syzbot


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: 18d, last: 2d13h
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 -1 C 8 21h15m 14d 0/2 upstream: reported C repro on 2025/07/03 08:45
linux-6.1 WARNING in perf_pending_task origin:upstream -1 C 26 1d11h 20d 0/3 upstream: reported C repro on 2025/06/27 13:50
upstream WARNING in perf_pending_task perf -1 C 33835 now 23d 22/29 upstream: reported C repro on 2025/06/24 19:01

Sample crash report:
RBP: 00007f25c9883090 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000001 R14: 00007f25ca83afa0 R15: 00007fff1ee08d08
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4497 at kernel/events/core.c:6674 perf_sigtrap kernel/events/core.c:6674 [inline]
WARNING: CPU: 0 PID: 4497 at kernel/events/core.c:6674 perf_pending_task+0x358/0x470 kernel/events/core.c:6786
Modules linked in:
CPU: 0 PID: 4497 Comm: syz.0.27 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:perf_sigtrap kernel/events/core.c:6674 [inline]
RIP: 0010:perf_pending_task+0x358/0x470 kernel/events/core.c:6786
Code: ff 84 db 75 14 e8 28 8a dd ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 14 8a dd ff e8 97 41 66 ff eb e5 e8 08 8a dd ff <0f> 0b e9 f3 fe ff ff e8 fc 89 dd ff 48 c7 c7 40 2e 1a 8c 4c 89 f6
RSP: 0018:ffffc90004f1fd18 EFLAGS: 00010293
RAX: ffffffff819a3908 RBX: ffff88813fe42e18 RCX: ffff888021d73b80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffed10043ae8b3
R10: ffffed10043ae8b3 R11: 1ffff110043ae8b2 R12: ffff888021d73b80
R13: ffff888060659d58 R14: ffff88813fe42be8 R15: 1ffff11027fc857d
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555652fc7d0 CR3: 000000000be8e000 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+0x61e/0x20a0 kernel/exit.c:883
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 __do_sys_exit_group kernel/exit.c:1008 [inline]
 __se_sys_exit_group kernel/exit.c:1006 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1006
 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: 0033:0x7f25ca613929
Code: Unable to access opcode bytes at RIP 0x7f25ca6138ff.
RSP: 002b:00007f25c9882f48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f25ca672bc8 RCX: 00007f25ca613929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 000000000000000e R08: 00007f25c9880ce6 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000001 R14: 00007f25ca83afa0 R15: 00007fff1ee08d08
 </TASK>

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2025/07/15 10:22 linux-5.15.y 89950c454265 03fcfc4b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/13 02:55 linux-5.15.y 2f693b607545 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/12 13:09 linux-5.15.y 2f693b607545 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/09 23:27 linux-5.15.y 3dea0e7f549e f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/09 23:25 linux-5.15.y 3dea0e7f549e f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/09 13:29 linux-5.15.y 3dea0e7f549e f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/09 05:14 linux-5.15.y 3dea0e7f549e 4d9fdfa4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/09 05:09 linux-5.15.y 3dea0e7f549e 4d9fdfa4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/05 21:47 linux-5.15.y 3dea0e7f549e 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/07/04 21:37 linux-5.15.y 3dea0e7f549e d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf WARNING in perf_pending_task
2025/06/30 11:18 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
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.