one of the most freuqent failing tests is here: UNEXPECTED(failure): samba.tests.dcerpc.raw_protocol.samba.tests.dcerpc.raw_protocol.TestDCERPC_BIND.test_lsa_multi_auth_connect1u(chgdcpass) REASON: Exception: Exception: Traceback (most recent call last): File "/m/bjacke/a424/b841410/samba-def-build/bin/python/samba/tests/dcerpc/raw_protocol.py", line 7724, in test_lsa_multi_auth_connect1u return self._test_lsa_multi_auth_connect1(smb_auth_creds, File "/m/bjacke/a424/b841410/samba-def-build/bin/python/samba/tests/dcerpc/raw_protocol.py", line 7666, in _test_lsa_multi_auth_connect1 self.do_single_request(call_id=1, ctx=ctx1, io=get_user_name, File "/m/bjacke/a424/b841410/samba-def-build/bin/python/samba/tests/dcerpc/raw_testcase.py", line 563, in do_single_request self.verify_pdu(rep, samba.dcerpc.dcerpc.DCERPC_PKT_FAULT, call_id, File "/m/bjacke/a424/b841410/samba-def-build/bin/python/samba/tests/dcerpc/raw_testcase.py", line 988, in verify_pdu self.assertIsNotNone(p, "No valid pdu") AssertionError: unexpectedly None : No valid pdu If the test is broken, it should be fixed, if the test cannot be fixed in the short term, please mark it as flapping.