diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c
index dc7de20..78cd416 100644
*** a/src/backend/replication/slot.c
--- b/src/backend/replication/slot.c
*************** ReplicationSlotAcquire(const char *name)
*** 358,364 ****
  	if (active_pid != MyProcPid)
  		ereport(ERROR,
  				(errcode(ERRCODE_OBJECT_IN_USE),
! 				 errmsg("replication slot \"%s\" is active for PID %d",
  						name, active_pid)));

  	/* We made this slot active, so it's ours now. */
--- 358,364 ----
  	if (active_pid != MyProcPid)
  		ereport(ERROR,
  				(errcode(ERRCODE_OBJECT_IN_USE),
! 				 errmsg("replication slot \"%s\" is active for PID %d (acq)",
  						name, active_pid)));

  	/* We made this slot active, so it's ours now. */
*************** ReplicationSlotRelease(void)
*** 391,396 ****
--- 391,398 ----
  		 * Mark persistent slot inactive.  We're not freeing it, just
  		 * disconnecting.
  		 */
+ 		pg_usleep(100000);
+ 		elog(LOG, "ReplicationSlotRelease: unmarking persistent slot");
  		SpinLockAcquire(&slot->mutex);
  		slot->active_pid = 0;
  		SpinLockRelease(&slot->mutex);
*************** ReplicationSlotDropPtr(ReplicationSlot *
*** 523,528 ****
--- 525,532 ----
  	{
  		bool		fail_softly = slot->data.persistency != RS_PERSISTENT;

+ 		pg_usleep(100000);
+ 		elog(LOG, "ReplicationSlotDropPtr: unmarking slot after rename fail");
  		SpinLockAcquire(&slot->mutex);
  		slot->active_pid = 0;
  		SpinLockRelease(&slot->mutex);
*************** ReplicationSlotDropPtr(ReplicationSlot *
*** 540,545 ****
--- 544,551 ----
  	 * and nobody can be attached to this slot and thus access it without
  	 * scanning the array.
  	 */
+ 	pg_usleep(100000);
+ 	elog(LOG, "ReplicationSlotDropPtr: unmarking slot");
  	LWLockAcquire(ReplicationSlotControlLock, LW_EXCLUSIVE);
  	slot->active_pid = 0;
  	slot->in_use = false;
*************** restart:
*** 876,882 ****
  		if (active_pid)
  			ereport(ERROR,
  					(errcode(ERRCODE_OBJECT_IN_USE),
! 					 errmsg("replication slot \"%s\" is active for PID %d",
  							slotname, active_pid)));

  		/*
--- 882,888 ----
  		if (active_pid)
  			ereport(ERROR,
  					(errcode(ERRCODE_OBJECT_IN_USE),
! 					 errmsg("replication slot \"%s\" is active for PID %d (drop)",
  							slotname, active_pid)));

  		/*