cmd/go/internal/modfetch: TestCodeRepoVersions failures

[gopherbot]

#!watchflakes
post <- pkg == "cmd/go/internal/modfetch" && `test timed out` && `^cmd/go/internal/web\.Get`

Issue created automatically to collect these failures.

Example (log):

vcs-test.golang.org rerouted to http://127.0.0.1:40375
https://vcs-test.golang.org rerouted to https://127.0.0.1:38347
panic: test timed out after 15m0s
running tests:
	TestCodeRepoVersions (14m27s)
	TestCodeRepoVersions/parallel (14m27s)
	TestCodeRepoVersions/parallel/swtch.com_testmod (14m27s)

runtime.gopark(0xc000079e00?, 0x40dec5?, 0x50?, 0x36?, 0x18?)
	/workdir/go/src/runtime/proc.go:387 +0xce fp=0xc000079d98 sp=0xc000079d78 pc=0x43ae4e
runtime.chanrecv(0xc00030a3f0, 0xc000079e7f, 0x1)
	/workdir/go/src/runtime/chan.go:583 +0x3cd fp=0xc000079e10 sp=0xc000079d98 pc=0x40752d
runtime.chanrecv1(0xb43700?, 0x7b0de0?)
	/workdir/go/src/runtime/chan.go:442 +0x12 fp=0xc000079e38 sp=0xc000079e10 pc=0x407152
testing.(*T).Run(0xc0002bd1e0, {0x839a87?, 0x83ea2f?}, 0x876e48)
	/workdir/go/src/testing/testing.go:1649 +0x3c8 fp=0xc000079ef8 sp=0xc000079e38 pc=0x501548
cmd/go/internal/modfetch.TestCodeRepoVersions(0xc0002bd1e0)
	/workdir/go/src/cmd/go/internal/modfetch/coderepo_test.go:825 +0xe5 fp=0xc000079f70 sp=0xc000079ef8 pc=0x7812e5
testing.tRunner(0xc0002bd1e0, 0x876c98)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "cmd/go/internal/modfetch" && test == "TestCodeRepoVersions"

2023-05-10 14:36 linux-amd64-longtest go@46847c63 cmd/go/internal/modfetch.TestCodeRepoVersions (log)

vcs-test.golang.org rerouted to http://127.0.0.1:40375
https://vcs-test.golang.org rerouted to https://127.0.0.1:38347
panic: test timed out after 15m0s
running tests:
	TestCodeRepoVersions (14m27s)
	TestCodeRepoVersions/parallel (14m27s)
	TestCodeRepoVersions/parallel/swtch.com_testmod (14m27s)

runtime.gopark(0xc000079e00?, 0x40dec5?, 0x50?, 0x36?, 0x18?)
	/workdir/go/src/runtime/proc.go:387 +0xce fp=0xc000079d98 sp=0xc000079d78 pc=0x43ae4e
runtime.chanrecv(0xc00030a3f0, 0xc000079e7f, 0x1)
	/workdir/go/src/runtime/chan.go:583 +0x3cd fp=0xc000079e10 sp=0xc000079d98 pc=0x40752d
runtime.chanrecv1(0xb43700?, 0x7b0de0?)
	/workdir/go/src/runtime/chan.go:442 +0x12 fp=0xc000079e38 sp=0xc000079e10 pc=0x407152
testing.(*T).Run(0xc0002bd1e0, {0x839a87?, 0x83ea2f?}, 0x876e48)
	/workdir/go/src/testing/testing.go:1649 +0x3c8 fp=0xc000079ef8 sp=0xc000079e38 pc=0x501548
cmd/go/internal/modfetch.TestCodeRepoVersions(0xc0002bd1e0)
	/workdir/go/src/cmd/go/internal/modfetch/coderepo_test.go:825 +0xe5 fp=0xc000079f70 sp=0xc000079ef8 pc=0x7812e5
testing.tRunner(0xc0002bd1e0, 0x876c98)

— watchflakes

[bcmills]

Looks like it was waiting ~14m for a response from swtch.com, which makes this probably another symptom of #49954.

[gopherbot]

Change https://go.dev/cl/494375 mentions this issue: cmd/go/internal/modfetch: avoid creating unused temp directories