netdev - Re: [Bugme-new] [Bug 16626] New: Machine hangs with EIP at skb_copy_and_csum

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Date:	Mon, 23 Aug 2010 14:35:42 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Plamen Petrov <pvp-lsts@...uni-ruse.bg>
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bugme-new] [Bug 16626] New: Machine hangs with EIP at
 skb_copy_and_csum_dev

Le lundi 23 août 2010 à 14:47 +0300, Plamen Petrov a écrit :

> Well, here is the current status:
> 
> Last I promised I will stay on 2.6.36-rc1-git for as long as possible,
> so here is what I achieved:
> 
> >
> root@fs:/boot# w; uname -a
> >  12:08:18 up 3 days, 24 min,  1 user,  load average: 1.21, 1.29, 1.17
> > USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
> > root     pts/0    192.168.10.159   12:04    0.00s  0.02s  0.00s w
> > Linux fs 2.6.36-rc1-FS-00127-g763008c #1 SMP Thu Aug 19 07:10:57 UTC 2010 i686 Intel(R) Pentium(R) D CPU 3.00GHz GenuineIntel GNU/Linux
> 
> Yeah, 3 days and counting, right until I decided to try the freshly
> announced 2.6.36-rc2.
> 
> So I upgraded the kernel, but left the scripts that turn GRO off for
> the tg3 card still run at system startup. This way the system ran for
> 2 and a half hours, when I decided its time to try turning GRO on.
> 
> I first tried to turn GRO on for the tg3 nic, and the system oopsed
> immediately (if the panic screen is necessary - please, ask for it).
> 
> After the system came back, I tried turning GRO on for the 2 RealTek
> 8139 nics, too, but ethtool only accepted turning GRO off.
> 
> And unfortunately, I can't test if other nics will fail the same way
> as the motherboard integrated tg3 I have does, so for now, this is
> only a tg3 + GRO on problem; I don't have any other hardware to test
> with available.

There was no change in latest kernel in this area.

Should you have only tg3 cards, I guess there would be no bug.

Bug is probably a combination of :

1) tg3 + GRO , or any card enabling GRO
2) Some network code (netfilter ?)
3) a 8139too, or any card calling skb_copy_and_csum_dev()



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