#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 allmar): I got a similar crash with GHCi 8.0.1 on Windows 10 (64-bit). I also interrupted my running program (with Ctrl+C) right before the crash. My error message was as follows. {{{ 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 }}} The crash has only happened once so far; I haven't been able to reproduce it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11771#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler