kprocs dont share memory with up, see: http://9fans.net/archive/2011/05/159

sys/src/9/port/proc.c

@@ -1378,13 +1378,14 @@ kproc(char *name, void (*func)(void *), void *arg)
 	memset(p->time, 0, sizeof(p->time));
 	p->time[TReal] = MACHP(0)->ticks;
 	ready(p);
+
 	/*
 	 *  since the bss/data segments are now shareable,
 	 *  any mmu info about this process is now stale
 	 *  and has to be discarded.
-	 */
 	p->newtlb = 1;
 	flushmmu();
+	 */
 }
 
 /*