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Date:   Thu, 16 May 2019 14:32:01 +0200
From:   Jan Kara <>
To:     Tetsuo Handa <>
Cc:     Jan Kara <>, Jens Axboe <>,
        Alexander Viro <>,
        syzbot <>,,,,,
Subject: Re: INFO: task hung in __get_super

On Thu 16-05-19 21:17:14, Tetsuo Handa wrote:
> On 2019/05/16 20:48, Jan Kara wrote:
> > OK, so non-racy fix was a bit more involved and I've ended up just
> > upgrading the file reference to an exclusive one in loop_set_fd() instead
> > of trying to hand-craft some locking solution. The result is attached and
> > it passes blktests.
> blkdev_get() has corresponding blkdev_put().
> bdgrab() does not have corresponding bdput() ?

Yes, and that's hidden inside blkdev_put() (or failing blkdev_get()). Don't
get me started on calling conventions of these functions... I've wasted half
an hour trying to figure out where I'm leaking inode references in my patch


Jan Kara <>

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