code: def _test_remote_message_dropped_pickle(self, dst=None):
      if self.rank != 0:
          return
      dst_rank = (
          dst if dst is not None else (self.rank + 1) % self.world_size
      )
      dst_worker = f"worker{dst_rank}"
      # Since we fail python_remote_call messages synchronously, the future
      # corresponding to this remote call will be marked with an error when
      # this function returns.
      rref = rpc.remote(dst_worker, my_sleep_func, args=(1,))
      # Call to ensure pending callbacks are run.
      wait_until_pending_futures_and_users_flushed()
      # Attempt to fork the RRef should raise an error indicating the rpc.remote timeout.
      with self.assertRaisesRegex(RuntimeError, "RRef creation"):
          rref._serialize()
      # Test that using RRef as arg over RPC (which forks) results in the same
      # error
      with self.assertRaisesRegex(RuntimeError, "RRef creation"):
          rpc.rpc_async(dst_worker, add_rref_to_value, args=(rref, 1))
  
imports: import torch
  import time
  import torch.distributed.rpc
  from torch.distributed.rpc.api import _delete_all_user_and_unforked_owner_rrefs
  from torch.testing._internal.dist_utils import dist_init, wait_until_pending_futures_and_users_flushed, wait_until_owners_and_forks_on_rank, worker_name
  from torch.testing._internal.distributed.rpc.rpc_agent_test_fixture import RpcAgentTestFixture
label_desc: Use image node_id 6 for calling the FaultyAgentRpcTest obj's underlying member method code with example usage: obj._test_remote_message_dropped_pickle(dst) without return types