D22324.diff
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	Index: sys/vm/swap_pager.c
	===================================================================
	--- sys/vm/swap_pager.c
	+++ sys/vm/swap_pager.c
	@@ -949,7 +949,7 @@
	}

	/*
	- * Destination has no swapblk and is not resident, transfer source.
	+ * Transfer source.
	* swp_pager_meta_build() can sleep.
	*/
	vm_object_pip_add(srcobject, 1);
	@@ -1117,8 +1117,9 @@
	swap_pager_unswapped(vm_page_t m)
	{
	struct swblk *sb;
	+ bool locked;

	- VM_OBJECT_ASSERT_WLOCKED(m->object);
	+ VM_OBJECT_ASSERT_LOCKED(m->object);

	/*
	* The meta data only exists if the object is OBJT_SWAP
	@@ -1133,9 +1134,14 @@
	return;
	if (sb->d[m->pindex % SWAP_META_PAGES] == SWAPBLK_NONE)
	return;
	+ locked = VM_OBJECT_WOWNED(m->object);
	+ if (!locked && !VM_OBJECT_TRYUPGRADE(m->object))
	+ return;
	swp_pager_freeswapspace(sb->d[m->pindex % SWAP_META_PAGES], 1);
	sb->d[m->pindex % SWAP_META_PAGES] = SWAPBLK_NONE;
	swp_pager_free_empty_swblk(m->object, sb);
	+ if (!locked)
	+ VM_OBJECT_LOCK_DOWNGRADE(m->object);
	}

	/*
	Index: sys/vm/vm_fault.c
	===================================================================
	--- sys/vm/vm_fault.c
	+++ sys/vm/vm_fault.c
	@@ -273,7 +273,7 @@
	vm_page_dirty(m);
	if (!excl)
	vm_page_unlock(m);
	- else if (need_dirty)
	+ if (need_dirty)
	vm_pager_page_unswapped(m);
	}