Users report Qwen3.8 outputting garbage after prolonged use

trashacct383 · reddit · 2026-08-27

A user reports that Qwen3.8-27B-FP8 starts outputting nonsense or garbage after a few hours of use on vLLM, requiring a restart to fix. The user provided detailed configuration flags (including FlashInfer backend, xgrammar, MTP speculative decoding) and noted that adding a repetition penalty helped slightly, but vLLM 28 seemed to worsen the issue, asking if others are experiencing the same.

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