Some researchers tried to slip bad patches into the Linux kernel as a “test.” When they kept trying, Greg Kroah-Hartman, the Linux kernel maintainer for the stable branch, put an end to their efforts.

Greg Kroah-Hartman Bans University of Minnesota from Linux Development for Deliberately Buggy Patches

Source: Linux Today – Greg Kroah-Hartman Bans University of Minnesota from Linux Development for Deliberately Buggy Patches