Strange errors with port

[David Evans]

Since upgrading trunk from svn today, port randomly crashes with the
following error types:

segmentation fault
buss error

and my favorite

tclsh(16432,0xa000ed88) malloc: *** error for object 0x3128a0: incorrect
checksum for freed object - object was probably modified after being
freed, break at szone_error to debug
tclsh(16432,0xa000ed88) malloc: *** set a breakpoint in szone_error to debug

The last one often (but not always) occurs at the end of the
configuration phase.

I scrubbed base and updated from svn and reinstalled with no change in
this behavior.

Has anyone else run into the same thing?

Dave