Lennart Augustsson <lennart@augustsson.net> writes:

> enami tsugutomo wrote:
> 
> > For me, it looks like the problem is that kernel reuses pid while it
> > keeps a reference to struct pgrp (or proc) in other place.
> 
> That's indeed the problem.  The question is how you can solve it. :)

Make the kernel
	- not to deallocate struct pgrp (or proc) while someone else
	  refers them.  Remeber it instead.
	- not to reuse pgid (or pid) of such objects as new pid.

enami.