[Info-vax] debugging stack corruption on Macro64?

[John E. Malmberg]

In the libffi code, I am calling a macro64 subroutine.

In that routine, a frame array is passed in r17.  This array was created 
with _ALLOCA()

When I use stq instructions to update that array, sometimes I am getting 
stack corruption.

When I replace the actual C program with a small stub C program, the 
stack corruption is not seen.

The R17 value appears to be quadword aligned when the corruption occurs.

Regards,
-John