linux-kernel - Re: [syzbot] [block?] possible deadlock in blk_mq_update_nr_hw

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Message-ID: <6873a473.a70a0220.3b380f.0031.GAE@google.com>
Date: Sun, 13 Jul 2025 05:20:03 -0700
From: syzbot <syzbot+6279b273d888c2017726@...kaller.appspotmail.com>
To: axboe@...nel.dk, hch@....de, linux-block@...r.kernel.org, 
	linux-kernel@...r.kernel.org, ming.lei@...hat.com, netdev@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [block?] possible deadlock in blk_mq_update_nr_hw_queues

syzbot has bisected this issue to:

commit f1be1788a32e8fa63416ad4518bbd1a85a825c9d
Author: Ming Lei <ming.lei@...hat.com>
Date:   Fri Oct 25 00:37:20 2024 +0000

    block: model freeze & enter queue as lock for supporting lockdep

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14ea5d82580000
start commit:   a52f9f0d77f2 Merge tag 'batadv-next-pullrequest-20250710' ..
git tree:       net-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=16ea5d82580000
console output: https://syzkaller.appspot.com/x/log.txt?x=12ea5d82580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f8235fb7e74dd7f6
dashboard link: https://syzkaller.appspot.com/bug?extid=6279b273d888c2017726
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14321d82580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=179590f0580000

Reported-by: syzbot+6279b273d888c2017726@...kaller.appspotmail.com
Fixes: f1be1788a32e ("block: model freeze & enter queue as lock for supporting lockdep")

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