netdev - Re: EPT: Misconfiguration

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Date:	Sat, 5 Mar 2011 19:57:43 +0100
From:	Ruben Kerkhof <ruben@...enkerkhof.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>, kvm <kvm@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: EPT: Misconfiguration

On Sun, Feb 27, 2011 at 11:46, Avi Kivity <avi@...hat.com> wrote:
>
> Copying netdev: looks like memory corruption in the networking stack.
>
> Archive link: http://www.spinics.net/lists/kvm/msg50651.html (for the
> attachment).

There's now only a single guest running on this host (Ubuntu Maverick).
I've also upgraded the host kernel to 2.6.38-rc6, and this just
happened (after a day or so):

2011-03-05T19:41:58.328866+01:00 phy005 kernel: [85271.656862] BUG
kmalloc-2048 (Not tainted): Object padding overwritten
2011-03-05T19:41:58.328870+01:00 phy005 kernel: [85271.656864]
-----------------------------------------------------------------------------
2011-03-05T19:41:58.328875+01:00 phy005 kernel: [85271.656866]
2011-03-05T19:41:58.328885+01:00 phy005 kernel: [85271.656870] INFO:
0xffff880c0d52a960-0xffff880c0d52a967. First byte 0x0 instead of 0x5a
2011-03-05T19:41:58.328890+01:00 phy005 kernel: [85271.656880] INFO:
Allocated in __netdev_alloc_skb+0x1f/0x3b age=16039 cpu=5 pid=0
2011-03-05T19:41:58.328894+01:00 phy005 kernel: [85271.656886] INFO:
Freed in skb_release_data+0xa5/0xaa age=0 cpu=5 pid=1766
2011-03-05T19:41:58.328898+01:00 phy005 kernel: [85271.656890] INFO:
Slab 0xffffea002a2ea0c0 objects=15 used=13 fp=0xffff880c0d52a120
flags=0xc00000000040c1
2011-03-05T19:41:58.328902+01:00 phy005 kernel: [85271.656894] INFO:
Object 0xffff880c0d52a120 @offset=8480 fp=0xffff880c0d52d2d0
2011-03-05T19:41:58.328905+01:00 phy005 kernel: [85271.656895]
2011-03-05T19:41:58.328909+01:00 phy005 kernel: [85271.656897] Bytes
b4 0xffff880c0d52a110:  14 89 12 05 01 00 00 00 5a 5a 5a 5a 5a 5a 5a
5a ........ZZZZZZZZ
2011-03-05T19:41:58.328913+01:00 phy005 kernel: [85271.656909]
Object 0xffff880c0d52a120:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
6b 6b kkkkkkkkkkkkkkkk

We have a quite complex network stack, two interfaces (igb) attached
to bond0, with on top two bridges and on that two vlans.
The guest is running a vpn and an IPv6 tunnel.

Let me know if more info is needed.

Kind regards,

Ruben
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