Apply by doing:
       cd /usr/src
       patch -p0 < 003_vnode.patch

Then build and install a new kernel.

Index: sys/kern/spec_vnops.c
===================================================================
RCS file: /vol/openbsd/cvs/src/sys/kern/spec_vnops.c,v
retrieving revision 1.74
diff -u -p -r1.74 spec_vnops.c
--- sys/kern/spec_vnops.c       9 Jul 2013 15:37:43 -0000       1.74
+++ sys/kern/spec_vnops.c       8 Nov 2013 14:35:18 -0000
@@ -472,10 +472,11 @@ int
spec_close(void *v)
{
       struct vop_close_args *ap = v;
+       struct proc *p = ap->a_p;
       struct vnode *vp = ap->a_vp;
       dev_t dev = vp->v_rdev;
       int (*devclose)(dev_t, int, int, struct proc *);
-       int mode, error;
+       int mode, relock, error;

       switch (vp->v_type) {

@@ -541,7 +542,14 @@ spec_close(void *v)
               panic("spec_close: not special");
       }

-       return ((*devclose)(dev, ap->a_fflag, mode, ap->a_p));
+       /* release lock if held and this isn't coming from vclean() */
+       relock = VOP_ISLOCKED(vp) && !(vp->v_flag & VXLOCK);
+       if (relock)
+               VOP_UNLOCK(vp, 0, p);
+       error = (*devclose)(dev, ap->a_fflag, mode, p);
+       if (relock)
+               vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+       return (error);
}

int

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