qprocess problem

hi dear
i have created a object using the QProcess for creating a process.
i am starting the process again and again by giving different arguments. but before starting the process i am killing the previous one as well.
bur after some (may be 12 ) no of times it is giving me a peculiar problem as below..

Qsocketnotifier: Socket descriptor too large for select()
: Internal error

Can anybody throw any light what might be the proble..
byee

How do you kill the previous process and what do you do with QProcess object that was supervising it?