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

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Date:	Mon, 6 Jul 2009 18:23:18 +0100
From:	Joao Correia <joaomiguelcorreia@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>
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>,
	Andres Freund <andres@...razel.de>
Subject: Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 ( 
	possibly?caused by netem)

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?

Thank you very much for your time,
Joao Correia

On Mon, Jul 6, 2009 at 5:31 PM, Jarek Poplawski<jarkao2@...il.com> wrote:
> On Mon, Jul 06, 2009 at 06:13:29PM +0200, Andres Freund wrote:
> ...
>> > > Btw, I ran netem with delay for more than 48h on around 80mbit... That
>> > > does  not exclude such a rarely triggered race, but makes it a bit more
>> > > unlikely. (With migration thats around 3sec or so)
> ...
>> Sorry once more.
>
> Andres, the bisection + the above - you did 'the whole lotta work' and
> you shouldn't be sorry at all! ;-)
>
> Thanks again,
> Jarek P.
>
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