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[Bug 1247647] [NEW] Kernel oops during btrfs access

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Gregor Suhr <gregor@xxxxxxxxxxxx>
Date: Sun, 03 Nov 2013 19:33:43 -0000
Reply-to: Bug 1247647 <1247647@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

cat /proc/version_signature 
Ubuntu 3.11.0-12.19-generic 3.11.3


root@ubuntunas:~# sudo 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) [size=1]
	Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
	Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1]
	Region 4: I/O ports at c160 [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 c100 [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 Device [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 febd0000 [disabled] [size=64K]
	Kernel driver in use: cirrus

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 c120 [size=32]
	Region 1: Memory at febf1000 (32-bit, non-prefetchable) [size=4K]
	Expansion ROM at febe0000 [disabled] [size=64K]
	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 block device [1af4:1001]
	Subsystem: Red Hat, Inc Device [1af4:0002]
	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=2 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Kernel driver in use: virtio-pci

00:05.0 SCSI storage controller [0100]: Red Hat, Inc Virtio block device [1af4:1001]
	Subsystem: Red Hat, Inc Device [1af4:0002]
	Physical Slot: 5
	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 c040 [size=64]
	Region 1: Memory at febf3000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [40] MSI-X: Enable+ Count=2 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Kernel driver in use: virtio-pci

00:06.0 SCSI storage controller [0100]: Red Hat, Inc Virtio block device [1af4:1001]
	Subsystem: Red Hat, Inc Device [1af4:0002]
	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 11
	Region 0: I/O ports at c080 [size=64]
	Region 1: Memory at febf4000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [40] MSI-X: Enable+ Count=2 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Kernel driver in use: virtio-pci

00:07.0 SCSI storage controller [0100]: Red Hat, Inc Virtio block device [1af4:1001]
	Subsystem: Red Hat, Inc Device [1af4:0002]
	Physical Slot: 7
	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 c0c0 [size=64]
	Region 1: Memory at febf5000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [40] MSI-X: Enable+ Count=2 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Kernel driver in use: virtio-pci

00:08.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon [1af4:1002]
	Subsystem: Red Hat, Inc Device [1af4:0005]
	Physical Slot: 8
	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 c140 [size=32]
	Kernel driver in use: virtio-pci

00:09.0 System peripheral [0880]: Intel Corporation 6300ESB Watchdog Timer [8086:25ab]
	Subsystem: Red Hat, Inc Device [1af4:1100]
	Physical Slot: 9
	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 febf6000 (32-bit, non-prefetchable) [size=16]

root@ubuntunas:~#

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-12-generic 3.11.0-12.19
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116,  1 Nov  3 20:23 seq
 crw-rw---- 1 root audio 116, 33 Nov  3 20:23 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.12.5-0ubuntu2.1
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: Sun Nov  3 20:26:49 2013
HibernationDevice: RESUME=UUID=2447d766-b078-4ed0-87f3-c27412c10649
InstallationDate: Installed on 2011-02-03 (1003 days ago)
InstallationMedia: Ubuntu-Server 10.10 "Maverick Meerkat" - Release amd64 (20101007)
IwConfig:
 eth0      no wireless extensions.
 
 lo        no wireless extensions.
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Bochs Bochs
MarkForUpload: True
PciMultimedia:
 
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 cirrusdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=0dbf4328-2e66-42b3-88dd-b96a5c25b11d ro console=tty0 console=ttyS0,115200n8 crashkernel=384M-2G:64M,2G-:128M quiet
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-12-generic N/A
 linux-backports-modules-3.11.0-12-generic  N/A
 linux-firmware                             1.116
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: Upgraded to saucy on 2013-08-25 (70 days ago)
dmi.bios.date: 01/01/2007
dmi.bios.vendor: Bochs
dmi.bios.version: Bochs
dmi.chassis.type: 1
dmi.chassis.vendor: Bochs
dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
dmi.product.name: Bochs
dmi.sys.vendor: Bochs

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


** Tags: amd64 apport-bug saucy

-- 
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https://bugs.launchpad.net/bugs/1247647

Title:
  Kernel oops during btrfs access

Status in “linux” package in Ubuntu:
  New

Bug description:
  cat /proc/version_signature 
  Ubuntu 3.11.0-12.19-generic 3.11.3

  
  root@ubuntunas:~# sudo 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) [size=1]
  	Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
  	Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1]
  	Region 4: I/O ports at c160 [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 c100 [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 Device [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 febd0000 [disabled] [size=64K]
  	Kernel driver in use: cirrus

