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This reverts commit 6e2abb2b13af5dff5d631fb1bc0c279c49ebd066.
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This commit improves async op sanitizer speed by only delaying metrics
collection if there are pending ops. This
results in a speedup of around 30% for small CPU bound unit tests.
It performs this check and possible delay on every collection now,
fixing an issue with parent test leaks into steps.
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The fix for #20188 was not entirely correct -- we were unlocking the
global buffer incorrectly. This PR introduces a lock state that ensures
we only unlock a lock we have taken out.
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Reported in #20188
This was caused by re-use of a global buffer `BUF` during simultaneous
async reads.
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