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Sat, 25 Oct 2025 06:35:18 -0700 (PDT) Message-ID: Date: Sat, 25 Oct 2025 07:35:16 -0600 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [block?] [trace?] WARNING in __blk_add_trace To: syzbot , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com, Johannes Thumshirn References: <68fc07a0.a70a0220.3bf6c6.01aa.GAE@google.com> Content-Language: en-US From: Jens Axboe In-Reply-To: <68fc07a0.a70a0220.3bf6c6.01aa.GAE@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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@syzkaller.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: > > 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 > Adding Johannes. -- Jens Axboe