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, https://ghc.haskell.org/trac/ghc/ticket/11978 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

-Carter