D21517.id61651.diff
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D21517.id61651.diff
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	Index: sys/vm/vm_map.c
	===================================================================
	--- sys/vm/vm_map.c
	+++ sys/vm/vm_map.c
	@@ -2771,6 +2771,17 @@
	if (current->eflags & MAP_ENTRY_IS_SUB_MAP)
	continue;

	+ /*
	+ * MADV_FREE would otherwise rewind time to the creation of the
	+ * shadow object. Because we hold the VM map read-locked,
	+ * neither the entry's object nor the presence of a backing
	+ * object can change.
	+ */
	+ if (behav == MADV_FREE &&
	+ current->object.vm_object != NULL &&
	+ current->object.vm_object->backing_object != NULL)
	+ continue;
	+
	pstart = OFF_TO_IDX(current->offset);
	pend = pstart + atop(current->end - current->start);
	useStart = current->start;