F1: PendingEval.SoftExpired runs on the pipe reader and completed the
caller's outcome inline (production outcomes have no async continuations, by
design, because results resume on the ResultDispatcher). The caller's code
(the runner's Cancel write, the seam's publish) therefore ran on the reader,
which could hold up heartbeats (a false silence kill) and, with blocking I/O,
write to the pipe from the reader. The soft outcome is now posted to the
dispatcher like a result. Test: a 1.5 s continuation on a soft timeout with a
300 ms silence limit resumes on ScriptWorker[t].Results and the worker lives
(before: it resumed on the Reader).
F2: after a transport timeout ("worker unresponsive"), a late soft notice
armed G but nobody sent Cancel, so a polling script could not end itself and
the whole worker was killed at notice + G with a kill strike. PendingEval now
exposes LateSoftExpiry (asynchronous continuations, cancelled when the run
answers); the runner sends the Cancel and counts the timeout
(NoteTimeout) from it. A genuinely slow script whose notice is delayed past
T + G is thus still a timeout. Test: stall past T + G, thaw, a polling
script overruns T: the worker survives G and the key is quarantined for
timeouts, not a hard deadline (before: the worker was killed).
Joseph Doherty
c5dffbd8b8