Merge pull request #15992 from taosdata/fix/rpcDeadlock

fix client deadlock

source/libs/transport/src/transCli.c

@@ -222,7 +222,7 @@ static void cliReleaseUnfinishedMsg(SCliConn* conn) {
         SCliMsg* cliMsg = transQueueGet(&conn->cliMsgs, 0);                                                          \
         if (cliMsg->type == Release) return;                                                                         \
       }                                                                                                              \
-      tDebug("%s conn %p receive release request, ref:%d", CONN_GET_INST_LABEL(conn), conn, T_REF_VAL_GET(conn)); \
+      tDebug("%s conn %p receive release request, refId:%" PRId64 "", CONN_GET_INST_LABEL(conn), conn, conn->refId); \
       if (T_REF_VAL_GET(conn) > 1) {                                                                                 \
         transUnrefCliHandle(conn);                                                                                   \
       }                                                                                                              \
@@ -890,8 +890,8 @@ SCliConn* cliGetConn(SCliMsg* pMsg, SCliThrd* pThrd, bool* ignore) {
   if (refId != 0) {
     SExHandle* exh = transAcquireExHandle(transGetRefMgt(), refId);
     if (exh == NULL) {
+      tError("failed to get conn, refId: %" PRId64 "", refId);
       *ignore = true;
-      destroyCmsg(pMsg);
       return NULL;
     } else {
       conn = exh->handle;
@@ -937,7 +937,16 @@ void cliHandleReq(SCliMsg* pMsg, SCliThrd* pThrd) {
   bool      ignore = false;
   SCliConn* conn = cliGetConn(pMsg, pThrd, &ignore);
   if (ignore == true) {
-    tError("ignore msg");
+    // persist conn already release by server
+    STransMsg resp = {0};
+    resp.code = TSDB_CODE_RPC_BROKEN_LINK;
+    resp.msgType = pMsg->msg.msgType + 1;
+
+    resp.info.ahandle = pMsg && pMsg->ctx ? pMsg->ctx->ahandle : NULL;
+    resp.info.traceId = pMsg->msg.info.traceId;
+
+    pTransInst->cfp(pTransInst->parent, &resp, NULL);
+    destroyCmsg(pMsg);
     return;
   }