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Date: Wed, 6 Aug 2003 15:15:39 -0300 (BRT)
From: Marcelo Tosatti <marcelo@conectiva.com.br>
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To: Stephan von Krawczynski <skraw@ithnet.com>
cc: andrea@suse.de, <linux-kernel@vger.kernel.org>, <green@namesys.com>
Subject: Re: 2.4.22-pre lockups (now decoded oops for pre10)
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On Wed, 6 Aug 2003, Stephan von Krawczynski wrote:

> Unable to handle kernel NULL pointer dereference at virtual address 00000006
> c0144b14
> *pde = 00000000
> Oops: 0002
> CPU:    1
> EIP:    0010:[<c0144b14>]    Not tainted
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010246
> eax: 00000000   ebx: f0f66540   ecx: f0f66540   edx: 00000006
> esi: f0f66540   edi: f0f66540   ebp: c2ce0350   esp: c345df24
> ds: 0018   es: 0018   ss: 0018
> Process kswapd (pid: 5, stackpage=c345d000)
> Stack: c0147ddf f0f66540 00000000 c2ce0350 0001bcad c02eab68 c0139228 c2ce0350
>        000001d0 00000200 000001d0 00000016 00000020 000001d0 00000020 00000006
>        c01394b3 00000006 c345c000 c02eab68 000001d0 00000006 c02eab68 00000000 
> Call Trace:    [<c0147ddf>] [<c0139228>] [<c01394b3>] [<c013952e>] [<c013963c>]
>   [<c01396c8>] [<c01397f8>] [<c0139760>] [<c0105000>] [<c010592e>] [<c0139760>]
> Code: 89 02 c7 41 30 00 00 00 00 89 4c 24 04 e9 7a ff ff ff 8d 76 
> 
> 
> >>EIP; c0144b14 <__remove_from_queues+14/30>   <=====
> 
> >>ebx; f0f66540 <_end+30bbb320/3852ee40>
> >>ecx; f0f66540 <_end+30bbb320/3852ee40>
> >>esi; f0f66540 <_end+30bbb320/3852ee40>
> >>edi; f0f66540 <_end+30bbb320/3852ee40>
> >>ebp; c2ce0350 <_end+2935130/3852ee40>
> >>esp; c345df24 <_end+30b2d04/3852ee40>

Stephan,

I'm pretty worried about this problem.

Your oopses seem to be the result of some kind of memory corruption. On
the other oopses we could see the kernel oopsing on
remove_page_from_hash_queue due to corrupted pointers (as Willy pointed 
out). 

Can you please try to crash your box again with 

CONFIG_DEBUG_SLAB=y 

Again, thanks a lot for your reports.