this is mentioned on the LKML: http://www.spinics.net/lists/linux- btrfs/msg49766.html
** Bug watch added: Red Hat Bugzilla #1287508 https://bugzilla.redhat.com/show_bug.cgi?id=1287508 ** Also affects: linux via https://bugzilla.redhat.com/show_bug.cgi?id=1287508 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1529146 Title: btrfs balance leads to kernel panic Status in Linux: Unknown Status in linux package in Ubuntu: Triaged Status in linux source package in Wily: Triaged Bug description: Running rebalance on a 3 drive btrfs volume with both data and metadata set to raid1 leads to a kernel panic. In my case everything is on BTRFS so the only way I was able to capture the attached backtrace was by sending syslog messages to another server. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: linux-image-4.2.0-22-generic 4.2.0-22.27 ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6 Uname: Linux 4.2.0-22-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Dec 24 10:52 seq crw-rw---- 1 root audio 116, 33 Dec 24 10:52 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.19.1-0ubuntu5 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: Thu Dec 24 13:47:46 2015 HibernationDevice: RESUME=UUID=9087f95c-b9c5-4b2e-8837-758c7f9e978c InstallationDate: Installed on 2015-12-04 (19 days ago) InstallationMedia: Ubuntu-Server 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: Supermicro H8SGL PciMultimedia: ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/@boot/vmlinuz-4.2.0-22-generic root=UUID=341b28d7-2939-4b10-afc8-b865fd46eec6 ro rootflags=subvol=@ RelatedPackageVersions: linux-restricted-modules-4.2.0-22-generic N/A linux-backports-modules-4.2.0-22-generic N/A linux-firmware 1.149.3 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/25/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3.5 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: H8SGL dmi.board.vendor: Supermicro dmi.board.version: 1234567890 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 17 dmi.chassis.vendor: Supermicro dmi.chassis.version: 1234567890 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.5:bd11/25/2013:svnSupermicro:pnH8SGL:pvr1234567890:rvnSupermicro:rnH8SGL:rvr1234567890:cvnSupermicro:ct17:cvr1234567890: dmi.product.name: H8SGL dmi.product.version: 1234567890 dmi.sys.vendor: Supermicro To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1529146/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp