linux-kernel - Re: [3.15-rc3] rtmutex-debug assertion.

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Date:	Thu, 8 May 2014 17:28:54 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Jones <davej@...hat.com>
cc:	Linux Kernel <linux-kernel@...r.kernel.org>, peterz@...radead.org,
	davidlohr@...com, Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [3.15-rc3] rtmutex-debug assertion.

On Mon, 5 May 2014, Dave Jones wrote:

> On Mon, May 05, 2014 at 08:08:02PM +0200, Thomas Gleixner wrote:
>  
>  > I twisted my brain around that for a fricking long time, but I really
>  > can't see the failure in the code.
>  > 
>  > Neither did I succeed to trigger the issue in a VM (with and without
>  > function tracing) on Linus latest.
>  > 
>  > I grabbed trinity source and did:
>  > 
>  > # ./trinity -l off -c futex -q
>  > 
>  > That should be enough, right?
> 
> yeah, that should do it.  That's with the version from git, or the
> last tarball ?  (I really should do another tarball release)

git
 
> Maybe try with -c <some number bigger than processor count>.
> On my 4 way haswell, I run with -C40 just to keep things busy while some
> processes idle. For something like futex, which sleeps a lot, this might
> be important.
> 
>  > All I see in dmesg are occasional ooms which kill random trinity
>  > childs. 
> 
> hm, that sounds odd. if it's only fuzzing futex, it shouldn't be
> doing much memory allocation.

It has a fast memory leak of some sort.

9271 tglx      20   0  198908  75320   2992 S   0.7  7.4   0:01.94 trinity-c0
9271 tglx      20   0  256888 104368   2992 S   3.3 10.2   0:02.78 trinity-c0

Thanks,

	tglx
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