cmd/go: TestScript/mod_dir failures

[gopherbot]

#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/mod_dir"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/mod_dir
=== PAUSE TestScript/mod_dir
=== CONT  TestScript/mod_dir
    script_test.go:135: 2024-07-29T21:43:11Z
    script_test.go:137: $WORK=C:\b\s\w\ir\x\t\cmd-go-test-810710165\tmpdir3080745464\mod_dir556404051
2024/07/29 14:43:11 serving /git/insecurerepo/info/refs?service=git-upload-pack
    script_test.go:159: 
        PATH=C:\b\s\w\ir\x\t\cmd-go-test-810710165\tmpdir3080745464\testbin;C:\b\s\w\ir\x\w\goroot\bin;C:\b\s\w\ir\x\w\goroot\bin;C:\b\s\w\ir\x\w\goroot\bin;C:\b\s\w\ir\cache\tools\bin;C:\b\s\w\ir\bbagent_utility_packages;C:\b\s\w\ir\bbagent_utility_packages\bin;C:\b\s\w\ir\cipd_bin_packages;C:\b\s\w\ir\cipd_bin_packages\bin;C:\b\s\w\ir\cipd_bin_packages\cpython3;C:\b\s\w\ir\cipd_bin_packages\cpython3\bin;C:\b\s\w\ir\cache\cipd_client;C:\b\s\w\ir\cache\cipd_client\bin;C:\b\s\cipd_cache\bin;C:\Program Files\OpenSSH\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Puppet Labs\Puppet\bin;C:\b\s\w\ir\cache\tools\cc\windows\gcc64\bin
        USERPROFILE=/no-home
        CCACHE_DISABLE=1
...
        > stdout 'x/sub'
        matched: x/sub
        > mkdir go.mod
        > exists go.mod
        > go list .
        [stderr]
        go: read C:\b\s\w\ir\x\t\cmd-go-test-810710165\tmpdir3080745464\mod_dir556404051\go.mod: The process cannot access the file because another process has locked a portion of the file.
    script_test.go:159: FAIL: testdata\script\mod_dir.txt:13: go list .: exit status 1
2024/07/29 14:43:11 serving /git/insecurerepo/git-upload-pack
--- FAIL: TestScript/mod_dir (0.21s)

— watchflakes