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

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Message-ID: <20190430031144.GG23075@ZenIV.linux.org.uk>
Date:   Tue, 30 Apr 2019 04:11:44 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Jan Kara <jack@...e.cz>
Cc:     syzbot <syzbot+10007d66ca02b08f0e60@...kaller.appspotmail.com>,
        axboe@...nel.dk, dvyukov@...gle.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, penguin-kernel@...ove.sakura.ne.jp,
        syzkaller-bugs@...glegroups.com
Subject: Re: INFO: task hung in __get_super

On Tue, Apr 30, 2019 at 04:55:01AM +0200, Jan Kara wrote:

> Yeah, you're right. And if we push the patch a bit further to not take
> loop_ctl_mutex for invalid ioctl number, that would fix the problem. I
> can send a fix.

Huh?  We don't take it until in lo_simple_ioctl(), and that patch doesn't
get to its call on invalid ioctl numbers.  What am I missing here?