Message-ID: <1418805852.5277.25.camel@watermelon.coderich.net>
Date:	Wed, 17 Dec 2014 02:44:12 -0600
From:	Richard Laager <rlaager@...tel.com>
To:	netdev@...r.kernel.org
Subject: Re: Fw: [Bug 82471] New: net/core/dev.c skb_war_bad_offload

Previous history of this thread:
http://thread.gmane.org/gmane.linux.network/326672

On 2014-11-04 22:57:19, Tom Herbert wrote:
> Using vlan and bonding? vlan_dev_hard_start_xmit called. A possible
> cause is that bonding interface is out of sync with slave interface
> w.r.t. GSO features. Do we know if this worked in 3.14, 3.15?

I'm seeing the same sort of crash/warning (skb_war_bad_offload). It's
happening on Intel 10 Gig NICs using the ixgbe driver. I'm using bridges
(for virtual machines) on top of VLANs on top of 802.3ad bonding. I'm
using an MTU of 9000 on the bond0 interface, but 1500 everywhere else.

I'm always bonding two ports: one one system, I'm bonding two ports on
identical one-port NICs; on another system, I'm bonding two ports on a
single two-port NIC. Both systems exhibit the same behavior.

Everything has worked fine for a couple years on Ubuntu 12.04 Precise
(Linux 3.2.0). It immediately broke when I upgraded to Ubuntu 14.04
Trusty (Linux 3.13.0). I can also reproduce this using the packaged
version of Linux 3.16.0 on Trusty.

In contrast to other reports of this bug, disabling scatter gather on
the physical interfaces (e.g. eth0) does *not* stop the crashes
(assuming I disabled it correctly).

I currently have two systems (one with Precise, one with Trusty)
available to do any testing that you'd find helpful.

Here's a first pass at getting some debugging data.

The broken system (Ubuntu 14.04 Trusty):

rlaager@...KEN:~$ uname -a
Linux BROKEN 3.13.0-43-generic #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux

rlaager@...KEN:~$ ethtool -k p6p1
Features for p6p1:
rx-checksumming: on
tx-checksumming: on
	tx-checksum-ipv4: on
	tx-checksum-ip-generic: off [fixed]
	tx-checksum-ipv6: on
	tx-checksum-fcoe-crc: on [fixed]
	tx-checksum-sctp: on
scatter-gather: on
	tx-scatter-gather: on
	tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
	tx-tcp-segmentation: on
	tx-tcp-ecn-segmentation: off [fixed]
	tx-tcp6-segmentation: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: on
highdma: on [fixed]
rx-vlan-filter: on
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: on [fixed]
tx-gre-segmentation: off [fixed]
tx-ipip-segmentation: off [fixed]
tx-sit-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
tx-mpls-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: on
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off

rlaager@...KEN:~$ ethtool -k bond0
Features for bond0:
rx-checksumming: off [fixed]
tx-checksumming: on
	tx-checksum-ipv4: off [fixed]
	tx-checksum-ip-generic: on
	tx-checksum-ipv6: off [fixed]
	tx-checksum-fcoe-crc: off [fixed]
	tx-checksum-sctp: off [fixed]
scatter-gather: on
	tx-scatter-gather: on
	tx-scatter-gather-fraglist: off [requested on]
tcp-segmentation-offload: on
	tx-tcp-segmentation: on
	tx-tcp-ecn-segmentation: on
	tx-tcp6-segmentation: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: on
rx-vlan-filter: on
vlan-challenged: off [fixed]
tx-lockless: on [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-ipip-segmentation: off [fixed]
tx-sit-segmentation: off [fixed]
tx-udp_tnl-segmentation: on
tx-mpls-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: off [requested on]
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off [fixed]
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off [fixed]

rlaager@...KEN:~$ ethtool -k br7
Features for br7:
rx-checksumming: off [fixed]
tx-checksumming: on
	tx-checksum-ipv4: off [fixed]
	tx-checksum-ip-generic: on
	tx-checksum-ipv6: off [fixed]
	tx-checksum-fcoe-crc: off [fixed]
	tx-checksum-sctp: off [fixed]
scatter-gather: on
	tx-scatter-gather: on
	tx-scatter-gather-fraglist: off [requested on]
tcp-segmentation-offload: on
	tx-tcp-segmentation: on
	tx-tcp-ecn-segmentation: on
	tx-tcp6-segmentation: on
udp-fragmentation-offload: off [requested on]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: off [fixed]
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: on
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: on [fixed]
netns-local: on [fixed]
tx-gso-robust: off [requested on]
tx-fcoe-segmentation: off [requested on]
tx-gre-segmentation: on
tx-ipip-segmentation: on
tx-sit-segmentation: on
tx-udp_tnl-segmentation: on
tx-mpls-segmentation: on
fcoe-mtu: off [fixed]
tx-nocache-copy: off [requested on]
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off [fixed]
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off [fixed]

