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Before commit a0e0fb1ba56f, multixact.c contained a case in the multixact-read path where it would loop sleeping 1ms each time until another multixact-create path completed, which was uncovered by any tests. That commit changed the code to rely on a condition variable instead. Add a test now, which relies on injection points and "loading" thereof (because of it being in a critical section), per commit 4b211003ecc2. Author: Andrey Borodin <x4mmm@yandex-team.ru> Reviewed-by: Michaël Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/0925F9A9-4D53-4B27-A87E-3D83A757B0E0@yandex-team.ru