[I] 求助：卡死问题排查 (brpc)

[via GitHub]

yyweii opened a new issue, #2552:
URL: https://github.com/apache/brpc/issues/2552

   **Describe the bug (描述bug)**
   
adx服务在启动的时候大概率会出现卡死。vars接口显示创建了大量bthread和channel_connections，并且不断增长，最后导致OOM。如果能成功启动，服务运行还是比较稳定，高峰时bthread最多1800个，channel_connections最多2500个。
   
   
brpc服务接收到请求后会广播给下游dsp。协议基本都是http。我们对每一个dsp请求都会启一个bthread，bthread里同步请求下游服务，设定的超时时间为500ms左右。处理服务请求的bthread会join每个dsp的bthread。
   
   服务最高并发不到100。dsp120个左右。
   
   gdb调试的时候，worker线程堆栈目前看到有两种：
   
   1. worker都在发送dsp请求，暂停在dsp的CallMethod。看堆栈貌似把pthread卡住了
   
![image](https://github.com/apache/brpc/assets/598529/239c9e1b-407c-4315-b13d-8ebc7771c7b1)
   
   2. worker都在建立ssl链接
   
![image](https://github.com/apache/brpc/assets/598529/d62949a9-b234-45d1-a53a-293e57146d2e)
   
   
   有没有排查思路？
   
   **To Reproduce (复现方法)**
   
   
   **Expected behavior (期望行为)**
   
   
   **Versions (各种版本)**
   OS: ubuntu 22.04.3
   Compiler: g++ 11.4
   brpc: 1.6
   protobuf: 3.20.1
   
   **Additional context/screenshots (更多上下文/截图)**
   
   


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