ecryptfs test on btrfs failing on "no space left on device"

Running the QA tests for lts-quantal on bare-metal (4 machines, 2 Intel and 2 AMD, i386 and amd64 archs). All fail on ecryptfs/brtfs with the same error.

Ubuntu-bug still not set (no apport hook for the PPA kernel). Please tell me what data you would want.

** Test output: (console): **

+ echo 'ecryptfs testing on btrfs'
-------------------------------------------------------------------------------------------------
+ echo -------------------------------------------------------------------------------------------------
+ sudo ./tests/run_tests.sh -K -c destructive -b 1000000 -D /mnt/image -l /mnt/lower -u /mnt/upper -f btrfs
Failed to write 32 bytes, position 613717080: No space left on device
Failed to close //mnt/upper/etl-extend-file-random.sh-iS62tUkJOJ/test.img: No space left on device
+ RC1=1
+ sudo ./tests/run_tests.sh -K -c safe -b 1000000 -D /mnt/image -l /mnt/lower -u /mnt/upper -f btrfs
+ RC2=0
+ RC_TEST=1
+ return 1
+ RC=1
+ '[' 1 -ne 0 ']'
+ FAIL=1
+ exit 1
+ RCTEMP=1
+ SSH_PARMS=
+ return 1
+ RC=1
+ '[' 1 -eq 0 ']'
+ printf 'FAIL ecryptfs tests failed\n'
FAIL ecryptfs tests failed

** Test output: **

Running eCryptfs filesystem tests on btrfs
miscdev-bad-count pass
extend-file-random FAIL
trunc-file pass
directory-concurrent pass
file-concurrent pass

Test Summary:
4 passed
1 failed
Running eCryptfs filesystem tests on btrfs
lp-469664 pass
lp-524919 pass
lp-509180 pass
lp-613873 pass
lp-745836 pass
lp-870326 pass
lp-885744 pass
lp-926292 pass
inotify pass
mmap-dir pass
read-dir pass
setattr-flush-dirty pass
inode-race-stat pass

Test Summary:
13 passed
0 failed

*NOTE* I cannot run ubuntu-bug on this kernel, the apport hook has not been updated yet.