SegFault caused by some IO+Arrays+GC interaction

Hello!

The attached program uses no unsafe operations and yet it segfaults from
time to time. Try it on some file of moderate size, like:

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.2.1
$ ghc -O --make Bug -o Bug
Chasing modules from: Bug
Compiling Main             ( Bug.hs, Bug.o )
Linking ...
$ ls -l /etc/termcap
-rw-r--r--    1 root     root       737535 lip 20  2001 /etc/termcap
$ ./Bug < /etc/termcap > /dev/null
Segmentation fault (core dumped)
$ ./Bug < /etc/termcap > /dev/null
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.2.1
$ gcc --version
gcc (GCC) 3.3.3
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is
NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

$ uname -a
Linux green.local.gem.pl 2.4.18-10 #1 Wed Aug 7 10:26:48 EDT 2002 i686
unknown

Notice that this program calls performGC after every processed word
and commenting this out seems to eliminate the problem. Perhaps this
is a silly thing to do, but I don't think it should result in SEGV.

If this qualifies as a bug, tell me if I can do anything to help you
nail it down.

Best regards,
Tom

-- 
.signature: Too many levels of symbolic links

Bug.hs
Description: Text document

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