ComfyUI Local Deploy Crash: Minimax H3 Fails with Access Violation After PyTorch Upgrade

shadowmancer404 · reddit · 2026-08-06

A user encountered a severe crash while running the Minimax H3 model using native ComfyUI nodes on Windows 11.

Symptoms: After upgrading PyTorch to use Sage attention 2, the first video generation succeeds, but reloading the CLIP/text encoder for a second prompt triggers a Windows access violation (0xC0000005), crashing the entire ComfyUI backend process.
Environment: RTX 3060 (12GB VRAM), PyTorch 2.7.1+cu128.
Troubleshooting: The user attempted reinstalling PyTorch, updating GPU drivers, and disabling pinned memory and mmap. While disabling pinned memory fixed similar crashes for other models (like FLOW/Lumina2), it did not resolve the issue for Minimax H3.

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