rlaager@...KEN:~$ lspci
00:00.0 Host bridge: Intel Corporation 5520 I/O Hub to ESI Port (rev 22)
00:01.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 1 (rev 22)
00:03.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 3 (rev 22)
00:05.0 PCI bridge: Intel Corporation 5520/X58 I/O Hub PCI Express Root Port 5 (rev 22)
00:07.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 7 (rev 22)
00:09.0 PCI bridge: Intel Corporation 7500/5520/5500/X58 I/O Hub PCI Express Root Port 9 (rev 22)
00:0d.0 Host bridge: Intel Corporation Device 343a (rev 22)
00:0d.1 Host bridge: Intel Corporation Device 343b (rev 22)
00:0d.2 Host bridge: Intel Corporation Device 343c (rev 22)
00:0d.3 Host bridge: Intel Corporation Device 343d (rev 22)
00:0d.4 Host bridge: Intel Corporation 7500/5520/5500/X58 Physical Layer Port 0 (rev 22)
00:0d.5 Host bridge: Intel Corporation 7500/5520/5500 Physical Layer Port 1 (rev 22)
00:0d.6 Host bridge: Intel Corporation Device 341a (rev 22)
00:0e.0 Host bridge: Intel Corporation Device 341c (rev 22)
00:0e.1 Host bridge: Intel Corporation Device 341d (rev 22)
00:0e.2 Host bridge: Intel Corporation Device 341e (rev 22)
00:0e.4 Host bridge: Intel Corporation Device 3439 (rev 22)
00:13.0 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub I/OxAPIC Interrupt Controller (rev 22)
00:14.0 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub System Management Registers (rev 22)
00:14.1 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers (rev 22)
00:14.2 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub Control Status and RAS Registers (rev 22)
00:14.3 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub Throttle Registers (rev 22)
00:16.0 System peripheral: Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device (rev 22)
00:16.1 System peripheral: Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device (rev 22)
00:16.2 System peripheral: Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device (rev 22)
00:16.3 System peripheral: Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device (rev 22)
00:16.4 System peripheral: Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device (rev 22)
00:16.5 System peripheral: Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device (rev 22)
00:16.6 System peripheral: Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device (rev 22)
00:16.7 System peripheral: Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device (rev 22)
00:1a.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #4
00:1a.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #5
00:1a.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #6
00:1a.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2
00:1c.0 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 1
00:1d.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #1
00:1d.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #2
00:1d.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #3
00:1d.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #1
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90)
00:1f.0 ISA bridge: Intel Corporation 82801JIR (ICH10R) LPC Interface Controller
00:1f.2 SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA AHCI Controller
00:1f.3 SMBus: Intel Corporation 82801JI (ICH10 Family) SMBus Controller
01:03.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 (rev 0a)
03:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 02)
05:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
05:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
fe:00.0 Host bridge: Intel Corporation Xeon 5600 Series QuickPath Architecture Generic Non-core Registers (rev 02)
fe:00.1 Host bridge: Intel Corporation Xeon 5600 Series QuickPath Architecture System Address Decoder (rev 02)
fe:02.0 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 0 (rev 02)
fe:02.1 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 0 (rev 02)
fe:02.2 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 0 (rev 02)
fe:02.3 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 1 (rev 02)
fe:02.4 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 1 (rev 02)
fe:02.5 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 1 (rev 02)
fe:03.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Registers (rev 02)
fe:03.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Target Address Decoder (rev 02)
fe:03.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller RAS Registers (rev 02)
fe:03.4 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Test Registers (rev 02)
fe:04.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Control (rev 02)
fe:04.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Address (rev 02)
fe:04.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Rank (rev 02)
fe:04.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Thermal Control (rev 02)
fe:05.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Control (rev 02)
fe:05.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Address (rev 02)
fe:05.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Rank (rev 02)
fe:05.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Thermal Control (rev 02)
fe:06.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Control (rev 02)
fe:06.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Address (rev 02)
fe:06.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Rank (rev 02)
fe:06.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Thermal Control (rev 02)
ff:00.0 Host bridge: Intel Corporation Xeon 5600 Series QuickPath Architecture Generic Non-core Registers (rev 02)
ff:00.1 Host bridge: Intel Corporation Xeon 5600 Series QuickPath Architecture System Address Decoder (rev 02)
ff:02.0 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 0 (rev 02)
ff:02.1 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 0 (rev 02)
ff:02.2 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 0 (rev 02)
ff:02.3 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 1 (rev 02)
ff:02.4 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 1 (rev 02)
ff:02.5 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 1 (rev 02)
ff:03.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Registers (rev 02)
ff:03.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Target Address Decoder (rev 02)
ff:03.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller RAS Registers (rev 02)
ff:03.4 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Test Registers (rev 02)
ff:04.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Control (rev 02)
ff:04.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Address (rev 02)
ff:04.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Rank (rev 02)
ff:04.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Thermal Control (rev 02)
ff:05.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Control (rev 02)
ff:05.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Address (rev 02)
ff:05.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Rank (rev 02)
ff:05.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Thermal Control (rev 02)
ff:06.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Control (rev 02)
ff:06.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Address (rev 02)
ff:06.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Rank (rev 02)
ff:06.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Thermal Control (rev 02)


The working system (Ubuntu 12.04 Precise):

rlaager@...KING:~$ uname -a
Linux WORKING 3.2.0-74-generic #109-Ubuntu SMP Tue Dec 9 16:45:49 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux

rlaager@...KING:~$ ethtool -k eth0
Offload parameters for eth0:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: on

rlaager@...KING:~$ ethtool -k bond0
Offload parameters for bond0:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: off

rlaager@...KING:~$ ethtool -k br7
Offload parameters for br7:
rx-checksumming: on
tx-checksumming: on
scatter-gather: off
tcp-segmentation-offload: off
udp-fragmentation-offload: off
generic-segmentation-offload: off
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: off
tx-vlan-offload: on
ntuple-filters: off




A stack trace from 3.13.0 (the default kernel in Ubuntu Trusty):

[ 1161.275007] WARNING: CPU: 7 PID: 0 at /build/buildd/linux-3.13.0/net/core/dev.c:2224 skb_warn_bad_offload+0xcd/0xda()
[ 1161.275011] : caps=(0x00000022000048c1, 0x0000000000000000) len=1514 data_len=1460 gso_size=1460 gso_type=1 ip_summed=1
[ 1161.275012] Modules linked in: nfsv3 ipmi_devintf ipmi_si vhost_net vhost macvtap macvlan bridge ip6t_REJECT xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_comment xt_mul
 mrp xt_addrtype llc bonding nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_
ch intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd serio_raw joydev i7core_eda
id nfs_acl lp parport nfs lockd sunrpc fscache ses enclosure raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor ixgbe raid6_pq dca hid_generic raid1 ptp mpt2sas
smouse hid libahci scsi_transport_sas mdio linear
[ 1161.275077] CPU: 7 PID: 0 Comm: swapper/7 Tainted: G        W     3.13.0-43-generic #72-Ubuntu
[ 1161.275079] Hardware name: Supermicro X8DT6/X8DT6, BIOS 2.0a    09/14/2010
[ 1161.275080]  0000000000000009 ffff880c3fc239d8 ffffffff81720bf6 ffff880c3fc23a20
[ 1161.275085]  ffff880c3fc23a10 ffffffff810677cd ffff880c1d3b9600 ffff880618e08000
[ 1161.275089]  0000000000000001 0000000000000001 ffff880c1d3b9600 ffff880c3fc23a70
[ 1161.275092] Call Trace:
[ 1161.275094]  <IRQ>  [<ffffffff81720bf6>] dump_stack+0x45/0x56
[ 1161.275101]  [<ffffffff810677cd>] warn_slowpath_common+0x7d/0xa0
