linux-kernel - Re: 2.6.23-rc[68]-mm: network hangs

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Date:	Sat, 29 Sep 2007 11:22:06 +0200
From:	Laurent Riffard <laurent.riffard@...e.fr>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Kernel development list <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: 2.6.23-rc[68]-mm: network hangs

Le 29.09.2007 10:31, Andrew Morton a écrit :
> On Fri, 28 Sep 2007 21:48:18 +0200 Laurent Riffard <laurent.riffard@...e.fr> wrote:
> 
>> Hi,
>>
>> >From time to time, I experience some complete network hangs:
>>
>> Suddenly, all network connections become unresponsive. Even "ping
>> 127.0.0.1" doesn't work. SysRq-w does not show any blocked processus.
>>
>> When such hang happen, I have to reboot (shutdown does work).
>>
>> This is not easily reproducible: it happens several minutes after 
>> boot (could be 45 minutes or 2 hours). I do not use heavy networking 
>> apps (like P2P). My typical usage is a Gnome desktop with  browser, 
>> mailer, IM, video or audio streaming. 
>>
>> I have a single PC connected to a DSL router via ethernet (so no LAN 
>> with NFS or CIFS).
>>
>> This happens with 2.6.23-rc8-mm2 and 2.6.23-rc6-mm1. I can't remember 
>> when I first see this problem. Maybe 2 months ago.
>>
>> I attached the output of "strace ping 127.0.0.1". How can I collect 
>> some more data when this problem happens ?
>>
> 
> I have a second report of this from Uwe Bugla (who has been banished from
> all vger lists for various naughtinesses).
> 
> Similar story - after a few hours his network router (which is using ppp in
> some fashion) craps out and dhcp queries all time out.
> 
> I'd be suspecting a ppp bug in net-2.6.24.

mmm... I don't use PPP at all, nor dhcp. 

My DSL box act as a NAT-router. Its local adress is 192.168.0.254 and my PC 
is at 192.192.0.9 (fixed IP).

       /--- telephone line 
       |
 +----------+
 | ADSL box |
 +----------+
 192.168.0.254
       |
  192.168.0.9
 +-----------+
 |    PC     |
 +-----------+

Firstly, I suspected a bug in the DSL box, so I reset it but it did not help. 
I have to reboot the PC (don't need to reset the DSL box). 

Could a router problem prevent "ping 127.0.0.1" from working ?

[this becomes somewhat off-topic for LKML, sorry]

Here's my routing table:

linux-2.6-mm$ LANG=C netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
0.0.0.0         192.168.0.254   0.0.0.0         UG        0 0          0 eth0

It seems it lacks a route for 127.0.0.1 through lo, isn't it? In this case, if 
eth0 hangs, 127.0.0.1 hangs too, no?

So, it could be an ethernet driver bug. I'm using ne2k-pci.
-- 
laurent
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