fix(container): backport vLLM #45022 Voxtral realtime boot fix into the vLLM runtime image by glamr-agent · Pull Request #16190 · ai-dynamo/dynamo

glamr-agent · 2026-10-12T17:20:31Z

Summary

vLLM 0.31.0 registers VoxtralRealtimeGeneration with the base VoxtralProcessingInfo, so engine profiling builds a dummy audio of max_model_len * 1280 samples (167772160 at --max-model-len 131072). The reported mistralai/Voxtral-Mini-4B-Realtime-2602 boot crash (CUBLAS_STATUS_INTERNAL_ERROR in compute_whisper_melspec) happens during that profiling. The upstream fix, vllm-project/vllm#45022 (2186b89a9a), is merged but not in any vLLM release yet, so this PR applies it at image build time and keeps the pin at 0.31.0.

Details:

container/deps/vllm/patches/0001-voxtral-realtime-processing-info-vllm-45022.patch carries the upstream vllm/model_executor/models/voxtral_realtime.py change unchanged. It adds VoxtralRealtimeProcessingInfo, which sizes profiling audio from the streaming prompt (49920 samples), and stops a realtime stream at max_model_len. The upstream connection.py change is not included; Dynamo uses its own realtime connection.
container/templates/vllm_runtime.Dockerfile adds a CUDA-only step after the vLLM-Omni layer. It applies each patch with patch --forward --fuzz=0 to the installed vLLM tree. A later vLLM that already contains the fix fails this step, which signals that the patch and this step should be removed.

On an A100 the unpatched image did not reproduce the cuBLAS error, so the crash fix itself still needs the QA re-run on an image built from this change.

Where should the reviewer start?

container/templates/vllm_runtime.Dockerfile, the new patch step.

Validation

Full CI passed on 5f2951bdfa8967fea39b3f72efcfbbea7b597c4d: PR workflow run. This includes the vLLM runtime, dev, local-dev, and EFA image builds, runtime tests on amd64 and arm64, the amd64 2-GPU test, and all four vLLM deployment tests.
The pre-merge workflow passed on the same head, including pre-commit.
The original cuBLAS crash was not reproduced in the prior A100 validation. QA confirmation on an image containing this change remains outstanding.

Related Issues

Summary by CodeRabbit

Bug Fixes
- Real-time audio updates now process one audio item at a time and stop accepting input when the model’s maximum context length is reached.
- Audio input length accounts for the streaming prompt prefix, helping prevent oversized requests from being processed.
- CUDA runtime builds apply the audio-processing update and fail if it cannot be applied, rather than producing an image without it.

…he vLLM runtime image vLLM 0.31.0 registers VoxtralRealtimeGeneration with the base VoxtralProcessingInfo, so profiling builds a max_model_len * 1280 sample dummy audio and Voxtral-Mini-4B-Realtime-2602 fails at engine startup. No vLLM release contains the upstream fix yet, so apply the model-file part of vllm-project/vllm@2186b89a9a as a build-time patch in CUDA images. Remove the patch when the CUDA vLLM pin contains that commit. Closes DYN-4860 Signed-off-by: svc-glamr@nvidia.com <svc-glamr@nvidia.com>

Signed-off-by: svc-glamr@nvidia.com <svc-glamr@nvidia.com>

copy-pr-bot · 2026-10-12T17:20:36Z

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github-actions · 2026-10-12T17:20:43Z

👋 Hi glamr-agent! Thank you for contributing to ai-dynamo/dynamo.

Just a reminder: The NVIDIA Test Github Validation CI runs an essential subset of the testing framework to quickly catch errors.Your PR reviewers may elect to test the changes comprehensively before approving your changes.

🚀

glamr-agent · 2026-10-12T17:21:26Z

Automated evidence record — validation incomplete

Validation status: incomplete

Evidence summary: [5/6 validated · 1 runs in CI]

AI review assessment (advisory, not an approval): sound

Validation result: incomplete. No Docker daemon was available, so the image build with the new patch step was not run locally. It runs in the vllm-build, vllm-dev-build and vllm-local-dev-build CI jobs. Validator note: with vLLM 0.31.0 and the committed patch step, the Voxtral realtime profiling length changes from 167772160 to 49920 samples. Both upstream max_model_len regression tests fail unpatched and pass patched. Voxtral realtime boots and returns a transcript on an A100. The Qwen3-0.6B smoke passes, and 79 realtime unit tests pass. The A100 did not reproduce the reported CUBLAS_STATUS_INTERNAL_ERROR, so final confirmation is the QA re-run on an image built from this change.

Evidence audit: complete [5/6 validated · 1 runs in CI]. The command report comes from recorded runs.

Commands and results [5/6 validated · 1 runs in CI]

Generated from the commands recorded during this run.

Check 1

Builds the changed Dynamo source and confirms that Python can import its compiled extension.

Result: Passed (exit 0)

Command:

Not shown because the exact command contained private run data.

Check 2

Checks the changed files with the repository's fast lint and formatting commands.

Result: Passed (exit 0)

Command:

Not shown because the exact command contained private run data.

Check 3

Runs the relevant Python unit tests without requiring a GPU.

Result: Passed (exit 0)

Command:

Not shown because the exact command contained private run data.

Check 4

Builds the affected container image and checks its runtime setup.

Result: Not run

Command:

Not run.

Details:

No Docker daemon is available here; the vllm-build job (vllm-runtime, CUDA 13.0, amd64 and arm64) plus vllm-dev-build and vllm-local-dev-build in pr.yaml build the image with the new patch step against the real vllm/vllm-openai:v0.31.0-ubuntu2404 tree.

Check 5

Starts Dynamo with vLLM on one GPU and sends a real request.

