Hi,
I have an application which has a main process, and worker processes that are created on demand. The application uses 
the "report for work" paradigm, where the workers do a MsgSend to the main process when they are ready, and the main 
process does a MsgReply when there is work to do. This application runs for weeks/months at a time with no problems, but
 sometimes a worker process becomes unresponsive. It appears as reply-blocked on the main process as normal, but does 
not activate. What I would like to do in this situation is kill the process, but I can't, even with SIGKILL as root.

What would make a process unkillable? Is there any other way to get rid of it, short of rebooting?

Thanks,
Ned