Major Description
With the recent refactor of the mesos containerizer (https://reviews.apache.org/r/22852/), it's likely that a child process dies before 'isolate' is called. For example, we may see this if someone accidentally removes the mesos rpm (or shared library):
mesos-containerizer: error while loading shared libraries: libmesos-0.20.0-jyu9.so: cannot open shared object file: No such file or directory
That's gonna cause some strange error messages being printed out because the isolators always assume the pid exists when calling 'isolate()'.