That looks better.  It crashed while deleting an exception, who's args
tuple has a bogus refcount.  Could be a refcount issue of the
exception or the args, or of something that that references them, or a
dangling pointer, or a buffer overrun, etc.

Things to try:
1) Run "pystack" in gdb, from Misc/gdbinit
2) Print the exception type.  Use "up" until you reach
BaseException_clear, then do "print self->ob_type->tp_name".  Also do
"print *self" and make sure the ob_refcnt is at 0 and the other fields
look sane.
3) Compile using --without-pymalloc and throw it at a real memory
debugger.  I'd suggest starting with your libc's own debugging
options, as they tend to be less invasive:
http://developer.apple.com/documentation/Performance/Conceptual/ManagingMemory/Articles/MallocDebug.html
.  If that doesn't work, look at Electric Fence, Valgrind, or your
tool of choice.