The flush() method on lines 366-379 already catches OSError and ValueError
when calling original_stdout.flush() / original_stderr.flush(), but the
sync_write() method on line 361 and the tqdm branch in write() on line 336
do NOT. On Windows, when ComfyUI is launched as a child process with piped
stdio, certain conditions can leave the underlying handle in a state where
flush() raises OSError [Errno 22] Invalid argument.
Once that happens, the unhandled OSError propagates back through:
print() in any custom node
-> write(message) in this logger wrapper
-> sync_write(message)
-> original_*.flush()
-> OSError [Errno 22]
This kills prompt execution for any custom node that prints during
INPUT_TYPES() or __init__ -- even on a benign log line like
'Dependencies already installed from previous run' in LatentSyncWrapper.
Symptoms users will recognize:
- LatentSync, Sonic, Hallo 2 all failing with [Errno 22] before reading inputs
- 'Logging error' lines spammed throughout the console
- The error in the user's traceback always points back to
prestartup_script.py:361 / app/logger.py:35 super().flush()
Wrapping the flush calls in try/except (OSError, ValueError) -- the
exact same pattern already used in self.flush() on line 378 -- breaks
the cascade. Print failures degrade silently to file-only logging
instead of taking down prompt execution.
Adding the following node packs to the custom node list:
- ComfyUI-Darkroom: 29-node professional color grading & film emulation suite
- ComfyUI-Gemini-Direct: Direct Google Gemini image generation
- ComfyUI-API-Optimizer: API cost tracking and caching
- ComfyUI-Gemini-Conversation-Canvas: Multi-turn conversational image editing
- comfyui-wireless-link-simple: Wireless data transmission nodes
- ComfyUI-Higgsfield-Direct: Direct Higgsfield API integration
All repos are public, have proper __init__.py with NODE_CLASS_MAPPINGS,
and are published on the Comfy Registry under @akurate.
