linux-kernel - Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 ( possibly?caused by netem)

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Message-ID: <20090703061213.GA4847@ff.dom.local>
Date:	Fri, 3 Jul 2009 06:12:13 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Andres Freund <andres@...razel.de>
Cc:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 (
	possibly?caused by netem)

On Fri, Jul 03, 2009 at 03:31:31AM +0200, Andres Freund wrote:
...
> Ok. I finally see the light. I bisected the issue down to
> eea08f32adb3f97553d49a4f79a119833036000a :  timers: Logic to move non
> pinned timers
>
> Disabling timer migration like provided in the earlier commit stops the 
> issue from occuring.
>
> That it is related to timers is sensible in the light of my findings, 
> that I could trigger the issue only when using delay in netem - that is 
> the codepath using qdisc_watchdog...

Andres, thanks for your work and time. It saved me a lot of searching,
because I wasn't able to trigger this on my old box.

Jarek P.
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