netdev - Re: [PATCH] net: fix race in the receive/select

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Message-ID: <20090701084430.GC4769@jolsa.lab.eng.brq.redhat.com>
Date:	Wed, 1 Jul 2009 10:44:30 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Andi Kleen <andi@...stfloor.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, fbl@...hat.com, nhorman@...hat.com,
	davem@...hat.com, oleg@...hat.com, eric.dumazet@...il.com
Subject: Re: [PATCH] net: fix race in the receive/select

On Wed, Jul 01, 2009 at 04:31:44PM +0800, Herbert Xu wrote:
> On Wed, Jul 01, 2009 at 09:22:26AM +0200, Andi Kleen wrote:
> >
> > Agreed.
> > 
> > I suspect the reordering of the wake queue tests might makes a difference, but
> > in this case to ensure they are always tested in the proper order by
> > the compiler would need more smp_rmb()s
> 
> I just looked up the original bug report and it's against RHEL4
> which is a 2.6.9 kernel.  Jiri, have we reproduced this on a more
> recent kernel?

no, only RHEL 4.. 

it is very hard to reproduce. I was succesfull once
on RHEL4 after 8 days, never on upstream though.

jirka

> 
> Thanks,
> -- 
> Visit Openswan at http://www.openswan.org/
> Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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