multithread share Producer failed accidentally , error “ProducerSendSyncFailed: No route info of this topic”

original issue: https://ask.csdn.net/questions/4332269

error log info
------------------------------------------------------------------------------------
(error): [7f0c4dffb700] no corresponding consumer found for group:TEST_TOPIC_PULL[consumerRunningInfo:1203]
(error): [7f0ac37fe700] GetTransport of:172.20.0.232:30911 get timed_mutex timeout[CreateTransport:307]
(error): [7f0ac37fe700] send failed of times:1,brokerName:broker0[sendDefaultImpl:424]
(error): [7f0ac37fe700] could not find property mq[selectOneMessageQueue:156]
(error): [7f0ac37fe700] GetTransport of:172.20.0.232:30911 get timed_mutex timeout[CreateTransport:307]
(error): [7f0ac37fe700] send failed of times:3,brokerName:broker0[sendDefaultImpl:424]
(error): [7f0ac37fe700] could not find property mq[selectOneMessageQueue:156]
(error): [7f0ac37fe700] GetTransport of:172.20.0.232:30911 get timed_mutex timeout[CreateTransport:307]
(error): [7f0ac37fe700] send failed of times:5,brokerName:broker0[sendDefaultImpl:424]
(error): [7f0ac37fe700] msg: No route info of this topic: ScannerPocTask,error:-1,in file line:434[send:137]

PS：in fact，the message has been sent successfully...

從連結的重現步驟以及 src/producer/DefaultMQProducerImpl.cpp 中的錯誤位置開始：send 約在第 434 行，selectOneMessageQueue 約在第 156 行，CreateTransport 約在第 307 行。追蹤多執行緒 producer 的路徑，並將回報的傳送失敗與「訊息已成功傳送」的說明進行比較。當共用 producer 情境不再回報虛假失敗，也不再缺少路由資訊時，即視為完成。

由索引模型根據 Issue 內容生成。