If you enable 'developer mode' for Taskmanager (right click the icon, choose information, doubleclick on the line saying '(DEVELOPERMODE)' and then press 'save'), then if you right click on a task you get the option to 'dump task state'. This dumps the state of a task to the system debug log in the same way as if it had made an illegal access. From there you get the program counter (called SRR0) and a stack trace. Not perfect, but a lot better than adding dprintf() all over the place.