The script-timeout path used a site-local process-group kill, which
cannot reach a grandchild that created its OWN session (start_new_session
background jobs, watchdogs). Such descendants kept running after the job
reported failure (#71148, #59549). Migrate the timeout handler to the
unified deadline layer's kill_process_tree (#85147, d6a5cb9725): psutil
snapshots the descendant set before signalling, so own-session
grandchildren are reached too. Fallback to the site-local group kill if
the import ever fails, so the path cannot re-wedge.
The explicit script-timeout message stays the classification anchor
(#85536's contract), keeping cron timeouts distinct from provider
timeouts.
Salvage additions on review (#85125 Phase 4a):
- migrate the sibling kill site too — the cancel_event/"ownership was
lost" path orphaned setsid grandchildren the same way (whole-bug-class
rule); pinned by test_cancel_path_also_tree_kills
- proc.poll() early-return in _terminate_cron_script_tree so a script
that exits right at the deadline doesn't log a spurious "no signal"
warning (mirrors _terminate_cron_script_process); pinned by
test_already_exited_proc_is_left_alone
- acceptance test's script timeout 1s -> 2s: interpreter startup under
CI load could eat the whole 1s window before the spawner wrote its
pid file
- note: kill_process_tree hard-kills (SIGKILL) immediately, whereas the
old path gave a 1s SIGTERM grace window; intended for a deadline-
expiry hard stop (both docstrings say "hard stop")
Based on #86791 by @ayushnangia; cherry-picked to preserve authorship.
Co-authored-by: dante32683 <dante32683@users.noreply.github.com>
Co-authored-by: supotato-ipj <supotato-ipj@users.noreply.github.com>
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dante32683
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