flake: CI infrastructure issue - Go module download (lint)

[flake-investigator]

CI Run: https://github.com/coder/coder/actions/runs/29506257762
Failed Job: lint
Commit: f7481c5d081f144b2f1daaf586bb3b0789a295e8 (author: Cian Johnston)
Failure date: 2026-07-16

Failure:

../../../go/pkg/mod/github.com/fergusstrange/embedded-postgres@v1.34.0/decompression.go:10:2: github.com/xi2/xz@v0.0.0-20171230120015-48954b6210f8: read "https://proxy.golang.org/github.com/xi2/xz/@v/v0.0.0-20171230120015-48954b6210f8.zip": stream error: stream ID 43; INTERNAL_ERROR; received from peer
make: *** [Makefile:157: _gen/bin/dbdump] Error 1

Error analysis:

• Failure occurred during make lint while downloading Go modules needed for _gen/bin/dbdump.
• The Go module proxy returned an INTERNAL_ERROR on a module zip download.
• No panic/OOM/data-race indicators observed; error is consistent with transient network/proxy failure.

Root cause classification: Infrastructure (Go module proxy/network flake).

Assignment analysis:

• git log --oneline -10 .github/workflows/ci.yaml shows recent CI workflow owners.
• The most relevant recent CI infra change is 304f127 ("remove the go-cache action") by @ethanndickson, which is closest to Go module download/caching behavior in CI.
• Assigning to @ethanndickson for CI infrastructure triage.

Related issues search (coder/internal):

• "proxy.golang.org"
• "stream error"
• "github.com/xi2/xz"
• closed issues updated in last 30 days with "proxy.golang.org" or "go: downloading"
  No matches found.

Reproduction:

• Re-run the lint job; failure appears transient and proxy-dependent.

[linear-code]

ENG-3051

[flake-investigator]

New occurrence:

• CI Run: https://github.com/coder/coder/actions/runs/29918947599
• Failed Job: test-e2e (make coder)
• Commit: 507ce504f81af690b556b7254189cd05d7e7f455 (author: Danielle Maywood)
• Failure date: 2026-07-22

Failure evidence:

pty/pty_linux.go:6:2: github.com/u-root/u-root@v0.14.0: read "https://proxy.golang.org/github.com/u-root/u-root/@v/v0.14.0.zip": stream error: stream ID 1; INTERNAL_ERROR; received from peer
make: *** [Makefile:1694: site/e2e/bin/coder] Error 1

Notes:

• Same Go module proxy INTERNAL_ERROR pattern as prior occurrences; appears transient network/proxy flake.