[I] task tracer 信号追踪问题讨论 (brpc)

Thu, 03 Jul 2025 23:52:34 -0700 


CodeZHXS opened a new issue, #3015:
URL: https://github.com/apache/brpc/issues/3015

   task tracer 目前有 `ContextTrace` 和 `SignalTrace` 两种回溯方式，`SignalTrace` 
将信号发送给目标进程，目标进程处理信号的同时，将运行上下文 `context` 发送给 `SignalTrace` 的进程。
   
   `SignalHandler` 函数启用了一个超时的时间（默认是 50ms），如果回溯超时，`SignalHandler` 会直接退出并结束。
   
   
![Image](https://github.com/user-attachments/assets/c85125e6-d26f-4f3a-959f-0a41f9b3a2df)
   
   这种方式会不会存在问题？例如，如果 `SignalTrace` 在 `unw_init_local` 之前，`SignalHandler` 
就退出了，这样的话 `unw_init_local` 可能会失败，甚至访问到空指针。
   
   <img width="513" alt="Image" 
src="https://github.com/user-attachments/assets/3ae6b9b1-f1a2-41e3-a080-2e43b64a8577";
 />


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