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[Bug 1388118] Re: linux-lts-utopic-3.16 spamming dmesg with warnings every few seconds in skb_warn_bad_offload

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Andy Whitcroft <apw@xxxxxxxxxxxxx>
Date: Fri, 31 Oct 2014 16:41:05 -0000
Reply-to: Bug 1388118 <1388118@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
This looks to be fixed by the commit below (which has been tested and
confirmed by @Stephane:

  commit db115037bb57cdfe97078b13da762213f7980e81
  Author: Michal Kubeček <mkubecek@xxxxxxx>
  Date:   Mon Aug 25 15:16:22 2014 +0200

    net: fix checksum features handling in netif_skb_features()

This fix is already applied to this branch parent via upstream stable.

** Also affects: linux-lts-utopic (Ubuntu)
   Importance: Undecided
       Status: New

** Package changed: linux-lts-utopic (Ubuntu) => linux-lts-trusty
(Ubuntu)

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-trusty (Ubuntu Trusty)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1388118

Title:
  linux-lts-utopic-3.16 spamming dmesg with warnings every few seconds
  in skb_warn_bad_offload

Status in “linux” package in Ubuntu:
  Incomplete
Status in “linux-lts-trusty” package in Ubuntu:
  Invalid
Status in “linux” source package in Trusty:
  Invalid
Status in “linux-lts-trusty” source package in Trusty:
  New

Bug description:
  So I just updated my home server to the 3.16 from the kernel team PPA
  (3.16.0-23-generic #31-Ubuntu) and I'm now getting a ton of warnings
  related to what looks like some kind of network hardware offloading.

  A 10 minutes kernel.log sample is attached.

  The server is a recent SuperMicro machine with two 6 cores Xeon
  E5-2620.

