Fixes#152985
In #152985, users are confused why weights-only load failed even though functions were registered in safe_globals.
Because the error message doesn't make the critical failure reason clear, they couldn't figure out only some functions are missing from safe_globals registration.
This fix is to make that point more clear.
Here's the new errror message, the blocked function information will be following the warning message with a line breaker to make it stand out.
```
_pickle.UnpicklingError: Weights only load failed. In PyTorch 2.6, we changed the default value of the `weights_only` argument in `torch.load` from `False` to `True`. Re-running `torch.load` with `weights_only` set to `False` will likely succeed, but it can result in arbitrary code execution. Do it only if you got the file from a trusted source.
Please file an issue with the following so that we can make `weights_only=True` compatible with your use case: WeightsUnpickler error:
Trying to call reduce for unrecognized function <built-in method _unpickle of type object at 0x641e8a57d1f0> which belongs to <class 'zoneinfo.ZoneInfo'>
Check the documentation of torch.load to learn more about types accepted by default with weights_only https://pytorch.org/docs/stable/generated/torch.load.html.
To execute this test, run the following from the base repo dir:
python test/test_serialization.py TestSerialization.test_weights_only_with_safe_zoneinfo_unpickle_registration_success
This message can be suppressed by setting PYTORCH_PRINT_REPRO_ON_FAILURE=0
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/159935
Approved by: https://github.com/mikaylagawarecki
a354fa91e2