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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I built a Xenial test kernel from master-next.  The kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1558025/

Can you test this kernel and see if it resolves this bug?

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https://bugs.launchpad.net/bugs/1558025

Title:
  skb_warn_bad_offload Crash

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress

Bug description:
  We're setting up a new Dovecot server on Xenial. When we start the
  migration of emails, either the IMAP traffic or the NFS traffic
  immediately reproduces the crash below.

  I bisected using the mainline kernels. Everything up to and including
  v4.5-rc7-wily fails, but v4.5-wily works.

  [35439.677840] WARNING: CPU: 1 PID: 1209 at /build/linux-chsvUo/linux-4.4.0/net/core/dev.c:2422 skb_warn_bad_offload+0xd1/0x120()
  [35439.677843] virtio_net: caps=(0x00000804001f4a29, 0x0000000000000000) len=1622 data_len=1452 gso_size=1480 gso_type=2 ip_summed=0
  [35439.677844] Modules linked in: nfsv3 nfs_acl nfs lockd grace fscache ppdev kvm_intel kvm irqbypass input_leds joydev serio_raw pvpanic parport_pc 8250_fintek par
  v6 xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 xt_comment xt_multiport xt_recent xt_limit ib_iser xt_tcpudp rdma_cm iw_cm xt_addrtype i
  ipv4 nf_defrag_ipv4 iscsi_tcp xt_conntrack libiscsi_tcp libiscsi scsi_transport_iscsi ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_n
  able_filter ip_tables x_tables sunrpc autofs4 cirrus ttm drm_kms_helper syscopyarea sysfillrect psmouse sysimgblt fb_sys_fops floppy drm pata_acpi
  [35439.677893] CPU: 1 PID: 1209 Comm: kworker/1:1H Tainted: G        W       4.4.0-12-generic #28-Ubuntu
  [35439.677895] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
  [35439.677920] Workqueue: rpciod rpc_async_schedule [sunrpc]
  [35439.677922]  0000000000000286 00000000989a4fbd ffff880038c13798 ffffffff813e1ec3
  [35439.677924]  ffff880038c137e0 ffffffff81d5f900 ffff880038c137d0 ffffffff8107fe12
  [35439.677926]  ffff8800382f2600 ffff880035cdb000 0000000000000002 ffff880038264aac
  [35439.677928] Call Trace:
  [35439.677934]  [<ffffffff813e1ec3>] dump_stack+0x63/0x90
  [35439.677938]  [<ffffffff8107fe12>] warn_slowpath_common+0x82/0xc0
  [35439.677940]  [<ffffffff8107feac>] warn_slowpath_fmt+0x5c/0x80
  [35439.677943]  [<ffffffff813e7f32>] ? ___ratelimit+0xa2/0xe0
  [35439.677946]  [<ffffffff81711011>] skb_warn_bad_offload+0xd1/0x120
  [35439.677948]  [<ffffffff8171469e>] __skb_gso_segment+0x7e/0xd0
  [35439.677950]  [<ffffffff81714a4d>] validate_xmit_skb.isra.97.part.98+0x10d/0x2b0
  [35439.677951]  [<ffffffff81714ffb>] validate_xmit_skb_list+0x3b/0x60
  [35439.677956]  [<ffffffff817397eb>] sch_direct_xmit+0x16b/0x210
  [35439.677957]  [<ffffffff8171533d>] __dev_queue_xmit+0x23d/0x590
  [35439.677959]  [<ffffffff817156a0>] dev_queue_xmit+0x10/0x20
  [35439.677962]  [<ffffffff8171e098>] neigh_resolve_output+0x118/0x1c0
  [35439.677966]  [<ffffffff817553b6>] ip_finish_output2+0x146/0x340
