internal error: MVAR_CLEAN on mutable list

How to reproduce:

cabal update cabal install Allure --ghc-options="-dcore-lint -debug" -fvty $HOME/.cabal/bin/Allure

then press '.' a few times. (If nothing happens, press Q and try running it again.)

Allure: internal error: MVAR_CLEAN on mutable list GHC version 7.3.20110803 for x86_64_unknown_linux) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug Aborted

Without the debug options it segfaults much less often. I does not segfault at all, to my knowledge, when compiled with 6.12.3 and 7.0.*, even with the debug options. Neither of the other frontends (-fgtk nor -fcurses) compile with 7.3 right now, so I couldn't test those, but it may be informative to check them, as soon as the gtk2hs and/or hcurses libraries are updated to compile with 7.3.

Trac metadata

Trac field	Value
Version	7.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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