Re: CONFIG_SLAB_DEBUG and NUMA API

From: R. J. Wysocki (rjwysocki_at_sisk.pl)
Date: 07/07/04

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    To: Andi Kleen <ak@muc.de>, Andrew Morton <akpm@osdl.org>
    Date:	Wed, 7 Jul 2004 10:10:59 +0200
    
    

    On Tuesday 06 of July 2004 23:03, Andi Kleen wrote:
    > On Mon, Jul 05, 2004 at 11:49:45PM -0700, Andrew Morton wrote:
    > > Andi Kleen <ak@muc.de> wrote:
    > > > I tested 2.6.7-mm6 with NUMA on with CONFIG_SLAB_DEBUG and I didn't see
    > > > any oopses. Do you have a recipe to reproduce them?
    > >
    > > Still happens here. Booting SLES9.1 with the attached config.
    >
    > [...]
    >
    > Here's a patch. The problem was that the kernel exit would allocate
    > memory to send exit signals after the local mempolicy was already freed,
    > but not zeroed. When the allocator tried to grab more memory it would
    > fall over.
    >
    > -Andi
    >
    > -------------------------------------------------------------
    >
    > Move the memory policy freeing to later in exit to make sure
    > the last memory allocations don't use an uninitialized policy

    It fixed the problems that I had reported on both 2.6.7-mm6 and 2.6.7-bk18.
    Thanks a lot,

    rjw

    -- 
    Rafael J. Wysocki
    ----------------------------
    For a successful technology, reality must take precedence over public 
    relations, for nature cannot be fooled.
    					-- Richard P. Feynman
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