diff --git a/source/dnode/vnode/src/tsdb/tsdbRead2.c b/source/dnode/vnode/src/tsdb/tsdbRead2.c
index e2123df3a8..f581623e86 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead2.c
@@ -4899,6 +4899,7 @@ int32_t tsdbTakeReadSnap2(STsdbReader* pReader, _query_reseek_func_t reseek, STs
   // alloc
   STsdbReadSnap* pSnap = (STsdbReadSnap*)taosMemoryCalloc(1, sizeof(STsdbReadSnap));
   if (pSnap == NULL) {
+    taosThreadRwlockUnlock(&pTsdb->rwLock);
     code = TSDB_CODE_OUT_OF_MEMORY;
     goto _exit;
   }
@@ -4908,6 +4909,7 @@ int32_t tsdbTakeReadSnap2(STsdbReader* pReader, _query_reseek_func_t reseek, STs
     pSnap->pMem = pTsdb->mem;
     pSnap->pNode = taosMemoryMalloc(sizeof(*pSnap->pNode));
     if (pSnap->pNode == NULL) {
+      taosThreadRwlockUnlock(&pTsdb->rwLock);
       code = TSDB_CODE_OUT_OF_MEMORY;
       goto _exit;
     }
@@ -4922,6 +4924,7 @@ int32_t tsdbTakeReadSnap2(STsdbReader* pReader, _query_reseek_func_t reseek, STs
     pSnap->pIMem = pTsdb->imem;
     pSnap->pINode = taosMemoryMalloc(sizeof(*pSnap->pINode));
     if (pSnap->pINode == NULL) {
+      taosThreadRwlockUnlock(&pTsdb->rwLock);
       code = TSDB_CODE_OUT_OF_MEMORY;
       goto _exit;
     }
@@ -4932,6 +4935,9 @@ int32_t tsdbTakeReadSnap2(STsdbReader* pReader, _query_reseek_func_t reseek, STs
     tsdbRefMemTable(pTsdb->imem, pSnap->pINode);
   }
 
+  // unlock
+  taosThreadRwlockUnlock(&pTsdb->rwLock);
+
   // fs
   code = tsdbFSCreateRefSnapshot(pTsdb->pFS, &pSnap->pfSetArray);
   if (code == TSDB_CODE_SUCCESS) {
@@ -4939,8 +4945,6 @@ int32_t tsdbTakeReadSnap2(STsdbReader* pReader, _query_reseek_func_t reseek, STs
   }
 
 _exit:
-  taosThreadRwlockUnlock(&pTsdb->rwLock);
-
   if (code != TSDB_CODE_SUCCESS) {
     tsdbError("vgId:%d take read snapshot failed, code:%s", TD_VID(pTsdb->pVnode), tstrerror(code));