Unpredictably creates independent child processes

[mvcrc]

Killing instance does not kill child processes. They are even more resource intensive than process itself.

[bradgreens]

+1. Terminations should be cascading.

[lucaswerkmeister]

Please clarify: Are you using SIGKILL or SIGTERM?
If child processes are not killed when you kill an instance with SIGKILL, then I'm afraid that's an OS bug or missing feature that we can't implement here.
In case you used SIGKILL: Have you tried sending SIGTERM to the instance instead? Maybe it'll clean up after itself...