Public bug reported:

No matter if I change the btrfs raid level to 0 or 1 Ubuntu 12.10
crashes. The screen is frozen and btrfs balance stopped. After turning
off and on btrfs continues the balance job without any further crashes
or errors.

What I have: btrfs with @, @home, @opt, @var all mounted respectively

What I do:

sudo btrfs balance start -dconvert=raid0 -mconvert=raid1 /
or
sudo btrfs balance start -dconvert=raid1 -mconvert=raid1 /

The crash happend once every time I changed the raid level on a root
mounted btrfs. There is no /var/log/syslog or dmesg message about this.

** Affects: btrfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1133179

Title:
  btrfs balance crashes Ubuntu 12.10 when online changing raid level

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