netdev - Re: [3.15-rc3] Bisected: xen-netback mangles packets between two guests on a bridge since merge of "TX grant mapping with SKBTX_DEV

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Date:	Tue, 6 May 2014 18:13:44 +0100
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	Steven Haigh <netwiz@....id.au>,
	Sander Eikelenboom <linux@...elenboom.it>
CC:	<netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	<xen-devel@...ts.xen.org>
Subject: Re: [3.15-rc3] Bisected: xen-netback mangles packets between two
 guests on a bridge since merge of "TX grant mapping with SKBTX_DEV_ZEROCOPY
 instead of copy" series.

On 06/05/14 18:07, Steven Haigh wrote:
> On a related note, I'm seeing this on an Arch Linux DomU and kernel
> 3.14.2. Its running aria2c bit torrent client.
>
> The Dom0 is EL6 with Xen 4.2.4 / 3.14.2 kernel.
>
> I also lodged this on the Arch bug tracker:
> 	https://bugs.archlinux.org/task/40244
>
> In a nutshell, I see:
> [ 7432.398096] xen_netfront: xennet: skb rides the rocket: 19 slots
> [ 7434.270870] xen_netfront: xennet: skb rides the rocket: 19 slots
> [ 7434.782199] xen_netfront: xennet: skb rides the rocket: 19 slots
> [ 7435.184794] xen_netfront: xennet: skb rides the rocket: 19 slots
> [ 7437.530677] xen_netfront: xennet: skb rides the rocket: 19 slots
> [ 7437.973905] xen_netfront: xennet: skb rides the rocket: 19 slots
> [ 7438.383947] xen_netfront: xennet: skb rides the rocket: 19 slots

Can you also see packet corruption? You can find a testfile generator in 
Sander's mail, downloading from an Apache server with wget seems to be OK.

Zoli
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