Version : Firefox 43.0a1 Build ID : 20150908111149 User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0 PC : Ubuntu 14.04 TLS Steps to Reproduce: 1. I pull the latest code from mozilla-central (changeset: 5fe9ed3edd68) 2. Run ./mach build 3. Execute xpcshell unit tests in netwerk folder ./mach xpcshell-test <path-to-repo>/mozilla-central/netwerk/test/unit/test_udpsocket.js Expected Result: The test script should pass. Actual Result: FAIL [Parent] netwerk/test/unit/testsocket.js
(In reply to Ethan Tseng [:ethan] from comment #0) > Actual Result: > FAIL [Parent] > netwerk/test/unit/testsocket.js ^^^^^^^^^^ Typo. Should be: netwerk/test/unit/test_udpsocket.js
*** Notes *** 1. This test failure does not happen on Mac OS, and not on Treeherder either. It only happens on Linux locally. 2. I think this is a recent regression because I didn't see this failure last week while running xpcshell tests under netwerk/test/unit. 3. The log shows a "Harness FAIL" message, which could be a clue. But I don't know how to trace this issue.