D23222.diff
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	Index: sys/vm/swap_pager.c
	===================================================================
	--- sys/vm/swap_pager.c
	+++ sys/vm/swap_pager.c
	@@ -424,6 +424,11 @@
	static int swapoff_one(struct swdevt sp, struct ucred cred);

	/*
	+ * Swap swdevt functions
	+ */
	+static bool swp_swdevt_available(struct swdevt *sp, int npages);
	+
	+/*
	* Swap bitmap functions
	*/
	static void swp_pager_freeswapspace(daddr_t blk, daddr_t npages);
	@@ -734,6 +739,16 @@
	object->type = OBJT_DEAD;
	}

	+static bool
	+swp_swdevt_available(struct swdevt *sp, int npages)
	+{
	+
	+ if (sp->sw_flags & SW_CLOSING)
	+ return (false);
	+ return (sp->sw_nblks - howmany(BBSIZE, PAGE_SIZE) - sp->sw_used >=
	+ npages );
	+}
	+
	/************************************************************************
	* SWAP PAGER BITMAP ROUTINES *
	************************************************************************/
	@@ -768,7 +783,7 @@
	while (!TAILQ_EMPTY(&swtailq)) {
	if (sp == NULL)
	sp = TAILQ_FIRST(&swtailq);
	- if ((sp->sw_flags & SW_CLOSING) == 0)
	+ if (swp_swdevt_available(sp, npages))
	blk = blist_alloc(sp->sw_blist, &npages, mpages);
	if (blk != SWAPBLK_NONE)
	break;