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[None] [doc] Document hang issue caused by UnpicklingError #8049

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kaiyux merged 1 commit into from
Sep 29, 2025
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[None] [doc] Document hang issue caused by UnpicklingError #8049

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8 changes: 8 additions & 0 deletions examples/wide_ep/README.md
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Expand Up @@ -125,6 +125,14 @@ rm -f /dev/shm/moe_shared_l0_lr0_all

**Warning:** Be careful when removing shared memory manually, as this may affect running processes that depend on these shared memory segments.

### Hang issue caused by `UnpicklingError`

It's possible to see hang issue that is caused by an `UnpicklingError`, we've noticed that and recorded it as a known issue. The issue seems to be existing in MPI, because we are not reproducing again after by-passing the MPI route by implementing customized InfiniBand communicator and replacing MPI API calls with that. We did not proceed because:
1. The implementation only works on InfiniBand, hence not general enough.
2. The implementation largely duplicated with InfiniBand communicator implementation in NCCL, which is hard to maintain.

That being said, we are aware of the `UnpicklingError`, but instead of pushing further, we decided to keep observing for a while to see if it would be gone with further 3rd-party dependency upgrade. Please let us know if it's a blocker in your workload, and we will do necessary adjustment based on the feedback.

### Disaggregated serving related issues

Refer to the [Troubleshooting and FAQ](https://github.com/NVIDIA/TensorRT-LLM/blob/main/docs/source/features/disagg-serving.md#troubleshooting-and-faq) section of Disaggregated-Service.
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