I also get similar on a couple of test kvm hosts using vlans and bridge
interfaces for the vm's. I also tried upgrading to the testing release
and got similar output, see below for both 12.04 and testing:
Jun 10 21:04:47 host1 kernel: [ 6518.495373] WARNING: at
/build/buildd/linux-3.2.0/net/core/dev.c:1960 skb_gso_segment+0x341/0x3b0()
Jun 10 21:04:47 host1 kernel: [ 6518.495375] Hardware name: TECRA A9
Jun 10 21:04:47 host1 kernel: [ 6518.495377] 802.1Q VLAN Support:
caps=(0x20115829, 0x0) len=2076 data_len=0 ip_summed=0
Jun 10 21:04:47 host1 kernel: [ 6518.495379] Modules linked in: ip6table_filter
ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables kvm_intel kvm
nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc ext2 tpm_infineon bridge
joydev 8021q garp stp pcmcia arc4 i915 dm_multipath yenta_socket
snd_hda_codec_si3054 snd_hda_codec_realtek psmouse drm_kms_helper drm
pcmcia_rsrc serio_raw iwl4965 pcmcia_core tifm_7xx1 i2c_algo_bit tifm_core
iwl_legacy mac80211 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd
soundcore snd_page_alloc cfg80211 video tpm_tis toshiba_acpi sparse_keymap wmi
mac_hid lp parport sdhci_pci sdhci e1000e
Jun 10 21:04:47 host1 kernel: [ 6518.495420] Pid: 3634, comm: kvm Tainted: G
W 3.2.0-24-generic #39-Ubuntu
Jun 10 21:04:47 host1 kernel: [ 6518.495422] Call Trace:
Jun 10 21:04:47 host1 kernel: [ 6518.495423] <IRQ> [<ffffffff8106725f>]
warn_slowpath_common+0x7f/0xc0
Jun 10 21:04:47 host1 kernel: [ 6518.495429] [<ffffffff8155e8e5>] ?
sch_direct_xmit+0x85/0x1d0
Jun 10 21:04:47 host1 kernel: [ 6518.495432] [<ffffffff81067356>]
warn_slowpath_fmt+0x46/0x50
Jun 10 21:04:47 host1 kernel: [ 6518.495435] [<ffffffff8153e051>]
skb_gso_segment+0x341/0x3b0
Jun 10 21:04:47 host1 kernel: [ 6518.495441] [<ffffffffa037699a>] ?
br_nf_dev_queue_xmit+0x2a/0x90 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495446] [<ffffffff81541b3a>]
dev_hard_start_xmit+0x11a/0x580
Jun 10 21:04:47 host1 kernel: [ 6518.495451] [<ffffffffa0370234>] ?
br_forward_finish+0x44/0x60 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495454] [<ffffffff8154224a>]
dev_queue_xmit+0x2aa/0x420
Jun 10 21:04:47 host1 kernel: [ 6518.495458] [<ffffffff8165c885>] ?
_raw_read_unlock_bh+0x15/0x20
Jun 10 21:04:47 host1 kernel: [ 6518.495463] [<ffffffffa03701bc>]
br_dev_queue_push_xmit+0x6c/0xa0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495469] [<ffffffffa037699a>]
br_nf_dev_queue_xmit+0x2a/0x90 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495474] [<ffffffffa0377500>]
br_nf_post_routing+0x280/0x2e0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495479] [<ffffffff8156c065>]
nf_iterate+0x85/0xc0
Jun 10 21:04:47 host1 kernel: [ 6518.495484] [<ffffffffa0370150>] ?
br_flood+0xc0/0xc0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495487] [<ffffffff8156c115>]
nf_hook_slow+0x75/0x150
Jun 10 21:04:47 host1 kernel: [ 6518.495492] [<ffffffffa0370150>] ?
br_flood+0xc0/0xc0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495497] [<ffffffffa03701f0>] ?
br_dev_queue_push_xmit+0xa0/0xa0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495503] [<ffffffffa0376a00>] ?
br_nf_dev_queue_xmit+0x90/0x90 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495508] [<ffffffffa0370234>]
br_forward_finish+0x44/0x60 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495514] [<ffffffffa0376b58>]
br_nf_forward_finish+0x158/0x180 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495519] [<ffffffffa0377238>]
br_nf_forward_ip+0x378/0x3c0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495523] [<ffffffff8156c065>]
nf_iterate+0x85/0xc0
Jun 10 21:04:47 host1 kernel: [ 6518.495534] [<ffffffffa03701f0>] ?
br_dev_queue_push_xmit+0xa0/0xa0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495537] [<ffffffff8156c115>]
nf_hook_slow+0x75/0x150
Jun 10 21:04:47 host1 kernel: [ 6518.495541] [<ffffffffa03701f0>] ?
