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This topic has been translated from a Chinese forum by GPT and might contain errors.Original topic: tidb集群版本由V5.4.0升级到V6.5.0，主从库集群，目前发现有如下问题：
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username: vcdog
[TiDB Usage Environment] Production Environment
[TiDB Version]
[Reproduction Path] What operations were performed when the issue occurred
[Encountered Issues: Issue Phenomenon and Impact]
- When there is TiFlash in the slave cluster and it receives KV data changes sent by CDC from the upstream master cluster, regardless of whether CDC synchronization is done first or TiFlash is loaded first, it will cause TiFlash to crash and generate a large number of core files;
- There is an issue with insufficient permissions for ordinary users logging into the dashboard page in the master cluster.
[Resource Configuration]
[Attachments: Screenshots/Logs/Monitoring]
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