Repository: pytorch
Issue: [dynamo] Module tracker test errors in dynamo at runtime
Labels: triaged,oncall: pt2,module: dynamo

Discovered with https://github.com/pytorch/pytorch/pull/126341.

Repro command: `PYTORCH_TEST_WITH_DYNAMO=1 pytest test/test_module_tracker.py::TestModuleTracker::test_module_hierarchy`

Logs:
```
Traceback (most recent call last):
  File "/data/users/williamwen/pytorch2/torch/_dynamo/backends/debugging.py", line 33, in inner
    return gm(*args)
  File "/data/users/williamwen/pytorch2/torch/nn/modules/module.py", line 1532, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
  File "/data/users/williamwen/pytorch2/torch/nn/modules/module.py", line 1595, in _call_impl
    hook_result = hook(self, args, result)
  File "/data/users/williamwen/pytorch2/torch/utils/module_tracker.py", line 125, in _fw_post_hook
    self._get_pop_fn(name, False)()
  File "/data/users/williamwen/pytorch2/torch/utils/module_tracker.py", line 108, in fn
    raise RuntimeError(
RuntimeError: The Module hierarchy tracking is wrong. Report a bug to PyTorch

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/data/users/williamwen/py310-env/lib/python3.10/unittest/case.py", line 59, in testPartExecutor
    yield
  File "/data/users/williamwen/py310-env/lib/python3.10/unittest/case.py", line 591, in run
    self._callTestMethod(testMethod)
  File "/data/users/williamwen/py310-env/lib/python3.10/unittest/case.py", line 549, in _callTestMethod
    method()
  File "/data/users/williamwen/pytorch2/torch/testing/_internal/common_utils.py", line 2756, in wrapper
    method(*args, **kwargs)
  File "/data/users/williamwen/pytorch2/test/test_module_tracker.py", line 38, in test_module_hierarchy
    mod({"a": torch.randn(10, 10, requires_grad=True).clone()})[
  File "/data/users/williamwen/pytorch2/torch/nn/modules/module.py", line 1532, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
  File "/data/users/williamwen/pytorch2/torch/nn/modules/module.py", line 1582, in _call_impl
    result = forward_call(*args, **kwargs)
  File "/data/users/williamwen/pytorch2/test/test_module_tracker.py", line 32, in forward
    x = self.c[0](x)
  File "/data/users/williamwen/pytorch2/torch/nn/modules/module.py", line 1532, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
  File "/data/users/williamwen/pytorch2/torch/nn/modules/module.py", line 1582, in _call_impl
    result = forward_call(*args, **kwargs)
  File "/data/users/williamwen/pytorch2/test/test_module_tracker.py", line 16, in forward
    def forward(self, x):
  File "/data/users/williamwen/pytorch2/torch/_dynamo/eval_frame.py", line 548, in _fn
    return fn(*args, **kwargs)
  File "/data/users/williamwen/pytorch2/torch/_dynamo/backends/debugging.py", line 36, in inner
    raise torch._dynamo.exc.TorchDynamoException(
torch._dynamo.exc.TorchDynamoException: Unexpected exception when running generated GraphModule
```

cc @ezyang @msaroufim @bdhirsh @anijain2305 @chauhang @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @chenyang78 @kadeng @albanD