unit_race test flakyness in vitess/go/mysql

[morgo]

2019-12-31T17:01:51.5814048Z ok  	vitess.io/vitess/go/memcache	1.009s
2019-12-31T17:01:58.4099659Z W1231 17:01:54.983007   18121 auth_server_static.go:202] Config parsed using legacy configuration. Please update to the latest format: {"user":[{"Password": "xxx"}, ...]}
2019-12-31T17:01:58.4101424Z E1231 17:01:54.985027   18121 server.go:325] Cannot read post-SSL client handshake response from client 1 ([::1]:37946): tls: client didn't provide a certificate
2019-12-31T17:01:58.4102657Z io.ReadFull(header size) failed
2019-12-31T17:01:58.4103325Z E1231 17:01:57.044655   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4103686Z E1231 17:01:57.047185   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4103979Z E1231 17:01:57.488260   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4104279Z E1231 17:01:57.489453   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4104560Z E1231 17:01:57.490707   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4106028Z W1231 17:01:57.491574   18121 server.go:368] Error authenticating user using MySQL native password: Access denied for user 'user1' (errno 1045) (sqlstate 28000)
2019-12-31T17:01:58.4106372Z E1231 17:01:57.491917   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4106911Z W1231 17:01:57.492699   18121 server.go:368] Error authenticating user using MySQL native password: Access denied for user 'user1' (errno 1045) (sqlstate 28000)
2019-12-31T17:01:58.4107198Z E1231 17:01:57.493028   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4107421Z E1231 17:01:57.493921   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4107625Z E1231 17:01:57.495589   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4107841Z E1231 17:01:57.497278   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4108307Z W1231 17:01:57.503602   18121 server.go:456] Slow connection from client 1 (127.0.0.1:43410): 369.3µs
2019-12-31T17:01:58.4108821Z E1231 17:01:57.510653   18121 server.go:278] mysql_server caught panic:
2019-12-31T17:01:58.4109032Z test panic attack!
2019-12-31T17:01:58.4109278Z /home/runner/work/vitess/vitess/go/mysql/server_test.go:127 (0xb16c4c)
2019-12-31T17:01:58.4109761Z 	io/vitess/go/mysql.(*testHandler).ComQuery: panic("test panic attack!")
2019-12-31T17:01:58.4110060Z /home/runner/work/vitess/vitess/go/mysql/conn.go:1070 (0xa8f11b)
2019-12-31T17:01:58.4110315Z 	io/vitess/go/mysql.(*Conn).execQuery: err := handler.ComQuery(c, query, func(qr *sqltypes.Result) error {
2019-12-31T17:01:58.4110569Z /home/runner/work/vitess/vitess/go/mysql/conn.go:771 (0xa8e6ea)
2019-12-31T17:01:58.4110806Z 	io/vitess/go/mysql.(*Conn).handleNextCommand: if err := c.execQuery(sql, handler, more); err != nil {
2019-12-31T17:01:58.4111079Z /home/runner/work/vitess/vitess/go/mysql/server.go:463 (0xabd38c)
2019-12-31T17:01:58.4111301Z 	io/vitess/go/mysql.(*Listener).handle: err := c.handleNextCommand(l.handler)
2019-12-31T17:01:58.4111602Z /opt/hostedtoolcache/go/1.12.14/x64/src/runtime/asm_amd64.s:1337 (0x488010)
2019-12-31T17:01:58.4112386Z 	goexit: BYTE	$0x90	// NOP
2019-12-31T17:01:58.4112735Z E1231 17:01:57.527611   18121 conn.go:1117] Error in the middle of a stream to client 5 (127.0.0.1:43418): forced error after send (errno 1047) (sqlstate 08S01)
2019-12-31T17:01:58.4113472Z W1231 17:01:57.555525   18121 server.go:368] Error authenticating user using MySQL native password: Access denied for user 'user1' (errno 1045) (sqlstate 28000)
2019-12-31T17:01:58.4114196Z W1231 17:01:57.560827   18121 server.go:368] Error authenticating user using MySQL native password: Access denied for user 'user2' (errno 1045) (sqlstate 28000)
2019-12-31T17:01:58.4114725Z --- FAIL: TestServer (0.06s)
2019-12-31T17:01:58.4116412Z ##[error]    server_test.go:238: listening on address '127.0.0.1' port 46285
2019-12-31T17:01:58.4142022Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e error -h 127.0.0.1 -P 46285 -u user1 -ppassword1]
2019-12-31T17:01:58.4143163Z ##[error]    server_test.go:602: Expected ConnCount=0, got 1
2019-12-31T17:01:58.4144723Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e panic -h 127.0.0.1 -P 46285 -u user1 -ppassword1]
2019-12-31T17:01:58.4146711Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e select rows -h 127.0.0.1 -P 46285 -u user1 -ppassword1]
2019-12-31T17:01:58.4148196Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e select rows -h 127.0.0.1 -P 46285 -u user1 -ppassword1]
2019-12-31T17:01:58.4149620Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e error after send -h 127.0.0.1 -P 46285 -u user1 -ppassword1]
2019-12-31T17:01:58.4150817Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e insert -h 127.0.0.1 -P 46285 -u user1 -ppassword1]
2019-12-31T17:01:58.4153056Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e schema echo -h 127.0.0.1 -P 46285 -u user1 -ppassword1 -D XXXfancyXXX]
2019-12-31T17:01:58.4154544Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e ssl echo -h 127.0.0.1 -P 46285 -u user1 -ppassword1 -D XXXfancyXXX]
2019-12-31T17:01:58.4156284Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e userData echo -h 127.0.0.1 -P 46285 -u user1 -ppassword1 -D XXXfancyXXX]
2019-12-31T17:01:58.4157526Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e select rows -h 127.0.0.1 -P 46285 -u user1 -pbad -D XXXfancyXXX]
2019-12-31T17:01:58.4158646Z ##[error]    server_test.go:1249: Running mysql command: /usr/bin/mysql [-v -v -v -e select rows -h 127.0.0.1 -P 46285 -u user2 -ppassword1 -D XXXfancyXXX]
2019-12-31T17:01:58.4159217Z E1231 17:01:57.561630   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4159723Z E1231 17:01:57.586110   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4160019Z E1231 17:01:57.592197   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4160394Z E1231 17:01:58.005498   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4160912Z E1231 17:01:58.398741   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4161204Z E1231 17:01:58.400935   18121 auth_server_static.go:142] Error parsing auth server config: EOF
2019-12-31T17:01:58.4161462Z FAIL
2019-12-31T17:01:58.4161723Z FAIL	vitess.io/vitess/go/mysql	3.821s
2019-12-31T17:01:58.4162596Z ok  	vitess.io/vitess/go/mysql/ldapauthserver	1.018s

[deepthi]

Fixed in #6808