc52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/30 15:36 linux-5.15.y 91d48252ad4b dcaebc52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/30 14:35 linux-5.15.y 91d48252ad4b dcaebc52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/30 11:19 linux-5.15.y 91d48252ad4b dcaebc52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/30 09:49 linux-5.15.y 91d48252ad4b dcaebc52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/30 00:35 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/29 21:49 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/29 20:36 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/29 18:21 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/29 05:40 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/29 00:20 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/28 16:23 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/28 10:43 linux-5.15.y 91d48252ad4b 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/28 08:35 linux-5.15.y 91d48252ad4b 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/28 02:30 linux-5.15.y 91d48252ad4b 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/27 14:59 linux-5.15.y 91d48252ad4b 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/27 13:48 linux-5.15.y 91d48252ad4b 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/26 00:52 linux-5.15.y 91d48252ad4b c6143aac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/25 23:16 linux-5.15.y 91d48252ad4b c6143aac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/25 22:12 linux-5.15.y 91d48252ad4b c6143aac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/25 20:17 linux-5.15.y 91d48252ad4b 8ee77f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/25 18:22 linux-5.15.y 91d48252ad4b 8ee77f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/25 17:05 linux-5.15.y 91d48252ad4b 8ee77f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/25 13:41 linux-5.15.y 91d48252ad4b 8ee77f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/24 23:27 linux-5.15.y 91d48252ad4b 74e70d19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/24 21:46 linux-5.15.y 91d48252ad4b 74e70d19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/24 17:46 linux-5.15.y 91d48252ad4b 74e70d19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/23 22:29 linux-5.15.y 91d48252ad4b 4933dba2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/23 17:00 linux-5.15.y 91d48252ad4b 4933dba2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/23 03:48 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/23 02:23 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/23 00:44 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/22 22:25 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/22 13:19 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/22 11:56 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/21 22:41 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/21 20:58 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/21 19:43 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/21 13:59 linux-5.15.y 91d48252ad4b 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/21 03:14 linux-5.15.y 91d48252ad4b ac6f1dff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/20 23:29 linux-5.15.y 91d48252ad4b ac6f1dff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/20 15:57 linux-5.15.y 91d48252ad4b ac6f1dff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/19 21:57 linux-5.15.y 91d48252ad4b bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/03/19 13:33 linux-5.15.y 91d48252ad4b bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/06/29 10:29 linux-5.15.y 3dea0e7f549e fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
* Struck through repros no longer work on HEAD.