linux-kernel - Re: [syzbot] [nbd?] possible deadlock in nbd_queue

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Message-ID: <68c9a9db.050a0220.2ff435.040b.GAE@google.com>
Date: Tue, 16 Sep 2025 11:18:03 -0700
From: syzbot <syzbot+3dbc6142c85cc77eaf04@...kaller.appspotmail.com>
To: axboe@...nel.dk, bvanassche@....org, hdanton@...a.com, 
	josef@...icpanda.com, linux-block@...r.kernel.org, 
	linux-kernel@...r.kernel.org, ming.lei@...hat.com, nbd@...er.debian.org, 
	penguin-kernel@...ove.sakura.ne.jp, syzkaller-bugs@...glegroups.com, 
	thomas.hellstrom@...ux.intel.com
Subject: Re: [syzbot] [nbd?] possible deadlock in nbd_queue_rq

syzbot has bisected this issue to:

commit ffa1e7ada456087c2402b37cd6b2863ced29aff0
Author: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
Date:   Tue Mar 18 09:55:48 2025 +0000

    block: Make request_queue lockdep splats show up earlier

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11eef762580000
start commit:   f83ec76bf285 Linux 6.17-rc6
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=13eef762580000
console output: https://syzkaller.appspot.com/x/log.txt?x=15eef762580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8f01d8629880e620
dashboard link: https://syzkaller.appspot.com/bug?extid=3dbc6142c85cc77eaf04
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1009bb62580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14833b12580000

Reported-by: syzbot+3dbc6142c85cc77eaf04@...kaller.appspotmail.com
Fixes: ffa1e7ada456 ("block: Make request_queue lockdep splats show up earlier")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection