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

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Message-ID: <20090702110940.GA7402@ff.dom.local>
Date:	Thu, 2 Jul 2009 11:09:40 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Joao Correia <joaomiguelcorreia@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>,
	Andres Freund <andres@...razel.de>
Subject: Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 (possibly
	caused by netem)

On Thu, Jul 02, 2009 at 11:51:56AM +0100, Joao Correia wrote:
> Im getting this one too. On any .31-rc1-gitXX, it pops up a few
> seconds after i turn traffic shaping on with tc/htb (no netem here).
> Its easily reproducible on my end, turn on traffic shaping, get
> traffic flowing, box freezes. No error message, nothing on logs,
> although -sometimes- i get lockdep error messages on screen, but
> scrolls too fast and box is otherwise unresponsive, so i can't get the
> error out.
> 
> This does not happen on 2.6.30 at all.
> 
> Hope this helps.
> 
> (i tried both CONFIG_PACKET_MMAP off and the patch, still happens).

It helps for sure - to save on useless checking, and maybe reproduce
too.

Thank you very much Joao,
Jarek P.
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