WARNING in trace_check_vprintf

Status: upstream: reported on 2026/08/13 09:23
Reported-by: syzbot+476b41285fea3bdd428e@syzkaller.appspotmail.com
First crash: 10d, last: 3d18h
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in trace_check_vprintf -1 3 11d 26d 0/3 upstream: reported on 2026/07/27 19:43

Sample crash report:
           <...>-1852797544 [000] dNZ36   179.039934: Unknown type 29513
       syz.5.540-6449    [000] .....   179.039934: dwc3_ctrl_req: Get SSP Isochronous Endpoint Companion Descriptor(Index = 0, Length = 0)
WARNING: CPU: 1 PID: 12119 at kernel/trace/trace.c:3867 trace_check_vprintf+0xd4a/0x1080 kernel/trace/trace.c:3865
Modules linked in:
CPU: 0 PID: 12119 Comm: syz.5.2161 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:trace_check_vprintf+0xd4a/0x1080 kernel/trace/trace.c:3865
Code: e8 2b 47 fc ff c6 05 6d a8 fa 0b 01 48 8b 7c 24 40 e8 5a 04 00 00 48 c7 c7 80 3e 2f 8a 48 8b 74 24 60 48 89 c2 e8 46 f3 38 08 <0f> 0b e9 1c fe ff ff 48 8b 4c 24 38 80 e1 07 38 c1 0f 8c ca f7 ff
RSP: 0018:ffffc9000394fa20 EFLAGS: 00010246
RAX: b4d621b6e605cd00 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001563f000 RSI: 000000000000c259 RDI: 000000000000c25a
RBP: ffff8880740300d8 R08: ffff8880b912795b R09: 1ffff11017224f2b
R10: dffffc0000000000 R11: ffffed1017224f2c R12: ffffffff8a200540
R13: ffffc9000394fb60 R14: dffffc0000000000 R15: 0000000000000002
FS:  00007f9d2e1b66c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32923ffc CR3: 000000004aab6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 trace_event_printf+0xea/0x140 kernel/trace/trace_output.c:320
 trace_raw_output_initcall_level+0x93/0xd0 include/trace/events/initcall.h:10
 tracing_read_pipe+0x52f/0xae0 kernel/trace/trace.c:6862
 vfs_read+0x2ff/0xd50 fs/read_write.c:483
 ksys_read+0x153/0x260 fs/read_write.c:623
 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: 0033:0x7f9d2ff5e0d9
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:00007f9d2e1b6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f9d301e5fa0 RCX: 00007f9d2ff5e0d9
RDX: 0000000000004000 RSI: 0000200000004580 RDI: 0000000000000004
RBP: 00007f9d2fff5024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9d301e6038 R14: 00007f9d301e5fa0 R15: 00007ffe92e66598
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/19 22:23 linux-5.15.y 0eb903b5b519 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/08/13 09:27 linux-5.15.y aabd761612db 359b2492 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/08/13 09:23 linux-5.15.y aabd761612db 359b2492 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
* Struck through repros no longer work on HEAD.