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[Bug 1404374] [NEW] Apparently ipv6-related crash in Linux version 3.13.0-43-generic (buildd@tipua) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu 1) ) #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 (Ubuntu 3.13.0-43.72-generic 3.13.11.11)

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Stephen Frost <sfrost@xxxxxxxxxxx>
Date: Fri, 19 Dec 2014 20:42:59 -0000
Reply-to: Bug 1404374 <1404374@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

I'm on OFTC and Freenode as Snow-Man if folks want to chat further or if
there's anything I can run with 'crash' to provide additional
information.

This is a KVM guest running under a physical box which is running the
same kernel (43.72)

I've downgraded the KVM guest to Linux tamriel 3.13.0-40-generic
#69-Ubuntu SMP Thu Nov 13 17:53:56 UTC 2014 x86_64 x86_64 x86_64
GNU/Linux; hopefully this will be stable but I'll report back if it's
not.  Other guests are running the 43.72 kernel and have not crashed,
but most are single-cpu while the guest which is crashing is 4-cpu.

I have crash installed and a dump file.  Here is the dmesg output from
the crash:

[   15.407890] general protection fault: 0000 [#1] SMP 
[   15.411159] Modules linked in: ttm drm_kms_helper kvm_amd drm kvm syscopyarea sysfillrect sysimgblt i2c_piix4 serio_raw lp mac_hid parport psmouse floppy virtio_scsi
[   15.411159] CPU: 3 PID: 2398 Comm: smtp Not tainted 3.13.0-43-generic #72-Ubuntu
[   15.411159] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.411159] task: ffff8800d8776000 ti: ffff880036a14000 task.ti: ffff880036a14000
[   15.411159] RIP: 0010:[<ffffffff816c0eb2>]  [<ffffffff816c0eb2>] ip6_xmit+0x1a2/0x410
[   15.411159] RSP: 0018:ffff880036a15b18  EFLAGS: 00010286
[   15.411159] RAX: 5709000000000000 RBX: ffff8800dbbb94e8 RCX: 0000000000010000
[   15.411159] RDX: ffffffff8189cc00 RSI: 0000000000000028 RDI: ffff8800d96126c0
[   15.411159] RBP: ffff880036a15b78 R08: 0000000000000000 R09: 00000000000165d6
[   15.411159] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800d9bfa6c0
[   15.411159] R13: ffff8800d96126c0 R14: 0000000000000060 R15: ffff880036a15b90
[   15.411159] FS:  00007f02749c3740(0000) GS:ffff88011fd80000(0000) knlGS:0000000000000000
[   15.411159] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.411159] CR2: 00007f027620d048 CR3: 00000000da851000 CR4: 00000000000006e0
[   15.428200] Stack:
[   15.428200]  ffff880036a15b78 ffffffff816f0ac8 ffff8800d8ea18e8 0000000000000adc
[   15.430445]  ffffffff81cda780 06ff880036a15fd8 ffff880036a15ba4 ffff8800d9bfa6c0
[   15.430673]  ffff8800dbbb94e8 ffff8800d9bfada0 0000000000000020 ffff8800d96126c0
[   15.433514] Call Trace:
[   15.433514]  [<ffffffff816f0ac8>] ? inet6_csk_route_socket+0x128/0x200
[   15.433514]  [<ffffffff816f0c9d>] inet6_csk_xmit+0x7d/0xd0
[   15.433514]  [<ffffffff81677519>] tcp_transmit_skb+0x469/0x8d0
[   15.433514]  [<ffffffff81677ac0>] tcp_write_xmit+0x140/0xb10
[   15.433514]  [<ffffffff81676bc4>] ? tcp_current_mss+0x54/0x80
[   15.433514]  [<ffffffff816787c0>] tcp_push_one+0x30/0x40
[   15.433514]  [<ffffffff8166a101>] tcp_sendmsg+0x4e1/0xdb0
[   15.433514]  [<ffffffff81693624>] inet_sendmsg+0x64/0xb0
[   15.433514]  [<ffffffff813137f7>] ? apparmor_socket_sendmsg+0x17/0x20
[   15.433514]  [<ffffffff8160b63e>] sock_aio_write+0xfe/0x130
[   15.433514]  [<ffffffff811bd4ba>] do_sync_write+0x5a/0x90
[   15.433514]  [<ffffffff811bdd3d>] vfs_write+0x1ad/0x1f0
[   15.433514]  [<ffffffff811be679>] SyS_write+0x49/0xa0
[   15.433514]  [<ffffffff811d3125>] ? SyS_poll+0x65/0x100
[   15.433514]  [<ffffffff817316ad>] system_call_fastpath+0x1a/0x1f
[   15.433514] Code: 49 8b 45 20 ff 50 20 39 43 68 77 6d 48 8b 43 58 48 83 e0 fe 48 8b 80 48 01 00 00 48 85 c0 0f 84 51 02 00 00 48 8b 80 68 02 00 00 <65> 48 ff 40 28 8b 53 68 65 48 01 50 30 48 8b 44 24 20 48 8b 80 
[   15.433514] RIP  [<ffffffff816c0eb2>] ip6_xmit+0x1a2/0x410
[   15.433514]  RSP <ffff880036a15b18>

