linux-kernel - Re: Kernel 3.0: Instant kernel crash when mounting CIFS (also crashes with linux-3.1-rc2

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Date:	Wed, 17 Aug 2011 16:45:44 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Jeff Layton <jlayton@...ba.org>
cc:	Jesper Juhl <jj@...osbits.net>, linux-kernel@...r.kernel.org,
	Alan Piszcz <ap@...arrain.com>,
	Steve French <sfrench@...ba.org>, linux-cifs@...r.kernel.org
Subject: Re: Kernel 3.0: Instant kernel crash when mounting CIFS (also crashes
 with linux-3.1-rc2



On Wed, 17 Aug 2011, Jeff Layton wrote:

> The crash is happening in the bowels of the slab allocator.
> Specifically, it looks like it's hitting this:
>
>                /*
>                 * The slab was either on partial or free list so
>                 * there must be at least one object available for
>                 * allocation.
>                 */
>                BUG_ON(slabp->inuse >= cachep->num);
>
> ...which looks like maybe the accounting of in-use objects is off. This
> really sounds like some sort of memory corruption. I've not been able
> to reproduce this so far, but I also had someone report panic here that
> might be related:
>
>    https://bugzilla.redhat.com/show_bug.cgi?id=731278
>
> One thing that might be helpful is turning on page poisoning and
> redoing this test, that might make it crash sooner and point out the
> source of the corruption.
>
> Even better would be a bisect to track down the cause...


Hi Jeff,

root@...rlw:/usr/src/linux# grep CONFIG_PAGE_POISONING .config
root@...rlw:/usr/src/linux# ls -l ../linux
lrwxrwxrwx 1 root root 13 Aug 17 14:41 ../linux -> linux-3.1-rc2/
root@...rlw:/usr/src/linux#

In what kernel is that feature available, or, how do I enable it?

Justin.

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