ghci 6.6 dies on nobench 'chess' program with unknown opcode error

GHCi 6.6:

This program from the nobench/nofib suite:

http://www.cse.unsw.edu.au/~dons/code/nobench/real/chess

using the input file mygame.pgn, runs to completion on x86/openbsd and amd64/linux. However on x86/linux (two different machines), it dies with a corrupted bytecode error, but only with the -w and -v0 flags!

On my test machine I can reproduce this error 1/2 the time:

$ pwd
/home/dons/nobench/real/chess

$ make clean ; runghc -w -v0  chess.hs  < mygames.pgn > /dev/null
rm -f chess Main.hbc  *.actual *.status *~ *.compile *.db
--- GOOD ---

$ make clean ; runghc -w -v0  chess.hs  < mygames.pgn > /dev/null
rm -f chess Main.hbc  *.actual *.status *~ *.compile *.db
chess.hs: internal error: interpretBCO: unknown or unimplemented opcode 55076
    (GHC version 6.6 for i386_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
-- FAIL ---

$ make clean ; runghc -w -v0  chess.hs  < mygames.pgn > /dev/null
rm -f chess Main.hbc  *.actual *.status *~ *.compile *.db
--- GOOD --- 

$ make clean ; runghc -w -v0  chess.hs  < mygames.pgn > /dev/null
rm -f chess Main.hbc  *.actual *.status *~ *.compile *.db
chess.hs: internal error: interpretBCO: unknown or unimplemented opcode 55076
    (GHC version 6.6 for i386_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
-- FAIL ---

On a bigger machine I was able to reproduce it, though only 1/4 times:

$ make clean ; runghc -w -v0  chess.hs  < mygames.pgn > /dev/null
rm -f chess Main.hbc  *.actual *.status *~ *.compile *.db
chess.hs: internal error: interpretBCO: unknown or unimplemented opcode 34596
    (GHC version 6.6 for i386_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Trac metadata

Trac field	Value
Version	6.6
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
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