  lspci:
  00:00.0 Host bridge [0600]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 DMI2 [8086:0e00] (rev 04)
  00:01.0 PCI bridge [0604]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 1a [8086:0e02] (rev 04)
  00:01.1 PCI bridge [0604]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 1b [8086:0e03] (rev 04)
  00:02.0 PCI bridge [0604]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 2a [8086:0e04] (rev 04)
  00:03.0 PCI bridge [0604]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 3a [8086:0e08] (rev 04)
  00:03.2 PCI bridge [0604]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 3c [8086:0e0a] (rev 04)
  00:04.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 0 [8086:0e20] (rev 04)
  00:04.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 1 [8086:0e21] (rev 04)
  00:04.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 2 [8086:0e22] (rev 04)
  00:04.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 3 [8086:0e23] (rev 04)
  00:04.4 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 4 [8086:0e24] (rev 04)
  00:04.5 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 5 [8086:0e25] (rev 04)
  00:04.6 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 6 [8086:0e26] (rev 04)
  00:04.7 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 7 [8086:0e27] (rev 04)
  00:05.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 VTd/Memory Map/Misc [8086:0e28] (rev 04)
  00:05.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 IIO RAS [8086:0e2a] (rev 04)
  00:05.4 PIC [0800]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 IOAPIC [8086:0e2c] (rev 04)
  00:11.0 PCI bridge [0604]: Intel Corporation C600/X79 series chipset PCI Express Virtual Root Port [8086:1d3e] (rev 06)
  00:16.0 Communication controller [0780]: Intel Corporation C600/X79 series chipset MEI Controller #1 [8086:1d3a] (rev 05)
  00:16.1 Communication controller [0780]: Intel Corporation C600/X79 series chipset MEI Controller #2 [8086:1d3b] (rev 05)
  00:1a.0 USB controller [0c03]: Intel Corporation C600/X79 series chipset USB2 Enhanced Host Controller #2 [8086:1d2d] (rev 06)
  00:1d.0 USB controller [0c03]: Intel Corporation C600/X79 series chipset USB2 Enhanced Host Controller #1 [8086:1d26] (rev 06)
  00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge [8086:244e] (rev a6)
  00:1f.0 ISA bridge [0601]: Intel Corporation C600/X79 series chipset LPC Controller [8086:1d41] (rev 06)
  00:1f.2 SATA controller [0106]: Intel Corporation C600/X79 series chipset 6-Port SATA AHCI Controller [8086:1d02] (rev 06)
  00:1f.3 SMBus [0c05]: Intel Corporation C600/X79 series chipset SMBus Host Controller [8086:1d22] (rev 06)
  00:1f.6 Signal processing controller [1180]: Intel Corporation C600/X79 series chipset Thermal Management Controller [8086:1d24] (rev 06)
  02:00.0 Ethernet controller [0200]: Intel Corporation I350 Gigabit Network Connection [8086:1521] (rev 01)
  02:00.1 Ethernet controller [0200]: Intel Corporation I350 Gigabit Network Connection [8086:1521] (rev 01)
  06:00.0 RAID bus controller [0104]: Marvell Technology Group Ltd. 88SE9485 SAS/SATA 6Gb/s controller [1b4b:9485] (rev c3)
  08:03.0 VGA compatible controller [0300]: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 [102b:0532] (rev 0a)
  7f:08.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 QPI Link 0 [8086:0e80] (rev 04)
  7f:09.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 QPI Link 1 [8086:0e90] (rev 04)
  7f:0a.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Power Control Unit 0 [8086:0ec0] (rev 04)
  7f:0a.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Power Control Unit 1 [8086:0ec1] (rev 04)
  7f:0a.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Power Control Unit 2 [8086:0ec2] (rev 04)
  7f:0a.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Power Control Unit 3 [8086:0ec3] (rev 04)
  7f:0b.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 UBOX Registers [8086:0e1e] (rev 04)
  7f:0b.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 UBOX Registers [8086:0e1f] (rev 04)
  7f:0c.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee0] (rev 04)
  7f:0c.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee2] (rev 04)
  7f:0c.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee4] (rev 04)
  7f:0d.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee1] (rev 04)
  7f:0d.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee3] (rev 04)
  7f:0d.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee5] (rev 04)
  7f:0e.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Home Agent 0 [8086:0ea0] (rev 04)
  7f:0e.1 Performance counters [1101]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Home Agent 0 [8086:0e30] (rev 04)
  7f:0f.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Target Address/Thermal Registers [8086:0ea8] (rev 04)
  7f:0f.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 RAS Registers [8086:0e71] (rev 04)
  7f:0f.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers [808... (rev 04)
  7f:0f.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers [808... (rev 04)
  7f:0f.4 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers [808... (rev 04)
  7f:0f.5 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers [808... (rev 04)
  7f:10.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 0 [8086:0eb0] (rev 04)
  7f:10.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 1 [8086:0eb1] (rev 04)
  7f:10.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 0 [8086:0eb2] (rev 04)
  7f:10.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 1 [8086:0eb3] (rev 04)
  7f:10.4 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 2 [8086:0eb4] (rev 04)
  7f:10.5 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 3 [8086:0eb5] (rev 04)
  7f:10.6 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 2 [8086:0eb6] (rev 04)
  7f:10.7 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 3 [8086:0eb7] (rev 04)
  7f:13.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 R2PCIe [8086:0e1d] (rev 04)
  7f:13.1 Performance counters [1101]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 R2PCIe [8086:0e34] (rev 04)
  7f:13.4 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 QPI Ring Registers [8086:0e81] (rev 04)
  7f:13.5 Performance counters [1101]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 QPI Ring Performance Ring Monitoring [8086:0e36] (rev 04)
  7f:16.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 System Address Decoder [8086:0ec8] (rev 04)
  7f:16.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Broadcast Registers [8086:0ec9] (rev 04)
  7f:16.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Broadcast Registers [8086:0eca] (rev 04)
  80:01.0 PCI bridge [0604]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 1a [8086:0e02] (rev 04)
  80:02.0 PCI bridge [0604]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 2a [8086:0e04] (rev 04)
  80:03.0 PCI bridge [0604]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 3a [8086:0e08] (rev 04)
  80:04.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 0 [8086:0e20] (rev 04)
  80:04.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 1 [8086:0e21] (rev 04)
  80:04.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 2 [8086:0e22] (rev 04)
  80:04.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 3 [8086:0e23] (rev 04)
  80:04.4 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 4 [8086:0e24] (rev 04)
  80:04.5 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 5 [8086:0e25] (rev 04)
  80:04.6 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 6 [8086:0e26] (rev 04)
  80:04.7 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Crystal Beach DMA Channel 7 [8086:0e27] (rev 04)
  80:05.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 VTd/Memory Map/Misc [8086:0e28] (rev 04)
  80:05.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 IIO RAS [8086:0e2a] (rev 04)
  80:05.4 PIC [0800]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 IOAPIC [8086:0e2c] (rev 04)
  ff:08.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 QPI Link 0 [8086:0e80] (rev 04)
  ff:09.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 QPI Link 1 [8086:0e90] (rev 04)
  ff:0a.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Power Control Unit 0 [8086:0ec0] (rev 04)
  ff:0a.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Power Control Unit 1 [8086:0ec1] (rev 04)
  ff:0a.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Power Control Unit 2 [8086:0ec2] (rev 04)
  ff:0a.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Power Control Unit 3 [8086:0ec3] (rev 04)
  ff:0b.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 UBOX Registers [8086:0e1e] (rev 04)
  ff:0b.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 UBOX Registers [8086:0e1f] (rev 04)
  ff:0c.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee0] (rev 04)
  ff:0c.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee2] (rev 04)
  ff:0c.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee4] (rev 04)
  ff:0d.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee1] (rev 04)
  ff:0d.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee3] (rev 04)
  ff:0d.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Unicast Registers [8086:0ee5] (rev 04)
  ff:0e.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Home Agent 0 [8086:0ea0] (rev 04)
  ff:0e.1 Performance counters [1101]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Home Agent 0 [8086:0e30] (rev 04)
  ff:0f.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Target Address/Thermal Registers [8086:0ea8] (rev 04)
  ff:0f.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 RAS Registers [8086:0e71] (rev 04)
  ff:0f.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers [808... (rev 04)
  ff:0f.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers [808... (rev 04)
  ff:0f.4 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers [808... (rev 04)
  ff:0f.5 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers [808... (rev 04)
  ff:10.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 0 [8086:0eb0] (rev 04)
  ff:10.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 1 [8086:0eb1] (rev 04)
  ff:10.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 0 [8086:0eb2] (rev 04)
  ff:10.3 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 1 [8086:0eb3] (rev 04)
  ff:10.4 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 2 [8086:0eb4] (rev 04)
  ff:10.5 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 3 [8086:0eb5] (rev 04)
  ff:10.6 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 2 [8086:0eb6] (rev 04)
  ff:10.7 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 3 [8086:0eb7] (rev 04)
  ff:13.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 R2PCIe [8086:0e1d] (rev 04)
  ff:13.1 Performance counters [1101]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 R2PCIe [8086:0e34] (rev 04)
  ff:13.4 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 QPI Ring Registers [8086:0e81] (rev 04)
  ff:13.5 Performance counters [1101]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 QPI Ring Performance Ring Monitoring [8086:0e36] (rev 04)
  ff:16.0 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 System Address Decoder [8086:0ec8] (rev 04)
  ff:16.1 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Broadcast Registers [8086:0ec9] (rev 04)
  ff:16.2 System peripheral [0880]: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Broadcast Registers [8086:0eca] (rev 04)

  
  ===

  break-fix: db115037bb57cdfe97078b13da762213f7980e81
  db115037bb57cdfe97078b13da762213f7980e81

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References

[Bug 1388118] [NEW] linux-lts-utopic-3.16 spamming dmesg with warnings every few seconds in skb_warn_bad_offload
From: Stéphane Graber, 2014-10-31