test_core_then_signal_crash_is_rejected_without_core_dump flaked on the
2026-09-11 pre-flight: its fake child (a fresh Python interpreter that
prints the startup marker and SIGSEGVs itself) has to reach the crash
inside a 250 ms observation window. On a loaded runner it did not; the
deadline expired with the child alive, the shutdown SIGTERM raced the
self-inflicted SIGSEGV, and the smoke rejected the run as "unexpected
process exit status -11" instead of the "exited before" the test asserts.
The early-exit fakes now get a 5 s window — free, since observe() returns
the moment the child exits — while the four live-process fakes keep their
explicit 250 ms so the suite still runs in ~2 s.
cc
vicrodh
743d68fda4