br_dev_queue_push_xmit+0xa0/0xa0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495547] [<ffffffffa03703cd>]
__br_forward+0x7d/0xd0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495551] [<ffffffffa03704bd>]
br_forward+0x5d/0x70 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495556] [<ffffffffa0371182>]
br_handle_frame_finish+0x182/0x2a0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495561] [<ffffffffa0377a00>]
br_nf_pre_routing_finish+0x290/0x360 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495566] [<ffffffffa0377e26>]
br_nf_pre_routing+0x356/0x370 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495570] [<ffffffff8156c065>]
nf_iterate+0x85/0xc0
Jun 10 21:04:47 host1 kernel: [ 6518.495575] [<ffffffffa0371000>] ?
br_handle_local_finish+0x50/0x50 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495578] [<ffffffff8156c115>]
nf_hook_slow+0x75/0x150
Jun 10 21:04:47 host1 kernel: [ 6518.495583] [<ffffffffa0371000>] ?
br_handle_local_finish+0x50/0x50 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495588] [<ffffffffa0371454>]
br_handle_frame+0x1b4/0x270 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495593] [<ffffffffa03712a0>] ?
br_handle_frame_finish+0x2a0/0x2a0 [bridge]
Jun 10 21:04:47 host1 kernel: [ 6518.495596] [<ffffffff8153f362>]
__netif_receive_skb+0x1e2/0x520
Jun 10 21:04:47 host1 kernel: [ 6518.495600] [<ffffffff8153fac1>]
process_backlog+0xb1/0x190
Jun 10 21:04:47 host1 kernel: [ 6518.495603] [<ffffffff81540df4>]
net_rx_action+0x134/0x290
Jun 10 21:04:47 host1 kernel: [ 6518.495606] [<ffffffff8106ea58>]
__do_softirq+0xa8/0x210
Jun 10 21:04:47 host1 kernel: [ 6518.495609] [<ffffffff81666fec>]
call_softirq+0x1c/0x30
Jun 10 21:04:47 host1 kernel: [ 6518.495611] <EOI> [<ffffffff81015305>]
do_softirq+0x65/0xa0
Jun 10 21:04:47 host1 kernel: [ 6518.495616] [<ffffffff815412d8>]
netif_rx_ni+0x28/0x30
Jun 10 21:04:47 host1 kernel: [ 6518.495619] [<ffffffff814784e6>]
tun_get_user+0x306/0x4a0
Jun 10 21:04:47 host1 kernel: [ 6518.495622] [<ffffffff814799c4>]
tun_chr_aio_write+0x64/0x90
Jun 10 21:04:47 host1 kernel: [ 6518.495625] [<ffffffff81479960>] ?
tun_chr_aio_read+0xd0/0xd0
Jun 10 21:04:47 host1 kernel: [ 6518.495628] [<ffffffff811782e3>]
do_sync_readv_writev+0xd3/0x110
Jun 10 21:04:47 host1 kernel: [ 6518.495631] [<ffffffff812d85e7>] ?
aa_file_perm+0x37/0x40
Jun 10 21:04:47 host1 kernel: [ 6518.495635] [<ffffffff812d7578>] ?
apparmor_file_permission+0x18/0x20
Jun 10 21:04:47 host1 kernel: [ 6518.495637] [<ffffffff8129cd4c>] ?
security_file_permission+0x2c/0xb0
Jun 10 21:04:47 host1 kernel: [ 6518.495640] [<ffffffff811779e1>] ?
rw_verify_area+0x61/0xf0
Jun 10 21:04:47 host1 kernel: [ 6518.495643] [<ffffffff811785b4>]
do_readv_writev+0xd4/0x1d0
Jun 10 21:04:47 host1 kernel: [ 6518.495646] [<ffffffff811be535>] ?
