Seems like this particular issue has been reported here: http://www.spinics.net/lists/linux-btrfs/msg43084.html
and fixed with upstream fix: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3d84be799194147e04c0e3129ed44a948773b80a which explains why 4.1-rc2 fixes this issue. -- 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/1413008 Title: Kernel BUG shortly after mounting btrfs filesystem Status in linux package in Ubuntu: Confirmed Bug description: This bug happens entirely reproducibly after mounting a multi-disc btrfs filesystem I have. It is reproducible on the current Vivid 3.18 kernel and the mainline 3.19-rc5 build; I recall this bug also happening on Utopic's 3.16 kernel, but don't have logs. All processes that touch the filesystem then hang indefinitely in the kernel. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.18.0-9-generic 3.18.0-9.10 ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2 Uname: Linux 3.18.0-9-generic x86_64 AlsaDevices: total 0 crw-rw----+ 1 root audio 116, 1 Jan 21 10:03 seq crw-rw----+ 1 root audio 116, 33 Jan 21 10:03 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.15.1-0ubuntu2 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: Date: Wed Jan 21 10:05:37 2015 InstallationDate: Installed on 2015-01-20 (0 days ago) InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Alpha amd64 (20150116) IwConfig: lo no wireless extensions. em1 no wireless extensions. MachineType: HP ProLiant MicroServer PciMultimedia: ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.18.0-9-generic root=UUID=b5d97f60-81e7-4dd8-a8a7-b2bfef3eeb52 ro rootflags=subvol=@ init=/lib/systemd/systemd RelatedPackageVersions: linux-restricted-modules-3.18.0-9-generic N/A linux-backports-modules-3.18.0-9-generic N/A linux-firmware 1.140 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/01/2013 dmi.bios.vendor: HP dmi.bios.version: O41 dmi.chassis.type: 7 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnHP:bvrO41:bd10/01/2013:svnHP:pnProLiantMicroServer:pvr:cvnHP:ct7:cvr: dmi.product.name: ProLiant MicroServer dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413008/+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
