linux-kernel - Re: [syzbot] possible deadlock in throtl_pending_timer

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Message-ID: <CAFj5m9+Gc-t6vD17yWBNos-fk9vmhUTLsXYGrSx4Bdzn7R67JQ@mail.gmail.com>
Date:   Wed, 30 Mar 2022 10:52:38 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     syzbot <syzbot+934ebb67352c8a490bf3@...kaller.appspotmail.com>
Cc:     Jens Axboe <axboe@...nel.dk>, cgroups@...r.kernel.org,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tj@...nel.org
Subject: Re: [syzbot] possible deadlock in throtl_pending_timer_fn

On Wed, Mar 30, 2022 at 5:23 AM syzbot
<syzbot+934ebb67352c8a490bf3@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    cb7cbaae7fd9 Merge tag 'drm-next-2022-03-25' of git://anon..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17ef8b43700000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7094767cefc58fb9
> dashboard link: https://syzkaller.appspot.com/bug?extid=934ebb67352c8a490bf3
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+934ebb67352c8a490bf3@...kaller.appspotmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
for-5.18/block

It should be fixed by:

https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=for-5.18/block&id=d578c770c85233af592e54537f93f3831bde7e9a

Thanks,