eventfd_ctx_read+0x1a5/0x210
Jun 10 21:04:47 host1 kernel: [ 6518.495649] [<ffffffff811786ec>]
vfs_writev+0x3c/0x50
Jun 10 21:04:47 host1 kernel: [ 6518.495651] [<ffffffff8117884a>]
sys_writev+0x4a/0xb0
Jun 10 21:04:47 host1 kernel: [ 6518.495654] [<ffffffff81664d82>]
system_call_fastpath+0x16/0x1b
Jun 10 21:04:47 host1 kernel: [ 6518.495656] ---[ end trace d7ec471effa04150
]---
Jun 11 00:34:31 host2 kernel: [ 1719.093676] WARNING: at
/build/buildd/linux-3.4.0/net/core/dev.c:1890 skb_warn_bad_offload+0xc2/0xcf()
Jun 11 00:34:31 host2 kernel: [ 1719.093682] Hardware name: TECRA A9
Jun 11 00:34:31 host2 kernel: [ 1719.093689] : caps=(0x0000000020115829,
0x0000000000000000) len=1812 data_len=0 gso_size=1448 gso_type=5 ip_summed=0
Jun 11 00:34:31 host2 kernel: [ 1719.093696] Modules linked in: vhost_net
macvtap macvlan ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat
ebtables x_tables kvm_intel kvm nfsd nfs lockd fscache auth_rpcgss nfs_acl
sunrpc snd_hda_codec_si3054 snd_hda_codec_realtek tpm_infineon joydev bridge
arc4 coretemp ext2 pcmcia microcode psmouse snd_hda_intel snd_hda_codec iwl4965
serio_raw iwlegacy mac80211 snd_usb_audio tifm_7xx1 snd_pcm 8021q garp uvcvideo
videobuf2_core dm_multipath yenta_socket pcmcia_rsrc stp snd_timer snd_hwdep
scsi_dh tifm_core pcmcia_core videodev snd_usbmidi_lib snd_rawmidi
snd_seq_device snd videobuf2_vmalloc cfg80211 videobuf2_memops soundcore
snd_page_alloc i915 drm_kms_helper drm i2c_algo_bit toshiba_acpi sparse_keymap
wmi video tpm_tis lp mac_hid parport sdhci_pci sdhci e1000e
Jun 11 00:34:31 host2 kernel: [ 1719.093932] Pid: 4791, comm: vhost-4761
Tainted: G W 3.4.0-5-generic #11-Ubuntu
Jun 11 00:34:31 host2 kernel: [ 1719.093939] Call Trace:
Jun 11 00:34:31 host2 kernel: [ 1719.093944] <IRQ> [<ffffffff8105025f>]
warn_slowpath_common+0x7f/0xc0
Jun 11 00:34:31 host2 kernel: [ 1719.093965] [<ffffffff81050356>]
warn_slowpath_fmt+0x46/0x50
Jun 11 00:34:31 host2 kernel: [ 1719.093976] [<ffffffff81667b7e>] ?
_raw_spin_lock+0xe/0x20
Jun 11 00:34:31 host2 kernel: [ 1719.093988] [<ffffffff81664ac0>]
skb_warn_bad_offload+0xc2/0xcf
Jun 11 00:34:31 host2 kernel: [ 1719.094000] [<ffffffff81558ae0>] ?
dev_queue_xmit+0x1c0/0x650
Jun 11 00:34:31 host2 kernel: [ 1719.094011] [<ffffffff81555371>]
skb_gso_segment+0x221/0x290
Jun 11 00:34:31 host2 kernel: [ 1719.094023] [<ffffffff815584f7>]
dev_hard_start_xmit+0x257/0x680
Jun 11 00:34:31 host2 kernel: [ 1719.094034] [<ffffffff81558ae0>] ?
dev_queue_xmit+0x1c0/0x650
Jun 11 00:34:31 host2 kernel: [ 1719.094048] [<ffffffffa04e0715>] ?
ebt_do_table+0x635/0x6f4 [ebtables]
Jun 11 00:34:31 host2 kernel: [ 1719.094060] [<ffffffff81558cb7>]
dev_queue_xmit+0x397/0x650
Jun 11 00:34:31 host2 kernel: [ 1719.094070] [<ffffffff81667d65>] ?
_raw_read_unlock_bh+0x15/0x20
Jun 11 00:34:31 host2 kernel: [ 1719.094082] [<ffffffffa04e0715>] ?
ebt_do_table+0x635/0x6f4 [ebtables]
Jun 11 00:34:31 host2 kernel: [ 1719.094101] [<ffffffffa03f1fff>]
br_dev_queue_push_xmit+0x7f/0xd0 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094119] [<ffffffffa03f86ca>]
br_nf_dev_queue_xmit+0x2a/0x90 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094137] [<ffffffffa03f8f43>]
br_nf_post_routing+0x223/0x340 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094150] [<ffffffff81582a04>]
nf_iterate+0x84/0xb0
Jun 11 00:34:31 host2 kernel: [ 1719.094166] [<ffffffffa03f1f80>] ?
deliver_clone+0x60/0x60 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094178] [<ffffffff81582aa4>]
nf_hook_slow+0x74/0x130
Jun 11 00:34:31 host2 kernel: [ 1719.094194] [<ffffffffa03f1f80>] ?
deliver_clone+0x60/0x60 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094212] [<ffffffffa03f22b0>] ?
br_multicast_flood+0x170/0x170 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094230] [<ffffffffa03f2302>]
br_forward_finish+0x52/0x60 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094247] [<ffffffffa03f87f3>]
br_nf_forward_finish+0xc3/0x190 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094265] [<ffffffffa03f92fd>]
br_nf_forward_ip+0x29d/0x400 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094276] [<ffffffff8103e989>] ?
