Binlog connection stays up after shutdowning

[JackShadow]

After turning off connection is alive in mariadb (10.2).
Closing connection on SIGTERM via canal.Close() doesn't work

2018/05/29 18:15:43 INFO  syncer is closing...
2018/05/29 18:15:43 ERROR canal start sync binlog err: context canceled
2018/05/29 18:15:43 ERROR  connection was bad
2018/05/29 18:15:43 ERROR close sync with err: Sync was closed
2018/05/29 18:15:43 INFO  syncer is closed

and than connection is still on.

[siddontang]

than connection is still on

What does it mean?

[JackShadow]

It remains unclosed in mysql connection pull.