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】：V3.0.12
- 【问题描述】：tidb 日志一直报下面错误： 2020/06/04 15:57:58.673 terror.go:357: [error] EOF github.com/pingcap/errors.AddStack /home/jenkins/agent/workspace/tidb_v3.0.12/go/pkg/mod/github.com/pingcap/errors@v0.11.4/errors.go:174 github.com/pingcap/errors.Trace /home/jenkins/agent/workspace/tidb_v3.0.12/go/pkg/mod/github.com/pingcap/errors@v0.11.4/juju_adaptor.go:15 github.com/pingcap/tidb/server.(*packetIO).readOnePacket /home/jenkins/agent/workspace/tidb_v3.0.12/go/src/github.com/pingcap/tidb/server/packetio.go:80 github.com/pingcap/tidb/server.(*packetIO).readPacket /home/jenkins/agent/workspace/tidb_v3.0.12/go/src/github.com/pingcap/tidb/server/packetio.go:105 github.com/pingcap/tidb/server.(*clientConn).readPacket /home/jenkins/agent/workspace/tidb_v3.0.12/go/src/github.com/pingcap/tidb/server/conn.go:265 github.com/pingcap/tidb/server.(*clientConn).readOptionalSSLRequestAndHandshakeResponse /home/jenkins/agent/workspace/tidb_v3.0.12/go/src/github.com/pingcap/tidb/server/conn.go:471 github.com/pingcap/tidb/server.(*clientConn).handshake /home/jenkins/agent/workspace/tidb_v3.0.12/go/src/github.com/pingcap/tidb/server/conn.go:172 github.com/pingcap/tidb/server.(*Server).onConn /home/jenkins/agent/workspace/tidb_v3.0.12/go/src/github.com/pingcap/tidb/server/server.go:345 runtime.goexit /usr/local/go/src/runtime/asm_amd64.s:1357
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