Linaro-android snowball builds boot-test failed on Lava-Daily Dashboard image

on our Daily dashboard Linaro-android Snowball image boot test failed on the following image

Dashboard url: http://validation.linaro.org/lava-server/dashboard/image-reports/linaro-android-member-ste_snowball-linaro-jb

"android.url": "https://android-build.linaro.org/jenkins/job/linaro-android-member-ste_snowball-linaro-jb/292/
job link: http://validation.linaro.org/lava-server/scheduler/job/53374
complete log: http://validation.linaro.org/lava-server/scheduler/job/53374/log_file

the log report shown the following:
U8500 $ <LAVA_DISPATCHER>2013-05-02 12:42:15 PM WARNING: Sending newline in case of corruption.
<LAVA_DISPATCHER>2013-05-02 12:44:15 PM WARNING: Sending newline in case of corruption.
<LAVA_DISPATCHER>2013-05-02 12:46:15 PM WARNING: Sending newline in case of corruption.
<LAVA_DISPATCHER>2013-05-02 12:48:15 PM WARNING: Sending newline in case of corruption.
<LAVA_DISPATCHER>2013-05-02 12:50:15 PM WARNING: Sending newline in case of corruption.
<LAVA_DISPATCHER>2013-05-02 12:52:16 PM WARNING: Sending newline in case of corruption.
<LAVA_DISPATCHER>2013-05-02 12:54:16 PM ERROR: boot_linaro_android_image failed: booting into android test image failed
Traceback (most recent call last):
  File "/srv/lava/.<email address hidden>/lava_dispatcher/actions/boot_control.py", line 55, in run
    adb_check=adb_check)
  File "/srv/lava/.<email address hidden>/lava_dispatcher/client/base.py", line 458, in boot_linaro_android_image
    raise OperationFailed("booting into android test image failed")
OperationFailed: booting into android test image failed
<LAVA_DISPATCHER>2013-05-02 12:54:16 PM WARNING: [ACTION-E] boot_linaro_android_image is finished with error (Failed to boot test image.).
<LAVA_DISPATCHER>2013-05-02 12:54:16 PM INFO: Submitting the test result with parameters = {u'token': '<HIDDEN>', u'stream': u'/private/team/linaro/testing/', u'server': u'https://<email address hidden>/lava-server/RPC2/'}
<LAVA_DISPATCHER>2013-05-02 12:54:17 PM INFO: Dashboard : https://validation.linaro.org/lava-server/dashboard/permalink/bundle/0e27c1fc42baf797556829e01cafc661339b2e31/

** the problem seems to be on the test definition file **

~~ seems the same issue reproduced with the builds ~~
build url: https://android-build.linaro.org/jenkins/job/linaro-android-member-ste_snowball-linaro-jb/270/
job id: http://validation.linaro.org/lava-server/scheduler/job/51528

build url: https://android-build.linaro.org/jenkins/job/linaro-android-member-ste_snowball-linaro-jb/269/
job id: http://validation.linaro.org/lava-server/scheduler/job/51471

observed from the http://validation.linaro.org/lava-server/scheduler/