linux-kernel - [syzbot] [trace?] WARNING in tracing_start

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Message-ID: <680049ca.050a0220.5cdb3.000a.GAE@google.com>
Date: Wed, 16 Apr 2025 17:22:34 -0700
From: syzbot <syzbot+ccdec3bfe0beec58a38d@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	mathieu.desnoyers@...icios.com, mhiramat@...nel.org, rostedt@...dmis.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [trace?] WARNING in tracing_start_tr

Hello,

syzbot found the following issue on:

HEAD commit:    3bde70a2c827 Merge tag 'v6.15-rc1-smb3-client-fixes' of gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1240cdac580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7a4e108575159039
dashboard link: https://syzkaller.appspot.com/bug?extid=ccdec3bfe0beec58a38d
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/385544917b90/disk-3bde70a2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8e29d15e8394/vmlinux-3bde70a2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2dbcc4712371/bzImage-3bde70a2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ccdec3bfe0beec58a38d@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6325 at kernel/trace/trace.c:2431 tracing_start_tr.part.0+0x1fc/0x2a0 kernel/trace/trace.c:2431
Modules linked in:
CPU: 0 UID: 0 PID: 6325 Comm: syz.2.94 Not tainted 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:tracing_start_tr.part.0+0x1fc/0x2a0 kernel/trace/trace.c:2431
Code: 00 0f 85 97 00 00 00 48 83 3d 7f 52 62 0c 00 74 78 e8 28 55 fb ff 4c 89 ff e8 80 dd b2 09 90 e9 d9 fe ff ff e8 15 55 fb ff 90 <0f> 0b 90 c7 83 94 00 00 00 00 00 00 00 e9 c1 fe ff ff e8 ad c2 5f
RSP: 0018:ffffc9000f3e7b40 EFLAGS: 00010087
RAX: 000000000001dd6a RBX: ffffffff8e445400 RCX: ffffc9000e2a2000
RDX: 0000000000080000 RSI: ffffffff81bfe7ab RDI: 0000000000000005
RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000000 R12: 1ffff92001e7cf69
R13: 0000000000000283 R14: ffffffff8e4454e0 R15: ffffffff8e445420
FS:  00007f889698f6c0(0000) GS:ffff8881249b9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c430541 CR3: 0000000034dba000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tracing_start_tr kernel/trace/trace.c:9410 [inline]
 buffer_subbuf_size_write+0x226/0x280 kernel/trace/trace.c:9408
 do_loop_readv_writev fs/read_write.c:848 [inline]
 do_loop_readv_writev fs/read_write.c:833 [inline]
 vfs_writev+0x6c4/0xdc0 fs/read_write.c:1057
 do_writev+0x132/0x330 fs/read_write.c:1101
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8895b8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f889698f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f8895da6160 RCX: 00007f8895b8d169
RDX: 0000000000000008 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007f8895c0e990 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8895da6160 R15: 00007ffd37f16b28
 </TASK>


---
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