WARNING in trace_check_vprintf

Status: upstream: reported on 2026/08/13 09:23
Reported-by: syzbot+476b41285fea3bdd428e@syzkaller.appspotmail.com
First crash: 63d, last: 4h54m
▶ ▼ 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 11 20h02m 80d 0/3 upstream: reported on 2026/07/27 19:43

Sample crash report:
------------[ cut here ]------------
fmt: 'level=%s
' current_buffer: '           <...>-4442    [001] .....    80.628770: dwc3_ctrl_req: Get Device Status(Length = 0)
           <...>-1970561396 [001] .p.35    80.684063: Unknown type 25955
          <idle>-0       [001] .....    80.709295: initcall_level: level='
WARNING: CPU: 1 PID: 12068 at kernel/trace/trace.c:3867 trace_check_vprintf+0xd4a/0x1080 kernel/trace/trace.c:3865
Modules linked in:
CPU: 1 PID: 12068 Comm: syz.2.2257 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:trace_check_vprintf+0xd4a/0x1080 kernel/trace/trace.c:3865
Code: e8 3b 41 fc ff c6 05 37 8b da 0c 01 48 8b 7c 24 40 e8 5a 04 00 00 48 c7 c7 a0 3e 2f 8a 48 8b 74 24 60 48 89 c2 e8 86 47 3a 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:ffffc900030cfa20 EFLAGS: 00010246
RAX: a766dbac35699e00 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90004f99000 RSI: 000000000000a290 RDI: 000000000000a291
RBP: ffff8880264540d8 R08: ffffc900030cf547 R09: 1ffff92000619ea8
R10: dffffc0000000000 R11: fffff52000619ea9 R12: ffffffff8a200540
R13: ffffc900030cfb60 R14: dffffc0000000000 R15: 0000000000000002
FS:  00007f899d0d76c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6946b63158 CR3: 000000001f1c7000 CR4: 00000000003506f0
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:6872
 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: 0033:0x7f899ee7f559
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:00007f899d0d7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f899f106fa0 RCX: 00007f899ee7f559
RDX: 0000000000004000 RSI: 00002000000091c0 RDI: 0000000000000006
RBP: 00007f899ef168b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f899f107038 R14: 00007f899f106fa0 R15: 00007fff86e0aad8
 </TASK>

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/16 01:27 linux-5.15.y 792fbe1537d8 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/10/15 10:15 linux-5.15.y a051a4bf909f 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/10/15 10:15 linux-5.15.y a051a4bf909f 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/10/14 03:59 linux-5.15.y a051a4bf909f 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/10/07 20:19 linux-5.15.y a051a4bf909f 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/10/07 20:18 linux-5.15.y a051a4bf909f 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/10/03 07:42 linux-5.15.y 0248c33e835e 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/09/29 12:03 linux-5.15.y 0248c33e835e 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/09/28 04:20 linux-5.15.y 0248c33e835e a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/09/28 04:18 linux-5.15.y 0248c33e835e a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/09/19 11:41 linux-5.15.y 0248c33e835e 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/09/10 15:23 linux-5.15.y 0996e0926f6b 1fe56c0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/09/04 01:50 linux-5.15.y 0996e0926f6b 801f0966 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/09/01 12:06 linux-5.15.y 28c35638ec51 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
2026/08/31 17:26 linux-5.15.y 28c35638ec51 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in trace_check_vprintf
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.