#11175: Holding Ctrl+C on Windows GHCI Prompt crashes with concurrency panic ----------------------------------------+--------------------------------- Reporter: cwfenner | Owner: Type: bug | Status: new Priority: lowest | Milestone: Component: GHCi | Version: 7.10.2 Keywords: | Operating System: Windows Architecture: Unknown/Multiple | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: ----------------------------------------+--------------------------------- When I hold Control-C in the GHCI prompt (on either Windows Powershell or Command Prompt), then release, the prompt stops responding. The first few keystrokes will be ignored altogether, then the next ignored intermittently. After typing around 5 words, GHCi crashes with the following output: {{{ ghc.exe: panic! (the 'impossible' happened) (GHC version 7.10.2 for x86_64-unknown-mingw32): thread blocked indefinitely in an MVar operation }}} If I don't type after holding Ctrl+C, GHCi seems to sit happily without crashing. No amount of waiting after holding Ctrl+C seems to make it recover. It does not matter whether I press return or not. However, faster typing seems to make it crash in fewer keystrokes. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11175 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler