When running o-s-t, and specifically when running add_secondary_storag, lago command is taking 100% CPU. I'm not sure where and why, and trying to narrow down the relevant threads did not yield a lot - it's not the Glance related functions, for example. I did try to make some changes to testlib.py, in an effort to reduce what I thought was a tight loop, but it made no effect (nevertheless, I think those are good changes): [ykaul@ykaul lago-ost-plugin]$ diff -u ovirtlago/testlib.py /usr/lib/python2.7/site-packages/ovirtlago/testlib.py --- ovirtlago/testlib.py 2017-07-28 11:15:31.506848944 +0300 +++ /usr/lib/python2.7/site-packages/ovirtlago/testlib.py 2017-07-28 09:29:19.403446285 +0300 @@ -209,7 +209,7 @@ return any(True for cls in cls_list if isinstance(obj, cls)) -def assert_equals_within(func, value, timeout, allowed_exceptions=None): +def assert_equals_within(func, value, timeout, allowed_exceptions=None, initial_wait=15): allowed_exceptions = allowed_exceptions or [] with utils.EggTimer(timeout) as timer: while not timer.elapsed(): @@ -219,12 +219,17 @@ return except Exception as exc: if _instance_of_any(exc, allowed_exceptions): + time.sleep(3) continue LOGGER.exception("Unhandled exception in %s", func) raise - time.sleep(3) + if initial_wait == 0: + time.sleep(3) + else: + time.sleep(initial_wait) + initial_wait = 0 try: raise AssertionError( '%s != %s after %s seconds' % (res, value, timeout) Any ideas how to debug this? I'm on F26, with latest Lago. Y.