@chenhaha sadly no real progress.
After communicating back and forth with apple, and providing packet captures, they still need more from me. Unfortunately, I left the company and lost the VPN access. Only if they had replied to me a little sooner...
wangcheng
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There is a faster script to reproduce the leaking. I reported a deadlock issue on https://developer.apple.com/forums/thread/702174.
It turns out that that script is also leaking IOGPUResource.