Jiang Bohan 74331e2a96 test(agent): serialize fake-executable writes to avoid ETXTBSY on CI ...

TestKimiBackendInvokesACPSubcommand (and its Kimi/Codex siblings) write a
shell script to a per-test TempDir and then fork/exec it. With t.Parallel()
enabled across the package, a concurrent goroutine's fork can inherit the
still-open write fd to another test's new executable; Linux then rejects
the subsequent exec with ETXTBSY (seen as
  fork/exec /tmp/.../kimi: text file busy
on GitHub Actions).

Introduce writeTestExecutable, which holds syscall.ForkLock.RLock across
OpenFile→Write→Close. Fork (which takes ForkLock.Lock) cannot run while we
hold RLock, so no sibling fork inherits our write fd. Ran the three callers
with -count=10 under -p=1 and the full package with no failures.

2026-04-23 01:48:43 +08:00

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