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Re: iptables/vmalloc issues on alchemy

To: Josh Green <>
Subject: Re: iptables/vmalloc issues on alchemy
From: Dan Malek <>
Date: Wed, 27 Apr 2005 15:06:00 -0400
Cc:, Pete Popov <>, Herbert Valerio Riedel <>
In-reply-to: <1114627785.17008.21.camel@SillyPuddy.localdomain>
Original-recipient: rfc822;
References: <1114505009.11315.37.camel@mini.intra> <1114627785.17008.21.camel@SillyPuddy.localdomain>

On Apr 27, 2005, at 2:49 PM, Josh Green wrote:

...... I was
planning on doing some additional gdb debugging of the failure
(especially the initial large MMAP attempt by iptables, which was 1.5GB
in my case).

Oh wait ....  I found a bug a while ago from someone trying to load
large modules.  There is a problem if the kernel grows to need
additional PTE tables, the top level pointers don't get propagated
correctly and subsequent access by a thread that didn't actually
do the allocation would fail.  I'm looking into this, including your
past message about 64-bit PTEs.


        -- Dan

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