always a good idea to drop the lock when you're done.

src/lib9/_p9proc.c

@@ -59,6 +59,7 @@ _p9uproc(int inhandler)
 		if(alluproc[h]==T || alluproc[h]==nil){
 			alluproc[h] = up;
 			allupid[h] = pid;
+			unlock(&uproclock);
 			return up;
 		}
 		if(++h == PIDHASH)

src/lib9/mkfile

@@ -141,6 +141,7 @@ LIB9OFILES=\
 	tas-$OBJTYPE.$O\
 	time.$O\
 	tokenize.$O\
+	truerand.$O\
 	u16.$O\
 	u32.$O\
 	u64.$O\