#10510: Testsuite driver does not run tests in parallel on Windows -------------------------------------+------------------------------------- Reporter: thomie | Owner: Type: bug | Status: new Priority: high | Milestone: Component: Test Suite | Version: 7.10.1 Resolution: | Keywords: Operating System: Windows | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by Phyx-): So what I know so far is that this seems to be a bug in the `msys-2.0` runtime that happens sporadically. In my case it manifests itself inside the `diff.exe` that is being called by the Python testsuite scripts. [[Image(http://i.imgur.com/IWciMQM.png)]] `diff.exe` gets stuck in an infinite loop while starting up. Eventually, you'll either run out of cores or the tests finish but it'll wait on the one that's stuck. Looking at the stack of the application shows: {{{ msys-2.0.dll!Ordinal1816+0x1b7 msys-2.0.dll!Ordinal208+0x3e984 msys-2.0.dll!Ordinal130+0x171c msys-2.0.dll!Ordinal1816+0x1b7 ntdll.dll!RtlInitializeCriticalSection+0x10e ntdll.dll!RtlInitializeCriticalSection+0x88 ntdll.dll!RtlIsCriticalSectionLockedByThread+0x2a5 ntdll.dll!RtlIsCriticalSectionLockedByThread+0x1ed ntdll.dll!RtlGetVersion+0x7c0 ntdll.dll!RtlInitializeHandleTable+0xe89 ntdll.dll!RtlInitializeHandleTable+0x45 ntdll.dll!LdrInitializeThunk+0x10 }}} and it never exits from `msys-2.0.dll!Ordinal1816`. Curiously `msys-2.0.dll` does not export anything with ordinal `1816` so I am not sure what happens here. Unfortunately because this is happening inside a critical section the debuggers won't attach. `strace`, `gdb` and `windbg` just wait to break in. Eventually `windbg` will time out and suspend the program to allow you to look, but it doesn't allow you to step to see what may be causing the loop. I'm currently attempting to find the `msys-2.0 runtime` version that introduced the issue. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10510#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler