Re: [I] brpc client 开启dummy server 程序core掉 (brpc)

[via GitHub]

wudianer commented on issue #2896:
URL: https://github.com/apache/brpc/issues/2896#issuecomment-2667611118

   > 可以给一个能复现的demo吗
   
   感谢回复 具体场景是客户端http请求下载文件 我们服务接收请求后 调用存储端的sdk读文件并做处理 
   ```
       ctx->AsyncCallWithAttachment([req, callback = std::move(callback), ctx = 
std::move(ctx)]() mutable
                                    {  
            ### // brpc回调：
             auto lambda = [ctx](char *data, size_t length) -> size_t
               {
                    if (ctx == nullptr || length == 0) {
                   // 缓冲区错误
                   return 0; 
               }
               if(!ctx->readed){
                   ctx->readed = true;
                   if (ctx->ret_val!=0){
                       LOG_ERROR << "AsyncCall failed";
                       return 0; 
                   }
               }
                   size_t bytesToWrite = std::min(length, ctx->object_size);
                   if (ctx->offset + bytesToWrite > ctx->object_size)
                   {
                       bytesToWrite = ctx->object_size - ctx->offset;
                   }
           ### //看gdb是当访问contention这里出core 
                   ctx->buf.cutn(data, bytesToWrite);  
                   ctx->offset += bytesToWrite;
                   return bytesToWrite;
               };
               auto resp = HttpResponse::newStreamResponse(lambda, "", 
CT_APPLICATION_OCTET_STREAM, "", req);
               resp->addHeader("Content-Length", 
std::to_string(ctx->object_size));
               callback(resp); }); 
   ```
   然后配置一个dummy_server.port  访问flags ，status ，vars这些没问题 但是访问contention这些就出问题，当然 
进程不承接流量 不会有问题
   
   
![Image](https://github.com/user-attachments/assets/0df75e90-a58d-4db4-8c30-6833da53c0cd)


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