linux-kernel - Re: tty: deadlock between n_tracerouter_receivebuf and flush_to

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Message-ID: <1453255746.3122.44.camel@linux.intel.com>
Date:	Tue, 19 Jan 2016 18:09:06 -0800
From:	J Freyensee <james_p_freyensee@...ux.intel.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: tty: deadlock between n_tracerouter_receivebuf and
 flush_to_ldisc

On Fri, 2016-01-15 at 16:33 +0000, One Thousand Gnomes wrote:
> On Fri, 15 Jan 2016 08:51:39 +0100
> Dmitry Vyukov <dvyukov@...gle.com> wrote:
> 
> > On Wed, Dec 30, 2015 at 11:44 AM, Dmitry Vyukov <dvyukov@...gle.com
> > > wrote:
> > > Hello,
> > > 
> > > I've got the following lock order inversion report on
> > > 8513342170278468bac126640a5d2d12ffbff106 (Dec 28). Unfortunately
> > > I
> > > failed to find a reproducer for it.
> > 
> > Ping. This is the most frequent failure during my testing now. J
> > Freyensee, you seem to wrote drivers/tty/n_tracerouter.c. Please
> > take
> > a look. Thanks.

I did look at the report but didn't see how n_tracerouter could be
causing the issue.  I apologize for not responding, and I thank you so
very much for providing the thorough explanation, Alan.

Jay

> 
> Alan