D14685.diff
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	Index: head/sys/dev/md/md.c
	===================================================================
	--- head/sys/dev/md/md.c
	+++ head/sys/dev/md/md.c
	@@ -1750,13 +1750,24 @@
	strlen(sc->file) + 1);
	return (error);
	case MDIOCLIST:
	+ /*
	+ * Write the number of md devices to mdio->md_pad[0].
	+ * Write the unit number of the first (MDNPAD - 2) units
	+ * to mdio->md_pad[1::(MDNPAD - 2)] and terminate the
	+ * list with -1.
	+ *
	+ * XXX: There is currently no mechanism to retrieve unit
	+ * numbers for more than (MDNPAD - 2) units.
	+ *
	+ * XXX: Due to the use of LIST_INSERT_HEAD in mdnew(), the
	+ * list of visible unit numbers not stable.
	+ */
	i = 1;
	LIST_FOREACH(sc, &md_softc_list, list) {
	- if (i == MDNPAD - 1)
	- mdio->md_pad[i] = -1;
	- else
	+ if (i < MDNPAD - 1)
	mdio->md_pad[i++] = sc->unit;
	}
	+ mdio->md_pad[MIN(i, MDNPAD - 1)] = -1;
	mdio->md_pad[0] = i - 1;
	return (0);
	default: