#7944: GHC goes into an apparently infinite loop at -O2 -------------------------------------+------------------------------------- Reporter: bos | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: | Keywords: Operating System: MacOS X | Architecture: x86_64 (amd64) Type of failure: Compile- | Difficulty: Unknown time crash | Blocked By: Test Case: | Related Tickets: 5550 Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by thomie): * status: infoneeded => new Comment: I don't think this is fixed yet. Steps to reproduce (with a quick build of today's ghc master in directory ~/ghc-build, on Linux): {{{ cabal install --with-ghc=ghc-build/inplace/bin/ghc-stage2 vector git clone https://github.com/thomie/inttable cd inttable ~/ghc-build/inplace/bin/ghc-stage2 -O2 -v3 --make Repro }}} This last step freezes after about 1 second, with final output: {{{ *** SpecConstr: Result size of SpecConstr }}} CPU is at 100%, until I kill it after a few minutes. Contrary to Brian's observation, I do see an increase in memory usage over time. I get the same results when using ghc-7.8.3 instead of current ghc master. I had to make a small change to Bryan's `inttable` repository (hide some imports from base). See the mentioned github url. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7944#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler