为提高效率，提问时请提供以下信息，问题描述清晰可优先响应。
- 【TiDB 版本】：DM1.0
- 【问题描述】：[2020/10/29 10:26:11.459 +08:00] [ERROR] [subtask.go:252] [“unit process error”] [subtask=worker14] [unit=Sync] [“error information”="{“msg”:"[code=10001:class=database:scope=downstream:level=high] database driver error: bad connection\ngithub.com/pingcap/dm/pkg/terror.(*Error).Delegate\ \t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/pkg/terror/terror.go:267\ngithub.com/pingcap/dm/pkg/terror.DBErrorAdaptArgs\ \t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/pkg/terror/adapter.go:39\ github.com/pingcap/dm/pkg/terror.DBErrorAdapt\ \t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/pkg/terror/adapter.go:46\ github.com/pingcap/dm/pkg/conn.(*BaseDB).GetBaseConn\ \t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/pkg/conn/basedb.go:92\ngithub.com/pingcap/dm/syncer.createConns.func1\ \t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/syncer/db.go:299\ github.com/pingcap/dm/syncer.(*DBConn).resetConn\ \t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/syncer/db.go:157\ngithub.com/pingcap/dm/syncer.(*Syncer).resetDBs\ \t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/syncer/syncer.go:513\ngithub.com/pingcap/dm/syncer.(*Syncer).Resume\ \t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/syncer/syncer.go:2277\ runtime.goexit\ \t/usr/local/go/src/runtime/asm_amd64.s:1337",“error”:{“ErrCode”:10001,“ErrClass”:1,“ErrScope”:2,“ErrLevel”:3,“Message”:“database driver error: bad connection”,“RawCause”:“bad connection”}}"]
若提问为性能优化、故障排查类问题，请下载脚本运行。终端输出的打印结果，请务必全选并复制粘贴上传。