[pull] master from comfyanonymous:master#323
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pull[bot] merged 2 commits intocode:masterfrom Oct 2, 2025
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When the VAE catches this VRAM OOM, it launches the fallback logic straight from the exception context. Python however refs the entire call stack that caused the exception including any local variables for the sake of exception report and debugging. In the case of tensors, this can hold on the references to GBs of VRAM and inhibit the VRAM allocated from freeing them. So dump the except context completely before going back to the VAE via the tiler by getting out of the except block with nothing but a flag. The greately increases the reliability of the tiler fallback, especially on low VRAM cards, as with the bug, if the leak randomly leaked more than the headroom needed for a single tile, the tiler would fallback would OOM and fail the flow.
If this suffers an exception (such as a VRAM oom) it will leave the encode() and decode() methods which skips the cleanup of the WAN feature cache. The comfy node cache then ultimately keeps a reference this object which is in turn reffing large tensors from the failed execution. The feature cache is currently setup at a class variable on the encoder/decoder however, the encode and decode functions always clear it on both entry and exit of normal execution. Its likely the design intent is this is usable as a streaming encoder where the input comes in batches, however the functions as they are today don't support that. So simplify by bringing the cache back to local variable, so that if it does VRAM OOM the cache itself is properly garbage when the encode()/decode() functions dissappear from the stack.
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