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: 84d, last: 2h22m
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 213 3h56m 90d 0/3 upstream: reported C repro on 2025/06/27 13:50
linux-5.15 WARNING in perf_pending_task origin:upstream -1 C 210 44m 88d 0/3 upstream: reported C repro on 2025/06/29 10:30
upstream WARNING in perf_pending_task perf -1 C 35773 68d 93d 29/29 fixed on 2025/09/04 16:57

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5980 at kernel/events/core.c:6806 perf_sigtrap kernel/events/core.c:6806 [inline]
WARNING: CPU: 0 PID: 5980 at kernel/events/core.c:6806 perf_pending_task+0x35c/0x470 kernel/events/core.c:6918
Modules linked in:
CPU: 0 PID: 5980 Comm: syz.0.29 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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 54 49 d6 ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 40 49 d6 ff e8 bb 4d 51 ff eb e5 e8 34 49 d6 ff <0f> 0b e9 f3 fe ff ff e8 28 49 d6 ff 48 c7 c7 30 d0 dc 8c 4c 89 f6
RSP: 0018:ffffc900034f7c60 EFLAGS: 00010293
RAX: ffffffff81af4e6c RBX: ffff88801c673b40 RCX: ffff888029b6da00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8e4a7fef R09: 1ffffffff1c94ffd
R10: dffffc0000000000 R11: fffffbfff1c94ffe R12: ffff888029b6da00
R13: ffff88802fc1a530 R14: ffff88801c673900 R15: 1ffff110038ce720
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc824fe7dac 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: 0033:0x7fc824d8eec9
Code: Unable to access opcode bytes at 0x7fc824d8ee9f.
RSP: 002b:00007ffca49b29c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc824d8eec9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffca49b2a2c R08: 00000002a49b2abf R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000000c
R13: 00000000000927c0 R14: 000000000001b5ba R15: 00007ffca49b2a80
 </TASK>

Crashes (39):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2025/09/24 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
2025/09/17 18:28 linux-6.6.y 60a9e718726f e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/17 18:26 linux-6.6.y 60a9e718726f e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/17 18:05 linux-6.6.y 60a9e718726f e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/11 10:36 linux-6.6.y fe9731e10004 fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/11 05:42 linux-6.6.y fe9731e10004 fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/09 09:10 linux-6.6.y 355bd0b51d2f d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/09 07:11 linux-6.6.y 355bd0b51d2f d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/06 22:56 linux-6.6.y 355bd0b51d2f d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/03 05:46 linux-6.6.y cc1a1c5b404a 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/03 05:33 linux-6.6.y cc1a1c5b404a 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/09/02 10:33 linux-6.6.y cc1a1c5b404a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/08/29 12:19 linux-6.6.y cc1a1c5b404a 3e1beec6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/08/23 23:08 linux-6.6.y bb9c90ab9c5a bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/08/23 22:53 linux-6.6.y bb9c90ab9c5a bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/08/22 19:45 linux-6.6.y bb9c90ab9c5a bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/08/19 15:33 linux-6.6.y bb9c90ab9c5a 254a27c1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/08/18 14:23 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/08/14 05:08 linux-6.6.y 3a8ababb8b6a 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/08/08 00:57 linux-6.6.y 3a8ababb8b6a 04cffc22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/18 02:26 linux-6.6.y d96eb99e2f0e 88248e14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/17 02:20 linux-6.6.y 9247f4e6573a 44f8051e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/16 11:42 linux-6.6.y 9247f4e6573a 124ec9cc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/10 06:57 linux-6.6.y a5df3a702b2c 956bd956 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/09 04:47 linux-6.6.y a5df3a702b2c 4d9fdfa4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/07/06 18:37 linux-6.6.y a5df3a702b2c 4f67c4ae .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.