kernel BUG at /build/linux-gcePop/linux-4.4.0/fs/btrfs/ctree.c:5202!

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ProblemType: KernelOops
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-2-generic 4.4.0-2.16
ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
Uname: Linux 4.4.0-2-generic x86_64
Annotation: Your system might become unstable now and might need to be restarted.
ApportVersion: 2.19.4-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: ortyl 13272 F.... pulseaudio
 /dev/snd/controlC1: ortyl 13272 F.... pulseaudio
 /dev/snd/pcmC0D0p: ortyl 13272 F...m pulseaudio
 /dev/snd/controlC0: ortyl 13272 F.... pulseaudio
Date: Tue Feb 9 21:19:45 2016
Failure: oops
HibernationDevice: RESUME=UUID=ad2f2c35-fa48-468a-abe5-7142eacdb868
InstallationDate: Installed on 2015-07-06 (218 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: LENOVO 2447MU0
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-2-generic root=UUID=624eaf1a-52a9-4780-aed5-d37d39a1be28 ro rootflags=subvol=@ thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions: kerneloops-daemon 0.12+git20090217-3ubuntu9
SourcePackage: linux
Title: kernel BUG at /build/linux-gcePop/linux-4.4.0/fs/btrfs/ctree.c:5202!
UpgradeStatus: Upgraded to xenial on 2016-02-09 (0 days ago)
dmi.bios.date: 01/22/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: G5ETA1WW (2.61 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2447MU0
dmi.board.vendor: LENOVO
dmi.board.version: 0B98401 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG5ETA1WW(2.61):bd01/22/2015:svnLENOVO:pn2447MU0:pvrThinkPadW530:rvnLENOVO:rn2447MU0:rvr0B98401WIN:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2447MU0
dmi.product.version: ThinkPad W530
dmi.sys.vendor: LENOVO