Unrecoverable error on customFieldDelete in ContactAddWithCustomData.test

Jul 23 14:38:00 [info] $Fatal Error Details = Array
(
[callback] => Array
(
[0] => CRM_Core_Error
[1] => handle
)

[code] => a515ac9c2796ca0e23adbe92c68fc9fc
[message] => DB Error: a515ac9c2796ca0e23adbe92c68fc9fc
[mode] => 16
[debug_info] => ALTER TABLE civicrm_value_test_custom_group_3 DROP COLUMN `test_country_9`, DROP FOREIGN KEY FK_civicrm_value_test_custom_group_3_te
st_country_9 [nativecode=1025 ** Error on rename of './civitrunk/civicrm_value_test_custom_group_3' to './civitrunk/#sql2-69-238' (errno: 152)]
[type] => DB_Error
[user_info] => ALTER TABLE civicrm_value_test_custom_group_3 DROP COLUMN `test_country_9`, DROP FOREIGN KEY FK_civicrm_value_test_custom_group_3_tes
t_country_9 [nativecode=1025 ** Error on rename of './civitrunk/civicrm_value_test_custom_group_3' to './civitrunk/#sql2-69-238' (errno: 152)]
[to_string] => [db_error: message="DB Error: a515ac9c2796ca0e23adbe92c68fc9fc" code=0 mode=callback callback=CRM_Core_Error::handle prefix="" info="
ALTER TABLE civicrm_value_test_custom_group_3 DROP COLUMN `test_country_9`, DROP FOREIGN KEY FK_civicrm_value_test_custom_group_3_test_country_9 [nativecode=102
5 ** Error on rename of './civitrunk/civicrm_value_test_custom_group_3' to './civitrunk/#sql2-69-238' (errno: 152)]"]
)

Jul 23 14:38:00 [info] $backTrace = /Users/mover/Documents/Work/CiviCRM/trunk/CRM/Core/Error.php, backtrace, 190
, handle,
/Users/mover/Documents/Work/CiviCRM/trunk/packages/PEAR.php, call_user_func, 912
/Users/mover/Documents/Work/CiviCRM/trunk/packages/DB.php, PEAR_Error, 969
/Users/mover/Documents/Work/CiviCRM/trunk/packages/PEAR.php, DB_Error, 574
/Users/mover/Documents/Work/CiviCRM/trunk/packages/DB/common.php, raiseError, 1903
/Users/mover/Documents/Work/CiviCRM/trunk/packages/DB/mysql.php, raiseError, 898
/Users/mover/Documents/Work/CiviCRM/trunk/packages/DB/mysql.php, mysqlRaiseError, 327
/Users/mover/Documents/Work/CiviCRM/trunk/packages/DB/common.php, simpleQuery, 1216
/Users/mover/Documents/Work/CiviCRM/trunk/packages/DB/DataObject.php, query, 2394
/Users/mover/Documents/Work/CiviCRM/trunk/packages/DB/DataObject.php, _query, 1587
/Users/mover/Documents/Work/CiviCRM/trunk/CRM/Core/DAO.php, query, 144
/Users/mover/Documents/Work/CiviCRM/trunk/CRM/Core/DAO.php, query, 866
/Users/mover/Documents/Work/CiviCRM/trunk/CRM/Core/BAO/SchemaHandler.php, executeQuery, 264
/Users/mover/Documents/Work/CiviCRM/trunk/CRM/Core/BAO/CustomField.php, alterFieldSQL, 1469
/Users/mover/Documents/Work/CiviCRM/trunk/CRM/Core/BAO/CustomField.php, createField, 849
/Users/mover/Documents/Work/CiviCRM/trunk/api/v2/CustomGroup.php, deleteField, 255
/Users/mover/Documents/Work/CiviCRM/trunk/tests/CiviTest/CiviUnitTestCase.php, civicrm_custom_field_delete, 773
/Users/mover/Documents/Work/CiviCRM/trunk/tests/api/v2/ContactAddWithCustomData.test, customFieldDelete, 38
/Users/mover/Documents/Work/CiviCRM/trunk/packages/SimpleTest/invoker.php, tearDown, 69
/Users/mover/Documents/Work/CiviCRM/trunk/packages/SimpleTest/invoker.php, invoke, 126
/Users/mover/Documents/Work/CiviCRM/trunk/packages/SimpleTest/errors.php, invoke, 49
/Users/mover/Documents/Work/CiviCRM/trunk/packages/SimpleTest/invoker.php, invoke, 126
/Users/mover/Documents/Work/CiviCRM/trunk/packages/SimpleTest/exceptions.php, invoke, 42
/Users/mover/Documents/Work/CiviCRM/trunk/packages/SimpleTest/test_case.php, invoke, 143
/Users/mover/Documents/Work/CiviCRM/trunk/packages/drupal/simpletest/drupal_test_case.php, run, 535
/Users/mover/Documents/Work/CiviCRM/trunk/packages/SimpleTest/test_case.php, run, 561
/Users/mover/Documents/Work/CiviCRM/trunk/packages/SimpleTest/test_case.php, run, 561
/Users/mover/Documents/Work/CiviCRM/trunk/packages/drupal/simpletest/drupal_unit_tests.php, run, 125
/Users/mover/Documents/Work/CiviCRM/trunk/packages/drupal/simpletest/simpletest.module, run, 240
/Users/mover/Documents/Work/CiviCRM/trunk/packages/drupal/simpletest/simpletest.module, simpletest_run_tests, 142
/Users/mover/Documents/Work/CiviCRM/www/drupal/includes/form.inc, simpletest_overview_form_submit, 775
/Users/mover/Documents/Work/CiviCRM/www/drupal/includes/form.inc, form_execute_handlers, 409
/Users/mover/Documents/Work/CiviCRM/www/drupal/includes/form.inc, drupal_process_form, 119
/Users/mover/Documents/Work/CiviCRM/trunk/packages/drupal/simpletest/simpletest.module, drupal_get_form, 97
, simpletest_entrypoint,
/Users/mover/Documents/Work/CiviCRM/www/drupal/includes/menu.inc, call_user_func_array, 348
/Users/mover/Documents/Work/CiviCRM/www/drupal/index.php, menu_execute_active_handler, 18