One other suggestion - you didn't mention whether you've got NativeIO enabled but toggling it could plausibly fix this issue.
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After disabling native IO, behavior is really weird. Descriptors are still being leaked, but as soon as the number reaches ~47k (we have 65k available), it resets back to around ~10k (as if most of them are garbage collected). And it still crashes later on when cleanup stops working. This kind of behavior I never saw on a linux system...Comment
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