Using attached stress tests on a P4 with IDE, 2.6.0-test8/test9 lockup
repeatably within 5 minutes to an hour.

It is generally pssible to break into kdb debugger but not into kgdb.

Tests running fine with 2.4.22 and 2.4.21 for 100s of hours

Requirements:

gnu tool chain
X 3 or 4
configured ready to compile 2.4 or 2.6 kernel source tree linked to /usr/src/linuxtest
/tmp directory and/or $TEMP set to a user writable temporary directory
200MB spare disk space

How to use:

$ ln -s /usr/src/yourlinux /usr/src/linuxtest
$ tar jxf ti-tests.tar.bz2

to start the test:

$ ti-tests/ti 1

to stop the test

$ ti-tests/ti 0

Regards
Michael