[Bug] 压测cpu 过高，polardb死机

[daqungege]

Describe the bug
压测一段时间后，polardbcpu一直飙升

To Reproduce
Steps to reproduce the behavior:

1. 系统一直请求
2. 过2个小时，polarcpu飙升，
3. 重启polardb恢复正常

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Environment (please complete the following information):

• OS: [e.g. ubuntu 22.04]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[polardb-bot]

Hi @daqungege ~ Thanks for opening this issue! 🎉

Please make sure you have provided enough information for subsequent discussion.

We will get back to you as soon as possible. ❤️

[mrdrivingduck]

@daqungege Can you check with pstack to see what the processes are actually working on?

[daqungege]

@ daqungege您能检查一下pstack，看看这些进程实际上在做什么吗？

麻烦您看下，看样子应该是挂了