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Index: sys/vm/vm_map.c
diff -u sys/vm/vm_map.c:1.187.2.12 sys/vm/vm_map.c:1.187.2.13
--- sys/vm/vm_map.c:1.187.2.12 Sat Nov 10 16:27:09 2001
+++ sys/vm/vm_map.c Fri Mar 8 11:22:20 2002
@@ -1741,8 +1741,11 @@
* to write out.
* We invalidate (remove) all pages from the address space
* anyway, for semantic correctness.
+ *
+ * note: certain anonymous maps, such as MAP_NOSYNC maps,
+ * may start out with a NULL object.
*/
- while (object->backing_object) {
+ while (object && object->backing_object) {
object = object->backing_object;
offset += object->backing_object_offset;
if (object->size < OFF_TO_IDX( offset + size))
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