Biography heap profiling aborts

My program, when compiled with -prof -auto-all and run with -hb -H500M -sstderr runs for a little while then dies with the following message:

Server: internal error: Invalid object in processHeapClosureForDead(): 27188
    (GHC version 6.6 for i386_apple_darwin)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Abort trap

As this is commercial code, I can't easily provide a repro, though I am happy to perform experiments under direction to try to isolate the problem.

cheers, Tom

Trac metadata

Trac field	Value
Version	6.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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Operating system	Unknown
Architecture	Unknown