#111617 review (andrexibiza P1 #3/#4, kvnloo nit):
- worker_started_at persisted only gateway.status.get_process_start_time(): on Linux that
is /proc/<pid>/stat field 22, clock ticks since THIS boot. The threat is a row surviving
a reboot, and that counter does not, so an unrelated process on a later boot with the
same PID and the same tick value passed _start_times_agree(). The fingerprint is now
"<gateway.drain_control.current_instantiation_epoch()>|<start>" (boot_id + PID-1 start,
the witness the drain marker already uses); both halves must match. Integer values on
rows written before this change keep the start-time-only comparison.
- A failed capture persisted NULL, which _pid_recycled treats as the legacy pre-fingerprint
row and falls back to bare PID existence - a new spawn silently recreated the #89614/
#99558 kill authority. A failed capture now persists UNVERIFIED_WORKER_FINGERPRINT: the
claim is held while the PID is live (never released beside it, never SIGTERM/SIGKILLed
by timeout, stale-claim, manual reclaim, archive or the terminal reaper) and reclaimed
once it is gone. NULL stays legacy-only.
- Every tasks UPDATE that nulls worker_pid nulls worker_started_at too (archive_task and
the reclaim/timeout/reopen paths): the fingerprint is part of the kill-authority tuple
and must not outlive its pid.
Live (real sleeper child): reboot-shaped row (same pid, same tick, other boot id) ->
reclaimed to ready, child untouched; matching fingerprint -> SIGTERM delivered, exit -15.
tests/hermes_cli/test_kanban_worker_pid_fingerprint.py: +2 hostile tests, both red on base.
Not changed: the check-then-act window between _pid_recycled and kill (kvnloo P2) is
real but needs pidfd_open/pidfd_send_signal (Linux 5.3+) to close atomically; left as
the documented residual of "never kills a DETECTED recycled PID".
teknium1
db54f5448d