misc/60009: /etc/daily: overlong run protection

["campbell+netbsd%mumble.net@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60009
>Category:       misc
>Synopsis:       /etc/daily: overlong run protection
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    misc-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 16 02:10:00 +0000 2026
>Originator:     Taylor R Campbell
>Release:        current, 11, 10, 9, ...
>Organization:
The NetBSDaily Collision, Inc.
>Environment:
>Description:

	If /etc/daily takes longer than a day to run, the same cron job
	might start running again the next day.  If something is
	hanging, there may be indefinite growth of hung /etc/daily jobs
	without feedback.

	Same with /etc/weekly, /etc/monthly.

>How-To-Repeat:

	echo sleep $((86400*365)) >>/etc/daily.local

>Fix:

	Take a lock, say /var/run/daily.lock, with flock(1).  If it's
	already taken, report a hung daily job by mail instead of
	hanging any more.