LLMWildling/gemma-4-80b-a8b-coder issue with chat completion

#1
by jaminy77 - opened

Hi,

I started this model with vLLM using the exact command provided in the model card:

vllm serve /ailab/vllm/models/gemma-4-80b-a8b-coder --served-model-name vllm/doobee --host 0.0.0.0 --port 23333 --dtype bfloat16 --tensor-parallel-size 1 --enable-expert-parallel --max-model-len 200000 --gpu-memory-utilization 0.96 --trust-remote-code --reasoning-parser gemma4 --tool-call-parser gemma4 --enable-auto-tool-choice --default-chat-template-kwargs '{"enable_thinking": true}' --generation-config vllm --language-model-only --skip-mm-profiling --max-num-seqs 1 --max-num-batched-tokens 8192

vLLM starts successfully, but every response consists of gibberish text, for example:

_material_反馈-disk-s-s-s-0-vector-vector-s-ve-version-v-v-s-ic-ic-과-ve-v-s-bed-s-ota-ton-i-f-target--시기-s-0-vector-v-s-ve-version-v-v-s-ic-ic-target--4-s-held-s-led-1-s-educ-red-red-red-empty-s-1-s-side-as-s-bed-os-ota-ton-i-f-target--시기-s-0-vector-v-s-ve-version-v-s-ic-ic-target--4-s-held-led-1-s-educ-red-red-red-empty-s-1-side-s-led-1-1-0-vector-v-s-s-0-vector-od-od-s-1-er-er-s-s- Feedback-disk-s-s-s-0-vector-vector-s-ve-version-v-v-s-ic-ic-target--4-s-held-led-1-s-educ-red-red-red-empty--ss-s-s-side-s-bed-os-s-ota-ton-i- & l-l-l- 完-callback-callback-s-s-0-vector-v-s-s-ve-version-v-s-ic-ic-target--4-s-held-led-1s-educ-red-red-red-empty-ss-s-side-bed-os-s-dot-1-red-feedback-disk-s-s-0-vector-v-vector-s-ve-version-_s-ic-ic-target-***-4 Skheld-https-https-s-s-s-s-0-vector-v-s-s-ve-ผม-M-M-cov-array-array-array-1-1-1-s-1- 0-vector-v-s-s-1-l-1-0-vector-v-s-
https-replace-system-
_וח-array-array-1-s-s-s- * -array-array1-s-ve-com-com-array-111-v-v-1-core-Tiny-Tiny-1 *Review-review-111-configure-system-array-array1-s-ve-com-com-array110-👋-6-0_parameter

I have successfully run other Gemma models on the same environment without any issues, ie LLMWildling/gemma-4-opencoder-40b-a8b-nvfp4 and LLMWildling/gemma-4-opencoder-40b-a8b-nvfp4-v2

Troubleshooting already performed:

  • Re-downloaded the chat_template.jinja file.
  • Tested through LiteLLM Chat, GitHub CLI, and direct Python API calls.

Does anyone have an idea what might be causing this?

GPU: RTX 6000 Blackwell Max-Q 96GB
Tried on vLLM 0.27.1 and vLLM in vllm:latest container 0.26.1rc1.dev608+g99a10304d

Thanks in advance.

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