Adding heap profiling RTS options causes segfault

Adding either -hy or -hc causes a segfault in the thread-delay benchmark. To reproduce:

git clone git://github.com/tibbe/event.git
cd event
autoreconf
cabal configure --enable-library-profiling
cabal build
$EDITOR benchmarks/Makefile

Change the last line in the following section:

thread-delay: ghc-flags += -package stm
thread-delay: $(lib) Args.o ThreadDelay.o
	ranlib $(lib)
	$(ghc) $(ghc-flags) -threaded -o $@ $(filter %.o,$^) $(lib)

to

	$(ghc) $(ghc-flags) -threaded -rtsopts -o $@ $(filter %.o,$^) $(lib)

This enables the +RTS options. Finally, run:

make -C benchmarks/ clean thread-delay ENABLE_PROFILING=1
./benchmarks/thread-delay -n50000 +RTS -hy

This gives me a segfault.

Trac metadata

Trac field	Value
Version	6.13
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Profiling
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