Try reduce vma count on host to prevent panic because of too much mprotect

src/libos/src/vm/vm_manager.rs

@@ -783,6 +783,9 @@ impl InternalVMManager {
         // Remove from chunks
         self.chunks.remove(chunk);
 
+        // Mprotect the whole chunk to reduce the usage of vma count of host
+        VMPerms::apply_perms(range, VMPerms::DEFAULT);
+
         // Add range back to freespace manager
         self.free_manager.add_range_back_to_free_manager(range);
         Ok(())