The row299 root-side pair (mos-1409) spans supervisor start-up and
clean_session, which scans every /proc entry on the host. With about
1,850 processes that adds 0.6 to 1.6 s, so the unchanged inner probe read
2.5 to 3.9 s and failed the [1.25, 2.75) band, while the 1 s inner-timer
mutant read 2.06 to 2.38 s and passed. Widening the bound alone would
have kept that mutant alive.
A second observer pair, also confined to the private test copy, brackets
only the inner timer: begin just before the supervisor starts its sleep,
end at the start of finish(). It writes only for the SO_PEERCRED peer and
at most one pair. The unchanged band now applies to that interval
(2.01 s on base, 1.00 s and 3.00 s for the 1 s and 3 s mutants, so both
fail). The root pair remains required and must contain the timer pair;
probe-inner-timeout already places it before the outer bound.
jason.woltje
e588fb32cb