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

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Message-ID: <20180406121411.GJ4082@hirez.programming.kicks-ass.net>
Date:   Fri, 6 Apr 2018 14:14:11 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Omar Sandoval <osandov@...com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot 
        <bot+abdba5bc6de135d7622f00756da97998425b6de5@...kaller.appspotmail.com>,
        Jens Axboe <axboe@...nel.dk>, Ming Lei <tom.leiming@...il.com>,
        Hannes Reinecke <hare@...e.de>, shli@...com,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com, Ingo Molnar <mingo@...hat.com>,
        linux-fsdevel@...r.kernel.org,
        Nikanth Karthikesan <knikanth@...e.de>
Subject: Re: INFO: task hung in lo_ioctl

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?