GHC 6.2.1 retaining profiling broken?; program segfaults with -hr flag

[Bayley, Alistair]

I've tried to get a heap retaining profile (-hr) of my (largish) program
with GHC 6.2.1 (on Windows NT4), but it segfaults when run. I can produce a
-hc profile without grief. Is this a known problem?

P.S. I've trimmed my program back a bit to provide a test case (and to
remove FFI code), but there are still five modules involved.

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