linux-kernel - Re: INFO: task hung in __get

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Message-ID: <71265ac6-c127-838f-d129-a9a95f755ecf@i-love.sakura.ne.jp>
Date:   Fri, 3 May 2019 19:29:26 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Jan Kara <jack@...e.cz>, Al Viro <viro@...iv.linux.org.uk>
Cc:     syzbot <syzbot+10007d66ca02b08f0e60@...kaller.appspotmail.com>,
        axboe@...nel.dk, dvyukov@...gle.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: INFO: task hung in __get_super

On 2019/05/01 0:34, Tetsuo Handa wrote:
> I still cannot understand what the problem is.
(...snipped...)
> I guessed that something went wrong with 8083 inside __getblk_gfp().
> How can loop_ctl_mutex be relevant to this problem?
> 

syzbot got similar NMI backtrace. No loop_ctl_mutex is involved.

INFO: task hung in mount_bdev (2)
https://syzkaller.appspot.com/bug?id=d9b9fa1428ff2466de64fc85256e769f516cea58