Bohan Jiang c2df5d786d test(execenv): fix flaky Windows prepare-helper deadlock (MUL-4923) (#5676) ...

The windows-execenv job's TestPrepareIsolated_WindowsKillsDescendantBeforeRetry
flakes on the Windows runner: its helper subprocess ends in a bare select{},
which the Go runtime can reap with 'all goroutines are asleep - deadlock!'
(exit status 2) once every goroutine is parked with no wakeup source. That
races the parent's Job Object kill, so PrepareIsolated returns 'helper failed'
instead of the context.Canceled the test asserts.

Block on a timer-backed sleep loop instead: a pending timer is a wakeable
source, so the runtime never declares a deadlock, and the process still dies
the instant the Job Object tears the tree down.

Co-authored-by: Bohan-J <bohan@devv.ai>
Co-authored-by: multica-agent <github@multica.ai>

2026-07-20 16:15:41 +08:00

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