There is stacktrace (see below) every time I start kvm virtual machine in the following setup:<br />
<br />
em1+em2 -> team0<br />
team0 (dot1q trunk) -> team0.${VLAN}<br />
bridge device for each VLAN (team0.${VLAN}) -> br${VLAN}<br />
<br />
Network definition from guest xml:<br />
<interface type='bridge'><br />
<mac address='52:54:00:71:80:f1'/><br />
<source bridge='br${VLAN}'/><br />
<model type='virtio'/><br />
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/><br />
</interface><br />
<br />
If you start guest you get:<br />
[ 4097.690893] WARNING: at net/core/dev.c:2191 skb_warn_bad_offload+0xcd/0xda()<br />
[ 4097.691914] : caps=(0x0000000200004841, 0x0000000000000000) len=2962 data_len=2896 gso_size=1448 gso_type=1 ip_summed=1<br />
[ 4097.692939] Modules linked in: vhost_net macvtap macvlan tun dm_queue_length iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip6table_filter ip6_tables ebtable_nat ebtables bridge 8021q garp stp mrp llc team_mode_activebackup team xt_comment nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_filter ip_tables sg iTCO_wdt dcdbas iTCO_vendor_support coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel ses lrw enclosure gf128mul mei_me ipmi_devintf glue_helper sb_edac ablk_helper shpchp cryptd lpc_ich mei wmi edac_core pcspkr mfd_core ipmi_si ipmi_msghandler acpi_power_meter acpi_cpufreq mperf dm_multipath ext4 mbcache jbd2 sd_mod crc_t10dif crct10dif_common mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper ttm ixgbe<br />
[ 4097.698114] ahci drm libahci mdio ptp libata i2c_core pps_core megaraid_sas dca dm_mirror dm_region_hash dm_log dm_mod<br />
[ 4097.699280] CPU: 20 PID: 0 Comm: swapper/20 Tainted: G W -------------- 3.10.0-123.20.1.el7.x86_64 #1<br />
[ 4097.700434] Hardware name: Dell Inc. PowerEdge M620/0NJVT7, BIOS 2.4.3 07/02/2014<br />
[ 4097.701572] ffff88142fb43938 d1e099852c0d05d9 ffff88142fb438f0 ffffffff815e2b0c<br />
[ 4097.702589] ffff88142fb43928 ffffffff8105dee1 ffff8814016bad00 ffff8827e7828000<br />
[ 4097.703703] 0000000000000001 0000000000000001 ffff8814016bad00 ffff88142fb43990<br />
[ 4097.704748] Call Trace:<br />
[ 4097.705776] <IRQ> [<ffffffff815e2b0c>] dump_stack+0x19/0x1b<br />
[ 4097.706722] [<ffffffff8105dee1>] warn_slowpath_common+0x61/0x80<br />
[ 4097.707714] [<ffffffff8105df5c>] warn_slowpath_fmt+0x5c/0x80<br />
[ 4097.708716] [<ffffffff812be763>] ? ___ratelimit+0x93/0x100<br />
[ 4097.709736] [<ffffffff815e59f6>] skb_warn_bad_offload+0xcd/0xda<br />
[ 4097.710755] [<ffffffff814d1ec9>] __skb_gso_segment+0x79/0xb0<br />
[ 4097.711749] [<ffffffff814d21ba>] dev_hard_start_xmit+0x18a/0x570<br />
[ 4097.712761] [<ffffffff814f153e>] sch_direct_xmit+0xee/0x1c0<br />
[ 4097.713764] [<ffffffff814f1699>] __qdisc_run+0x89/0x150<br />
[ 4097.714751] [<ffffffff814d283e>] dev_queue_xmit+0x29e/0x4a0<br />
[ 4097.715761] [<ffffffffa03654f0>] ? br_forward_finish+0x60/0x60 [bridge]<br />
[ 4097.716772] [<ffffffffa036529b>] br_dev_queue_push_xmit+0x7b/0xc0 [bridge]<br />
[ 4097.717768] [<ffffffffa03654b2>] br_forward_finish+0x22/0x60 [bridge]<br />
[ 4097.718786] [<ffffffffa0365570>] __br_forward+0x80/0xf0 [bridge]<br />
[ 4097.719794] [<ffffffff814c1d7d>] ? skb_clone+0x5d/0xb0<br />
[ 4097.720789] [<ffffffffa03654f0>] ? br_forward_finish+0x60/0x60 [bridge]<br />
[ 4097.721826] [<ffffffffa0365203>] deliver_clone+0x33/0x50 [bridge]<br />
[ 4097.722826] [<ffffffffa03657bd>] br_flood+0xbd/0x140 [bridge]<br />
[ 4097.723822] [<ffffffffa0365985>] br_flood_forward+0x15/0x20 [bridge]<br />
[ 4097.724851] [<ffffffffa0366680>] br_handle_frame_finish+0x1b0/0x3c0 [bridge]<br />
[ 4097.725851] [<ffffffffa0366a05>] br_handle_frame+0x175/0x260 [bridge]<br />
[ 4097.726879] [<ffffffff814d01a2>] __netif_receive_skb_core+0x282/0x870<br />
[ 4097.727908] [<ffffffff8101a0d9>] ? read_tsc+0x9/0x20<br />
[ 4097.728899] [<ffffffff814d07a8>] __netif_receive_skb+0x18/0x60<br />
[ 4097.729893] [<ffffffff814d0830>] netif_receive_skb+0x40/0xd0<br />
[ 4097.730925] [<ffffffff814d1290>] napi_gro_receive+0x80/0xb0<br />
[ 4097.731920] [<ffffffffa01210ac>] ixgbe_clean_rx_irq+0x7ac/0xb00 [ixgbe]<br />
[ 4097.732818] [<ffffffffa01220f1>] ixgbe_poll+0x481/0x7e0 [ixgbe]<br />
[ 4097.733848] [<ffffffff8108a196>] ? hrtimer_get_next_event+0xb6/0xc0<br />
[ 4097.734846] [<ffffffff814d0bfa>] net_rx_action+0x15a/0x250<br />
[ 4097.735841] [<ffffffff81067047>] __do_softirq+0xf7/0x290<br />
[ 4097.736901] [<ffffffff815f4b5c>] call_softirq+0x1c/0x30<br />
[ 4097.737891] [<ffffffff81014cf5>] do_softirq+0x55/0x90<br />
[ 4097.738876] [<ffffffff810673e5>] irq_exit+0x115/0x120<br />
[ 4097.739893] [<ffffffff815f5458>] do_IRQ+0x58/0xf0<br />
[ 4097.740871] [<ffffffff815ea5ad>] common_interrupt+0x6d/0x6d<br />
[ 4097.741851] <EOI> [<ffffffff81483af2>] ? cpuidle_enter_state+0x52/0xc0<br />
[ 4097.742760] [<ffffffff81483c25>] cpuidle_idle_call+0xc5/0x200<br />
[ 4097.743746] [<ffffffff8101bc7e>] arch_cpu_idle+0xe/0x30<br />
[ 4097.744742] [<ffffffff810b47e5>] cpu_startup_entry+0xf5/0x290<br />
[ 4097.745757] [<ffffffff815d0a6e>] start_secondary+0x1c4/0x1da<br />
[ 4097.746731] ---[ end trace 73d533a3bdca4bf1 ]---
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