linux-kernel - Re: [syzbot] [block?] [trace?] WARNING in __blk_add

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Message-ID: <c4ea8d7c-e449-47d6-b4a1-54fdbe86ba01@kernel.dk>
Date: Sat, 25 Oct 2025 07:35:16 -0600
From: Jens Axboe <axboe@...nel.dk>
To: syzbot <syzbot+153e64c0aa875d7e4c37@...kaller.appspotmail.com>,
 linux-block@...r.kernel.org, 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,
 Johannes Thumshirn <Johannes.Thumshirn@....com>
Subject: Re: [syzbot] [block?] [trace?] WARNING in __blk_add_trace

On 10/24/25 5:11 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    72fb0170ef1f Add linux-next specific files for 20251024
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1640f734580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f02d98016cc9c137
> dashboard link: https://syzkaller.appspot.com/bug?extid=153e64c0aa875d7e4c37
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=105853e2580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12722614580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/f63074a739fa/disk-72fb0170.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/b15d7b8b9621/vmlinux-72fb0170.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/449963b71f60/bzImage-72fb0170.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+153e64c0aa875d7e4c37@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> WARNING: kernel/trace/blktrace.c:368 at __blk_add_trace+0x79c/0x8d0 kernel/trace/blktrace.c:367, CPU#0: jbd2/sda1-8/5163
> Modules linked in:
> CPU: 0 UID: 0 PID: 5163 Comm: jbd2/sda1-8 Not tainted syzkaller #0 PREEMPT(full) 
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
> RIP: 0010:__blk_add_trace+0x79c/0x8d0 kernel/trace/blktrace.c:367
> Code: ff 4d 85 e4 75 4f e8 83 0e f8 ff e9 fb fd ff ff e8 79 0e f8 ff e9 ec fd ff ff e8 6f 0e f8 ff e9 d8 fd ff ff e8 65 0e f8 ff 90 <0f> 0b 90 e9 ca fd ff ff e8 57 0e f8 ff 48 8b 7c 24 30 e8 cd 51 00
> RSP: 0018:ffffc9000e54f460 EFLAGS: 00010293
> RAX: ffffffff81c81b4b RBX: 0000000000000001 RCX: ffff8880341abc80
> RDX: 0000000000000000 RSI: 00000000901e000f RDI: 000000008000ffff
> RBP: ffffc9000e54f578 R08: ffff8880341abc80 R09: 0000000000000009
> R10: 0000000000000011 R11: 0000000000000000 R12: 000000008000ffff
> R13: ffff888075c86080 R14: 00000000901e000f R15: 0000000000000001
> FS:  0000000000000000(0000) GS:ffff888125f22000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000555577629808 CR3: 000000000dd38000 CR4: 00000000003526f0
> Call Trace:
>  <TASK>
>  blk_add_trace_bio_remap+0x4b8/0x560 kernel/trace/blktrace.c:1200
>  __do_trace_block_bio_remap include/trace/events/block.h:526 [inline]
>  trace_block_bio_remap include/trace/events/block.h:526 [inline]
>  blk_partition_remap block/blk-core.c:585 [inline]
>  submit_bio_noacct+0x187b/0x1b80 block/blk-core.c:804
>  journal_submit_commit_record+0x665/0x8b0 fs/jbd2/commit.c:156
>  jbd2_journal_commit_transaction+0x3455/0x5a00 fs/jbd2/commit.c:875
>  kjournald2+0x3cf/0x750 fs/jbd2/journal.c:201
>  kthread+0x711/0x8a0 kernel/kthread.c:463
>  ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>  </TASK>

Adding Johannes.

-- 
Jens Axboe