D20893.diff
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	Index: head/sys/kern/subr_blist.c
	===================================================================
	--- head/sys/kern/subr_blist.c
	+++ head/sys/kern/subr_blist.c
	@@ -639,15 +639,27 @@
	* bitpos() returns zero here.
	*/
	avail = blk - start + bitpos(~scan->bm_bitmap);
	- if (avail < count) {
	+ if (avail < count \|\| avail == 0) {
	/*
	* There isn't a next leaf with enough free
	- * blocks at its beginning to complete the
	- * spanning allocation.
	+ * blocks at its beginning to bother
	+ * allocating.
	*/
	return (avail);
	}
	maxcount = imin(avail, maxcount);
	+ if (maxcount % BLIST_BMAP_RADIX == 0) {
	+ /*
	+ * There was no next leaf. Back scan up to
	+ * last leaf.
	+ */
	+ --scan;
	+ while (radix != BLIST_BMAP_RADIX) {
	+ radix /= BLIST_META_RADIX;
	+ --scan;
	+ }
	+ blk -= BLIST_BMAP_RADIX;
	+ }
	}
	}