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vllm - ✅(Solved) Fix [Bug]: Technical Debt - Remove temporary patches of bailing model [1 pull requests, 1 participants]

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vllm-project/vllm#40793•Fetched 2026-04-25 06:04:02
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This issue tracks the technical debt created by temporary patches implemented in our vllm-ascend integration PR for the Baoling 2.6 model. https://github.com/vllm-project/vllm-ascend/pull/8657 These patches were added as emergency workarounds to address problematic code in the upstream vllm framework. This approach is not sustainable and needs to be addressed through proper upstream fixes followed by removal of the temporary patches.

Root Cause

This issue tracks the technical debt created by temporary patches implemented in our vllm-ascend integration PR for the Baoling 2.6 model. https://github.com/vllm-project/vllm-ascend/pull/8657 These patches were added as emergency workarounds to address problematic code in the upstream vllm framework. This approach is not sustainable and needs to be addressed through proper upstream fixes followed by removal of the temporary patches.

Fix Action

Fix / Workaround

Summary

This issue tracks the technical debt created by temporary patches implemented in our vllm-ascend integration PR for the Baoling 2.6 model. https://github.com/vllm-project/vllm-ascend/pull/8657 These patches were added as emergency workarounds to address problematic code in the upstream vllm framework. This approach is not sustainable and needs to be addressed through proper upstream fixes followed by removal of the temporary patches.

Background

In our vllm-ascend integration PR, we had to introduce several patches to work around issues in the upstream vllm framework that were causing problems with Ascend hardware compatibility. While these patches allowed us to proceed with the integration, they represent technical debt that compromises code maintainability and creates potential future maintenance issues.

Current State

  • Temporary patches have been applied to work around upstream vllm framework issues
  • The patches are not ideal long-term solutions
  • Code maintainability is reduced due to workarounds
  • Future updates from upstream vllm may break our patches

PR fix notes

PR #8657: [Attention][Feature] adapt bailing_moe_linear on Ascend

Description (problem / solution / changelog)

Note

This PR will be removed in the near future, and this issue will track the progress: https://github.com/vllm-project/vllm-ascend/issues/8677

What this PR does / why we need it?

Adapt BaLing 2.5/2.6 series models:

  1. Aligned pagesize padding between linear attention and MLA
  2. Fixed NPU incompatibility in upstream vLLM lightning_attn implementation:
    • Resolved UB overflow issues
    • Optimized tiling strategy and Triton kernel implementation for better performance

Does this PR introduce any user-facing change?

No

How was this patch tested?

ling-2.6-flash

# High concurrency GSM8K evaluation
evalscope eval \
  --model auto \
  --model-id auto \
  --datasets gsm8k \
  --dataset-dir /datasets/gsm8k\
  --chat-template true \
  --api-url http://localhost:${PORT}/v1\
  --eval-batch-size 32
<img width="607" height="92" alt="image" src="https://github.com/user-attachments/assets/8971cd78-855b-4bb6-9794-1bd5d113424e" />

Changed files

  • vllm_ascend/ops/layernorm.py (modified, +12/-2)
  • vllm_ascend/ops/triton/fla/layernorm_guard.py (modified, +1/-0)
  • vllm_ascend/ops/triton/mamba/lightning_attn.py (added, +615/-0)
  • vllm_ascend/ops/triton/mamba/linear_attn.py (added, +187/-0)
  • vllm_ascend/patch/platform/patch_mamba_config.py (modified, +38/-7)
  • vllm_ascend/patch/worker/__init__.py (modified, +1/-0)
  • vllm_ascend/patch/worker/patch_bailing_moe_linear.py (added, +134/-0)
  • vllm_ascend/platform.py (modified, +25/-0)
  • vllm_ascend/worker/model_runner_v1.py (modified, +21/-7)
RAW_BUFFERClick to expand / collapse

🚀 The feature, motivation and pitch

Summary

This issue tracks the technical debt created by temporary patches implemented in our vllm-ascend integration PR for the Baoling 2.6 model. https://github.com/vllm-project/vllm-ascend/pull/8657 These patches were added as emergency workarounds to address problematic code in the upstream vllm framework. This approach is not sustainable and needs to be addressed through proper upstream fixes followed by removal of the temporary patches.

Background

In our vllm-ascend integration PR, we had to introduce several patches to work around issues in the upstream vllm framework that were causing problems with Ascend hardware compatibility. While these patches allowed us to proceed with the integration, they represent technical debt that compromises code maintainability and creates potential future maintenance issues.

Current State

  • Temporary patches have been applied to work around upstream vllm framework issues
  • The patches are not ideal long-term solutions
  • Code maintainability is reduced due to workarounds
  • Future updates from upstream vllm may break our patches

Alternatives

No response

Additional context

No response

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extent analysis

TL;DR

The most likely fix involves removing temporary patches in the vllm-ascend integration and replacing them with proper upstream fixes for the vllm framework.

Guidance

  • Identify and prioritize the upstream vllm framework issues that the temporary patches are addressing, to ensure that fixes are targeted and effective.
  • Engage with the upstream vllm framework maintainers to contribute fixes or wait for their resolution, ensuring compatibility with Ascend hardware.
  • Remove temporary patches from the vllm-ascend integration once upstream fixes are available, to improve code maintainability and reduce technical debt.
  • Monitor future updates from the upstream vllm framework to promptly address any compatibility issues that may arise.

Notes

The success of this approach depends on the responsiveness of the upstream vllm framework maintainers and the complexity of the issues being addressed. It may be necessary to balance the need for proper fixes with the urgency of maintaining a functional integration.

Recommendation

Apply workaround by prioritizing and addressing upstream issues, as this approach allows for a more sustainable and maintainable solution in the long term, even if it requires more upfront effort and coordination.

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vllm - ✅(Solved) Fix [Bug]: Technical Debt - Remove temporary patches of bailing model [1 pull requests, 1 participants]