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Not just WaitLSNState.waitersHeap, but also WaitLSNState.procInfos and updating of WaitLSNState.minWaitedLSN is protected by WaitLSNLock. There is one now documented exclusion on fast-path checking of WaitLSNProcInfo.inHeap flag. Discussion: https://postgr.es/m/202404030658.hhj3vfxeyhft%40alvherre.pgsql