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: 435d, last: 5h31m
▶ ▼ 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 syz, C inconclusive 2813 33m 441d 0/3 upstream: reported C repro on 2025/06/27 13:50
linux-5.15 WARNING in perf_pending_task origin:upstream -1 syz, C 2287 17m 439d 0/3 upstream: reported C repro on 2025/06/29 10:30
upstream WARNING in perf_pending_task perf -1 syz, C 35773 419d 443d 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: 1 PID: 6913 at kernel/events/core.c:6808 perf_sigtrap kernel/events/core.c:6808 [inline]
WARNING: CPU: 1 PID: 6913 at kernel/events/core.c:6808 perf_pending_task+0x357/0x480 kernel/events/core.c:6920
Modules linked in:
CPU: 1 PID: 6913 Comm: syz.0.344 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:6808 [inline]
RIP: 0010:perf_pending_task+0x357/0x480 kernel/events/core.c:6920
Code: e8 9e cf d5 ff 84 db 75 10 e8 05 cd d5 ff 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 f5 cc d5 ff e8 b0 e7 4e ff eb e9 e8 e9 cc d5 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:ffffc9000c65fc48 EFLAGS: 00010293
RAX: ffffffff81b1b587 RBX: ffff888024dd65e8 RCX: ffff88801eeada00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888024dd63a8 R08: ffffffff8e8c8daf R09: 1ffffffff1d191b5
R10: dffffc0000000000 R11: fffffbfff1d191b6 R12: ffff88801eeada00
R13: ffff888078964130 R14: 0000000000000000 R15: 1ffff110049bac75
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faba1359270 CR3: 000000002df12000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x986/0x2530 kernel/exit.c:890
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1032
 __do_sys_exit_group kernel/exit.c:1043 [inline]
 __se_sys_exit_group kernel/exit.c:1041 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1041
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7faba139e159
Code: Unable to access opcode bytes at 0x7faba139e12f.
RSP: 002b:00007ffe120606d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faba139e159
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe1206073c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000147
R13: 00000000000927c0 R14: 000000000001ff2b R15: 00007ffe12060790
 </TASK>

Crashes (714):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/06 08:52 linux-6.6.y 8b73de7da85f 4f7b22a0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/09 22:44 linux-6.6.y d27334b2888c 5d63f80b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/27 08:38 linux-6.6.y 0a40c6fbd105 2b01f00e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/27 03:09 linux-6.6.y 0a40c6fbd105 2b01f00e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/05/04 18:44 linux-6.6.y 258cf62a6dfd 85f1bcf2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/01/16 14:41 linux-6.6.y c596736dadab d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2025/12/21 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
2026/09/11 08:55 linux-6.6.y 8b73de7da85f 1fe56c0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/10 15:21 linux-6.6.y 8b73de7da85f 1fe56c0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/09 19:38 linux-6.6.y 8b73de7da85f 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/09 14:39 linux-6.6.y 8b73de7da85f 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/09 02:52 linux-6.6.y 8b73de7da85f 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/07 03:48 linux-6.6.y 8b73de7da85f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/05 09:52 linux-6.6.y 8b73de7da85f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/04 23:46 linux-6.6.y 8b73de7da85f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/04 16:36 linux-6.6.y 8b73de7da85f f65209a4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/04 08:26 linux-6.6.y 8b73de7da85f 801f0966 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/04 03:49 linux-6.6.y 8b73de7da85f 801f0966 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/02 11:18 linux-6.6.y a4a971135a2f 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/02 03:24 linux-6.6.y a4a971135a2f 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/01 09:49 linux-6.6.y a4a971135a2f 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/09/01 03:52 linux-6.6.y a4a971135a2f 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/31 14:35 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/31 09:19 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/31 07:59 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/31 03:26 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/30 12:31 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/30 09:35 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/30 07:17 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/30 05:21 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/29 04:26 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/29 01:05 linux-6.6.y a4a971135a2f 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/27 01:13 linux-6.6.y dc6160265ffc a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/26 20:59 linux-6.6.y dc6160265ffc a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/25 00:38 linux-6.6.y dc6160265ffc 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/24 13:59 linux-6.6.y dc6160265ffc b55bd4c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/22 13:10 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/22 11:01 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/22 05:48 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/21 23:44 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/21 17:29 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/21 13:41 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/21 11:16 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/21 05:33 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/21 04:21 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/20 14:39 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/20 10:41 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/19 12:14 linux-6.6.y d27334b2888c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/19 09:53 linux-6.6.y d27334b2888c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/19 09:35 linux-6.6.y d27334b2888c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/18 21:50 linux-6.6.y d27334b2888c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/18 19:32 linux-6.6.y d27334b2888c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/18 16:05 linux-6.6.y d27334b2888c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/17 07:20 linux-6.6.y d27334b2888c 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in perf_pending_task
2026/08/17 05:51 linux-6.6.y d27334b2888c 746171ee .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.