ioref001 segfaults depending on how much stack space it has

The ioref001 test is segfaulting, depending on how much stack space you give it:

$ '/home/ian/ghc/darcs/ghc/ghc/stage2-inplace/ghc' -fforce-recomp -dcore-lint -dcmm-lint -Dx86_64_unknown_linux  -dno-debug-output -o ioref001 ioref001.hs -O -fasm +RTS -K32m -RTS 

$ ./ioref001  
Stack space overflow: current size 8388608 bytes.
Use `+RTS -Ksize' to increase it.

$ ./ioref001 +RTS -K16m -RTS
Stack space overflow: current size 16000000 bytes.
Use `+RTS -Ksize' to increase it.
zsh: segmentation fault  ./ioref001 +RTS -K16m -RTS

$ ./ioref001 +RTS -K32m -RTS
done
zsh: segmentation fault  ./ioref001 +RTS -K32m -RTS

$ ./ioref001 +RTS -K100m -RTS
done

Trac metadata

Trac field	Value
Version	6.8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown