internal error: ARR_WORDS object entered! (threaded2 / -N2)

With the 2317 test:

$ '/home/ian/ghc/darcs/ghc/ghc/stage2-inplace/ghc' -fforce-recomp -dcore-lint -dcmm-lint -Dx86_64_unknown_linux  -dno-debug-output --make -o 2317 2317 -O -threaded

$ ./2317  +RTS -N2 -RTS
100000
zsh: segmentation fault  ./2317 +RTS -N2 -RTS

$ ./2317  +RTS -N2 -RTS
100000
2317: internal error: ARR_WORDS object entered!
    (GHC version 6.9.20080906 for x86_64_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
zsh: abort      ./2317 +RTS -N2 -RTS

Trac metadata

Trac field	Value
Version	6.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown