[I] 服务卡死（死锁？），并且关闭请求后，也无法恢复 (brpc)

[via GitHub]

yufeixu-sohu opened a new issue, #2912:
URL: https://github.com/apache/brpc/issues/2912

   **Describe the bug (描述bug)**
   在usercode_in_pthread模式下，并发http请求过多时，服务会卡死（死锁？），并且关闭请求后，也无法恢复
   
   
![Image](https://github.com/user-attachments/assets/9a0a85c6-86f9-4deb-a08e-a9845cc7a410)
   
   **To Reproduce (复现方法)**
   brpc::ServerOptions options;
   options.num_threads = 2；
   每次并发10个http请求，导致服务直接卡死，CPU使用率几乎降低到0，应该就是死锁了。
   即使现在请求关闭，服务再也无法恢复。
   
   **Expected behavior (期望行为)**
   关闭请求后，服务应该恢复，新的请求能够进来并处理。
   
   **Versions (各种版本)**
   OS:  Linux version 4.4.70-1.el7.elrepo.x86_64 (mockbuild@Build64R7) (gcc 
version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) ) #1 SMP Fri May 26 07:43:23 
EDT 2017
   Compiler: gcc4.8.5
   brpc: apache-brpc-1.5.0
   protobuf:3.0
   
   **Additional context/screenshots (更多上下文/截图)**
   
   


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