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: 400d, last: 17h24m
▶ ▼ 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 syz, C inconclusive 621 2h40m 396d 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 syz, C inconclusive 2378 2h01m 401d 0/3 upstream: reported C repro on 2025/06/27 13:50
upstream WARNING in perf_pending_task perf -1 syz, C 35773 380d 404d 29/29 fixed on 2025/09/04 16:57

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5002 at kernel/events/core.c:6688 perf_sigtrap kernel/events/core.c:6688 [inline]
WARNING: CPU: 0 PID: 5002 at kernel/events/core.c:6688 perf_pending_task+0x358/0x470 kernel/events/core.c:6800
Modules linked in:
CPU: 0 PID: 5002 Comm: syz.4.323 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:6688 [inline]
RIP: 0010:perf_pending_task+0x358/0x470 kernel/events/core.c:6800
Code: ff 84 db 75 14 e8 48 48 de ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 34 48 de ff e8 57 8f 65 ff eb e5 e8 28 48 de ff <0f> 0b e9 f3 fe ff ff e8 1c 48 de ff 48 c7 c7 20 4c 3a 8c 4c 89 f6
RSP: 0018:ffffc9000517fd18 EFLAGS: 00010293
RAX: ffffffff819aede8 RBX: ffff88805c199638 RCX: ffff888057d1bb80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff888057d1c593 R09: 1ffff1100afa38b2
R10: dffffc0000000000 R11: ffffed100afa38b3 R12: ffff888057d1bb80
R13: ffff88805c098958 R14: ffff88805c199408 R15: 1ffff1100b833281
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f923d9f0a08 CR3: 000000000c08e000 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+0x626/0x20c0 kernel/exit.c:884
 do_group_exit+0x12e/0x300 kernel/exit.c:998
 __do_sys_exit_group kernel/exit.c:1009 [inline]
 __se_sys_exit_group kernel/exit.c:1007 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1007
 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: 0033:0x7fcf16513e59
Code: Unable to access opcode bytes at RIP 0x7fcf16513e2f.
RSP: 002b:00007fff4bbe0ec8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcf16513e59
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff4bbe0f2c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000026
R13: 00000000000927c0 R14: 0000000000018584 R15: 00007fff4bbe0f80
 </TASK>

Crashes (2111):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/27 07:54 linux-5.15.y 241d66fa280c 2b01f00e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/05/27 03:07 linux-5.15.y 241d66fa280c 2b01f00e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/05/04 19:24 linux-5.15.y ef251c45f1cd 85f1bcf2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
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
2026/08/02 17:20 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/02 15:00 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/01 15:38 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/01 12:48 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/01 10:04 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/01 03:28 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/01 02:11 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/31 23:07 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/31 19:35 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/31 17:37 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/31 14:10 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/31 12:04 linux-5.15.y 6e2fd6534337 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/31 08:55 linux-5.15.y 6e2fd6534337 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/31 07:17 linux-5.15.y 6e2fd6534337 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/31 03:44 linux-5.15.y 6e2fd6534337 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/30 23:43 linux-5.15.y 6e2fd6534337 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/30 20:21 linux-5.15.y 6e2fd6534337 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/30 11:21 linux-5.15.y 674f684f7c61 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/30 10:08 linux-5.15.y 674f684f7c61 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/30 05:14 linux-5.15.y 674f684f7c61 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/29 22:34 linux-5.15.y 674f684f7c61 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/29 22:30 linux-5.15.y 674f684f7c61 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/29 20:23 linux-5.15.y 674f684f7c61 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/29 07:50 linux-5.15.y 674f684f7c61 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/28 12:33 linux-5.15.y 674f684f7c61 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/28 04:01 linux-5.15.y 674f684f7c61 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/28 02:49 linux-5.15.y 674f684f7c61 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/28 00:48 linux-5.15.y 674f684f7c61 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/27 20:59 linux-5.15.y 674f684f7c61 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/27 19:43 linux-5.15.y 674f684f7c61 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/27 13:54 linux-5.15.y 674f684f7c61 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/27 13:50 linux-5.15.y 674f684f7c61 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/26 23:56 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/26 22:16 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/26 20:23 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/26 17:25 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/26 12:05 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/26 10:12 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/26 08:53 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/26 07:52 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/26 06:15 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/25 21:10 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/25 18:59 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/25 14:57 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/25 13:59 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/25 12:58 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/25 09:23 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/07/25 02:27 linux-5.15.y 674f684f7c61 492bab15 .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.