syzbot


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: 174d, last: 10h42m
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 784 3h17m 180d 0/3 upstream: reported C repro on 2025/06/27 13:50
linux-5.15 WARNING in perf_pending_task origin:upstream -1 C 513 6h07m 178d 0/3 upstream: reported C repro on 2025/06/29 10:30
upstream WARNING in perf_pending_task perf -1 C 35773 158d 182d 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: 7048 at kernel/events/core.c:6806 perf_sigtrap kernel/events/core.c:6806 [inline]
WARNING: CPU: 0 PID: 7048 at kernel/events/core.c:6806 perf_pending_task+0x35c/0x470 kernel/events/core.c:6918
Modules linked in:
CPU: 0 PID: 7048 Comm: syz.0.575 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:6806 [inline]
RIP: 0010:perf_pending_task+0x35c/0x470 kernel/events/core.c:6918
Code: ff 84 db 75 14 e8 f4 46 d6 ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 e0 46 d6 ff e8 fb 51 51 ff eb e5 e8 d4 46 d6 ff <0f> 0b e9 f3 fe ff ff e8 c8 46 d6 ff 48 c7 c7 30 d2 dc 8c 4c 89 f6
RSP: 0018:ffffc90004ca7c60 EFLAGS: 00010293
RAX: ffffffff81af49ec RBX: ffff88807ae2f830 RCX: ffff88807a385a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8e4a212f R09: 1ffffffff1c94425
R10: dffffc0000000000 R11: fffffbfff1c94426 R12: ffff88807a385a00
R13: ffff8880277b9530 R14: ffff88807ae2f5f0 R15: 1ffff1100f5c5ebe
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c006ef9000 CR3: 000000000cb30000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 task_work_run+0x1ce/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x90b/0x23c0 kernel/exit.c:883
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f228f38f749
Code: Unable to access opcode bytes at 0x7f228f38f71f.
RSP: 002b:00007fff455e66d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f228f38f749
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff455e673c R08: 00000002455e67cf R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000022e
R13: 00000000000927c0 R14: 000000000001e5d8 R15: 00007fff455e6790
 </TASK>

Crashes (121):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2025/12/24 08:13 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/23 11:02 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/22 11:11 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/21 13:25 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/20 20:07 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/20 13:53 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/20 08:14 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/19 21:12 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/18 22:00 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/18 07:45 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/17 19:53 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/17 13:45 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/17 09:05 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/16 22:40 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/16 17:52 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/16 16:13 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/16 14:31 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/15 20:54 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/15 16:06 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/14 16:17 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/13 21:22 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/13 02:06 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/12 17:54 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/11 23:42 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/11 13:03 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/11 11:37 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/11 05:46 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/11 04:40 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/10 16:32 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/09 20:08 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/09 17:59 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/08 19:08 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/08 17:23 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/08 13:51 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/06 21:23 linux-6.6.y 4791134e4aeb d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/05 22:21 linux-6.6.y 4791134e4aeb d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/05 03:15 linux-6.6.y 4791134e4aeb d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/04 19:20 linux-6.6.y 4791134e4aeb d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/04 09:39 linux-6.6.y 4791134e4aeb d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/02 20:57 linux-6.6.y 4791134e4aeb d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/11/30 16:50 linux-6.6.y 1e89a1be4fe9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/11/30 12:55 linux-6.6.y 1e89a1be4fe9 d6526ea3 .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.