I've run into these frequent conftest.exe "permission denied" failures while doing various Windows builds on the new win64-rev2 (ix-mn-w0864-*) machines: ====== checking whether the C++ compiler (cl ) works... no ------ config.log ------ rm: cannot lstat `conftest.exe': Permission denied configure: error: installation or configuration problem: C++ compiler cannot create executables. ====== This has been happening often enough to consider it a blocker to rolling out the new platform. I've been testing the settings in https://bugzilla.mozilla.org/show_bug.cgi?id=545015#c24 and initial test results indicate it has resolved the file locking problem. To summarize, the manual changes I made are: - disable the application experience service - turn off application compatibility engine - turn off program compatibility engine The file indexing service does not appear to be installed so that step of the solution is a no-op.

This will now be handled by GPO 2008_compatibility_off: Computer Configuration> Policies> Windows Settings> Security Settings> System Services> Application Experience Service disabled Computer Configuration> Policies> Administrative Templates> Windows Components> Turn off Application Compatibility Engine disabled Turn off Program Compatibility Assistant disabled

I left these settings as they were: Turn off Application Compatibility Engine disabled Turn off Program Compatibility Assistant disabled Then manually re-enabled and started the "Application Experience" service. Following that, I started two new builds and did not hit the conftest.exe locking problem that had been plaguing that build type (WINNT 6.1 x86-64 try build). Mark: can you please adjust the GPO change you made above to enable the Application Experience service? I'd like to try with this setting for awhile, since I did see some contention on web forums about whether disabling that service helped or hindered file locking.

John, the Application Experience service has been re-enable. It should be running on the next reboot.

(In reply to John Hopkins (:jhopkins) from comment #0) > I've run into these frequent conftest.exe "permission denied" failures while > doing various Windows builds on the new win64-rev2 (ix-mn-w0864-*) machines: > > ====== > checking whether the C++ compiler (cl ) works... no > ------ config.log ------ > rm: cannot lstat `conftest.exe': Permission denied > configure: error: installation or configuration problem: C++ compiler cannot > create executables. > ====== > > This has been happening often enough to consider it a blocker to rolling out > the new platform. > > I've been testing the settings in > https://bugzilla.mozilla.org/show_bug.cgi?id=545015#c24 and initial test > results indicate it has resolved the file locking problem. To summarize, > the manual changes I made are: > > - disable the application experience service > - turn off application compatibility engine > - turn off program compatibility engine > > The file indexing service does not appear to be installed so that step of > the solution is a no-op. Works like a charm after doing the 3 steps...

So far, I have not hit the conftest.exe problem since re-enabling the application experience service (and leaving the compatibility engines set to 'disabled').

This is looking pretty solid now. I'll reopen if I run into any other file locking problems.