linux-kernel - Re: [BUG] 2.6.24-rc2-mm1

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Message-ID: <64bb37e0711171210x40dd500ap31e4ea4f8535349d@mail.gmail.com>
Date:	Sat, 17 Nov 2007 21:10:44 +0100
From:	"Torsten Kaiser" <just.for.lkml@...glemail.com>
To:	"Christoph Lameter" <clameter@....com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Kamalesh Babulal" <kamalesh@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
	nfs@...ts.sourceforge.net, "Andy Whitcroft" <apw@...dowen.org>,
	"Balbir Singh" <balbir@...ux.vnet.ibm.com>,
	"Jan Blunck" <jblunck@...e.de>,
	"Trond Myklebust" <trond.myklebust@....uio.no>
Subject: Re: [BUG] 2.6.24-rc2-mm1 - kernel bug on nfs v4

On Nov 17, 2007 8:33 PM, Christoph Lameter <clameter@....com> wrote:
> On Sat, 17 Nov 2007, Andrew Morton wrote:
>
> > That's slub.  It appears that list_lock is being taken from process context
> > in one place and from softirq in another.
>
> I kicked out some weird interrupt disable code in mm that was only run during
> NUMA bootstrap.

I'm using NUMA (Opteron), so this indeed fixes it.

A kernel complied with SLUB now outputs the same message as the SLAB
one, that lockdep annotations are needed at the place where nfs hangs.

> This should fix it but isnt there some mechanism to convince lockdep that
> it is okay to do these things during bootstrap?
>
> ---
>  mm/slub.c |    2 ++
>  1 file changed, 2 insertions(+)
>
> Index: linux-2.6/mm/slub.c
> ===================================================================
> --- linux-2.6.orig/mm/slub.c    2007-11-17 11:31:21.044136631 -0800
> +++ linux-2.6/mm/slub.c 2007-11-17 11:32:17.364386560 -0800
> @@ -2044,7 +2044,9 @@ static struct kmem_cache_node *early_kme
>  #endif
>         init_kmem_cache_node(n);
>         atomic_long_inc(&n->nr_slabs);
> +       local_irq_disable();
>         add_partial(kmalloc_caches, page, 0);
> +       local_irq_enable();
>         return n;
>  }
>
>
>
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