flake: TestAgent_Startup/HomeDirectory

[flake-investigator]

CI Failure Details

CI Run: https://github.com/coder/coder/actions/runs/27441018780
Failed Job: https://github.com/coder/coder/actions/runs/27441018780/job/81114905940 (test-go-pg (windows-2022))
Commit: d6aa3d61ee4ad38b60d887641ff8084f4b676c2b (TJ) coder/coder@d6aa3d6

Failing Test

TestAgent_Startup/HomeDirectory

File: agent/agent_test.go (around line ~2249)

Error Output (panic / timeout)

=== FAIL: agent  (0.00s)
panic: test timed out after 20m0s
	running tests:
		TestAgent_Startup/HomeDirectory (19m57s)

Error Analysis

The agent package hit the Go test watchdog timeout on Windows. The running test list shows TestAgent_Startup/HomeDirectory stuck for ~20 minutes, indicating a hang in startup/manifest resolution or agent setup on Windows.

Root Cause Assessment

Process timeout / hang in TestAgent_Startup/HomeDirectory on Windows CI.

Data Race / OOM Checks

Searched logs for WARNING: DATA RACE, out of memory, signal: killed — none found. Failure is a Go test timeout panic.

Assignment Analysis

Intended blame command:

• git blame -L 2242,2275 agent/agent_test.go

Proxy via history (available tooling):

• git log --oneline -10 --follow agent/agent_test.go
  • Most recent substantive change touching this area: 3955df79 ("fix(agent): unify working directory resolution") by Mathias Fredriksson.

Assigning to @mafredri as the most recent modifier of the working directory resolution + startup test area.

Related Issues

Searched coder/internal for:

• TestAgent_Startup / TestAgent_Startup/HomeDirectory
• agent_test.go + Startup
• test timed out after 20m + agent

No matching issues found.

Reproduction

go test ./agent -run TestAgent_Startup/HomeDirectory -count=1

[linear-code]

ENG-2875

[flake-investigator]

New occurrence:

CI run: https://github.com/coder/coder/actions/runs/27932462496 (job: https://github.com/coder/coder/actions/runs/27932462496/job/82646969570, test-go-pg windows-2022)
Commit: bc9cc8cb08f4dd040cc462e473b30e0dd8cdbc5d (Ethan) coder/coder@bc9cc8c
Failure date: 2026-06-22 06:16:12Z

Panic evidence:

=== FAIL: agent  (0.00s)
panic: test timed out after 20m0s
	running tests:
		TestAgent_Startup/HomeDirectory (19m59s)
		TestAgent_Startup/HomeEnvironmentVariable (19m59s)

Same Windows timeout/hang in TestAgent_Startup subtests.