Hi all,

Interesting thing I found out this afternoon. I have a FreeBSD 10 guest
with virtio drivers, both disk and net.

The VM works fine, but when I connect over SSH to the VM, I see this stack
trace in messages on the node:

Feb 23 19:19:42 hv3 kernel: ------------[ cut here ]------------
Feb 23 19:19:42 hv3 kernel: WARNING: at net/core/dev.c:1907
skb_warn_bad_offload+0xc2/0xf0() (Tainted: G        W  ---------------   )
Feb 23 19:19:42 hv3 kernel: Hardware name: X9DR3-F
Feb 23 19:19:42 hv3 kernel: igb: caps=(0x12114bb3, 0x0) len=5686
data_len=5620 ip_summed=0
Feb 23 19:19:42 hv3 kernel: Modules linked in: ebt_arp nfs lockd fscache
auth_rpcgss nfs_acl sunrpc bonding 8021q garp ebtable_nat ebtables bridge
stp llc xt_physdev ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_multiport
iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6
xt_state nf_conntrack ip6table_filter ip6_tables ipv6 dm_round_robin
dm_multipath vhost_net macvtap macvlan tun kvm_intel kvm iTCO_wdt
iTCO_vendor_support sg ixgbe mdio sb_edac edac_core lpc_ich mfd_core
i2c_i801 ioatdma igb dca i2c_algo_bit i2c_core ptp pps_core ext4 jbd2
mbcache sd_mod crc_t10dif 3w_sas ahci isci libsas scsi_transport_sas
dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]
Feb 23 19:19:42 hv3 kernel: Pid: 15280, comm: vhost-15276 Tainted: G
 W  ---------------    2.6.32-431.5.1.el6.x86_64 #1
Feb 23 19:19:42 hv3 kernel: Call Trace:
Feb 23 19:19:42 hv3 kernel: <IRQ>  [<ffffffff81071e27>] ?
warn_slowpath_common+0x87/0xc0
Feb 23 19:19:42 hv3 kernel: [<ffffffff81071f16>] ?
warn_slowpath_fmt+0x46/0x50
Feb 23 19:19:42 hv3 kernel: [<ffffffffa016c862>] ?
igb_get_drvinfo+0x82/0xe0 [igb]
Feb 23 19:19:42 hv3 kernel: [<ffffffff8145b1d2>] ?
skb_warn_bad_offload+0xc2/0xf0
Feb 23 19:19:42 hv3 kernel: [<ffffffff814602c1>] ?
__skb_gso_segment+0x71/0xc0
Feb 23 19:19:42 hv3 kernel: [<ffffffff81460323>] ? skb_gso_segment+0x13/0x20
Feb 23 19:19:42 hv3 kernel: [<ffffffff814603cb>] ?
dev_hard_start_xmit+0x9b/0x480
Feb 23 19:19:42 hv3 kernel: [<ffffffff8147bf5a>] ?
sch_direct_xmit+0x15a/0x1c0
Feb 23 19:19:42 hv3 kernel: [<ffffffff81460a58>] ?
dev_queue_xmit+0x228/0x320
Feb 23 19:19:42 hv3 kernel: [<ffffffffa035a898>] ?
br_dev_queue_push_xmit+0x88/0xc0 [bridge]
Feb 23 19:19:42 hv3 kernel: [<ffffffffa035a928>] ?
br_forward_finish+0x58/0x60 [bridge]
Feb 23 19:19:42 hv3 kernel: [<ffffffffa035a9da>] ? __br_forward+0xaa/0xd0
[bridge]
Feb 23 19:19:42 hv3 kernel: [<ffffffff814897b6>] ? nf_hook_slow+0x76/0x120
Feb 23 19:19:42 hv3 kernel: [<ffffffffa035aa5d>] ? br_forward+0x5d/0x70
[bridge]
Feb 23 19:19:42 hv3 kernel: [<ffffffffa035ba6b>] ?
br_handle_frame_finish+0x17b/0x2a0 [bridge]
Feb 23 19:19:42 hv3 kernel: [<ffffffffa035bd3a>] ?
br_handle_frame+0x1aa/0x250 [bridge]
Feb 23 19:19:42 hv3 kernel: [<ffffffff8145b7c9>] ?
__netif_receive_skb+0x529/0x750
Feb 23 19:19:42 hv3 kernel: [<ffffffff8145ba8a>] ?
process_backlog+0x9a/0x100
Feb 23 19:19:42 hv3 kernel: [<ffffffff81460d43>] ? net_rx_action+0x103/0x2f0
Feb 23 19:19:42 hv3 kernel: [<ffffffff8107a8e1>] ? __do_softirq+0xc1/0x1e0
Feb 23 19:19:42 hv3 kernel: [<ffffffff8100c30c>] ? call_softirq+0x1c/0x30
Feb 23 19:19:42 hv3 kernel: <EOI>  [<ffffffff8100fa75>] ?
do_softirq+0x65/0xa0
Feb 23 19:19:42 hv3 kernel: [<ffffffff814611c8>] ? netif_rx_ni+0x28/0x30
Feb 23 19:19:42 hv3 kernel: [<ffffffffa01a0749>] ? tun_sendmsg+0x229/0x4ec
[tun]
Feb 23 19:19:42 hv3 kernel: [<ffffffffa027bcf5>] ? handle_tx+0x275/0x5e0
[vhost_net]
Feb 23 19:19:42 hv3 kernel: [<ffffffffa027c095>] ? handle_tx_kick+0x15/0x20
[vhost_net]
Feb 23 19:19:42 hv3 kernel: [<ffffffffa027955c>] ? vhost_worker+0xbc/0x140
[vhost_net]
Feb 23 19:19:42 hv3 kernel: [<ffffffffa02794a0>] ? vhost_worker+0x0/0x140
[vhost_net]
Feb 23 19:19:42 hv3 kernel: [<ffffffff8109aee6>] ? kthread+0x96/0xa0
Feb 23 19:19:42 hv3 kernel: [<ffffffff8100c20a>] ? child_rip+0xa/0x20
Feb 23 19:19:42 hv3 kernel: [<ffffffff8109ae50>] ? kthread+0x0/0xa0
Feb 23 19:19:42 hv3 kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Feb 23 19:19:42 hv3 kernel: ---[ end trace e93142595d6ecfc7 ]---

This is 100% reproducable, every time. The login itself works just fine.
Some more info:

[root@hv3 ~]# uname -a
Linux hv3.ovirt.gs.cloud.lan 2.6.32-431.5.1.el6.x86_64 #1 SMP Wed Feb 12
00:41:43 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
[root@hv3 ~]# rpm -qa | grep vdsm
vdsm-4.13.3-3.el6.x86_64
vdsm-xmlrpc-4.13.3-3.el6.noarch
vdsm-python-4.13.3-3.el6.x86_64
vdsm-cli-4.13.3-3.el6.noarch

-- 
Met vriendelijke groeten / With kind regards,
Johan Kooijman

E m...@johankooijman.com
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