WARNING in trace_check_vprintf

Status: upstream: reported on 2026/07/27 19:43
Reported-by: syzbot+ae301276c89ae21db82a@syzkaller.appspotmail.com
First crash: 20d, last: 5d05h
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in trace_check_vprintf -1 2 3d23h 3d23h 0/3 upstream: reported on 2026/08/13 09:23

Sample crash report:
       syz.2.853-6712    [001] .....   172.268313: tracing_mark_write: a
       syz.1.954-7008    [001] .....   184.118397: dwc3_ctrl_req: Get Device Status(Length = 0)
           <...>-1970561396 [001] .p.35   184.173690: Unknown type 25955
          <idle>-0       [001] .....   184.198921: initcall_level: level='
WARNING: CPU: 1 PID: 7450 at kernel/trace/trace.c:3891 trace_check_vprintf+0xd4a/0x1080 kernel/trace/trace.c:3889
Modules linked in:
CPU: 1 PID: 7450 Comm: syz.5.1144 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:3889
Code: e8 db 24 fc ff c6 05 2f 96 86 0c 01 48 8b 7c 24 40 e8 5a 04 00 00 48 c7 c7 60 82 90 8a 48 8b 74 24 60 48 89 c2 e8 06 af c7 ff <0f> 0b e9 1c fe ff ff 48 8b 4c 24 38 80 e1 07 38 c1 0f 8c ca f7 ff
RSP: 0018:ffffc9000db07a60 EFLAGS: 00010246
RAX: 72f810287b6ec600 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001d3c1000 RSI: 00000000000049e5 RDI: 00000000000049e6
RBP: ffff88807458c0d8 R08: ffff8880b8f279db R09: 1ffff110171e4f3b
R10: dffffc0000000000 R11: ffffed10171e4f3c R12: ffffffff8a800540
R13: ffffc9000db07ba0 R14: dffffc0000000000 R15: 0000000000000002
FS:  00007f9a700976c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30e1fff8 CR3: 00000000760a9000 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:321
 trace_raw_output_initcall_level+0x93/0xd0 include/trace/events/initcall.h:10
 tracing_read_pipe+0x53b/0xb10 kernel/trace/trace.c:6886
 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: 0033:0x7f9a6f19e0d9
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:00007f9a70097028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f9a6f425fa0 RCX: 00007f9a6f19e0d9
RDX: 00000000000019d7 RSI: 0000200000001100 RDI: 0000000000000003
RBP: 00007f9a6f235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9a6f426038 R14: 00007f9a6f425fa0 R15: 00007ffd39a68ca8
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/12 02:59 linux-6.1.y e4f7d8be268e f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in trace_check_vprintf
2026/08/07 06:42 linux-6.1.y 03f3a99e8e93 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in trace_check_vprintf
2026/07/27 19:43 linux-6.1.y dc5c83b7f5f8 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in trace_check_vprintf
* Struck through repros no longer work on HEAD.