D31312.diff
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	Index: sys/kern/subr_rman.c
	===================================================================
	--- sys/kern/subr_rman.c
	+++ sys/kern/subr_rman.c
	@@ -160,6 +160,11 @@
	rm->rm_descr, start, end));
	if (start < rm->rm_start \|\| end > rm->rm_end)
	return EINVAL;
	+#if defined(INVARIANTS) \|\| defined(_STANDALONE)
	+ if (RMAN_IS_DEFAULT_RANGE(start, end))
	+ printf("ERROR: %s: <%s> attempting to manage default range\n",
	+ __func__, rm->rm_descr);
	+#endif
	r = int_alloc_resource(M_NOWAIT);
	if (r == NULL)
	return ENOMEM;
	@@ -447,6 +452,8 @@
	dev == NULL ? "<null>" : device_get_nameunit(dev)));
	KASSERT((flags & RF_FIRSTSHARE) == 0,
	("invalid flags %#x", flags));
	+ KASSERT(count != 0, ("%s(): attempting to allocate empty range",
	+ __func__));
	new_rflags = (flags & ~RF_FIRSTSHARE) \| RF_ALLOCATED;

	mtx_lock(rm->rm_mtx);