Here's it the output from crash:

      KERNEL: /usr/lib/debug/boot/vmlinux-3.13.0-43-generic
    DUMPFILE: /var/crash/201412191519/dump.201412191519  [PARTIAL DUMP]
        CPUS: 4
        DATE: Fri Dec 19 15:19:18 2014
      UPTIME: 00:00:15
LOAD AVERAGE: 0.58, 0.13, 0.04
       TASKS: 229
    NODENAME: tamriel
     RELEASE: 3.13.0-43-generic
     VERSION: #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014
     MACHINE: x86_64  (2700 Mhz)
      MEMORY: 4 GB
       PANIC: ""
         PID: 2398
     COMMAND: "smtp"
        TASK: ffff8800d8776000  [THREAD_INFO: ffff880036a14000]
         CPU: 3
       STATE: TASK_RUNNING (PANIC)

Probably not really interesting, but here's the lspci -vnvn output:

00:00.0 Host bridge [0600]: Intel Corporation 440FX - 82441FX PMC [Natoma] [8086:1237] (rev 02)
        Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.0 ISA bridge [0601]: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] [8086:7000]
        Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
        Physical Slot: 1
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.1 IDE interface [0101]: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] [8086:7010] (prog-if 80 [Master])
        Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
        Physical Slot: 1
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
        Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable)
        Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
        Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable)
        Region 4: I/O ports at c0a0 [size=16]
        Kernel driver in use: ata_piix

00:01.2 USB controller [0c03]: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] [8086:7020] (rev 01) (prog-if 00 [UHCI])
        Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
        Physical Slot: 1
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin D routed to IRQ 11
        Region 4: I/O ports at c040 [size=32]
        Kernel driver in use: uhci_hcd

00:01.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 03)
        Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
        Physical Slot: 1
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Interrupt: pin A routed to IRQ 9
        Kernel driver in use: piix4_smbus

00:02.0 VGA compatible controller [0300]: Cirrus Logic GD 5446 [1013:00b8] (prog-if 00 [VGA controller])
        Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
        Physical Slot: 2
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Region 0: Memory at fc000000 (32-bit, prefetchable) [size=32M]
        Region 1: Memory at febf0000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at febe0000 [disabled] [size=64K]

00:03.0 Ethernet controller [0200]: Red Hat, Inc Virtio network device [1af4:1000]
        Subsystem: Red Hat, Inc Device [1af4:0001]
        Physical Slot: 3
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 10
        Region 0: I/O ports at c060 [size=32]
        Region 1: Memory at febf1000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at febc0000 [disabled] [size=128K]
        Capabilities: [40] MSI-X: Enable+ Count=3 Masked-
                Vector table: BAR=1 offset=00000000
                PBA: BAR=1 offset=00000800
        Kernel driver in use: virtio-pci

00:04.0 SCSI storage controller [0100]: Red Hat, Inc Virtio SCSI [1af4:1004]
        Subsystem: Red Hat, Inc Device [1af4:0008]
        Physical Slot: 4
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 11
        Region 0: I/O ports at c000 [size=64]
        Region 1: Memory at febf2000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [40] MSI-X: Enable+ Count=4 Masked-
                Vector table: BAR=1 offset=00000000
                PBA: BAR=1 offset=00000800
        Kernel driver in use: virtio-pci

00:06.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon [1af4:1002]
        Subsystem: Red Hat, Inc Device [1af4:0005]
        Physical Slot: 6
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 10
        Region 0: I/O ports at c080 [size=32]
        Kernel driver in use: virtio-pci

root@tamriel:/var/crash/201412191519# lspci -vnvn
00:00.0 Host bridge [0600]: Intel Corporation 440FX - 82441FX PMC [Natoma] [8086:1237] (rev 02)
        Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.0 ISA bridge [0601]: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] [8086:7000]
        Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
        Physical Slot: 1
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.1 IDE interface [0101]: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] [8086:7010] (prog-if 80 [Master])
        Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
        Physical Slot: 1
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
        Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable)
        Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
        Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable)
        Region 4: I/O ports at c0a0 [size=16]
        Kernel driver in use: ata_piix

00:01.2 USB controller [0c03]: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] [8086:7020] (rev 01) (prog-if 00 [UHCI])
        Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
        Physical Slot: 1
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin D routed to IRQ 11
        Region 4: I/O ports at c040 [size=32]
        Kernel driver in use: uhci_hcd

00:01.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 03)
        Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
        Physical Slot: 1
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Interrupt: pin A routed to IRQ 9
        Kernel driver in use: piix4_smbus

00:02.0 VGA compatible controller [0300]: Cirrus Logic GD 5446 [1013:00b8] (prog-if 00 [VGA controller])
        Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
        Physical Slot: 2
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Region 0: Memory at fc000000 (32-bit, prefetchable) [size=32M]
        Region 1: Memory at febf0000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at febe0000 [disabled] [size=64K]

00:03.0 Ethernet controller [0200]: Red Hat, Inc Virtio network device [1af4:1000]
        Subsystem: Red Hat, Inc Device [1af4:0001]
        Physical Slot: 3
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 10
        Region 0: I/O ports at c060 [size=32]
        Region 1: Memory at febf1000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at febc0000 [disabled] [size=128K]
        Capabilities: [40] MSI-X: Enable+ Count=3 Masked-
                Vector table: BAR=1 offset=00000000
                PBA: BAR=1 offset=00000800
        Kernel driver in use: virtio-pci

00:04.0 SCSI storage controller [0100]: Red Hat, Inc Virtio SCSI [1af4:1004]
        Subsystem: Red Hat, Inc Device [1af4:0008]
        Physical Slot: 4
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 11
        Region 0: I/O ports at c000 [size=64]
        Region 1: Memory at febf2000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [40] MSI-X: Enable+ Count=4 Masked-
                Vector table: BAR=1 offset=00000000
                PBA: BAR=1 offset=00000800
        Kernel driver in use: virtio-pci

00:06.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon [1af4:1002]
        Subsystem: Red Hat, Inc Device [1af4:0005]
        Physical Slot: 6
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 10
        Region 0: I/O ports at c080 [size=32]
        Kernel driver in use: virtio-pci

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1404374

Title:
  Apparently ipv6-related crash in Linux version 3.13.0-43-generic
  (buildd@tipua) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu 1) )
  #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 (Ubuntu
  3.13.0-43.72-generic 3.13.11.11)

Status in linux package in Ubuntu:
  New

Bug description:
  I'm on OFTC and Freenode as Snow-Man if folks want to chat further or
  if there's anything I can run with 'crash' to provide additional
  information.

  This is a KVM guest running under a physical box which is running the
  same kernel (43.72)

  I've downgraded the KVM guest to Linux tamriel 3.13.0-40-generic
  #69-Ubuntu SMP Thu Nov 13 17:53:56 UTC 2014 x86_64 x86_64 x86_64
  GNU/Linux; hopefully this will be stable but I'll report back if it's
  not.  Other guests are running the 43.72 kernel and have not crashed,
  but most are single-cpu while the guest which is crashing is 4-cpu.

  I have crash installed and a dump file.  Here is the dmesg output from
  the crash:

  [   15.407890] general protection fault: 0000 [#1] SMP 
  [   15.411159] Modules linked in: ttm drm_kms_helper kvm_amd drm kvm syscopyarea sysfillrect sysimgblt i2c_piix4 serio_raw lp mac_hid parport psmouse floppy virtio_scsi
  [   15.411159] CPU: 3 PID: 2398 Comm: smtp Not tainted 3.13.0-43-generic #72-Ubuntu
  [   15.411159] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
  [   15.411159] task: ffff8800d8776000 ti: ffff880036a14000 task.ti: ffff880036a14000
  [   15.411159] RIP: 0010:[<ffffffff816c0eb2>]  [<ffffffff816c0eb2>] ip6_xmit+0x1a2/0x410
  [   15.411159] RSP: 0018:ffff880036a15b18  EFLAGS: 00010286
  [   15.411159] RAX: 5709000000000000 RBX: ffff8800dbbb94e8 RCX: 0000000000010000
  [   15.411159] RDX: ffffffff8189cc00 RSI: 0000000000000028 RDI: ffff8800d96126c0
  [   15.411159] RBP: ffff880036a15b78 R08: 0000000000000000 R09: 00000000000165d6
  [   15.411159] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800d9bfa6c0
  [   15.411159] R13: ffff8800d96126c0 R14: 0000000000000060 R15: ffff880036a15b90
  [   15.411159] FS:  00007f02749c3740(0000) GS:ffff88011fd80000(0000) knlGS:0000000000000000
  [   15.411159] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   15.411159] CR2: 00007f027620d048 CR3: 00000000da851000 CR4: 00000000000006e0
  [   15.428200] Stack:
  [   15.428200]  ffff880036a15b78 ffffffff816f0ac8 ffff8800d8ea18e8 0000000000000adc
  [   15.430445]  ffffffff81cda780 06ff880036a15fd8 ffff880036a15ba4 ffff8800d9bfa6c0
  [   15.430673]  ffff8800dbbb94e8 ffff8800d9bfada0 0000000000000020 ffff8800d96126c0
  [   15.433514] Call Trace:
  [   15.433514]  [<ffffffff816f0ac8>] ? inet6_csk_route_socket+0x128/0x200
  [   15.433514]  [<ffffffff816f0c9d>] inet6_csk_xmit+0x7d/0xd0
  [   15.433514]  [<ffffffff81677519>] tcp_transmit_skb+0x469/0x8d0
  [   15.433514]  [<ffffffff81677ac0>] tcp_write_xmit+0x140/0xb10
  [   15.433514]  [<ffffffff81676bc4>] ? tcp_current_mss+0x54/0x80
  [   15.433514]  [<ffffffff816787c0>] tcp_push_one+0x30/0x40
  [   15.433514]  [<ffffffff8166a101>] tcp_sendmsg+0x4e1/0xdb0
  [   15.433514]  [<ffffffff81693624>] inet_sendmsg+0x64/0xb0
  [   15.433514]  [<ffffffff813137f7>] ? apparmor_socket_sendmsg+0x17/0x20
  [   15.433514]  [<ffffffff8160b63e>] sock_aio_write+0xfe/0x130
  [   15.433514]  [<ffffffff811bd4ba>] do_sync_write+0x5a/0x90
  [   15.433514]  [<ffffffff811bdd3d>] vfs_write+0x1ad/0x1f0
  [   15.433514]  [<ffffffff811be679>] SyS_write+0x49/0xa0
  [   15.433514]  [<ffffffff811d3125>] ? SyS_poll+0x65/0x100
  [   15.433514]  [<ffffffff817316ad>] system_call_fastpath+0x1a/0x1f
  [   15.433514] Code: 49 8b 45 20 ff 50 20 39 43 68 77 6d 48 8b 43 58 48 83 e0 fe 48 8b 80 48 01 00 00 48 85 c0 0f 84 51 02 00 00 48 8b 80 68 02 00 00 <65> 48 ff 40 28 8b 53 68 65 48 01 50 30 48 8b 44 24 20 48 8b 80 
  [   15.433514] RIP  [<ffffffff816c0eb2>] ip6_xmit+0x1a2/0x410
  [   15.433514]  RSP <ffff880036a15b18>

  Here's it the output from crash:

        KERNEL: /usr/lib/debug/boot/vmlinux-3.13.0-43-generic
      DUMPFILE: /var/crash/201412191519/dump.201412191519  [PARTIAL DUMP]
          CPUS: 4
          DATE: Fri Dec 19 15:19:18 2014
        UPTIME: 00:00:15
  LOAD AVERAGE: 0.58, 0.13, 0.04
         TASKS: 229
      NODENAME: tamriel
       RELEASE: 3.13.0-43-generic
       VERSION: #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014
       MACHINE: x86_64  (2700 Mhz)
        MEMORY: 4 GB
         PANIC: ""
           PID: 2398
       COMMAND: "smtp"
          TASK: ffff8800d8776000  [THREAD_INFO: ffff880036a14000]
           CPU: 3
         STATE: TASK_RUNNING (PANIC)

