tclsh eats all available memory (port -d upgrade installed)

[Dave Evans]

I have 317 ports installed. None require upgrading.

Starting  sudo port -d upgrade installed  and monitoring
the memory usage with Activity Monitor, after a few seconds
tclsh RSIZE is up to 300 MB.   After a couple of minutes
the RSIZE is up to 1.5GB and the free memory is down
to  8 MB.  They stay at these values for another couple of minutes
when tclsh gives up with an out of memory error.

DEBUG: Found port in file:///opt/local/var/macports/sources/
rsync.macports.org/r
elease/ports/gnome/gnome-icon-theme
tclsh(34820,0xa0592fa0) malloc: *** mmap(size=1884160) failed (error
code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
unable to alloc 1882835 bytes
Abort trap

Does any one know why tclsh is using so much memory?  The only
message in this mailing list referring to the problem was a couple of
months ago. See http://tinyurl.com/5vn3qu and
(on another mailing list) http://tinyurl.com/6s7sxh

My configuration: 2GB memory, OSX 10.5.4, Xcode 3.1,
500 GB of free disk space (so swap space cannot be a problem)
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