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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
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