diff --git a/source/client/src/clientHb.c b/source/client/src/clientHb.c
index 4240a8510dffd922921633d078cefaa9ff267881..203aad8068eb7dc1bfc191300d73d07245e57cdd 100644
--- a/source/client/src/clientHb.c
+++ b/source/client/src/clientHb.c
@@ -1172,7 +1172,7 @@ void hbDeregisterConn(STscObj *pTscObj, SClientHbKey connKey) {
 
   taosThreadMutexLock(&pTscObj->mutex);
   if (pTscObj->passInfo.fp) {
-    int32_t cnt = atomic_sub_fetch_32(&pAppHbMgr->passKeyCnt, 1);
+    atomic_sub_fetch_32(&pAppHbMgr->passKeyCnt, 1);
   }
   taosThreadMutexUnlock(&pTscObj->mutex);
 }
\ No newline at end of file
diff --git a/tests/system-test/1-insert/influxdb_line_taosc_insert.py b/tests/system-test/1-insert/influxdb_line_taosc_insert.py
index 819951cce5434d349a19d8dcbb9567c145ec93ba..3e9bad4efd1b2a65b61636fcc305a5f61ec926db 100644
--- a/tests/system-test/1-insert/influxdb_line_taosc_insert.py
+++ b/tests/system-test/1-insert/influxdb_line_taosc_insert.py
@@ -896,7 +896,7 @@ class TDTestCase:
         tdSql.checkRows(2)
         tdSql.checkNotEqual(tb_name1, tb_name3)
 
-    # * tag binary max is 16384, col+ts binary max  65531
+    # * tag binary max is 16384-2, col+ts binary max 65531
     def tagColBinaryMaxLengthCheckCase(self):
         """
             every binary and nchar must be length+2
@@ -960,7 +960,7 @@ class TDTestCase:
             tdSql.checkNotEqual(err.errno, 0)
 
 
-    # * tag nchar max is 16384/4, col+ts nchar max  65531
+    # * tag nchar max is (16384-2)/4, col+ts nchar max 65531
     def tagColNcharMaxLengthCheckCase(self):
         """
             check nchar length limit
@@ -971,7 +971,7 @@ class TDTestCase:
         input_sql = f'{stb_name},id="{tb_name}",t0=t c0=f 1626006833639000000'
         code = self._conn.schemaless_insert([input_sql], TDSmlProtocolType.LINE.value, TDSmlTimestampType.NANO_SECOND.value)
 
-        # * legal tag nchar could not be larger than 16384/4
+        # * legal tag nchar could not be larger than (16384-2)/4
         # input_sql = f'{stb_name},t0=t,t1=L"{tdCom.getLongName(4093, "letters")}",t2=L"{tdCom.getLongName(1, "letters")}" c0=f 1626006833639000000'
         # self._conn.schemaless_insert([input_sql], TDSmlProtocolType.LINE.value, TDSmlTimestampType.NANO_SECOND.value)
         # tdSql.query(f"select * from {stb_name}")