ollama - 💡(How to fix) Fix qwen3.6:35b-a3b-nvfp4 1b50c6fdc2d4 gets stuck in thinking loop [1 participants]

What is the issue?

The following prompt works fine in qwen 3.5:

ollama run qwen3.5:35b-a3b-nvfp4 --verbose "Puzzle game: there are 16 words, grouped into 4 categories, which can include semantic, phonetic, or more tricky (such as adding or removing a letter or word). The 4 categories vary in difficulty, from obvious to obscure. Please tell me the 4 words in each category, and define the category, and list the categories in order from easiest to hardest. Here are the 16 words: calliope superiority ringmaster atlas oedipus buzzard echo electra trace dialect inferiority dictionary thesaurus reminder encyclopedia vestige"

Note: it takes about 10 minutes of thinking on a M4Pro MacBook Pro with 48GB RAM, but it does finish.

The same prompt on qwen3.6 (nvfp4) model, gets stuck in a thinking loop:

ollama run qwen3.6:35b-a3b-nvfp4 --verbose "Puzzle game: there are 16 words, grouped into 4 categories, which can include semantic, phonetic, or more tricky (such as adding or removing a letter or word). The 4 categories vary in difficulty, from obvious to obscure. Please tell me the 4 words in each category, and define the category, and list the categories in order from easiest to hardest. Here are the 16 words: calliope superiority ringmaster atlas oedipus buzzard echo electra trace dialect inferiority dictionary thesaurus reminder encyclopedia vestige"

I see other reports coming in about the nvfp4 version of qwen3.6 having problems, so this may be the same bug? See for example: https://github.com/ollama/ollama/issues/15866

Relevant log output

OS

macOS

GPU

Apple

CPU

Apple

Ollama version

0.22.0