[GHC] #4245: ghci panic: thread blocked indefinitely in an MVar operation

[GHC]

#4245: ghci panic: thread blocked indefinitely in an MVar operation
--------------------------+-------------------------------------------------
    Reporter:  pturnbull  |        Owner:            
        Type:  bug        |       Status:  new       
    Priority:  normal     |    Milestone:            
   Component:  GHCi       |      Version:  6.12.3    
    Keywords:  MVar       |     Testcase:            
   Blockedby:             |   Difficulty:            
          Os:  MacOS X    |     Blocking:            
Architecture:  x86        |      Failure:  GHCi crash
--------------------------+-------------------------------------------------

Comment(by simonmar):

 I don't see the bug on Linux, but I do see something else slightly
 strange.  After foregrounding GHCi again, the first Ctrl-C brings up
 another `Prelude>` prompt which is fine, but if I then Ctrl-D to exit I
 get

 {{{
 Prelude>
 <stdin>: hWaitForInput: end of file
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4245#comment:1>
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