So... you *do* have Protection from Petrification on you or you don't? Do you have any items or spells that might reflect or bounch the petrification? If you don't and you fail the saving throw, you should die of course. Don't know why that would be causing a crash unless someone messed with the petrification spell or something.
That was what was in my baldur.err file after a crash without protection from petrification. (where it freezes)