From mboxrd@z Thu Jan  1 00:00:00 1970
From: Patrick McHardy <kaber@trash.net>
Subject: Re: Deadlocks
Date: Mon, 21 Jun 2004 02:46:19 +0200
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References: <20040609180909.GA11445@linuxace.com> <1087156709.11287.8.camel@ws> <20040615044723.GA16891@linuxace.com> <40CE95DE.9090703@trash.net> <20040617155946.GA28564@linuxace.com> <40D1C4BF.8070605@trash.net> <20040618171214.GA750@linuxace.com>
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To: Phil Oester <kernel@linuxace.com>
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Phil Oester wrote:
> Well, it lasted about 36 hours -- not much longer than usual.  Unfortunately,
> the stack appears to have been corrupted, so I can't get a decent backtrace.
> Here is what I could get off of SysRQ-P:
> 
> Pid: 0, comm:              swapper
> EIP: 0060:[<c0258b15>] CPU: 1
> EIP is at tcp_find_option+0x55/0xa0
>  EFLAGS: 00000203    Not tainted  (2.6.7)
> EAX: 000000fe EBX: 00000040 ECX: 00000002 EDX: 00000034
> ESI: 00000018 EDI: f89c39bc EBP: 00000000 DS: 007b ES: 007b
> CR0: 8005003b CR2: 080da0b4 CR3: 379cc000 CR4: 000006d0
> Stack pointer is garbage, not printing trace
> 
> Perhaps of interest, not sure, but the FTP server at 10.0.16.197 frequently
> shows duplicate expectations, as shown below shortly after rebooting:
> 
> EXPECTING: - use=1 proto=6 src=10.0.16.197 dst=10.0.53.248 sport=0 dport=4353 
> EXPECTING: - use=1 proto=6 src=10.0.16.197 dst=10.0.53.248 sport=0 dport=4353 
> EXPECTING: - use=1 proto=6 src=10.0.16.197 dst=10.0.53.248 sport=0 dport=4353 

Not sure either, but it's a start. Have you tried running the box with
netfilter debugging enabled ? Please also apply the ip_nf_assert fix
from pom-ng, otherwise CONFIG_NETFILTER_DEBUG won't help much.
BTW: Is the box a router or is conntrack running on the FTP server
itself ?

> Unless you've got any other ideas, may have to revert this box to non-SMP
> so I can have a peaceful weekend ;-)

No more ideas currently .. ;(

> Phil
> 

Regards
Patrick