netdev - Re: RT patches expose netdev race [was Re: [RFC] [patch 2/2] powerpc 2.6.21-rt1: fix kernel hang and/or panic

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Message-Id: <20070516.174101.45179259.davem@davemloft.net>
Date:	Wed, 16 May 2007 17:41:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	linas@...tin.ibm.com
Cc:	benh@...nel.crashing.org, tsutomu.owa@...hiba.co.jp,
	linuxppc-dev@...abs.org, mingo@...e.hu, tglx@...utronix.de,
	netdev@...r.kernel.org
Subject: Re: RT patches expose netdev race [was Re: [RFC] [patch 2/2]
 powerpc 2.6.21-rt1: fix kernel hang and/or panic

From: linas@...tin.ibm.com (Linas Vepstas)
Date: Wed, 16 May 2007 19:18:02 -0500

> Hi,
> 
> On Tue, May 15, 2007 at 08:09:02PM +1000, Benjamin Herrenschmidt wrote:
> > On Tue, 2007-05-15 at 17:47 +0900, Tsutomu OWA wrote:
> > >   I encountered the following error when doing netperf from other machine 
> > > to Celleb running RT kernel.  PREEPT_NONE kernel works just fine as well.
> > 
> > Hrm... sounds a bit weird. I wonder if there's a locking bug in the
> > driver in the first place.
> > 
> > Linas, what's your take ?
> 
> Heh. I almost deleted the entire email thread cause it
> didn't say "spidernet" in the subject line. :-)
> Seriously, I really almost did ....
> 
> Since this is a long email; let me put a summary up front:
> I think the RT/premption patches are exposing some sort
> of race in the ip header handling code. The rest of the 
> note is forensics pointing to this.

skb->head should never ever be NULL.
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