Apply by doing:
       cd /usr/src
       patch -p0 < 008_sem.patch
And then rebuild your kernel.

Index: sys/kern/sysv_sem.c
===================================================================
RCS file: /cvs/src/sys/kern/sysv_sem.c,v
retrieving revision 1.21
retrieving revision 1.21.2.1
diff -u -p -r1.21 -r1.21.2.1
--- sys/kern/sysv_sem.c 9 Sep 2003 18:57:36 -0000       1.21
+++ sys/kern/sysv_sem.c 20 Nov 2003 23:51:12 -0000      1.21.2.1
@@ -276,7 +276,7 @@ sys___semctl(struct proc *p, void *v, re
       DPRINTF(("call to semctl(%d, %d, %d, %p)\n", semid, semnum, cmd, arg));

       semid = IPCID_TO_IX(semid);
-       if (semid < 0 || semid >= seminfo.semmsl)
+       if (semid < 0 || semid >= seminfo.semmni)
               return (EINVAL);

       if ((semaptr = sema[semid]) == NULL ||
@@ -531,7 +531,7 @@ sys_semop(struct proc *p, void *v, regis

       semid = IPCID_TO_IX(semid);     /* Convert back to zero origin */

-       if (semid < 0 || semid >= seminfo.semmsl)
+       if (semid < 0 || semid >= seminfo.semmni)
               return (EINVAL);

       if ((semaptr = sema[semid]) == NULL ||