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.