snmpd memory leak on repeated snmpwalk?

We're seeing snmpd (NET-SNMP version:  5.4) apparently leaking memory when
subjected to repeated snmpwalks. It seems to happen wherever we walk, but
most noticeably on perl-delivered OIDs.

To reproduce, take the perl demo code from:
- http://www.net-snmp.org/wiki/index.php/Tut:Extending_snmpd_using_perl
Configure it into snmpd.conf and restart snmpd.

Then in one terminal start repeated walks with:
# while true ; do snmpwalk -v2c -c public -m all localhost
.1.3.6.1.4.1.8072.999 ; done

And in another terminal watch the memory usage grow with:
# while true ; do ps -o pid,bsdstart,state,rss,size,vsize,args -Csnmpd |
tail -1 ; sleep 2 ; done

Is this normal? Is it a known problem? Is there a fix/workaround
available? Or are we doing something wrong? (Or is the tutorial code bad?)

Running on Linux 2.4.32 (in case that is relevant).

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