D23299.id67210.diff
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D23299.id67210.diff
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	Index: head/sys/vm/vm_map.c
	===================================================================
	--- head/sys/vm/vm_map.c
	+++ head/sys/vm/vm_map.c
	@@ -2477,19 +2477,12 @@
	vm_map_unlock(submap);

	vm_map_lock(map);
	-
	VM_MAP_RANGE_CHECK(map, start, end);
	-
	- if (vm_map_lookup_entry(map, start, &entry)) {
	+ if (vm_map_lookup_entry(map, start, &entry) && entry->end >= end &&
	+ (entry->eflags & MAP_ENTRY_COW) == 0 &&
	+ entry->object.vm_object == NULL) {
	vm_map_clip_start(map, entry, start);
	- } else
	- entry = vm_map_entry_succ(entry);
	-
	- vm_map_clip_end(map, entry, end);
	-
	- if ((entry->start == start) && (entry->end == end) &&
	- ((entry->eflags & MAP_ENTRY_COW) == 0) &&
	- (entry->object.vm_object == NULL)) {
	+ vm_map_clip_end(map, entry, end);
	entry->object.sub_map = submap;
	entry->eflags \|= MAP_ENTRY_IS_SUB_MAP;
	result = KERN_SUCCESS;