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To: Daniel Phillips <phillips@arcor.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Kernel BUG at page_alloc.c:91! (2.4.19)
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From: "Heiko Carstens" <Heiko.Carstens@de.ibm.com>
Date: Mon, 2 Sep 2002 14:54:47 +0200
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Hi Daniel,

>> Looks to me that this function itself has a bug: after the drop_pte 
label
>> it is checked if the current page has a mapping. If this is true there 
is
>> ...
>Chances are, you've run into the subtle double-free race I've been 
working
>on for the last few days.  Would you like to try this patch as see if it
>makes a difference?
>http://nl.linux.org/~phillips/patches/lru.race-2.4.19

Thanks for the patch but unfortunately it doesn't change the behaviour at
all. This BUG is still 100% reproducible by just having 1 process which
allocates memory chunks of 256KB and after each allocation writes to each
of the pages in order to make them dirty.

regards,
Heiko

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