D16501.diff
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	Index: head/sys/vm/vm_object.c
	===================================================================
	--- head/sys/vm/vm_object.c
	+++ head/sys/vm/vm_object.c
	@@ -2142,8 +2142,9 @@
	next_size >>= PAGE_SHIFT;
	next_pindex = OFF_TO_IDX(prev_offset) + prev_size;

	- if ((prev_object->ref_count > 1) &&
	- (prev_object->size != next_pindex)) {
	+ if (prev_object->ref_count > 1 &&
	+ prev_object->size != next_pindex &&
	+ (prev_object->flags & OBJ_ONEMAPPING) == 0) {
	VM_OBJECT_WUNLOCK(prev_object);
	return (FALSE);
	}