netdev - Re: Fw: [Bug 82471] New: net/core/dev.c skb_war_bad

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Date:	Wed, 17 Dec 2014 10:55:53 +0100
From:	Michal Kubecek <mkubecek@...e.cz>
To:	Richard Laager <rlaager@...tel.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Fw: [Bug 82471] New: net/core/dev.c skb_war_bad_offload

On Wed, Dec 17, 2014 at 02:44:12AM -0600, Richard Laager wrote:
> Previous history of this thread:
> http://thread.gmane.org/gmane.linux.network/326672
> 
> On 2014-11-04 22:57:19, Tom Herbert wrote:
> > Using vlan and bonding? vlan_dev_hard_start_xmit called. A possible
> > cause is that bonding interface is out of sync with slave interface
> > w.r.t. GSO features. Do we know if this worked in 3.14, 3.15?
> 
> I'm seeing the same sort of crash/warning (skb_war_bad_offload). It's
> happening on Intel 10 Gig NICs using the ixgbe driver. I'm using bridges
> (for virtual machines) on top of VLANs on top of 802.3ad bonding. I'm
> using an MTU of 9000 on the bond0 interface, but 1500 everywhere else.
> 
> I'm always bonding two ports: one one system, I'm bonding two ports on
> identical one-port NICs; on another system, I'm bonding two ports on a
> single two-port NIC. Both systems exhibit the same behavior.
> 
> Everything has worked fine for a couple years on Ubuntu 12.04 Precise
> (Linux 3.2.0). It immediately broke when I upgraded to Ubuntu 14.04
> Trusty (Linux 3.13.0). I can also reproduce this using the packaged
> version of Linux 3.16.0 on Trusty.

Would it be possible that the kernel you are using has

  da08143b8520 ("vlan: more careful checksum features handling")

(and possibly also a9b3ace44c7d and 3625920b62c3) but not

  db115037bb57 ("net: fix checksum features handling in netif_skb_features()")

?

Michal Kubecek

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