From 4e0f1055dce5aaf60d70b122307f5026ba37e2c7 Mon Sep 17 00:00:00 2001
From: Jeff Tao <jhtao@taosdata.com>
Date: Tue, 1 Dec 2020 03:44:37 +0000
Subject: [PATCH] remove a potential rpcSendRecv deadlock

---
 src/rpc/src/rpcMain.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/rpc/src/rpcMain.c b/src/rpc/src/rpcMain.c
index acceaf9d7a..4ccdec2bc7 100644
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@@ -630,7 +630,14 @@ static void rpcReleaseConn(SRpcConn *pConn) {
   } else {
     // if there is an outgoing message, free it
     if (pConn->outType && pConn->pReqMsg) {
-      if (pConn->pContext) pConn->pContext->pConn = NULL; 
+      if (pContext->pRsp) {   
+        // for synchronous API, post semaphore to unblock app
+        pContext->pRsp->code = TSDB_CODE_RPC_APP_ERROR;
+        pContext->pRsp->pCont = NULL;
+        pContext->pRsp->contLen = 0;
+        tsem_post(pContext->pSem);
+      }
+      pConn->pContext->pConn = NULL; 
       taosRemoveRef(tsRpcRefId, pConn->pContext->rid);
     }
   }
-- 
GitLab