cmd/go/internal/modfetch: TestCodeRepo failures

[gopherbot]

#!watchflakes
default <- pkg == "cmd/go/internal/modfetch" && test == "TestCodeRepo"

Issue created automatically to collect these failures.

Example (log):

vcs-test.golang.org rerouted to http://127.0.0.1:46001
https://vcs-test.golang.org rerouted to https://127.0.0.1:40743
--- FAIL: TestCodeRepo (0.00s)
    --- FAIL: TestCodeRepo/github.com_rsc_vgotest1_v2/v2.0.1 (22.11s)
        coderepo_test.go:623: repo.Stat("v2.0.1"): github.com/rsc/vgotest1/v2@v2.0.1: invalid version: git fetch -f origin refs/heads/*:refs/heads/* refs/tags/*:refs/tags/* in /tmp/workdir/tmp/gitrepo-test-62827515/modcache/cache/vcs/4a5198d614ab1a6ef5a42101e7276bebd49f61fe11c77b35a3eeaaa999be6485: exit status 128:
            	error: RPC failed; HTTP 400 curl 22 The requested URL returned error: 400
            	fatal: expected flush after ref listing

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/go/internal/modfetch" && test == "TestCodeRepo"

2024-04-30 15:35 linux-arm64-longtest go@150f45b2 cmd/go/internal/modfetch.TestCodeRepo (log)

vcs-test.golang.org rerouted to http://127.0.0.1:46001
https://vcs-test.golang.org rerouted to https://127.0.0.1:40743
--- FAIL: TestCodeRepo (0.00s)
    --- FAIL: TestCodeRepo/github.com_rsc_vgotest1_v2/v2.0.1 (22.11s)
        coderepo_test.go:623: repo.Stat("v2.0.1"): github.com/rsc/vgotest1/v2@v2.0.1: invalid version: git fetch -f origin refs/heads/*:refs/heads/* refs/tags/*:refs/tags/* in /tmp/workdir/tmp/gitrepo-test-62827515/modcache/cache/vcs/4a5198d614ab1a6ef5a42101e7276bebd49f61fe11c77b35a3eeaaa999be6485: exit status 128:
            	error: RPC failed; HTTP 400 curl 22 The requested URL returned error: 400
            	fatal: expected flush after ref listing

— watchflakes