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Message-ID: <20110721143218.GA10595@electric-eye.fr.zoreil.com>
Date:	Thu, 21 Jul 2011 16:32:18 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Richard Kennedy <richard@....demon.co.uk>
Cc:	netdev@...r.kernel.org
Subject: Re: v3.0-rc* intermittent network failure: how to debug?

Richard Kennedy <richard@....demon.co.uk> :
> I keep seeing a total network failure on v3.0.0-rc* , it is highly
> intermittent, anything from 1 hour to 12+, and I don't have a reliable
> test case.
> When it fails I lose all network comms, but there are no errors in the
> system log, no hung tasks reported, nothing. But after it fails the
> machine hangs during shutdown, it just never turns off. So I guess
> something is getting stuck but I can't find it.

Assuming the kernel hangs late enough, you can try the "reboot=" kernel
parameter and see if a value in arch/x86/include/asm/emergency-restart.h
makes a difference.

> Can you suggest how to find out what going on? 

Switch into text mode before starting the reboot sequence then send a
magic sysrq T or W ?

> I'm going to add a serial console and see if that helps.

It will help, especially with the kilometer long output of sysrq.

> this is on a x86_64, via_velocity currently running 3.0.0-rc7 latest.
> 
> all suggestions gratefully received

Last via-velocity change in mainline dates back to may 25 (see
d10358de8d70aaeb965a974d56e9b72f6c6dbb3a). Were you previously fine
with a recent enough kernel to rule it out ?

-- 
Ueimor
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