linux-kernel - Re: WARN in do_rt

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Message-ID: <20140515155415.GA326@redhat.com>
Date:	Thu, 15 May 2014 11:54:15 -0400
From:	Dave Jones <davej@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mateusz Guzik <mguzik@...hat.com>, Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: WARN in do_rt_tgsigqueueinfo()

On Thu, May 15, 2014 at 05:04:12PM +0200, Peter Zijlstra wrote:

 > > > trinity$ MALLOC_CHECK_=0 ./trinity -xinit_module -xreboot -xshutdown -xunshare -xnfsservctl -xclock_nanosleep -xuselib -xumount -xmount -m --quiet -C 400 -l off -xmremap
 > > > 
 > > > [watchdog] kernel became tainted! (512/0) Last seed was 4072360471
 > > > 
 > > > [15908.562512] ------------[ cut here ]------------
 > > > [15908.567245] WARNING: CPU: 22 PID: 3312 at /usr/src/linux-2.6/kernel/signal.c:3060 do_rt_tgsigqueueinfo+0xb4/0xc0()
 > > > 
 > > > This is apparently a very common thing to hit according to google.
 > > 
 > > Well, it warns about an argument received from userland, so nothing fishy
 > > going on as far as kernel consistency is concerned if that's what you mean.
 > 
 > I hadn't looked that far.. I just manged to hit it two times in a row
 > while waiting for my bug to trigger.

There's a ton of 'noise' like this that fuzzing turns up.
I've been collecting some of the stuff to shut it up..

http://codemonkey.org.uk/junk/silence-fuzz-testing-noise.patch
http://codemonkey.org.uk/junk/silence-noisy-deprecated-warnings-while-fuzzing.patch

I'm of the opinion that a user-triggerable WARN is a bug, but aparently
not everyone else feels that way.

	Dave

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