Result: Passed (exit 0)

Command:

Not shown because the exact command contained private run data.

Check 6

Runs the relevant GPU-dependent Python tests against the changed source.

Result: Passed (exit 0)

Command:

Not shown because the exact command contained private run data.

coderabbitai · 2026-10-12T17:24:15Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Run ID: 71c7a19c-343d-4f72-99a4-05d517153cd3

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Reviewing files that changed from the base of the PR and between 3615c54 and 5f2951b.

📒 Files selected for processing (2)

container/deps/vllm/patches/0001-voxtral-realtime-processing-info-vllm-45022.patch
container/templates/vllm_runtime.Dockerfile

Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 1 remain after this review.

Walkthrough

The vLLM patch adds Voxtral realtime audio processing limits and stops input generation when cumulative frame tokens reach the configured model length. CUDA image builds apply patch files to the installed vLLM source.

Changes

Voxtral realtime processing

Layer / File(s)	Summary
Voxtral processing and buffer limits `container/deps/vllm/patches/0001-voxtral-realtime-processing-info-vllm-45022.patch`	The patch adds processing information that limits each update to one audio item and calculates audio-array length from the streaming prompt prefix and encoder length per token. The buffer tracks cumulative frame tokens and returns before fetching a frame when the configured model-length limit is reached. Buffer construction passes `model_config.max_model_len`.
CUDA image patch application `container/templates/vllm_runtime.Dockerfile`	CUDA builds apply sorted patch files to the installed vLLM source with forward-only, zero-fuzz options. If needed, the build installs `patch` for the operation and removes it afterward. An empty patch directory or patch failure stops the build.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~15 minutes

Merge Risk: ⚪ Minimal · up to 5f295

CUDA images now patch the installed vLLM package. Voxtral realtime profiling therefore uses streaming-sized dummy audio, and realtime streams stop at the model's maximum length. No outstanding defects were found. Confirm the Voxtral crash fix on a built image as planned.

Pre-merge checks · 5

Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly identifies the container fix, the vLLM backport, and the affected Voxtral realtime boot issue.
Description check		The description explains the problem, implementation, reviewer entry point, validation status, and related issues. It uses a Summary heading instead of the template's Overview heading, but it provides…

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Actionable comments posted: 1

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Inline comments:
Review comments at @container/templates/vllm_runtime.Dockerfile:
- Around line 319-321: Update the patch loop in the CUDA build to fail when
`/tmp/vllm_patches` exists but contains no matching `.patch` files. Check the
expanded glob before iterating, emit an error, and exit nonzero when it matches
nothing; otherwise, apply each patch as before.

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⚙️ Run configuration

Configuration used: Repository: ai-dynamo/dynamo/.coderabbit.yaml
Review profile: CHILL
Plan: Enterprise
Run ID: a866ad4b-5f9a-423c-ac5d-d597a8c1ff83

📥 Commits

Reviewing files that changed from the base of the PR and between 3615c54 and 6f3faa2.

📒 Files selected for processing (2)

container/deps/vllm/patches/0001-voxtral-realtime-processing-info-vllm-45022.patch
container/templates/vllm_runtime.Dockerfile

Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 3 remain after this review.

Signed-off-by: svc-glamr@nvidia.com <svc-glamr@nvidia.com>

glamr-agent · 2026-10-12T17:30:42Z

/devin review

@coderabbitai full review

coderabbitai · 2026-10-12T17:31:03Z

✅ Action performed

Full review finished.

glamr-agent · 2026-10-12T17:31:09Z

factory: @dynamo-ops please run full CI for 5f2951b

dynamo-ops · 2026-10-12T17:31:24Z

/ok to test 5f2951b

devin-ai-integration · 2026-10-12T18:37:32Z

✅ Dynamo PR CI passed — run 38284785659 (attempt 1) on `5f2951bdfa`

Gate checks: ✅ backend-status-check · ✅ deploy-status-check · ✅ dynamo-status-check

_{Posted automatically by Devin for run 38284785659. Updated on every full-CI run of this PR.}

ptarasiewiczNV · 2026-10-13T11:59:07Z

Closing in favor of #16295

glamr-agent added 2 commits October 12, 2026 15:24

chore: remove factory working notes

6f3faa2

Signed-off-by: svc-glamr@nvidia.com <svc-glamr@nvidia.com>

glamr-agent requested review from a team as code owners October 12, 2026 17:20

pull-request-size Bot added the size/L label Oct 12, 2026

glamr-agent temporarily deployed to external_collaborator October 12, 2026 17:20 — with GitHub Actions Inactive

github-actions Bot added fix external-contribution Pull request is from an external contributor backend::vllm Relates to the vllm backend container labels Oct 12, 2026

coderabbitai Bot reviewed Oct 12, 2026

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Comment thread container/templates/vllm_runtime.Dockerfile Outdated

dynamo-review-agent Bot approved these changes Oct 12, 2026

View reviewed changes

fix(container): fail the vLLM patch step when no patch file is present

5f2951b

Signed-off-by: svc-glamr@nvidia.com <svc-glamr@nvidia.com>

glamr-agent temporarily deployed to external_collaborator October 12, 2026 17:30 — with GitHub Actions Inactive

glamr-agent mentioned this pull request Oct 12, 2026

[BUG]: Voxtral realtime startup profiling uses oversized audio with vLLM 0.31.0 #16243

Closed

ptarasiewiczNV closed this Oct 13, 2026

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Commands and results [5/6 validated · 1 runs in CI]

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✅ Dynamo PR CI passed — run 38284785659 (attempt 1) on 5f2951bdfa

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✅ Dynamo PR CI passed — run 38284785659 (attempt 1) on `5f2951bdfa`