Race condition in PersistencySvc::addCnvService

It seems the list of conversion services in PersistencySvc is not thread-safe. We are seeing this in one of the ATLAS trigger jobs:

2024-06-03 02:19:53,440  EventPersistencySvc                          1   0    INFO Added successfully Conversion service:ByteStreamCnvSvc
2024-06-03 02:19:53,440  EventPersistencySvc                          2   1    INFO Cannot add Conversion service of type ByteStreamCnvSvc
2024-06-03 02:19:53,440  EventPersistencySvc                          2   1    INFO Cannot access Conversion service:ByteStreamCnvSvc
2024-06-03 02:19:53,440  DataProxy                                    2   1 WARNING accessData: conversion failed for data object 45903698/EventInfo
 Returning NULL DataObject pointer   

Already by the printouts (from slot 0 and slot 1) you can see that something is going wrong as the service claims to have added the conversion service and then says it cannot.

In addition, I wonder why the failure messages are INFO instead of ERROR.