Hi, Since v3 no longer applied cleanly due to conflicts, I rebased it onto current master at 061065e28f0. Attached is v4.
Regards, Chee Wooson
v4-0001-Wait-for-updaters-still-in-progress-when-checking.patch
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v4-0002-Judge-a-finished-multixact-updater-by-commit-stat.patch
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v4-0003-Test-abort-window-conflicts-and-crashed-multixact.patch
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