flaky test TestConnectThrough636 #56309
Description
Bug Report
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=== RUN TestConnectThrough636
ldap_common_test.go:68:
Error Trace: pkg/privilege/privileges/ldap/ldap_common_test.go:68
src/runtime/asm_amd64.s:1650
Error: Received unexpected error:
listen tcp 127.0.0.1:12186: bind: address already in use
Test: TestConnectThrough636
ldap_common_test.go:109:
Error Trace: pkg/privilege/privileges/ldap/ldap_common_test.go:109
Error: Received unexpected error:
LDAP Result Code 200 "Network Error": dial tcp [::1]:12186: connect: connection refused
create ldap connection
github.com/pingcap/tidb/pkg/privilege/privileges/ldap.(*ldapAuthImpl).connectionFactory
pkg/privilege/privileges/ldap/ldap_common.go:184
github.com/pingcap/tidb/pkg/privilege/privileges/ldap.TestConnectThrough636
pkg/privilege/privileges/ldap/ldap_common_test.go:108
testing.tRunner
GOROOT/src/testing/testing.go:1595
runtime.goexit
src/runtime/asm_amd64.s:1650
Test: TestConnectThrough636
--- FAIL: TestConnectThrough636 (1.94s)