From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joao Correia <joaomiguelcorreia@gmail.com>
Subject: Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 (
	possibly?caused by netem)
Date: Mon, 6 Jul 2009 18:23:18 +0100
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References: <200907031326.21822.andres@anarazel.de> <a5d9929e0907052153x2db851bcj26f1433c716c8a90@mail.gmail.com>
	<20090706141916.GA3477@ami.dom.local> <200907061813.29379.andres@anarazel.de>
	<20090706163106.GA4559@ami.dom.local>
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Cc: Arun R Bharadwaj <arun@linux.vnet.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Stephen Hemminger <shemminger@vyatta.com>,
	netdev@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	Andres Freund <andres@anarazel.de>
To: Jarek Poplawski <jarkao2@gmail.com>
Return-path: <netdev-owner@vger.kernel.org>
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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, r=
ight?

Thank you very much for your time,
Joao Correia


On Mon, Jul 6, 2009 at 5:31 PM, Jarek Poplawski<jarkao2@gmail.com> wrot=
e:
> 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..=
=2E That
>> > > does =A0not 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' an=
d
> you shouldn't be sorry at all! ;-)
>
> Thanks again,
> Jarek P.
>