- Document two cases, one in vget and the other in vn_lock, where the state

of interlock on exit is not consistent.  There are probably several bugs
   relating to this.

sys/kern/vfs_subr.c

@@ -1937,6 +1937,7 @@ vget(vp, flags, td)
 		} else {
 			vp->v_iflag |= VI_XWANT;
 			msleep(vp, VI_MTX(vp), PINOD | PDROP, "vget", 0);
+			mp_fixme("interlock not released.");
 			return (ENOENT);
 		}
 	}

sys/kern/vfs_vnops.c

@@ -843,6 +843,7 @@ debug_vn_lock(vp, flags, td, filename, line)
 			vp->v_iflag |= VI_XWANT;
 			msleep(vp, VI_MTX(vp), PINOD | PDROP,
 			    "vn_lock", 0);
+			mp_fixme("interlock not released.");
 			error = ENOENT;
 		} else {
 #if 0