Running johntheripper, the libunwind stack trace fails because it is looking for a register called 'st5' which is currently not supported or listed in IsaX8664. The failure is present on both EM64T and AMD64 machines.
Apparently johntheripper was built with 32-bit code on the 64-bit system. However, this exception occurs because Frysk was using X8664Isa for this program instead of IA32.