[I] Brpc channel core 掉的bug (brpc)

[via GitHub]

frankleaf opened a new issue, #2461:
URL: https://github.com/apache/brpc/issues/2461

   **Describe the bug (描述bug)**
   
   Brpc 在发起 IssueRPC 的过程中，由于从hosts里解析rpc_address对应的ip 地址失败，导致core掉
   
   **To Reproduce (复现方法)**
   
   在rpc发送过程中，从hosts当中删掉原本通过域名解析发送rpc请求的内容
   
   **Expected behavior (期望行为)**
   
   
   **Versions (各种版本)**
   OS:
   Compiler:
   brpc:
   protobuf:
   
   **Additional context/screenshots (更多上下文/截图)**
   
   ```
   #0  0x0000000000000000 in ?? ()
   #1  0x0000000000faa088 in brpc::Channel::CallMethod (this=0x7f3259207500,
       method=0x7f3259254fc0, controller_base=0x7f325927bb18, 
request=0x7f31dde6f4b0,
       response=0x7f31dde6f470, done=0x7f325927baf8)
       at /root/src/brpc/channel.cpp:521
   #2  0x0000000000fa51aa in brpc::aschan::Sender::IssueRPC 
(this=0x7f325927ba80,
       start_realtime_us=<optimized out>)
   ```
   
   ```
   I1130 08:09:49.649348 271 socket.cpp:2364] Checking Socket{id=0 
addr=192.168.14.57:18186} (0x7f325f7a5600)
   E1130 08:09:50.059639 279 channel.cpp:261] Invalid 
address=`test-jindofs-master-0.default:18186'
   E1130 08:09:50.060728 279 channel.cpp:261] Invalid 
address=`test-jindofs-master-0.default:18186'
   E1130 08:09:50.061666 279 channel.cpp:261] Invalid 
address=`test-jindofs-master-0.default:18186'
   E1130 08:09:50.062514 279 channel.cpp:261] Invalid 
address=`test-jindofs-master-0.default:18186'
   E1130 08:09:50.063379 279 channel.cpp:261] Invalid 
address=`test-jindofs-master-0.default:18186'
   E1130 08:09:50.064148 279 channel.cpp:261] Invalid 
address=`test-jindofs-master-0.default:18186'
   I1130 08:09:50.064195 279 active_standby_channel.cpp:324] Selected 
Channel[0.0.0.0:0], socket 114
   Error: signal 11 Segmentation fault, PID 1, TID 7f31dde79700
   Stacktrace with Glog:
       @              (nil)  (unknown)
   
   
   Stacktrace with Boost:
   ```
   


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