#11771: ghc.exe: `panic'! (the 'impossible' happened); thread blocked indefinitely in an MVar operation -------------------------------+---------------------------------------- Reporter: YoYoYonnY | Owner: Type: bug | Status: new Priority: low | Milestone: Component: GHCi | Version: 7.10.3 Resolution: | Keywords: Operating System: Windows | Architecture: Unknown/Multiple Type of failure: GHCi crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------+---------------------------------------- Comment (by itaibn): I had a similar crash in GHC 7.4.1. Also can't replicate. Full session: {{{ GHCi, version 7.4.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> 2**9 512.0 Prelude> 2^9 512 Prelude> 9^9 387420489 Prelude> 9^9^9 ^C^C^C^C^C^C^C^C^C^C^CcInterPrelude> Prelude> ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for x86_64-unknown-linux): 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/11771#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler