linux-kernel - Re: possible deadlock in generic_file_write

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Date:   Wed, 6 Dec 2017 16:32:26 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>, Jan Kara <jack@...e.cz>,
        syzbot 
        <bot+045a1f65bdea780940bf0f795a292f4cd0b773d1@...kaller.appspotmail.com>,
        Johannes Weiner <hannes@...xchg.org>, jlayton@...hat.com,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Mel Gorman <mgorman@...hsingularity.net>, npiggin@...il.com,
        rgoldwyn@...e.com, syzkaller-bugs@...glegroups.com,
        Peter Zijlstra <peterz@...radead.org>, kernel-team@....com
Subject: Re: possible deadlock in generic_file_write_iter (2)

On Wed, 6 Dec 2017 14:05:47 +0900 Byungchul Park <byungchul.park@....com> wrote:

> > What is cross-release? Is it something new? Should we always enable
> > crossrelease_fullstack during testing?
> 
> Hello Dmitry,
> 
> Yes, it's new one making lockdep track wait_for_completion() as well.
> 
> And we should enable crossrelease_fullstack if you don't care system
> slowdown but testing.

We should update Documentation/process/submit-checklist.rst section 12.
But that list doesn't even mention CONFIG_LOCKDEP so a bit of
maintenance work will be needed there..