btrfs filesystem balance <device> <path> results in Kernel BUG

[Márcio Santos]

Added a new device to an existing btrfs volume.
Running a balance operation results in the Kernel BUG attached.
From a few quick Google Searches, it appears to be a know bug with the specific Kernel Version in use and a patch with the fix should have been added to 3.11.4.

Kind regards,
Márcio Santos

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 Oct 21 07:33 seq
 crw-rw---- 1 root audio 116, 33 Oct 21 07:33 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.12.5-0ubuntu2
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:
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Date: Mon Oct 21 08:29:18 2013
HibernationDevice: RESUME=UUID=54a74c3c-7415-44f4-9cb7-f037483e6c2a
IwConfig:
 lo no wireless extensions.

 virbr0 no wireless extensions.

 em1 no wireless extensions.
MachineType: HP ProLiant MicroServer
MarkForUpload: True
PciMultimedia:

ProcEnviron:
 LANGUAGE=en_US:en
 TERM=screen
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.11.0-12-generic root=UUID=4674f3ab-c702-4476-a424-d90911b416b0 ro rootflags=subvol=@ splash quiet vt.handoff=7
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 2013-10-18 (2 days ago)
dmi.bios.date: 07/29/2011
dmi.bios.vendor: HP
dmi.bios.version: O41
dmi.chassis.asset.tag: MicroServer
dmi.chassis.type: 7
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnHP:bvrO41:bd07/29/2011:svnHP:pnProLiantMicroServer:pvr:cvnHP:ct7:cvr:
dmi.product.name: ProLiant MicroServer
dmi.sys.vendor: HP

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Can you see if this bug is resolved in the latest 3.11 upstream stable kernel:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11.6-saucy/

If it is, the fix will make it's way into Saucy through the normal stable update process.

[Márcio Santos (marcio.santos)]

Already installed the kernel .debs.

Just need to get home and force restart the machine, because the balance kernel bug stops server from restarting using normal methods. Need to use "finger in button" method :)

Will update when tested.

[Márcio Santos (marcio.santos)]

I can confirm that using upstream kernel 3.11.6 allows "btrfs filesystem balance" to complete successfully.