net: TestFilePacketConn failures

[gopherbot]

#!watchflakes
default <- pkg == "net" && test == "TestFilePacketConn"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestFilePacketConn
    file_test.go:273: file file+net udp4:127.0.0.1:62481->: invalid argument
--- FAIL: TestFilePacketConn (0.00s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "net" && test == "TestFilePacketConn"

2025-05-13 17:01 gotip-windows-amd64-longtest go@4aeb9ba0 net.TestFilePacketConn (log)

=== RUN   TestFilePacketConn
    file_test.go:273: file file+net udp4:127.0.0.1:62481->: invalid argument
--- FAIL: TestFilePacketConn (0.00s)

— watchflakes

[mknyszek]

Looking at the test history the first recorded instance appears to be https://ci.chromium.org/ui/p/golang/builders/ci/gotip-windows-amd64-longtest/b8714968133031208929/test-results?sortby=&groupby= and it also appears to be Windows specific. The nearest commit before the first failure that looks related is 41bd52b which deals with files and sockets on Windows. Just a guess though, I could be wrong. CC @qmuntal @neild

[qmuntal]

Thanks for the hints @mknyszek. The failure mode looks similar to #73683, which have just been closed by https://go.dev/cl/672195. I'll mark this issue as closed, given that that it will probable be fixed by CL 672195.