WARNING in __trace_find_cmdline

Status: upstream: reported on 2026/08/25 06:06
Reported-by: syzbot+ecf78aa88c3f2d33925a@syzkaller.appspotmail.com
First crash: 63d, last: 8h09m

Sample crash report:
afs: Unknown parameter 'flocRª³«…K›autocell'
------------[ cut here ]------------
WARNING: CPU: 0 PID: 12721 at kernel/trace/trace.c:2465 __trace_find_cmdline+0x154/0x1b0 kernel/trace/trace.c:2465
Modules linked in:
CPU: 0 PID: 12721 Comm: syz.7.1659 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:__trace_find_cmdline+0x154/0x1b0 kernel/trace/trace.c:2465
Code: 3c 24 ba 06 00 00 00 4c 89 ff 48 c7 c6 a0 93 b0 8a e8 80 e0 4d 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 2c 82 fc ff <0f> 0b ba 06 00 00 00 4c 89 ff 48 c7 c6 80 93 b0 8a eb d4 44 89 f1
RSP: 0018:ffffc900034c7a20 EFLAGS: 00010287
RAX: ffffffff8185c454 RBX: ffff888077a10000 RCX: 0000000000080000
RDX: ffffc9001ef99000 RSI: 0000000000007fec RDI: 0000000000007fed
RBP: 000000009e000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000698f54 R12: 1ffff92000698f50
R13: dffffc0000000000 R14: 000000009e000000 R15: ffffc900034c7b60
FS:  00007f87129f66c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000035f030 CR3: 000000001e75d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 trace_find_cmdline+0xf1/0x1c0 kernel/trace/trace.c:2487
 trace_print_context+0xf9/0x4d0 kernel/trace/trace_output.c:612
 print_trace_fmt+0x3f2/0x7b0 kernel/trace/trace.c:4394
 tracing_read_pipe+0x53b/0xb10 kernel/trace/trace.c:6896
 vfs_read+0x2db/0x960 fs/read_write.c:468
 ksys_read+0x14d/0x260 fs/read_write.c:613
 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: 0033:0x7f871479f559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f87129f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f8714a26090 RCX: 00007f871479f559
RDX: 0000000000004000 RSI: 0000200000000740 RDI: 0000000000000004
RBP: 00007f8714836b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8714a26128 R14: 00007f8714a26090 R15: 00007ffd7f140c48
 </TASK>

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/27 21:08 linux-6.1.y 79807e970724 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __trace_find_cmdline
2026/10/11 13:16 linux-6.1.y a500ba24937a 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __trace_find_cmdline
2026/10/04 15:21 linux-6.1.y a500ba24937a 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __trace_find_cmdline
2026/09/05 00:12 linux-6.1.y cf82dcca9634 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __trace_find_cmdline
2026/09/05 00:12 linux-6.1.y cf82dcca9634 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __trace_find_cmdline
2026/08/31 17:41 linux-6.1.y d64a499eea6b 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __trace_find_cmdline
2026/08/25 06:06 linux-6.1.y 05208478041c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __trace_find_cmdline
* Struck through repros no longer work on HEAD.