D25828.diff
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	Index: head/sys/vm/vm_page.c
	===================================================================
	--- head/sys/vm/vm_page.c
	+++ head/sys/vm/vm_page.c
	@@ -1371,9 +1371,14 @@

	KASSERT(vm_page_none_valid(m), ("page %p is valid", m));
	KASSERT(!pmap_page_is_mapped(m), ("page %p is mapped", m));
	- vm_page_assert_xbusied(m);
	KASSERT(m->object != NULL, ("page %p has no object", m));
	VM_OBJECT_ASSERT_WLOCKED(m->object);
	+
	+ /*
	+ * We may be attempting to free the page as part of the handling for an
	+ * I/O error, in which case the page was xbusied by a different thread.
	+ */
	+ vm_page_xbusy_claim(m);

	/*
	* If someone has wired this page while the object lock