reproducible crash in profiled builds when -hb or -hr are enabled in ghc 8.0rc4 (and 7.10.3 and older)

Carter Schonwald carter.schonwald at
Sun Apr 24 21:42:51 UTC 2016

Hello all,
I've found a reproducible (on OS X) crash when using biographical or
retainer profiling (different crashes respectively) that doesn't happen
otherwise on profiled builds executables, should provide enough
information to replicate it (though by no means minimal :(, but if need be
i'll try to help out on that front)

i've marked it as "highest" because an otherwise ok program triggers a
sigsegv with -hb! (which may or may not be related to the different crash
that -hr triggered).

I'm not sure how to best go about debugging this sort of crash (though if i
can find time later this week i'm happy to help)

many thanks
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