[ 1161.275105]  [<ffffffff8106783c>] warn_slowpath_fmt+0x4c/0x50
[ 1161.275109]  [<ffffffff8136a0a3>] ? ___ratelimit+0x93/0x100
[ 1161.275113]  [<ffffffff81723afe>] skb_warn_bad_offload+0xcd/0xda
[ 1161.275118]  [<ffffffff81626489>] __skb_gso_segment+0x79/0xb0
[ 1161.275122]  [<ffffffff8162677a>] dev_hard_start_xmit+0x18a/0x560
[ 1161.275126]  [<ffffffff81098209>] ? ttwu_do_wakeup+0x19/0xc0
[ 1161.275129]  [<ffffffff8164594e>] sch_direct_xmit+0xee/0x1c0
[ 1161.275133]  [<ffffffff81626d80>] __dev_queue_xmit+0x230/0x500
[ 1161.275137]  [<ffffffff81627060>] dev_queue_xmit+0x10/0x20
[ 1161.275143]  [<ffffffffa04ab31b>] br_dev_queue_push_xmit+0x7b/0xc0 [bridge]
[ 1161.275149]  [<ffffffffa04ab532>] br_forward_finish+0x22/0x60 [bridge]
[ 1161.275155]  [<ffffffffa04ab710>] __br_forward+0x80/0xf0 [bridge]
[ 1161.275161]  [<ffffffffa04ab9bb>] br_forward+0x8b/0xa0 [bridge]
[ 1161.275167]  [<ffffffffa04ac6d9>] br_handle_frame_finish+0x149/0x3d0 [bridge]
[ 1161.275173]  [<ffffffffa04acad5>] br_handle_frame+0x175/0x250 [bridge]
[ 1161.275177]  [<ffffffff81624ac2>] __netif_receive_skb_core+0x262/0x840
[ 1161.275181]  [<ffffffff8101b700>] ? check_tsc_unstable+0x10/0x10
[ 1161.275184]  [<ffffffff816250b8>] __netif_receive_skb+0x18/0x60
[ 1161.275188]  [<ffffffff81625123>] netif_receive_skb+0x23/0x90
[ 1161.275192]  [<ffffffff81625b70>] napi_gro_receive+0x80/0xb0
[ 1161.275202]  [<ffffffffa014009c>] ixgbe_clean_rx_irq+0x7ac/0xb10 [ixgbe]
[ 1161.275211]  [<ffffffffa0141140>] ixgbe_poll+0x460/0x800 [ixgbe]
[ 1161.275216]  [<ffffffff816254a2>] net_rx_action+0x152/0x250
[ 1161.275220]  [<ffffffff8106cc1c>] __do_softirq+0xec/0x2c0
[ 1161.275223]  [<ffffffff8106d165>] irq_exit+0x105/0x110
[ 1161.275227]  [<ffffffff817339e6>] do_IRQ+0x56/0xc0
[ 1161.275231]  [<ffffffff817290ed>] common_interrupt+0x6d/0x6d
[ 1161.275232]  <EOI>  [<ffffffff815d361f>] ? cpuidle_enter_state+0x4f/0xc0
[ 1161.275240]  [<ffffffff815d3749>] cpuidle_idle_call+0xb9/0x1f0
[ 1161.275244]  [<ffffffff8101d35e>] arch_cpu_idle+0xe/0x30
[ 1161.275247]  [<ffffffff810bef35>] cpu_startup_entry+0xc5/0x290
[ 1161.275251]  [<ffffffff810413ed>] start_secondary+0x21d/0x2d0


A stack trace from 3.16.0 (still on Ubuntu Trusty):

