Patch from Thomas Gleixner <tglx@linutronix.de> to do

automatic child reaping to avoid zombies

init/init.c

@@ -1061,6 +1061,7 @@ extern int init_main(int argc, char **argv)
 	signal(SIGCONT, cont_handler);
 	signal(SIGSTOP, stop_handler);
 	signal(SIGTSTP, stop_handler);
+	signal(SIGCHLD, SIG_IGN);
 
 	/* Turn off rebooting via CTL-ALT-DEL -- we get a 
 	 * SIGINT on CAD so we can shut things down gracefully... */