  Probably not really interesting, but here's the lspci -vnvn output:

  00:00.0 Host bridge [0600]: Intel Corporation 440FX - 82441FX PMC [Natoma] [8086:1237] (rev 02)
          Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
          Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

  00:01.0 ISA bridge [0601]: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] [8086:7000]
          Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
          Physical Slot: 1
          Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

  00:01.1 IDE interface [0101]: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] [8086:7010] (prog-if 80 [Master])
          Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
          Physical Slot: 1
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
          Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable)
          Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
          Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable)
          Region 4: I/O ports at c0a0 [size=16]
          Kernel driver in use: ata_piix

  00:01.2 USB controller [0c03]: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] [8086:7020] (rev 01) (prog-if 00 [UHCI])
          Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
          Physical Slot: 1
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin D routed to IRQ 11
          Region 4: I/O ports at c040 [size=32]
          Kernel driver in use: uhci_hcd

  00:01.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 03)
          Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
          Physical Slot: 1
          Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Interrupt: pin A routed to IRQ 9
          Kernel driver in use: piix4_smbus

  00:02.0 VGA compatible controller [0300]: Cirrus Logic GD 5446 [1013:00b8] (prog-if 00 [VGA controller])
          Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
          Physical Slot: 2
          Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Region 0: Memory at fc000000 (32-bit, prefetchable) [size=32M]
          Region 1: Memory at febf0000 (32-bit, non-prefetchable) [size=4K]
          Expansion ROM at febe0000 [disabled] [size=64K]

  00:03.0 Ethernet controller [0200]: Red Hat, Inc Virtio network device [1af4:1000]
          Subsystem: Red Hat, Inc Device [1af4:0001]
          Physical Slot: 3
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
          Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin A routed to IRQ 10
          Region 0: I/O ports at c060 [size=32]
          Region 1: Memory at febf1000 (32-bit, non-prefetchable) [size=4K]
          Expansion ROM at febc0000 [disabled] [size=128K]
          Capabilities: [40] MSI-X: Enable+ Count=3 Masked-
                  Vector table: BAR=1 offset=00000000
                  PBA: BAR=1 offset=00000800
          Kernel driver in use: virtio-pci

  00:04.0 SCSI storage controller [0100]: Red Hat, Inc Virtio SCSI [1af4:1004]
          Subsystem: Red Hat, Inc Device [1af4:0008]
          Physical Slot: 4
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
          Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin A routed to IRQ 11
          Region 0: I/O ports at c000 [size=64]
          Region 1: Memory at febf2000 (32-bit, non-prefetchable) [size=4K]
          Capabilities: [40] MSI-X: Enable+ Count=4 Masked-
                  Vector table: BAR=1 offset=00000000
                  PBA: BAR=1 offset=00000800
          Kernel driver in use: virtio-pci

  00:06.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon [1af4:1002]
          Subsystem: Red Hat, Inc Device [1af4:0005]
          Physical Slot: 6
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin A routed to IRQ 10
          Region 0: I/O ports at c080 [size=32]
          Kernel driver in use: virtio-pci

  root@tamriel:/var/crash/201412191519# lspci -vnvn
  00:00.0 Host bridge [0600]: Intel Corporation 440FX - 82441FX PMC [Natoma] [8086:1237] (rev 02)
          Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
          Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

  00:01.0 ISA bridge [0601]: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] [8086:7000]
          Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
          Physical Slot: 1
          Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

  00:01.1 IDE interface [0101]: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] [8086:7010] (prog-if 80 [Master])
          Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
          Physical Slot: 1
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
          Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable)
          Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
          Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable)
          Region 4: I/O ports at c0a0 [size=16]
          Kernel driver in use: ata_piix

  00:01.2 USB controller [0c03]: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] [8086:7020] (rev 01) (prog-if 00 [UHCI])
          Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
          Physical Slot: 1
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin D routed to IRQ 11
          Region 4: I/O ports at c040 [size=32]
          Kernel driver in use: uhci_hcd

  00:01.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 03)
          Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
          Physical Slot: 1
          Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Interrupt: pin A routed to IRQ 9
          Kernel driver in use: piix4_smbus