default_spin_lock_flags+0x9/0x10
Jun 11 00:34:31 host2 kernel: [ 1719.094288] [<ffffffff81582a04>]
nf_iterate+0x84/0xb0
Jun 11 00:34:31 host2 kernel: [ 1719.094304] [<ffffffffa03f22b0>] ?
br_multicast_flood+0x170/0x170 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094316] [<ffffffff81582aa4>]
nf_hook_slow+0x74/0x130
Jun 11 00:34:31 host2 kernel: [ 1719.094332] [<ffffffffa03f22b0>] ?
br_multicast_flood+0x170/0x170 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094351] [<ffffffffa03f23a0>]
__br_forward+0x90/0xb0 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094368] [<ffffffffa03f256d>]
br_forward+0x5d/0x70 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094386] [<ffffffffa03f32c6>]
br_handle_frame_finish+0x1f6/0x290 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094404] [<ffffffffa03f8b98>]
br_nf_pre_routing_finish+0x198/0x320 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094422] [<ffffffffa03f9a15>]
br_nf_pre_routing+0x3b5/0x670 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094435] [<ffffffff81582a04>]
nf_iterate+0x84/0xb0
Jun 11 00:34:31 host2 kernel: [ 1719.094452] [<ffffffffa03f30d0>] ?
br_handle_local_finish+0x50/0x50 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094464] [<ffffffff81582aa4>]
nf_hook_slow+0x74/0x130
Jun 11 00:34:31 host2 kernel: [ 1719.094481] [<ffffffffa03f30d0>] ?
br_handle_local_finish+0x50/0x50 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094500] [<ffffffffa03f3528>]
br_handle_frame+0x1c8/0x260 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094517] [<ffffffffa03f3360>] ?
br_handle_frame_finish+0x290/0x290 [bridge]
Jun 11 00:34:31 host2 kernel: [ 1719.094530] [<ffffffff81556698>]
__netif_receive_skb+0x438/0x5b0
Jun 11 00:34:31 host2 kernel: [ 1719.094542] [<ffffffff815568d1>]
process_backlog+0xc1/0x1a0
Jun 11 00:34:31 host2 kernel: [ 1719.094555] [<ffffffff8106ce90>] ?
__queue_work+0x380/0x380
Jun 11 00:34:31 host2 kernel: [ 1719.094566] [<ffffffff81557333>]
net_rx_action+0x123/0x220
Jun 11 00:34:31 host2 kernel: [ 1719.094576] [<ffffffff81057786>]
__do_softirq+0xb6/0x1d0
Jun 11 00:34:31 host2 kernel: [ 1719.094587] [<ffffffff8167119c>]
call_softirq+0x1c/0x30
Jun 11 00:34:31 host2 kernel: [ 1719.094593] <EOI> [<ffffffff810150f5>]
do_softirq+0x75/0xb0
Jun 11 00:34:31 host2 kernel: [ 1719.094613] [<ffffffff81557998>]
netif_rx_ni+0x28/0x30
Jun 11 00:34:31 host2 kernel: [ 1719.094624] [<ffffffff8147c887>]
tun_get_user+0x2c7/0x4a0
Jun 11 00:34:31 host2 kernel: [ 1719.094636] [<ffffffff8147ca85>]
tun_sendmsg+0x25/0x30
Jun 11 00:34:31 host2 kernel: [ 1719.094647] [<ffffffffa05ad44d>]
handle_tx+0x1dd/0x520 [vhost_net]
Jun 11 00:34:31 host2 kernel: [ 1719.094659] [<ffffffffa05ad7c5>]
handle_tx_kick+0x15/0x20 [vhost_net]
Jun 11 00:34:31 host2 kernel: [ 1719.094669] [<ffffffffa05aa81f>]
vhost_worker+0xdf/0x170 [vhost_net]
Jun 11 00:34:31 host2 kernel: [ 1719.094679] [<ffffffffa05aa740>] ?
memory_access_ok.isra.11+0xd0/0xd0 [vhost_net]
Jun 11 00:34:31 host2 kernel: [ 1719.094690] [<ffffffff81072e73>]
kthread+0x93/0xa0
Jun 11 00:34:31 host2 kernel: [ 1719.094701] [<ffffffff816710a4>]
kernel_thread_helper+0x4/0x10
Jun 11 00:34:31 host2 kernel: [ 1719.094712] [<ffffffff81072de0>] ?
flush_kthread_worker+0x80/0x80
Jun 11 00:34:31 host2 kernel: [ 1719.094723] [<ffffffff816710a0>] ?
gs_change+0x13/0x13
Jun 11 00:34:31 host2 kernel: [ 1719.094730] ---[ end trace ada13452ab7e8e98
]---
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https://bugs.launchpad.net/bugs/1014350
Title:
WARNING: at /build/buildd/linux-3.2.0/net/core/dev.c:1960
skb_gso_segment+0x341/0x3b0()
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