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[Bug 1447879] [NEW] Systemd outsmarts itself with btrfs

 

Public bug reported:

I have two SSDs in raid0 (striped) configuration with my root and home
as separate subvolumes.  This setup has worked fine for several Ubuntu
releases, but fails with systemd on 15.04.  systemd does manage to mount
root, but then looks like it is trying to fsck the "disk" for home which
is nonsensical.  After 90 seconds it drops into a useless shell where I
can't fix things.

Relevant lines from /etc/fstab

UUID=3ff68715-0daa-4e44-8de2-0997f36d8ab6 /               btrfs   defaults,device=/dev/disk/by-id/ata-Crucial_CT960M500SSD1_1347095B97B4-part1,device=/dev/disk/by-id/ata-Crucial_CT960M500SSD1_1338094EA3CA-part1,autodefrag,compress=lzo,subvol=@ 0       1
UUID=3ff68715-0daa-4e44-8de2-0997f36d8ab6 /home           btrfs   defaults,device=/dev/disk/by-id/ata-Crucial_CT960M500SSD1_1347095B97B4-part1,device=/dev/disk/by-id/ata-Crucial_CT960M500SSD1_1338094EA3CA-part1,autodefrag,compress=lzo,subvol=@home 0       2


Note how the lines are identical except for the subvol value.  I originally didn't have the device= bits either but had to add it for root because of how `btrfs device scan` is run.  With or without it present doesn't make any difference for home.

There is no such problem booting with upstart

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: systemd 219-7ubuntu3
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: XFCE
Date: Thu Apr 23 19:45:38 2015
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic root=UUID=3ff68715-0daa-4e44-8de2-0997f36d8ab6 ro rootflags=subvol=@ nomdmonddf nomdmonisw init=/sbin/upstart
SourcePackage: systemd
SystemdDelta:
 [EXTENDED]   /lib/systemd/system/systemd-timesyncd.service → /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
 
 1 overridden configuration files found.
UpgradeStatus: Upgraded to vivid on 2015-04-23 (0 days ago)
dmi.bios.date: 08/13/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2104
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8Z77-V PRO
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2104:bd08/13/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8Z77-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

-- 
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https://bugs.launchpad.net/bugs/1447879

Title:
  Systemd outsmarts itself with btrfs

Status in systemd package in Ubuntu:
  New

Bug description:
  I have two SSDs in raid0 (striped) configuration with my root and home
  as separate subvolumes.  This setup has worked fine for several Ubuntu
  releases, but fails with systemd on 15.04.  systemd does manage to
  mount root, but then looks like it is trying to fsck the "disk" for
  home which is nonsensical.  After 90 seconds it drops into a useless
  shell where I can't fix things.

  Relevant lines from /etc/fstab

  UUID=3ff68715-0daa-4e44-8de2-0997f36d8ab6 /               btrfs   defaults,device=/dev/disk/by-id/ata-Crucial_CT960M500SSD1_1347095B97B4-part1,device=/dev/disk/by-id/ata-Crucial_CT960M500SSD1_1338094EA3CA-part1,autodefrag,compress=lzo,subvol=@ 0       1
  UUID=3ff68715-0daa-4e44-8de2-0997f36d8ab6 /home           btrfs   defaults,device=/dev/disk/by-id/ata-Crucial_CT960M500SSD1_1347095B97B4-part1,device=/dev/disk/by-id/ata-Crucial_CT960M500SSD1_1338094EA3CA-part1,autodefrag,compress=lzo,subvol=@home 0       2

  
  Note how the lines are identical except for the subvol value.  I originally didn't have the device= bits either but had to add it for root because of how `btrfs device scan` is run.  With or without it present doesn't make any difference for home.

  There is no such problem booting with upstart

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: systemd 219-7ubuntu3
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu Apr 23 19:45:38 2015
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic root=UUID=3ff68715-0daa-4e44-8de2-0997f36d8ab6 ro rootflags=subvol=@ nomdmonddf nomdmonisw init=/sbin/upstart
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/systemd-timesyncd.service → /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
   
   1 overridden configuration files found.
  UpgradeStatus: Upgraded to vivid on 2015-04-23 (0 days ago)
  dmi.bios.date: 08/13/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2104
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z77-V PRO
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2104:bd08/13/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8Z77-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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References