Hudson's process tree killerfeature should kill all processes that were initiated during a build to avoid "left-overs" piling up in the process table.

This feature ceased to work - at least on slave nodes - starting with SVN revision 34736.

Reproduction

1. Add new slave node to master.
2. Create a freestyle project that starts a process that will remain running even after the build has been completed, e.g. with a "shell script" build step "xclock &".
3. Run that project on the slave node.

Observed behaviour

1. xclock is started and will remain open, even after the build has been completed.

Desired behaviour

1. xclock is started - and killed again after the build has been completed.