[t3dotgg]

Problem

CodexAuthCallback.test.ts > allows two accounts to complete independently failed in CI on two unrelated branches (#37039, #28839) with "The ChatGPT callback port is in use on this computer". The test called freePort() twice in a row. freePort() binds port 0, reads the port, and closes the socket, so the kernel can return the same port on the next call. The second sign-in listener then fails with EADDRINUSE. On Linux, 5 of 20,000 back-to-back bind/close pairs returned the same port.

Change

New freePorts(count) holds every probe socket open until all ports are read, then closes them. The two-account test uses freePorts(2). freePort() now calls freePorts(1). Test-only.

Scope

CI flake fix, test-only. No issue: the CI runs above show the failure, and the cause is visible in the test helper.

Verification

• Old code with freePort() forced to return the same port twice: fails 3/3 with the CI error.
• Fixed file: 5/5 runs pass (4 tests each).
• vp run check:changed: format, lint, knip, typecheck, and test pass.
• Not checked: the general window between closing a probe socket and the product listening, where another process could take the port. Every test in this file has that window, and it is much rarer.

Reviewed with sol-loop: 1 pass with GPT-6.1 Sol. Sol verdict: approved

Made by Claude Opus 5.5 in Claude Code (T3 Code).

🤖 Generated with Claude Code

[macroscopeapp]

Approvability

Verdict: Approved at 34ab586

Macroscope's review found this PR approvable — All changes are confined to repository-ignored paths and were assessed on that basis without reconstructing excluded contents. The supplied context identifies no material risk requiring human judgment.

Notes:

• No code objects were reviewed. Approvability was decided on eligibility alone.

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