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: 437d, last: 10h30m
▶ ▼ 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 712 9h04m 433d 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 2806 8h12m 439d 0/3 upstream: reported C repro on 2025/06/27 13:50
upstream WARNING in perf_pending_task perf -1 syz, C 35773 417d 442d 29/29 fixed on 2025/09/04 16:57

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4538 at kernel/events/core.c:6698 perf_sigtrap kernel/events/core.c:6698 [inline]
WARNING: CPU: 0 PID: 4538 at kernel/events/core.c:6698 perf_pending_task+0x353/0x480 kernel/events/core.c:6810
Modules linked in:
CPU: 0 PID: 4538 Comm: syz.0.92 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:perf_sigtrap kernel/events/core.c:6698 [inline]
RIP: 0010:perf_pending_task+0x353/0x480 kernel/events/core.c:6810
Code: e8 32 41 de ff 84 db 75 10 e8 c9 3e de ff 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 b9 3e de ff e8 3c ac 65 ff eb e9 e8 ad 3e de ff <0f> 0b 49 bd 00 00 00 00 00 fc ff df 43 80 3c 2f 00 0f 85 0a ff ff
RSP: 0018:ffffc90004e5fd00 EFLAGS: 00010293
RAX: ffffffff819ad0f3 RBX: ffff8880597ba228 RCX: ffff888029029dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8880597b9ff8 R08: ffff88802902a7d3 R09: 1ffff110052054fa
R10: dffffc0000000000 R11: ffffed10052054fb R12: ffff888029029dc0
R13: ffff8880798ca158 R14: 0000000000000000 R15: 1ffff1100b2f73ff
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa23830dac CR3: 000000001afb2000 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+0x635/0x2110 kernel/exit.c:890
 do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
 __do_sys_exit_group kernel/exit.c:1015 [inline]
 __se_sys_exit_group kernel/exit.c:1013 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1013
 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: 0033:0x7faa235a7159
Code: Unable to access opcode bytes at RIP 0x7faa235a712f.
RSP: 002b:00007fff4113b6e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faa235a7159
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff4113b74c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000004b
R13: 00000000000927c0 R14: 00000000000139ee R15: 00007fff4113b7a0
 </TASK>

Crashes (2283):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/06 11:59 linux-5.15.y 0996e0926f6b 4f7b22a0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/09 21:13 linux-5.15.y aabd761612db 5d63f80b .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 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
2026/09/09 18:21 linux-5.15.y 0996e0926f6b 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/09 05:57 linux-5.15.y 0996e0926f6b 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/09 05:04 linux-5.15.y 0996e0926f6b 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/08 18:03 linux-5.15.y 0996e0926f6b 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/08 16:11 linux-5.15.y 0996e0926f6b 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/08 11:40 linux-5.15.y 0996e0926f6b 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/08 07:31 linux-5.15.y 0996e0926f6b 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/06 19:27 linux-5.15.y 0996e0926f6b 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/06 18:14 linux-5.15.y 0996e0926f6b 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/05 11:19 linux-5.15.y 0996e0926f6b 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/05 03:39 linux-5.15.y 0996e0926f6b 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/04 21:34 linux-5.15.y 0996e0926f6b f65209a4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/04 01:49 linux-5.15.y 0996e0926f6b 801f0966 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/03 23:55 linux-5.15.y 0996e0926f6b 801f0966 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/03 05:54 linux-5.15.y 0996e0926f6b 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/03 04:33 linux-5.15.y 0996e0926f6b 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/03 00:09 linux-5.15.y 0996e0926f6b 85995287 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/02 19:03 linux-5.15.y 0996e0926f6b 85995287 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/01 23:09 linux-5.15.y 28c35638ec51 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/01 06:34 linux-5.15.y 28c35638ec51 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/09/01 03:41 linux-5.15.y 28c35638ec51 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/31 02:06 linux-5.15.y 28c35638ec51 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/28 23:04 linux-5.15.y 28c35638ec51 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/28 16:52 linux-5.15.y 28c35638ec51 e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/27 20:13 linux-5.15.y 4a1eaf96ee5c 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/27 17:30 linux-5.15.y 4a1eaf96ee5c 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/27 15:51 linux-5.15.y 4a1eaf96ee5c 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/27 08:20 linux-5.15.y 945fa863f02c a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/27 03:50 linux-5.15.y 945fa863f02c a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/26 10:23 linux-5.15.y 945fa863f02c 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/25 23:15 linux-5.15.y 945fa863f02c a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/25 18:08 linux-5.15.y 945fa863f02c a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/25 14:14 linux-5.15.y 945fa863f02c a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/25 08:29 linux-5.15.y 945fa863f02c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/25 04:39 linux-5.15.y 945fa863f02c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/24 09:02 linux-5.15.y 945fa863f02c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/24 04:47 linux-5.15.y 945fa863f02c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/23 21:27 linux-5.15.y 945fa863f02c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/23 18:19 linux-5.15.y 945fa863f02c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/23 03:56 linux-5.15.y 0eb903b5b519 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/23 00:23 linux-5.15.y 0eb903b5b519 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/22 14:44 linux-5.15.y 0eb903b5b519 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2026/08/21 16:32 linux-5.15.y 0eb903b5b519 1e72964b .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.