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

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Message-Id: <200907061926.43625.andres@anarazel.de>
Date:	Mon, 6 Jul 2009 19:26:43 +0200
From:	Andres Freund <andres@...razel.de>
To:	Joao Correia <joaomiguelcorreia@...il.com>
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	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 Monday 06 July 2009 19:23:18 Joao Correia wrote:
> Hello
>
> Since i already had the kernel compiled and ready to boot when i read
> this, i gave it a go anyway :-).
>
> I can reproduce the freeze with those 4 patches applied, so i can
> confirm that its, at least, related to, or exposed by, those patches.
> There must be something else too, or its just too much fuzziness, but
> the freeze takes a bit more time (approximately five minutes, give or
> take) compared to the instant freeze before, but its there with the
> patches, and without them, no freeze.
>
> I assume there isnt a "safe" way to get them out of current .31-rc's,
> right?
`echo 0 > /proc/sys/kernel/timer_migration` should mitigate the problem.

Andres
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