kernel BUG at /build/buildd/linux-2.6.35/fs/btrfs/volumes.c:1980!

[Donald Allwright]

Performing command "btrfs filesystem balance snapshots/initial/"
where snapshots/initial was a btrfs snapshot of the filesystem straight after a fresh install of Maverick Alpha 3 (AMD64 desktop version) with /boot on /dev/sda1 (ext2), / on /dev/sda3 (btrfs) in VirtualBox instance. It exited with 'Segmentation fault' before the crash report icon appeared. An update to the 'default' tree using Update manager was taking place simultaneously so the file system would have been under heavy load.

ProblemType: KernelOops
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-14-generic 2.6.35-14.19
Regression: No
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.35-14.19-generic 2.6.35
Uname: Linux 2.6.35-14-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: I82801AAICH [Intel 82801AA-ICH], device 0: Intel ICH [Intel 82801AA-ICH]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: donald 1114 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'I82801AAICH'/'Intel 82801AA-ICH with STAC9700,83,84 at irq 5'
   Mixer name : 'SigmaTel STAC9700,83,84'
   Components : 'AC97a:83847600'
   Controls : 34
   Simple ctrls : 24
Date: Fri Aug 6 22:32:21 2010
Failure: oops
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=b0eb5d83-12cc-4e83-a2cd-02c98ae07f7b
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100803.1)
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
Lsusb:
 Bus 001 Device 002: ID 80ee:0021
 Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: innotek GmbH VirtualBox
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-14-generic root=/dev/sda3 ro quiet splash
RelatedPackageVersions: linux-firmware 1.37
RfKill:

SourcePackage: linux
Title: kernel BUG at /build/buildd/linux-2.6.35/fs/btrfs/volumes.c:1980!
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH