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

From: Laurent Riffard
Date: Sat Sep 29 2007 - 05:22:26 EST

Le 29.09.2007 10:31, Andrew Morton a écrit :
> On Fri, 28 Sep 2007 21:48:18 +0200 Laurent Riffard <laurent.riffard@xxxxxxx> wrote:
>> Hi,
>> >From time to time, I experience some complete network hangs:
>> Suddenly, all network connections become unresponsive. Even "ping
>>" 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". 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 and my PC
is at (fixed IP).

/--- telephone line
| ADSL box |
| 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" 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 U 0 0 0 eth0 U 0 0 0 eth0 UG 0 0 0 eth0

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

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