Virtio driver error on Ubuntu

ISO: fuel-4.0-200-2013-12-24_15-55-47.iso
Steps to reproduce:
1. With libvirt 1.2.0 and qemu 1.6.1 create VM#1 with 2 virtio net card for controller and VM#2 with 1 virtio net card Fuel
2. Install Fuel on VM#1
3. Create a new OpenStack environment with nova network on Ubuntu 12.04
4. Login to controller
3. Check dmesg out

dmesg contains a lot of trace logs

[70092.498293] ------------[ cut here ]------------
[70092.498302] WARNING: at /build/buildd/linux-lts-raring-3.8.0/net/core/dev.c:2032 skb_warn_bad_offload+0xcb/0xd6()
[70092.498303] Hardware name: Bochs
[70092.498304] virtio_net: caps=(0x00000000401b4a69, 0x0000000000000000) len=2029 data_len=2001 gso_size=1480 gso_type=2 ip_summed=3
[70092.498305] Modules linked in: xt_state(F) xt_CT(F) iptable_raw(F) xt_comment(F) xt_multiport(F) ip6table_filter(F) ip6_tables(F) iptable_filter(F) 8021q(F) garp(F) stp(F) llc(F) openvswitch(OF) xt_CHECKSUM(F) xt_tcpudp(F) iptable_mangle(F) ip_tables(F) x_tables(F) xfs(F) libcrc32c(F) ppdev(F) psmouse(F) mac_hid(F) virtio_balloon(F) serio_raw(F) microcode(F) virtio_console(F) parport_pc(F) i2c_piix4(F) nf_conntrack_ipv6(F) nf_defrag_ipv6(F) nf_conntrack_ipv4(F) nf_conntrack(F) nf_defrag_ipv4(F) lp(F) parport(F) floppy(F)
[70092.498325] Pid: 1422, comm: rs:main Q:Reg Tainted: GF W O 3.8.0-31-generic #46~precise1-Ubuntu
[70092.498326] Call Trace:
[70092.498331] [<ffffffff81059b2f>] warn_slowpath_common+0x7f/0xc0
[70092.498333] [<ffffffff81059c26>] warn_slowpath_fmt+0x46/0x50
[70092.498335] [<ffffffff816efbc5>] skb_warn_bad_offload+0xcb/0xd6
[70092.498338] [<ffffffff81045cd9>] ? default_spin_lock_flags+0x9/0x10
[70092.498342] [<ffffffff815dfcd2>] skb_checksum_help+0x152/0x160
[70092.498344] [<ffffffffa01ae025>] checksum_tg+0x25/0x30 [xt_CHECKSUM]
[70092.498347] [<ffffffffa00c51a5>] ipt_do_table+0x315/0x450 [ip_tables]
[70092.498349] [<ffffffffa00c50b7>] ? ipt_do_table+0x227/0x450 [ip_tables]
[70092.498351] [<ffffffffa008f1db>] iptable_mangle_hook+0x4b/0x60 [iptable_mangle]
[70092.498354] [<ffffffff8160fcdf>] nf_iterate+0x8f/0xd0
[70092.498356] [<ffffffff8161b170>] ? ip_fragment+0x880/0x880
[70092.498358] [<ffffffff8160fd9d>] nf_hook_slow+0x7d/0x150
[70092.498360] [<ffffffff8161b170>] ? ip_fragment+0x880/0x880
[70092.498362] [<ffffffff81619730>] ? ip_forward_options+0x200/0x200
[70092.498364] [<ffffffff8161beb2>] ip_output+0x82/0x90
[70092.498366] [<ffffffff8161b5c2>] ? __ip_local_out+0xa2/0xb0
[70092.498367] [<ffffffff8161b5f9>] ip_local_out+0x29/0x30
[70092.498369] [<ffffffff8161c939>] ip_send_skb+0x19/0x50
[70092.498372] [<ffffffff816431b5>] udp_send_skb+0x115/0x2a0
[70092.498373] [<ffffffff81619940>] ? ip_setup_cork+0x140/0x140
[70092.498375] [<ffffffff81643d02>] udp_sendmsg+0x312/0x940
[70092.498377] [<ffffffff8164ea31>] inet_sendmsg+0x61/0xb0
[70092.498380] [<ffffffff81312fe7>] ? apparmor_socket_sendmsg+0x17/0x20
[70092.498382] [<ffffffff815ca4f2>] sock_sendmsg+0xd2/0xf0
[70092.498385] [<ffffffff812369f3>] ? ext4_file_write+0x93/0xe0
[70092.498387] [<ffffffff810b8fa6>] ? get_futex_key+0x166/0x2f0
[70092.498389] [<ffffffff815ccd7a>] ? move_addr_to_kernel+0x5a/0xa0
[70092.498391] [<ffffffff815cd8fd>] sys_sendto+0x13d/0x190
[70092.498393] [<ffffffff811af392>] ? sys_select+0xd2/0x100
[70092.498396] [<ffffffff816fcbdd>] system_call_fastpath+0x1a/0x1f
[70092.498397] ---[ end trace 6ef3689a91d6dd3b ]---