#8839: 64 bit windows executables compiled with ghc-7.8rc2 segfault when allocate more than 4G of memory -----------------------------------+---------------------------------- Reporter: awson | Owner: simonmar Type: bug | Status: patch Priority: highest | Milestone: 7.8.2 Component: Runtime System | Version: 7.8.1-rc2 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 (amd64) Type of failure: Runtime crash | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -----------------------------------+---------------------------------- Changes (by awson): * status: new => patch Comment: Oh, after another painful bug hunting I've found the [https://github.com/ghc/ghc/commit/36b042fbf60210ab6859d96e5b4b5e121085816d culprit]. `unsigned long` is 32 bit in Windows 64-bit ABI. I've attached the patch forcing block size to be `unsigned long long` on x86_64. Perhaps, it may be narrowed to 64-bit windows only, though. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8839#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler