From: David Miller <davem@davemloft.net>
To: linas@austin.ibm.com
Cc: linuxppc-dev@ozlabs.org, netdev@vger.kernel.org, mingo@elte.hu,
tglx@linutronix.de
Subject: Re: RT patches expose netdev race [was Re: [RFC] [patch 2/2] powerpc 2.6.21-rt1: fix kernel hang and/or panic
Date: Wed, 16 May 2007 17:41:01 -0700 (PDT) [thread overview]
Message-ID: <20070516.174101.45179259.davem@davemloft.net> (raw)
In-Reply-To: <20070517001801.GB4325@austin.ibm.com>
From: linas@austin.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.
next prev parent reply other threads:[~2007-05-17 0:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-15 8:35 [RFC] [patch 0/2] powerpc 2.6.21-rt1: fix kernel hang and/or panic Tsutomu OWA
2007-05-15 8:44 ` [RFC] [patch 1/2] " Tsutomu OWA
2007-05-15 8:47 ` [RFC] [patch 2/2] " Tsutomu OWA
2007-05-15 10:09 ` Benjamin Herrenschmidt
2007-05-17 0:18 ` RT patches expose netdev race [was " Linas Vepstas
2007-05-17 0:41 ` David Miller [this message]
2007-05-17 23:52 ` Linas Vepstas
2007-05-18 5:36 ` Tsutomu OWA
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