linux-kernel - Re: vfs: INFO: possible circular locking dependency detected

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Message-ID: <20120509184909.GA27705@redhat.com>
Date:	Wed, 9 May 2012 14:49:09 -0400
From:	Dave Jones <davej@...hat.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: vfs: INFO: possible circular locking dependency detected

On Wed, May 09, 2012 at 07:13:29PM +0200, Sasha Levin wrote:
 > On Wed, May 9, 2012 at 6:37 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
 > > If that's _all_ that happened, I'm not particulary
 > > concerned; it's not pretty, but saying "thou shalt not grab ->cred_guard_mutex
 > > anywhere in ->read() on anything that has exec bits or might get one" is
 > > not too terrible.  If that's something else, though, we might have a real
 > > problem...
 > 
 > That's probably the case. The proc file got chmodded and exec'ed.
 > 
 > Can we do something to eliminate this false positive though? I can't
 > think of anything nice...
 > 
 > btw,
 > I've never seen this issue before, even though I run same tests for a
 > while now. What could have triggered it now?

Assuming you're running trinity du-jour, I only added fuzzing of execve yesterday.

	Dave

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