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[Bug 1446464] Re: System fails to boot stuck on Scanning for btrfs


** Attachment added: "Call trace"

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  System fails to boot stuck on Scanning for btrfs

Status in linux package in Ubuntu:

Bug description:
  Ubuntu 15.04 with 3.19.0-15-generic.

  Current status:
  System fails to finish booting with Scanning for btrfs.  If you wait long enough you see:
  INFO: task exe:208 blocked for more than 120 seconds
  INFO: task btrfs-transacti:230 blocked for more than 120 seconds
  (message repeats every 2 minutes)

  Ctrl-alt-delete does work to reboot system at this stage.
  Booting with upstart still hangs.
  Recovery mode fails to boot as well
  Tried options system.debug-shell (from https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1444070) which got me a few more details

  Story of getting here:  Was playing Team Fortress 2 and Internet went
  down.   Trying to get network-manager to reload caused some issues.
  Eventually decided to reboot.  Hung at reboot and ended up powering
  down by switch.

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