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

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Date:   Fri, 6 Apr 2018 17:43:43 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     viro@...iv.linux.org.uk, osandov@...com, dvyukov@...gle.com,
        bot+abdba5bc6de135d7622f00756da97998425b6de5@...kaller.appspotmail.com,
        axboe@...nel.dk, tom.leiming@...il.com, hare@...e.de, shli@...com,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        mingo@...hat.com, linux-fsdevel@...r.kernel.org, knikanth@...e.de
Subject: Re: INFO: task hung in lo_ioctl

On Fri, Apr 06, 2018 at 10:55:03PM +0900, Tetsuo Handa wrote:
> Peter Zijlstra wrote:
> > On Fri, Apr 06, 2018 at 09:04:18PM +0900, Tetsuo Handa wrote:
> > > +	/* Temporary hack for handling lock imbalance. */
> > > +	if (__mutex_owner(&lo->lo_ctl_mutex) == current)
> > > +		mutex_unlock(&lo->lo_ctl_mutex);
> > 
> > ARGGH.. you didn't read the comment we put on that?
> > 
> 
> Commit 5b52330bbfe63b33 ("audit: fix auditd/kernel connection state tracking")
> is using __mutex_owner(). ;-)

That got removed and the warning added.