D3050.id7614.diff
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	Index: head/sys/geom/geom_dev.c
	===================================================================
	--- head/sys/geom/geom_dev.c
	+++ head/sys/geom/geom_dev.c
	@@ -401,6 +401,20 @@
	#else
	e = 0;
	#endif
	+
	+ /*
	+ * The vgonel(9) - caused by eg. forced unmount of devfs - calls
	+ * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags,
	+ * which would result in zero deltas, which in turn would cause
	+ * panic in g_access(9).
	+ *
	+ * Note that we cannot zero the counters (ie. do "r = cp->acr"
	+ * etc) instead, because the consumer might be opened in another
	+ * devfs instance.
	+ */
	+ if (r + w + e == 0)
	+ return (EINVAL);
	+
	sc = cp->private;
	mtx_lock(&sc->sc_mtx);
	sc->sc_open += r + w + e;