Bugfix: Butex returned to ObjectPool triggers use-after-poison

[chenBright]

What problem does this PR solve?

Issue Number:

Problem Summary:

What is changed and the side effects?

Changed:

Butex object returned to the ObjectPool<Butex> may be accessed, so ObjectPool<Butex> can not poison the memory region of Butex.

Side effects:

• Performance effects:

• Breaking backward compatibility:

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