What version of Go are you using (go version)?

$ go version
go 1.15

Does this issue reproduce with the latest release?

What operating system and processor architecture are you using (go env)?

$ go env
ubuntu 18.04
Linux mi 5.4.0-48-generic #52~18.04.1-Ubuntu SMP Thu Sep 10 12:50:22 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

What did you do?

I have a http server code and a test code for it. I can pass the test normally using go test -coverprofile=coverage.out -v in go1.13, but use go test -coverprofile=coverage.out in go1.15 -v will display could not shutdown the server: context canceled. There is no problem when using go test -v -cover, that is, only using go test -coverprofile=coverage.out -v in go1.15 will cause an error and fail the test
this is my server_test.go

	var wg sync.WaitGroup
	wg.Add(1)
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	go func() {
		Serv(ctx)
		defer wg.Done()
	}()

What did you expect to see?

=== RUN   TestServ
--- PASS: TestServ (2.79s)
PASS
INFO[0031] server is shutting down                       
INFO[0031] http server exited                            
coverage: xx of statements
ok  	xxxx/xxxx/xxxx/http	31.989s

What did you see instead?

=== RUN   TestServ
--- PASS: TestServ (2.79s)
PASS
INFO[0030] server is shutting down                       
INFO[0030] could not shutdown the server: context canceled
exit status 1
FAIL		xxxx/xxxx/xxxx/http	30.117s