fix: fix rpc context freed in timer callback issue

src/rpc/src/rpcMain.c

@@ -1080,7 +1080,10 @@ static void rpcProcessBrokenLink(SRpcConn *pConn) {
     pContext->code = TSDB_CODE_RPC_NETWORK_UNAVAIL;
     pContext->pConn = NULL;
     pConn->pReqMsg = NULL;
-    taosTmrStart(rpcProcessConnError, 0, pContext, pRpc->tmrCtrl);
+    taosAcquireRef(tsRpcRefId, pContext->rid);
+    int64_t *rid = malloc(sizeof(int64_t));
+    *rid = pContext->rid;
+    taosTmrStart(rpcProcessConnError, 0, rid, pRpc->tmrCtrl);
   }
    
   if (pConn->inType) rpcReportBrokenLinkToServer(pConn); 
@@ -1293,7 +1296,9 @@ static void rpcProcessIncomingMsg(SRpcConn *pConn, SRpcHead *pHead, SRpcReqConte
       rpcFreeCont(rpcMsg.pCont);
     } else if (pHead->code == TSDB_CODE_RPC_NOT_READY || pHead->code == TSDB_CODE_APP_NOT_READY || pHead->code == TSDB_CODE_DND_EXITING) {
       pContext->code = pHead->code;
-      rpcProcessConnError(pContext, NULL);
+      int64_t *rid = malloc(sizeof(int64_t));
+      *rid = pContext->rid;      
+      rpcProcessConnError(rid, NULL);
       rpcFreeCont(rpcMsg.pCont);
     } else {
       rpcNotifyClient(pContext, &rpcMsg);
@@ -1395,7 +1400,9 @@ static TBOOL rpcSendReqToServer(SRpcInfo *pRpc, SRpcReqContext *pContext) {
   if (pConn == NULL) {
     pContext->code = terrno;
     // in rpcProcessConnError if numOfTry over limit, could call rpcNotifyClient to stop query
-    taosTmrStart(rpcProcessConnError, 1, pContext, pRpc->tmrCtrl);
+    int64_t *rid = malloc(sizeof(int64_t));
+    *rid = pContext->rid;
+    taosTmrStart(rpcProcessConnError, 1, rid, pRpc->tmrCtrl);
     return BOOL_ASYNC;
   }
 
@@ -1442,7 +1449,9 @@ static TBOOL rpcSendReqToServer(SRpcInfo *pRpc, SRpcReqContext *pContext) {
     // try next ip again
     pContext->code = terrno;
     // in rpcProcessConnError if numOfTry over limit, could call rpcNotifyClient to stop query
-    taosTmrStart(rpcProcessConnError, 1, pContext, pRpc->tmrCtrl);
+    int64_t *rid = malloc(sizeof(int64_t));
+    *rid = pContext->rid;
+    taosTmrStart(rpcProcessConnError, 1, rid, pRpc->tmrCtrl);
     return BOOL_ASYNC;
   }
 
@@ -1480,11 +1489,17 @@ static bool rpcSendMsgToPeer(SRpcConn *pConn, void *msg, int msgLen) {
 }
 
 static void rpcProcessConnError(void *param, void *id) {
-  SRpcReqContext *pContext = (SRpcReqContext *)param;
+  int64_t *rid = (int64_t*)param;
+  SRpcReqContext *pContext = (SRpcReqContext *)taosAcquireRef(tsRpcRefId, *rid);
+  if (NULL == pContext) {
+    return;
+  }
+  
   SRpcInfo       *pRpc = pContext->pRpc;
   SRpcMsg         rpcMsg;
  
   if (pRpc == NULL) {
+    taosReleaseRef(tsRpcRefId, *rid);
     return;
   }
   
@@ -1504,6 +1519,8 @@ static void rpcProcessConnError(void *param, void *id) {
     pContext->epSet.inUse = pContext->epSet.inUse % pContext->epSet.numOfEps;
     rpcSendReqToServer(pRpc, pContext);
   }
+
+  taosReleaseRef(tsRpcRefId, *rid);  
 }
 
 static void rpcProcessRetryTimer(void *param, void *tmrId) {
@@ -1528,7 +1545,9 @@ static void rpcProcessRetryTimer(void *param, void *tmrId) {
         pConn->pContext->code = TSDB_CODE_RPC_NETWORK_UNAVAIL;
         pConn->pContext->pConn = NULL;
         pConn->pReqMsg = NULL;
-        taosTmrStart(rpcProcessConnError, 1, pConn->pContext, pRpc->tmrCtrl);
+        int64_t *rid = malloc(sizeof(int64_t));
+        *rid = pConn->pContext->rid;
+        taosTmrStart(rpcProcessConnError, 1, rid, pRpc->tmrCtrl);
         rpcReleaseConn(pConn);
       }
     }
@@ -1892,4 +1911,4 @@ bool rpcSaveSendInfo(int64_t rpcRid, void** ppContext) {
 
   taosReleaseRef(tsRpcRefId, rpcRid);
   return true;
-}
+}
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