linux-kernel - Re: BUG at mm/slub.c:374

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Message-ID: <alpine.DEB.2.00.1205100920250.18664@router.home>
Date:	Thu, 10 May 2012 09:21:14 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: BUG at mm/slub.c:374

On Thu, 10 May 2012, richard -rw- weinberger wrote:

> On Wed, May 9, 2012 at 4:14 PM, Christoph Lameter <cl@...ux.com> wrote:
> > On Wed, 9 May 2012, richard -rw- weinberger wrote:
> >
> >> A few minutes ago I saw this BUG within one of my KVM machines.
> >> Config is attached.
> >
> > Interrupts on in __cmpxchg_double_slab called from __slab_alloc? Does KVM
> > do some tricks with interrupt flags? I do not see how that can be
> > otherwise since __slab_alloc disables interrupts on entry and reenables on
> > exit.
>
> Dunno.
> So far I've seen this BUG only once. :-\

Hmmm... allocate_slab() does some dangerous games with the "flag" variable
which determines if interrupts are to be reenabled and disabled but I
cannot see how it could have the effect that you are seeing.

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