D35471.diff
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	diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c
	--- a/sys/vm/vm_fault.c
	+++ b/sys/vm/vm_fault.c
	@@ -2099,8 +2099,15 @@
	goto again;
	}
	pmap_copy_page(src_m, dst_m);
	- VM_OBJECT_RUNLOCK(object);
	+
	+ /*
	+ * The object lock does not guarantee that "src_m" will
	+ * transition from invalid to valid, but it does ensure
	+ * that "src_m" will not transition from valid to
	+ * invalid.
	+ */
	dst_m->dirty = dst_m->valid = src_m->valid;
	+ VM_OBJECT_RUNLOCK(object);
	} else {
	dst_m = src_m;
	if (vm_page_busy_acquire(dst_m, VM_ALLOC_WAITFAIL) == 0)