D20711.diff
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	Index: head/sys/vm/vm_map.c
	===================================================================
	--- head/sys/vm/vm_map.c
	+++ head/sys/vm/vm_map.c
	@@ -2472,11 +2472,8 @@

	VM_MAP_RANGE_CHECK(map, start, end);

	- if (vm_map_lookup_entry(map, start, &entry)) {
	- vm_map_clip_start(map, entry, start);
	- } else {
	+ if (!vm_map_lookup_entry(map, start, &entry))
	entry = entry->next;
	- }

	/*
	* Make a first pass to check for protection violations.
	@@ -2515,6 +2512,7 @@
	* now will do cow due to allowed write (e.g. debugger sets
	* breakpoint on text segment)
	*/
	+ vm_map_clip_start(map, entry, start);
	for (current = entry; current->start < end; current = current->next) {

	vm_map_clip_end(map, current, end);