The "MPatrol" is a very powerful memory debugging tool.
It is at
http://www.cbmamiga.demon.co.uk/mpatrol
and at
http://www.rpmfind.net go here and search mpatrol.
If you are using linux then you must download the mpatrol*.src.rpm file from the
rpmfind.net. To update the mpatrol*.src.rpm to latest version, you can use the
old mpatrol.spec file and latest mpatrol*.tar.gz file to rebuild new *.src.rpm.
On linux contrib cdrom see mem_test*.rpm package
and at
http://www.rpmfind.net go here and search mem_test.
On linux cdrom see ElectricFence*.rpm package
and at
http://www.rpmfind.net go here and search electricfence.