D18058.diff
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	Index: head/sys/kern/subr_blist.c
	===================================================================
	--- head/sys/kern/subr_blist.c
	+++ head/sys/kern/subr_blist.c
	@@ -764,6 +764,8 @@
	/* Discard any candidates that appear before cursor. */
	digit = (cursor / radix) & BLIST_META_MASK;
	mask &= (u_daddr_t)-1 << digit;
	+ if (mask == 0)
	+ return (SWAPBLK_NONE);

	/*
	* If the first try is for a block that includes the cursor, pre-undo