os: TestFileWriteFdRace failures

[gopherbot]

#!watchflakes
default <- pkg == "os" && test == "TestFileWriteFdRace"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestFileWriteFdRace
=== PAUSE TestFileWriteFdRace
=== CONT  TestFileWriteFdRace

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "os" && test == "TestFileWriteFdRace"

2025-06-10 03:33 gotip-windows-amd64 go@ee7bfbdb os.TestFileWriteFdRace [SKIP] (log)

=== RUN   TestFileWriteFdRace
=== PAUSE TestFileWriteFdRace
=== CONT  TestFileWriteFdRace

— watchflakes