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

$ go version
1.17.6
OS:
Windows 10 Professional 2004 19041.1081

Does this issue reproduce with the latest release?

Yes

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

$ go env
set GO111MODULE=on
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\xxx\AppData\Local\go-build
set GOENV=C:\Users\xxx\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOMODCACHE=D:\go\pkg\mod
set GONOSUMDB=*
set GOOS=windows
set GOPATH=D:\go
set GOPRIVATE=
set GOROOT=C:\Program Files\Go
set GOSUMDB=off
set GOTMPDIR=
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.17.6
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=D:\go\src\test\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\xxx\AppData\Local\Temp\go-build1098534111=/tmp/go-build -gno-record-gcc-switches

What did you do?

I ran the test func below,which using t.TempDir() to create a tmp dir, from the func's comment, it will do Cleanup to remove the tmp dir after testing ends, but I got an err:
testing.go:967: TempDir RemoveAll cleanup: remove C:\Users\xxx\AppData\Local\Temp\TestTmpDirRemove3730116776\001\foo2619329076.txt: The process cannot access the file because it is being used by another process.,
and I found the tmp dir and file was not removed correctly, after some digging I found that this seems happen only on Windows, Linux works correctly. I tried uncomment f.Close(), it worked and the file was removed as expected. There is also some issues mentioned this problem like #44919,but it seems that this problem is not solved.
And my question is: Should we callf.Close()when using t.TempDir() on Windows to make it work as expected, but this may causeTempDir()becoming meaningless, or we should fix it on Windows?

func TestTmpDirRemove(t *testing.T) {
	tmpDir := t.TempDir()

	f, err := ioutil.TempFile(tmpDir, "foo")
	if err != nil {
		t.Fatal(err)
	}

	ioutil.WriteFile(f.Name(), []byte("bar"), os.FileMode(0755))
	t.Run("", func(t *testing.T) {
		fmt.Println("This is a test")
	})
	// f.Close()
}

What did you expect to see?

The tmp was removed and no errors

What did you see instead?

The tmp dir and file was not removed