#4245: ghci panic: thread blocked indefinitely in an MVar operation
--------------------------+-------------------------------------------------
Reporter: pturnbull | Owner:
Type: bug | Status: new
Priority: normal | Component: GHCi
Version: 6.12.3 | Keywords: MVar
Testcase: | Blockedby:
Os: MacOS X | Blocking:
Architecture: x86 | Failure: GHCi crash
--------------------------+-------------------------------------------------
I stumbled across this error today:
{{{
phil ~
$ ghci
GHCi, version 6.12.3: 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>
[1]+ Stopped ghci
phil ~
$ fg
ghci
^C^C
Prelude>
ghc: panic! (the 'impossible' happened)
(GHC version 6.12.3 for i386-apple-darwin):
thread blocked indefinitely in an MVar operation
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
phil ~
$
}}}
Steps to reproduce:
* start ghci
* ctrl-z
* fg
* ctrl-c
* ctrl-c
* enter
* wait ~2 seconds
I'm not sure if it is related but while waiting for the impossible to
happen, any characters typed are not echoed to the screen.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4245>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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