[GHC] #11771: ghc.exe: `panic'! (the 'impossible' happened); thread blocked indefinitely in an MVar operation
#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 Keywords: | Operating System: Windows Architecture: Unknown/Multiple | Type of failure: GHCi crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: ----------------------------------------+------------------------------- Here's a "fun" one: {{{#!hs *Main> main Interrupted. *Main> *Main> !cl ghc.exe: panic! (the 'impossible' happened) (GHC version 7.10.3 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
ghci --version
The Glorious Glasgow Haskell Compilation System, version 7.10.3 }}} Don't mind the {{{!cl}}}, GHC crashed as soon as the interupt was registered, I usually {{{:!cls}}} after I execute main. I will backup the code in case someone wants to see if it's a bug in my program, but I didn't use multithreading myself, and I don't think the vector, unordered-containers, bytestring and parsec packages use threading either (all heavily at work, though)... The interupt was nececairy because my code was generating a infinite (oops) collection of these bad boys, using all sorts of folds, maps, etc.: {{{#!hs newtype ParserData = ParserData { unpackParserData :: HashMap ByteString (ParserData -> Either ByteString (Parser ())) } }}} I am wondering if this could be a problem with Windows, because the system was running slow at the time of the interupt; The {{{Alt+Tab}}} screen didn't appear until after the interupt. I don't think I can manage to reproduce this bug, which is unfortunate aswell (low priority because of that :c). Either way, it crashed, that's all I can tell you for sure. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11771 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#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
#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
#11771: ghc.exe: `panic'! (the 'impossible' happened); thread blocked indefinitely in an MVar operation -------------------------------+---------------------------------------- Reporter: YoYoYonnY | Owner: (none) 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: #14299 | Differential Rev(s): Wiki Page: | -------------------------------+---------------------------------------- Changes (by bgamari): * related: => #14299 Comment: This looks quite similar to #14299. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11771#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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