I am experiencing the same issue on ubuntu 18.04. root and home are both on btrfs, so purging the btrfs package is not an option. During the boot the system stops and waits following the message "scanning for btrfs..."
-- 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/1460447 Title: Boot slow, "scanning for btrfs filesystems" takes 100 seconds Status in linux package in Ubuntu: Confirmed Bug description: I installed 14.10 and used btrfs for /home. Later, I did a clean install of 15.04, using the same /home partition. Ever since then, boots have been agonizingly slow; all the delay appears to be while the message "scanning for btrfs filesystems" is diplayed early in boot. The system is an i7 with one disk: root@i7:~# fdisk /dev/sda Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disklabel type: dos Disk identifier: 0x00007f84 Device Boot Start End Sectors Size Id Type /dev/sda1 * 2048 117186559 117184512 55.9G 83 Linux /dev/sda2 117186560 234373119 117186560 55.9G 83 Linux /dev/sda3 234375166 1953523711 1719148546 819.8G 5 Extended /dev/sda5 234375168 273434623 39059456 18.6G 82 Linux swap / Solaris /dev/sda6 273436672 1953523711 1680087040 801.1G 83 Linux root@i7:~# df -T | grep sd /dev/sda2 ext4 57542652 10103624 44492980 19% / /dev/sda6 btrfs 840043520 172076728 665321064 21% /home I'll attach a bootchart, but I suspect the btrfs delay happens before the bootchart starts? ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-16-generic 3.19.0-16.16 ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3 Uname: Linux 3.19.0-16-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.17.2-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: dank 2176 F.... pulseaudio /dev/snd/controlC0: dank 2176 F.... pulseaudio CurrentDesktop: Unity Date: Sun May 31 08:53:37 2015 HibernationDevice: RESUME=UUID=417f2bba-dea3-496b-ad18-702d4dc6f223 InstallationDate: Installed on 2015-05-16 (14 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) IwConfig: eth0 no wireless extensions. lo no wireless extensions. lxcbr0 no wireless extensions. MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic root=UUID=270a0d36-9ed9-4e58-b909-175db447838d ro quiet splash init=/lib/systemd/systemd-bootchart RelatedPackageVersions: linux-restricted-modules-3.19.0-16-generic N/A linux-backports-modules-3.19.0-16-generic N/A linux-firmware 1.143 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: 08/16/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P2.50 dmi.board.name: X58 Extreme dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.50:bd08/16/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnX58Extreme:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1460447/+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
