#13052: unsafePerformIO duped on multithread if within the same IO thunk -------------------------------------+------------------------------------- Reporter: gelisam | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2-rc2 Resolution: | Keywords: Operating System: MacOS X | Architecture: x86_64 Type of failure: Incorrect result | (amd64) at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by akio): * cc: akio (added) Comment: The parallel GC may duplicate constructors and other immutable closures, but isn't it supposed to be careful not to duplicate thunks? Also I can reproduce this behavior (on Linux) with and without `+RTS -qg`, so the GC behavior doesn't seem to explain this completely. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13052#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler