netdev - Re: kernel BUG at net/core/skbuff.c:2839 RIP [<ffffffff819109a2>] skb

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Message-ID: <1385043004.10637.34.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 21 Nov 2013 06:10:04 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sander Eikelenboom <linux@...elenboom.it>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: kernel BUG at net/core/skbuff.c:2839 RIP  [<ffffffff819109a2>]
 skb_segment+0x6b2/0x6d0

On Thu, 2013-11-21 at 13:00 +0100, Sander Eikelenboom wrote:
> Hello Sander,
> 
> Sunday, November 17, 2013, 8:17:44 PM, you wrote:
> 
> > Hi Eric,
> 
> > With the linux-net changes from this merge window i get the kernel panic below (not with 3.12.0).
> 
> > It's on a machine running Xen, 2x rtl8169 nic, and using a bridge for guest networking.
> > This panic in the host kernel only seems to occur when generating a lot of network traffic to and from a guest.
> 
> > I tried reverting "tcp: gso: fix truesize tracking" 0d08c42cf9a71530fef5ebcfe368f38f2dd0476f, but that didn't help.

> Hi Eric and Francois,
> 
> I have tested some more:
> 
> First tried with switching off GSO and GRO on the bridge, this didn't help.
> Then i only switched off GRO on eth0 (r8169) and left the bridge alone. That helped to prevent the oops.
> 
> Below the output of ethtool -k for the bridge and eth0 after boot (so the default situation) with which the oops occurs.
> And the part of dmesg where the r8169 get initialized on boot (there are 2, eth0 and eth1).

As mentioned earlier, this problem is known and a patch is under review.

http://marc.info/?l=linux-netdev&m=138419594024851&w=2

Thanks


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