[  120.376026] WARNING: CPU: 6 PID: 0 at /build/buildd/linux-lts-utopic-3.16.0/net/core/dev.c:2246 skb_warn_bad_offload+0xcd/0xda()
[  120.376029] : caps=(0x00000080000048c1, 0x0000000000000000) len=1514 data_len=1460 gso_size=1460 gso_type=1 ip_summed=1
[  120.376030] Modules linked in: nfsv3 ipmi_devintf ipmi_si ipmi_msghandler vhost_net vhost macvtap macvlan bridge 8021q garp stp mrp llc bonding ip6t_REJECT xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_comment xt_multiport xt_recent xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables intel_powerclamp coretemp kvm_intel gpio_ich kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd serio_raw lpc_ich joydev i7core_edac ioatdma edac_core nfsd auth_rpcgss mac_hid nfs_acl lp parport nfs lockd sunrpc fscache ses enclosure raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor hid_generic raid6_pq ixgbe usbhid raid1 mpt2sas dca ahci raid0 ptp raid_class pps_core scsi_transport_sas multipath hid mdio libahci linear
[  120.376085] CPU: 6 PID: 0 Comm: swapper/6 Not tainted 3.16.0-28-generic #37-Ubuntu
[  120.376086] Hardware name: Supermicro X8DT6/X8DT6, BIOS 2.0a    09/14/2010
[  120.376088]  0000000000000009 ffff880c3fc039b8 ffffffff81762220 ffff880c3fc03a00
[  120.376090]  ffff880c3fc039f0 ffffffff8106dd2d ffff880c1ac99a00 ffff88061c2fc000
[  120.376092]  0000000000000001 0000000000000001 ffff880c1ac99a00 ffff880c3fc03a50
[  120.376094] Call Trace:
[  120.376096]  <IRQ>  [<ffffffff81762220>] dump_stack+0x45/0x56
[  120.376105]  [<ffffffff8106dd2d>] warn_slowpath_common+0x7d/0xa0
[  120.376107]  [<ffffffff8106dd9c>] warn_slowpath_fmt+0x4c/0x50
[  120.376111]  [<ffffffff8138b153>] ? ___ratelimit+0x93/0x100
[  120.376114]  [<ffffffff817654da>] skb_warn_bad_offload+0xcd/0xda
[  120.376119]  [<ffffffff81661d29>] __skb_gso_segment+0x79/0xb0
[  120.376122]  [<ffffffff81662052>] dev_hard_start_xmit+0x182/0x5c0
[  120.376125]  [<ffffffff8168337e>] sch_direct_xmit+0xee/0x1c0
[  120.376127]  [<ffffffff81662690>] __dev_queue_xmit+0x200/0x4d0
[  120.376129]  [<ffffffff81662970>] dev_queue_xmit+0x10/0x20
[  120.376135]  [<ffffffffc0796ac8>] br_dev_queue_push_xmit+0x68/0xa0 [bridge]
[  120.376138]  [<ffffffffc0796cd2>] br_forward_finish+0x22/0x60 [bridge]
[  120.376142]  [<ffffffffc0796e90>] __br_forward+0x80/0xf0 [bridge]
[  120.376145]  [<ffffffffc079713b>] br_forward+0x8b/0xa0 [bridge]
[  120.376149]  [<ffffffffc0797fb9>] br_handle_frame_finish+0x139/0x3c0 [bridge]
[  120.376153]  [<ffffffffc079838e>] br_handle_frame+0x14e/0x240 [bridge]
[  120.376155]  [<ffffffff81660102>] __netif_receive_skb_core+0x1b2/0x790
[  120.376158]  [<ffffffff8101bcd9>] ? read_tsc+0x9/0x20
[  120.376161]  [<ffffffff816606f8>] __netif_receive_skb+0x18/0x60
[  120.376163]  [<ffffffff81660763>] netif_receive_skb_internal+0x23/0x90
[  120.376165]  [<ffffffff816612c0>] napi_gro_receive+0xc0/0xf0
[  120.376174]  [<ffffffffc03007ac>] ixgbe_clean_rx_irq+0x7bc/0xb40 [ixgbe]
[  120.376180]  [<ffffffffc03018a2>] ixgbe_poll+0x482/0x850 [ixgbe]
[  120.376183]  [<ffffffff8109e9e9>] ? ttwu_do_wakeup+0x19/0xc0
[  120.376186]  [<ffffffff81660b52>] net_rx_action+0x152/0x250
[  120.376189]  [<ffffffff81073055>] __do_softirq+0xf5/0x2e0
[  120.376191]  [<ffffffff81073515>] irq_exit+0x105/0x110
[  120.376194]  [<ffffffff8176d748>] do_IRQ+0x58/0xf0
[  120.376198]  [<ffffffff8176b5ed>] common_interrupt+0x6d/0x6d
[  120.376199]  <EOI>  [<ffffffff815fb83f>] ? cpuidle_enter_state+0x4f/0xc0
[  120.376204]  [<ffffffff815fb838>] ? cpuidle_enter_state+0x48/0xc0
[  120.376206]  [<ffffffff815fb967>] cpuidle_enter+0x17/0x20
[  120.376209]  [<ffffffff810b527d>] cpu_startup_entry+0x31d/0x450
[  120.376213]  [<ffffffff810e028d>] ? tick_check_new_device+0xdd/0xf0
[  120.376216]  [<ffffffff8104520d>] start_secondary+0x21d/0x2e0
[  120.376217] ---[ end trace 90d53a2c9c47f360 ]---

-- 
Richard

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