test_query_log tests fail during test setup in UBSAN build

test setup failure

common/custom_cluster_test_suite.py:225: in teardown_method
    impalad.wait_for_exit()
common/impala_cluster.py:471: in wait_for_exit
    while self.__get_pid() is not None:
common/impala_cluster.py:414: in __get_pid
    assert len(pids) < 2, "Expected single pid but found %s" % ", ".join(map(str, pids))
E   AssertionError: Expected single pid but found 21791, 23520