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[Andrej Rohaŭ <1445252@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-fixed-upstream

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https://bugs.launchpad.net/bugs/1445252

Title:
  [vivid] btrfs deadlock at mount/boot

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Utopic:
  Confirmed
Status in linux source package in Vivid:
  Triaged
Status in linux package in Debian:
  Fix Released

Bug description:
  My btrfs filesystem will not mount almost every boot for a few weeks
  now.  The only way I can currently fix this is to network boot into
  rescue mode to clear the log, would be great to import this into
  vivid.

  It appears to be this issue:
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9c4f61f01d269815bb7c37be3ede59c5587747c6
  https://btrfs.wiki.kernel.org/index.php/Gotchas

  > Stable kernel version 3.19.1+ can cause a deadlock at mount time
  > workaround: boot with older kernel, or run btrfs-zero-log to clear the log (beware of the consequences)
  > fix: scheduled for 3.19.5, or apply 9c4f61f01d269815bb7c37.
  > also affected: 3.14.35+, 3.18.9+

  break-fix: 381cf6587f8a8a8e981bc0c1aaaa8859b51dc756
  9c4f61f01d269815bb7c37be3ede59c5587747c6

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