UpscalerSeedVR.load_model() rebinds the module-global
generation.generation_step (called by name inside generation_loop) to
the instance's model_step wrapper, keeping the previous value to call
back into. That global was never restored, so the second pass through
load_model() saved the wrapper itself as the "original", making
model_step() call itself -> RecursionError.
The second pass is reached on any model (re)load: with upscaler_unload
enabled (self.model reset to None after each run) every subsequent run
recurses, and switching SeedVR variants (self.model_loaded != model_name)
triggers it even without unload.
Stash the pristine generation_step on the module once and have the
wrapper call that, so repeated loads never wrap the wrapper.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Vladimir Mandic
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