linux-kernel - Re: [syzbot] [block?] [usb?] WARNING: bad unlock balance in blk_mq_update_tag_set

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Message-ID: <CAFj5m9+1dZtWufO0xzGgWPyMjD1NZ_a-kfeW+Q3ujH_rnR09hg@mail.gmail.com>
Date: Wed, 6 Nov 2024 11:52:39 +0800
From: Ming Lei <ming.lei@...hat.com>
To: syzbot <syzbot+5007209c85ecdb50b5da@...kaller.appspotmail.com>
Cc: axboe@...nel.dk, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [block?] [usb?] WARNING: bad unlock balance in blk_mq_update_tag_set_shared

On Wed, Nov 6, 2024 at 10:38 AM syzbot
<syzbot+5007209c85ecdb50b5da@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    c88416ba074a Add linux-next specific files for 20241101
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=12d34740580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=704b6be2ac2f205f
> dashboard link: https://syzkaller.appspot.com/bug?extid=5007209c85ecdb50b5da
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16d34740580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/760a8c88d0c3/disk-c88416ba.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/46e4b0a851a2/vmlinux-c88416ba.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/428e2c784b75/bzImage-c88416ba.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+5007209c85ecdb50b5da@...kaller.appspotmail.com
>
> =====================================
> WARNING: bad unlock balance detected!
> 6.12.0-rc5-next-20241101-syzkaller #0 Not tainted
> -------------------------------------
> kworker/1:1/57 is trying to release lock (&q->q_usage_counter(queue)) at:
> [<ffffffff8497aa7f>] blk_mq_update_tag_set_shared+0x27f/0x350 block/blk-mq.c:4131
> but there are no more locks to release!

#syz test: https://github.com/ming1/linux.git for-next