  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 c120 [size=32]
  	Region 1: Memory at febf1000 (32-bit, non-prefetchable) [size=4K]
  	Expansion ROM at febe0000 [disabled] [size=64K]
  	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 block device [1af4:1001]
  	Subsystem: Red Hat, Inc Device [1af4:0002]
  	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=2 Masked-
  		Vector table: BAR=1 offset=00000000
  		PBA: BAR=1 offset=00000800
  	Kernel driver in use: virtio-pci

  00:05.0 SCSI storage controller [0100]: Red Hat, Inc Virtio block device [1af4:1001]
  	Subsystem: Red Hat, Inc Device [1af4:0002]
  	Physical Slot: 5
  	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 c040 [size=64]
  	Region 1: Memory at febf3000 (32-bit, non-prefetchable) [size=4K]
  	Capabilities: [40] MSI-X: Enable+ Count=2 Masked-
  		Vector table: BAR=1 offset=00000000
  		PBA: BAR=1 offset=00000800
  	Kernel driver in use: virtio-pci

  00:06.0 SCSI storage controller [0100]: Red Hat, Inc Virtio block device [1af4:1001]
  	Subsystem: Red Hat, Inc Device [1af4:0002]
  	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 11
  	Region 0: I/O ports at c080 [size=64]
  	Region 1: Memory at febf4000 (32-bit, non-prefetchable) [size=4K]
  	Capabilities: [40] MSI-X: Enable+ Count=2 Masked-
  		Vector table: BAR=1 offset=00000000
  		PBA: BAR=1 offset=00000800
  	Kernel driver in use: virtio-pci

  00:07.0 SCSI storage controller [0100]: Red Hat, Inc Virtio block device [1af4:1001]
  	Subsystem: Red Hat, Inc Device [1af4:0002]
  	Physical Slot: 7
  	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 c0c0 [size=64]
  	Region 1: Memory at febf5000 (32-bit, non-prefetchable) [size=4K]
  	Capabilities: [40] MSI-X: Enable+ Count=2 Masked-
  		Vector table: BAR=1 offset=00000000
  		PBA: BAR=1 offset=00000800
  	Kernel driver in use: virtio-pci

  00:08.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon [1af4:1002]
  	Subsystem: Red Hat, Inc Device [1af4:0005]
  	Physical Slot: 8
  	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 c140 [size=32]
  	Kernel driver in use: virtio-pci

  00:09.0 System peripheral [0880]: Intel Corporation 6300ESB Watchdog Timer [8086:25ab]
  	Subsystem: Red Hat, Inc Device [1af4:1100]
  	Physical Slot: 9
  	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 febf6000 (32-bit, non-prefetchable) [size=16]

  root@ubuntunas:~#

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Nov  3 20:23 seq
   crw-rw---- 1 root audio 116, 33 Nov  3 20:23 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.12.5-0ubuntu2.1
  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: Sun Nov  3 20:26:49 2013
  HibernationDevice: RESUME=UUID=2447d766-b078-4ed0-87f3-c27412c10649
  InstallationDate: Installed on 2011-02-03 (1003 days ago)
  InstallationMedia: Ubuntu-Server 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Bochs Bochs
  MarkForUpload: True
  PciMultimedia:
   
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=0dbf4328-2e66-42b3-88dd-b96a5c25b11d ro console=tty0 console=ttyS0,115200n8 crashkernel=384M-2G:64M,2G-:128M quiet
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-08-25 (70 days ago)
  dmi.bios.date: 01/01/2007
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
  dmi.product.name: Bochs
  dmi.sys.vendor: Bochs

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Follow ups

[Bug 1247647] Re: Kernel oops during btrfs access
From: Launchpad Bug Tracker, 2014-02-08
[Bug 1247647] Re: Kernel oops during btrfs access
From: Joseph Salisbury, 2013-12-09
[Bug 1247647] Re: Kernel oops during btrfs access
From: Joseph Salisbury, 2013-11-05
[Bug 1247647] Re: Kernel oops during btrfs access
From: Joseph Salisbury, 2013-11-04
[Bug 1247647] Re: Kernel oops during btrfs access
From: Joseph Salisbury, 2013-11-04
[Bug 1247647] Re: Kernel oops during btrfs access
From: Gregor Suhr, 2013-11-04
[Bug 1247647] Re: Kernel oops during btrfs access
From: Joseph Salisbury, 2013-11-04
[Bug 1247647] Status changed to Confirmed
From: Brad Figg, 2013-11-03
[Bug 1247647] [NEW] Kernel oops during btrfs access
From: Gregor Suhr, 2013-11-03
References

[Bug 1247647] [NEW] Kernel oops during btrfs access
From: Gregor Suhr, 2013-11-03