address already in use with some server's test. #45216
Description
Bug Report
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tidb_test.go:3198:
Error Trace: server/tidb_test.go:3198
Error: Received unexpected error:
listen tcp 127.0.0.1:4000: bind: address already in use
github.com/pingcap/errors.AddStack
external/com_github_pingcap_errors/errors.go:174
github.com/pingcap/errors.Trace
external/com_github_pingcap_errors/juju_adaptor.go:15
github.com/pingcap/tidb/server.NewServer
server/server.go:275
github.com/pingcap/tidb/server.TestProxyProtocolWithIpNoFallbackable
server/tidb_test.go:3197
testing.tRunner
GOROOT/src/testing/testing.go:1576
runtime.goexit
src/runtime/asm_amd64.s:1598
Test: TestProxyProtocolWithIpNoFallbackable