  [35439.677968]  [<ffffffff81756316>] ip_finish_output+0x136/0x1f0
  [35439.677971]  [<ffffffff81749b93>] ? nf_hook_slow+0x73/0xd0
  [35439.677973]  [<ffffffff81756d0e>] ip_output+0x6e/0xe0
  [35439.677975]  [<ffffffff817561e0>] ? __ip_flush_pending_frames.isra.39+0x90/0x90
  [35439.677977]  [<ffffffff817564d5>] ip_local_out+0x35/0x40
  [35439.677979]  [<ffffffff817576b9>] ip_send_skb+0x19/0x40
  [35439.677981]  [<ffffffff8177ed26>] udp_send_skb+0x176/0x270
  [35439.677983]  [<ffffffff8177ee5e>] udp_push_pending_frames+0x3e/0x60
  [35439.677985]  [<ffffffff81780581>] udp_sendpage+0x121/0x1a0
  [35439.677990]  [<ffffffff816f6458>] ? sock_sendmsg+0x38/0x50
  [35439.677992]  [<ffffffff816f658b>] ? kernel_sendmsg+0x2b/0x30
  [35439.678001]  [<ffffffffc0131625>] ? xs_send_kvec+0xa5/0xb0 [sunrpc]
  [35439.678004]  [<ffffffff8178d133>] inet_sendpage+0x73/0xd0
  [35439.678013]  [<ffffffffc01317b9>] xs_sendpages+0x189/0x1d0 [sunrpc]
  [35439.678022]  [<ffffffffc0131acb>] xs_udp_send_request+0x7b/0x1b0 [sunrpc]
  [35439.678031]  [<ffffffffc012f616>] xprt_transmit+0x66/0x340 [sunrpc]
  [35439.678039]  [<ffffffffc012bd89>] call_transmit+0x1b9/0x2a0 [sunrpc]
  [35439.678047]  [<ffffffffc012bbd0>] ? call_decode+0x800/0x800 [sunrpc]
  [35439.678055]  [<ffffffffc012bbd0>] ? call_decode+0x800/0x800 [sunrpc]
  [35439.678065]  [<ffffffffc0136461>] __rpc_execute+0x91/0x470 [sunrpc]
  [35439.678074]  [<ffffffffc0136855>] rpc_async_schedule+0x15/0x20 [sunrpc]
  [35439.678078]  [<ffffffff81098eb2>] process_one_work+0x162/0x480
  [35439.678080]  [<ffffffff8109921b>] worker_thread+0x4b/0x4c0
  [35439.678082]  [<ffffffff810991d0>] ? process_one_work+0x480/0x480
  [35439.678084]  [<ffffffff810991d0>] ? process_one_work+0x480/0x480
  [35439.678086]  [<ffffffff8109f3e8>] kthread+0xd8/0xf0
  [35439.678088]  [<ffffffff8109f310>] ? kthread_create_on_node+0x1e0/0x1e0
  [35439.678091]  [<ffffffff8181cbcf>] ret_from_fork+0x3f/0x70
  [35439.678093]  [<ffffffff8109f310>] ? kthread_create_on_node+0x1e0/0x1e0
  [35439.678094] ---[ end trace f958a4523480bfd6 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-12-generic 4.4.0-12.28
  ProcVersionSignature: Ubuntu 4.4.0-12.28-generic 4.4.4
  Uname: Linux 4.4.0-12-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mar 16 06:04 seq
   crw-rw---- 1 root audio 116, 33 Mar 16 06:04 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Wed Mar 16 06:04:42 2016
  HibernationDevice: RESUME=UUID=5bd13db0-5643-4ab4-9755-6f699d2bb5e5
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-12-generic root=UUID=b7f56990-c269-4bc6-872c-7d7982f384bf ro console=ttyS0,115200n8 console=tty1 transparent_hugepage=always elevator=noop
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-12-generic N/A
   linux-backports-modules-4.4.0-12-generic  N/A
   linux-firmware                            1.156
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/01/2011
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-trusty:cvnBochs:ct1:cvr:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-trusty
  dmi.sys.vendor: QEMU

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