  00:02.0 VGA compatible controller [0300]: Cirrus Logic GD 5446 [1013:00b8] (prog-if 00 [VGA controller])
          Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
          Physical Slot: 2
          Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Region 0: Memory at fc000000 (32-bit, prefetchable) [size=32M]
          Region 1: Memory at febf0000 (32-bit, non-prefetchable) [size=4K]
          Expansion ROM at febe0000 [disabled] [size=64K]

  00:03.0 Ethernet controller [0200]: Red Hat, Inc Virtio network device [1af4:1000]
          Subsystem: Red Hat, Inc Device [1af4:0001]
          Physical Slot: 3
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
          Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin A routed to IRQ 10
          Region 0: I/O ports at c060 [size=32]
          Region 1: Memory at febf1000 (32-bit, non-prefetchable) [size=4K]
          Expansion ROM at febc0000 [disabled] [size=128K]
          Capabilities: [40] MSI-X: Enable+ Count=3 Masked-
                  Vector table: BAR=1 offset=00000000
                  PBA: BAR=1 offset=00000800
          Kernel driver in use: virtio-pci

  00:04.0 SCSI storage controller [0100]: Red Hat, Inc Virtio SCSI [1af4:1004]
          Subsystem: Red Hat, Inc Device [1af4:0008]
          Physical Slot: 4
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
          Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin A routed to IRQ 11
          Region 0: I/O ports at c000 [size=64]
          Region 1: Memory at febf2000 (32-bit, non-prefetchable) [size=4K]
          Capabilities: [40] MSI-X: Enable+ Count=4 Masked-
                  Vector table: BAR=1 offset=00000000
                  PBA: BAR=1 offset=00000800
          Kernel driver in use: virtio-pci

  00:06.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon [1af4:1002]
          Subsystem: Red Hat, Inc Device [1af4:0005]
          Physical Slot: 6
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
          Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin A routed to IRQ 10
          Region 0: I/O ports at c080 [size=32]
          Kernel driver in use: virtio-pci

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Follow ups

[Bug 1404374] Re: Apparently ipv6-related crash in Linux version 3.13.0-43-generic (buildd@tipua) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu 1) ) #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 (Ubuntu 3.13.0-43.72-generic 3.13.11.11)
From: Joseph Salisbury, 2015-01-05
[Bug 1404374] Re: Apparently ipv6-related crash in Linux version 3.13.0-43-generic (buildd@tipua) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu 1) ) #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 (Ubuntu 3.13.0-43.72-generic 3.13.11.11)
From: Marco Bettio, 2014-12-22
[Bug 1404374] Re: Apparently ipv6-related crash in Linux version 3.13.0-43-generic (buildd@tipua) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu 1) ) #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 (Ubuntu 3.13.0-43.72-generic 3.13.11.11)
From: Stephen Frost, 2014-12-19
[Bug 1404374] WifiSyslog.txt
From: Stephen Frost, 2014-12-19
[Bug 1404374] UdevLog.txt
From: Stephen Frost, 2014-12-19
[Bug 1404374] UdevDb.txt
From: Stephen Frost, 2014-12-19
[Bug 1404374] ProcModules.txt
From: Stephen Frost, 2014-12-19
[Bug 1404374] ProcInterrupts.txt
From: Stephen Frost, 2014-12-19
[Bug 1404374] ProcCpuinfo.txt
From: Stephen Frost, 2014-12-19
[Bug 1404374] Lspci.txt
From: Stephen Frost, 2014-12-19
[Bug 1404374] Re: Apparently ipv6-related crash in Linux version 3.13.0-43-generic (buildd@tipua) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu 1) ) #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 (Ubuntu 3.13.0-43.72-generic 3.13.11.11)
From: Stephen Frost, 2014-12-19
[Bug 1404374] Missing required logs.
From: Brad Figg, 2014-12-19
[Bug 1404374] [NEW] Apparently ipv6-related crash in Linux version 3.13.0-43-generic (buildd@tipua) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu 1) ) #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 (Ubuntu 3.13.0-43.72-generic 3.13.11.11)
From: Stephen Frost, 2014-12-19
References

[Bug 1404374] [NEW] Apparently ipv6-related crash in Linux version 3.13.0-43-generic (buildd@tipua) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu 1) ) #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 (Ubuntu 3.13.0-43.72-generic 3.13.11.11)
From: Stephen Frost, 2014-12-19