D25283.diff
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	Index: head/sys/vm/vm_map.c
	===================================================================
	--- head/sys/vm/vm_map.c
	+++ head/sys/vm/vm_map.c
	@@ -2379,6 +2379,11 @@
	{
	vm_map_entry_t new_entry;

	+ if (!map->system_map)
	+ WITNESS_WARN(WARN_GIANTOK \| WARN_SLEEPOK, NULL,
	+ "%s: map %p entry %p start 0x%jx", __func__, map, entry,
	+ (uintmax_t)start);
	+
	if (start <= entry->start)
	return;

	@@ -2409,6 +2414,11 @@
	{
	vm_map_entry_t entry;

	+ if (!map->system_map)
	+ WITNESS_WARN(WARN_GIANTOK \| WARN_SLEEPOK, NULL,
	+ "%s: map %p start 0x%jx prev %p", __func__, map,
	+ (uintmax_t)start, prev_entry);
	+
	if (vm_map_lookup_entry(map, start, prev_entry)) {
	entry = *prev_entry;
	vm_map_clip_start(map, entry, start);
	@@ -2430,6 +2440,11 @@
	{
	vm_map_entry_t new_entry;

	+ if (!map->system_map)
	+ WITNESS_WARN(WARN_GIANTOK \| WARN_SLEEPOK, NULL,
	+ "%s: map %p entry %p end 0x%jx", __func__, map, entry,
	+ (uintmax_t)end);
	+
	if (end >= entry->end)
	return;

	@@ -3725,6 +3740,7 @@
	vm_map_entry_t entry, next_entry;

	VM_MAP_ASSERT_LOCKED(map);
	+
	if (start == end)
	return (KERN_SUCCESS);