#12654: Panic on interrupting the evaluation of foldl (\x a -> if x > 100 then 100 else x+a) 0 [1..] -------------------------------------+------------------------------------- Reporter: Kuros | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 8.0.1 Keywords: ghci panic | Operating System: Windows mvar thread block | Architecture: x86_64 | Type of failure: GHCi crash (amd64) | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Full log below (it only interrupted about a minute after i pressed ctrl-C, and I pressed it several times since it didn't respond): *Main> foldl (\x a -> if x > 100 then 100 else x+a) 0 [1..] Interrupted. *Main> ghc.exe: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-unknown-mingw32): thread blocked indefinitely in an MVar operation Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12654 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler