From mboxrd@z Thu Jan  1 00:00:00 1970
From: Justin Dossey <jbd@justindossey.com>
Subject: Linux x86 guest panics in skb_copy_bits
Date: Sun, 3 May 2009 11:40:47 -0700
Message-ID: <ce02da610905031140w76c44964sac142c1965621e98@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: QUOTED-PRINTABLE
To: kvm@vger.kernel.org
Return-path: <kvm-owner@vger.kernel.org>
Received: from yx-out-2324.google.com ([74.125.44.28]:54994 "EHLO
	yx-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1753207AbZECSkr convert rfc822-to-8bit (ORCPT
	<rfc822;kvm@vger.kernel.org>); Sun, 3 May 2009 14:40:47 -0400
Received: by yx-out-2324.google.com with SMTP id 3so1973309yxj.1
        for <kvm@vger.kernel.org>; Sun, 03 May 2009 11:40:47 -0700 (PDT)
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

Hi all,

I have a pretty straightforward setup.

Hypervisor:
dual xeon e5205 running Gentoo Linux
kernel 2.6.27 with virtio devices enabled
kvm 84
libvirt 0.5.1

Guest:
32-bit, virtio for nic and disk, qcow2.
Linux 2.6.28.

Network is bridged using tap and brctl.

I'm running Apache on the guest.=C2=A0 Whenever I send enough data thro=
ugh
the virtual NIC, I get a panic in skb_copy_bits.=C2=A0 I've tried using=
 the
e1000 driver instead of the virtio one, but that makes no difference.

Has anyone else seen this behavior before?=C2=A0 I got this on 2.6.27 a=
nd 2.6.28.

Here's a snippet:

[280204.340016]=C2=A0 [<c02253e2>] panic+0x4e/0xea
[280204.340016]=C2=A0 [<c05906b9>] oops_end+0x8f/0xa3
[280204.340016]=C2=A0 [<c0204e94>] die+0x57/0x5f
[280204.340016]=C2=A0 [<c0592192>] do_page_fault+0x605/0x6bc
[280204.340016]=C2=A0 [<c059010d>] ? _spin_lock+0x15/0x18
[280204.340016]=C2=A0 [<c04bfad8>] ? __qdisc_run+0xe6/0x1a7
[280204.340016]=C2=A0 [<c0591b8d>] ? do_page_fault+0x0/0x6bc
[280204.340016]=C2=A0 [<c0590482>] error_code+0x72/0x78
[280204.340016]=C2=A0 [<c04ace8c>] ? skb_copy_bits+0x4f/0x1c4
[280204.340016]=C2=A0 [<c0215864>] ? kvm_set_pte+0x26/0x29
[280204.340016]=C2=A0 [<c054889c>] xdr_skb_read_bits+0x1f/0x37
[280204.340016]=C2=A0 [<c054872b>] xdr_partial_copy_from_skb+
0x117/0x16c
[280204.340016]=C2=A0 [<c0549ec4>] xs_tcp_data_recv+0x245/0x3de
[280204.340016]=C2=A0 [<c054887d>] ? xdr_skb_read_bits+0x0/0x37
[280204.340016]=C2=A0 [<c04e07d6>] tcp_read_sock+0x8c/0x1e2
[280204.340016]=C2=A0 [<c0549c7f>] ? xs_tcp_data_recv+0x0/0x3de
[280204.340016]=C2=A0 [<c054a5d1>] xs_tcp_data_ready+0x54/0x64
[280204.340016]=C2=A0 [<c04e9469>] tcp_rcv_established+0x524/0x7b7
[280204.340016]=C2=A0 [<c04ee4b2>] tcp_v4_do_rcv+0x173/0x2dc


--
Justin Dossey