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WARNING in perf_pending_task

Status: upstream: reported C repro on 2025/06/27 13:50
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+4281a7c76d4ee0c96c3c@syzkaller.appspotmail.com
First crash: 337d, last: 2h44m
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2025/08/18 linux-6.1.y (ToT) 0bc96de781b4 C [report] WARNING in perf_pending_task
2025/07/02 upstream (ToT) 66701750d556 C [report] WARNING in perf_pending_task
2025/08/18 upstream (ToT) c17b750b3ad9 C Didn't crash
▶ ▼ 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 492 2h04m 331d 0/2 upstream: reported C repro on 2025/07/03 08:45
linux-5.15 WARNING in perf_pending_task origin:upstream -1 C 1617 5h15m 335d 0/3 upstream: reported C repro on 2025/06/29 10:30
upstream WARNING in perf_pending_task perf -1 C 35773 315d 340d 29/29 fixed on 2025/09/04 16:57
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/09/02 06:16 4h07m fix candidate upstream OK (0) job log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4596 at kernel/events/core.c:6592 perf_sigtrap kernel/events/core.c:6592 [inline]
WARNING: CPU: 1 PID: 4596 at kernel/events/core.c:6592 perf_pending_task+0x358/0x470 kernel/events/core.c:6704
Modules linked in:
CPU: 1 PID: 4596 Comm: syz.0.92 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:6592 [inline]
RIP: 0010:perf_pending_task+0x358/0x470 kernel/events/core.c:6704
Code: ff 84 db 75 14 e8 e8 76 da ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 d4 76 da ff e8 d7 73 58 ff eb e5 e8 c8 76 da ff <0f> 0b e9 f3 fe ff ff e8 bc 76 da ff 48 c7 c7 10 35 bc 8c 4c 89 f6
RSP: 0018:ffffc90003987c40 EFLAGS: 00010293
RAX: ffffffff81a80fe8 RBX: ffff888028a58458 RCX: ffff888075dd9dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff888075dda7c3 R09: 1ffff1100ebbb4f8
R10: dffffc0000000000 R11: ffffed100ebbb4f9 R12: ffff888075dd9dc0
R13: ffff88802aa5b960 R14: ffff888028a58220 R15: 1ffff1100514b044
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa377757f70 CR3: 000000000c88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 task_work_run+0x1d0/0x260 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x982/0x2480 kernel/exit.c:881
 do_group_exit+0x217/0x2d0 kernel/exit.c:1023
 __do_sys_exit_group kernel/exit.c:1034 [inline]
 __se_sys_exit_group kernel/exit.c:1032 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1032
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa37779ce59
Code: Unable to access opcode bytes at 0x7fa37779ce2f.
RSP: 002b:00007ffd71cd9118 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa37779ce59
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd71cd917c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000004b
R13: 00000000000927c0 R14: 000000000001894c R15: 00007ffd71cd91d0
 </TASK>

Crashes (1704):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/27 07:58 linux-6.1.y dcbcab9d7079 2b01f00e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/27 03:07 linux-6.1.y dcbcab9d7079 2b01f00e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/01/16 13:04 linux-6.1.y bec0e10ee67e d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/12/21 00:57 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/12/18 02:26 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/11/28 00:28 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/11/27 20:29 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/11/14 16:17 linux-6.1.y f6e38ae624cf f7988ea4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/10/30 14:34 linux-6.1.y f6e38ae624cf fd2207e7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/09/10 14:32 linux-6.1.y f97f1002271b fdeaa69b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/09/09 16:24 linux-6.1.y 28c695c365e1 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/09/09 15:23 linux-6.1.y 28c695c365e1 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/09/09 14:09 linux-6.1.y 28c695c365e1 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/09/07 14:43 linux-6.1.y 28c695c365e1 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/08/29 08:11 linux-6.1.y f89b6e15694c d401b9d7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/08/27 12:35 linux-6.1.y 0bc96de781b4 e12e5ba4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/08/27 11:26 linux-6.1.y 0bc96de781b4 e12e5ba4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/08/09 00:15 linux-6.1.y 3594f306da12 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/08/03 22:41 linux-6.1.y 3594f306da12 7368264b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/07/13 08:08 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/06/29 21:31 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/08/05 02:49 linux-6.1.y 3594f306da12 f5bcc8dc .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/30 17:22 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/30 15:58 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/30 13:31 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/30 12:06 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/30 09:58 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/30 08:55 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/30 04:08 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/30 00:48 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/29 21:35 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/29 18:43 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/29 17:42 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/29 13:08 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/29 09:58 linux-6.1.y dcbcab9d7079 4624854e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/29 07:38 linux-6.1.y dcbcab9d7079 4624854e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/29 03:57 linux-6.1.y dcbcab9d7079 4624854e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/29 01:24 linux-6.1.y dcbcab9d7079 4624854e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/29 00:08 linux-6.1.y dcbcab9d7079 4624854e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/28 12:35 linux-6.1.y dcbcab9d7079 681715f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/28 08:48 linux-6.1.y dcbcab9d7079 4c36e7e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/28 03:21 linux-6.1.y dcbcab9d7079 4c36e7e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/27 21:54 linux-6.1.y dcbcab9d7079 8777bdc3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/27 20:33 linux-6.1.y dcbcab9d7079 8777bdc3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/27 17:35 linux-6.1.y dcbcab9d7079 8777bdc3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/27 14:16 linux-6.1.y dcbcab9d7079 8777bdc3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/26 15:45 linux-6.1.y dcbcab9d7079 a3e47276 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/26 06:22 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 23:49 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 20:31 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 19:29 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 13:22 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 11:32 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 10:12 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 09:10 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 07:16 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 04:46 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 02:58 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/25 00:23 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/24 21:36 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/24 20:53 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/24 18:24 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/24 14:22 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2026/05/24 12:33 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
2025/06/27 13:49 linux-6.1.y 7e69c33e4858 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in perf_pending_task
* Struck through repros no longer work on HEAD.