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[GH-ISSUE #15880] qwen3.6:35b-a3b-nvfp4 1b50c6fdc2d4 gets stuck in thinking loop #72178

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opened 2026-05-05 03:35:48 -05:00 by GiteaMirror · 1 comment
GiteaMirror commented 2026-05-05 03:35:48 -05:00
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Originally created by @xmddmx on GitHub (Apr 29, 2026).
Original GitHub issue: https://github.com/ollama/ollama/issues/15880

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

Originally created by @xmddmx on GitHub (Apr 29, 2026). Original GitHub issue: https://github.com/ollama/ollama/issues/15880 ### 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 ```shell ``` ### OS macOS ### GPU Apple ### CPU Apple ### Ollama version 0.22.0
GiteaMirror added the bug label 2026-05-05 03:35:48 -05:00
GiteaMirror commented 2026-05-05 03:35:50 -05:00
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@ArkaD171717 commented on GitHub (May 1, 2026):

Posted #15902 to address this

<!-- gh-comment-id:4358888497 --> @ArkaD171717 commented on GitHub (May 1, 2026): Posted #15902 to address this
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