#4245: ghci panic: thread blocked indefinitely in an MVar operation
---------------------------------+------------------------------------------
Reporter: pturnbull | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.0.2
Component: GHCi | Version: 7.0.1
Keywords: MVar | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: x86 | Failure: GHCi crash
---------------------------------+------------------------------------------
Changes (by Jafet):
* version: 6.12.3 => 7.0.1
* os: MacOS X => Unknown/Multiple
Comment:
I've encountered the same bug, but in the Windows console with GHC 7.0.1.
To reproduce:
1. Start {{{ghci}}} from cmd.exe (or Cygwin bash) in a console.
2. Press {{{^C}}}.
3. Hold down the return key.
{{{
C:\>ghci
GHCi, version 7.0.1: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Prelude> ^C
C:\>
Prelude>
C:\>
Prelude>
C:\>
... after a moment ...
Prelude>
C:\>
Prelude>
ghc.exe: panic! (the 'impossible' happened)
(GHC version 7.0.1 for i386-unknown-mingw32):
thread blocked indefinitely in an MVar operation
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
C:\>
C:\>
}}}
After {{{^C}}}, GHC backgrounds itself from cmd.exe and subsequent input
finds its way to the shell:
{{{
Prelude> ^C
C:\>
Prelude> input
'input' is not recognized as an internal or external command,
operable program or batch file.
C:\>input
'nput' is not recognized as an internal or external command,
operable program or batch file.
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4245#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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