mach xpcshell-test was working from head on Friday, then when I pulled and clobbered yesterday started getting the following error with no patches applied. mchew@MOZILLA-10915 /q/mozilla-source/mozilla-central $ ./mach xpcshell-test netwerk/test/unit/test_backgroundfilesaver.js From _tests: Kept 14399 existing; Added/updated 13; Removed 0 files and 0 direct ories. 0:09.05 Found node at q:\mozilla-source\mozilla-central\testing\xpcshell\node 0:09.05 Found moz-spdy at q:\mozilla-source\mozilla-central\testing\xpcshell\mo z-spdy\moz-spdy.js 0:09.06 Could not run moz-spdy server: [Error 193] %1 is not a valid Win32 appl ication 0:09.06 Found moz-http2 at q:\mozilla-source\mozilla-central\testing\xpcshell\m oz-http2\moz-http2.js 0:09.06 Could not run moz-http2 server: [Error 193] %1 is not a valid Win32 app lication 0:09.06 INFO | Using at most 32 threads. 0:09.06 TEST-INFO | test_backgroundfilesaver.js | Test failed or timed out, wil l retry. 0:09.08 Retrying tests that failed when run in parallel. 0:09.08 INFO | Following exceptions were raised: 0:09.08 Traceback (most recent call last): File "q:\mozilla-source\mozilla-central\testing/xpcshell\runxpcshelltests.py", line 145, in run self.run_test() File "q:\mozilla-source\mozilla-central\testing/xpcshell\runxpcshelltests.py", line 537, in run_test self.test_object['here']) Exception: tests_root_dir is not a parent path of q:/mozilla-source/mozilla-cent ral/obj-i686-pc-mingw32/_tests/xpcshell/netwerk/test/unit Error running mach: ['xpcshell-test', 'netwerk/test/unit/test_backgroundfilesaver.js'] The error occurred in code that was called by the mach command. This is either a bug in the called code itself or in the way that mach is calling it. You should consider filing a bug for this issue. If filing a bug, please include the full output of mach, including this error message. The details of the failure are as follows: Exception: tests_root_dir is not a parent path of q:/mozilla-source/mozilla-cent ral/obj-i686-pc-mingw32/_tests/xpcshell/netwerk/test/unit File "q:\mozilla-source\mozilla-central\testing/xpcshell/mach_commands.py", li ne 339, in run_xpcshell_test return xpcshell.run_test(**params) File "q:\mozilla-source\mozilla-central\testing/xpcshell/mach_commands.py", li ne 102, in run_test return self._run_xpcshell_harness(**args) File "q:\mozilla-source\mozilla-central\testing/xpcshell/mach_commands.py", li ne 187, in _run_xpcshell_harness result = xpcshell.runTests(**filtered_args) File "q:\mozilla-source\mozilla-central\testing/xpcshell\runxpcshelltests.py", line 1483, in runTests raise exceptions[0]