#6125: GHCi crash
------------------------------+---------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.0.3 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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I received the following message about a crash while running ghci. I'm
definitely doing some things I should not be, but this was also not
expected; I'm not sure if it's something that should be fixed or if this
is a case of "don't do that". Namely, I'm starting a Google App Engine
dev_appserver.py script using System.Process.runCommand. The trouble is, I
can't install the latest process package on my Windows system, so I'm
stuck with some outdated commands - I can't terminate a process group on
Windows, so I use terminateProcess to just kill the top process created,
then terminate the underlying python.exe through Task Manager.
You can see where I tried to reload my .hs below after killing python.exe;
I was trying to type ":r". I'm not sure if this is related, or just the
issue with running/exiting App Engine. The crash may be related to the
fact that I'm using the ghci standard output for the App Engine process
(somehow, it trapped the ":" in my command even after I killed python.exe,
but before typing anything else). I did manually ping the local App Engine
server after terminating the top process, but before killing python.exe -
I noticed the output was redirected to ghci. This may just be a strange
issue with how App Engine traps messages.
*Main> r
<interactive>:1:1: Not in scope: `r'
*Main>
ghc.exe: panic! (the 'impossible' happened)
(GHC version 7.0.3 for i386-unknown-mingw32):
thread blocked indefinitely in an MVar operation
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6125>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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