According to some embodiments, a first bus may be monitored, via a first debug gate, the first bus being to exchange data between a first processing system and a second processing system. A second bus may also be monitored, via a second debug gate, the second bus being to exchange data between the second processing system and a third processing system. Responsive to the monitoring of at least one of the first or second buses, execution of applications, executing on at least two of the processing units, may be interrupted.