If you create a new custom observer based on a syscall observer, add it to the
session, and re-start the session, one or more of the processes in the process
group will not have a thread trace - just the proc name. See the screenshot...
Created attachment 1268 [details]
Shot of the messed up trace
Should be two lines - one for the process, and one for the thread.
Notice how the threads box is also empty.
Might be more of a problem than I thought - when I exited Frysk this time, all
the zsh processes from that screenshot were killed!