coder

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Yevhenii Shcherbina dcdca814d6 chore: fix pty-max-limit flake (#22147 )

### Notes
- Closes https://github.com/coder/internal/issues/558
- I closed previous attempt with `ptySemaphore`:
https://github.com/coder/coder/pull/21981
- We can consider implementing the retries proposed by Spike in:
https://github.com/coder/coder/pull/21981#pullrequestreview-3783200423,
if increasing the limit isn’t enough.
- I looked into Datadog — this particular test doesn’t seem very flaky
right now. It failed once in the Nightly gauntlet (3 weeks ago), but it
hasn’t failed again in the last 3 months (at least I couldn’t find any
other failures in Datadog).

## Fix PTY exhaustion flake on macOS CI

### Problem
macOS CI runners were experiencing PTY exhaustion during test runs,
causing flakes. The default PTY limit on macOS is 511, which can be
insufficient when running parallel tests.

### Solution
Added a CI step to increase the PTY limit on macOS runners from the
default 511 to the maximum allowed value of 999 before running tests.

### Changes
- Added `Increase PTY limit (macOS)` step in `.github/workflows/ci.yaml`
- Sets `kern.tty.ptmx_max=999` using `sysctl` (maximum value on our CI
runners)
- Runs only on macOS runners before the test-go-pg action

2026-02-18 08:38:35 -05:00

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