Hourly cron jobs running to early

[Konstantin Belousov]

On Mon, Jun 30, 2014 at 02:03:31PM +0100, cdr.nil at gmail.com wrote:
> Folks,
> 
> I, too, am seeing a problem of cron running jobs a few seconds too early.
> This is on a Thinkpad T42 running:
> 
> FreeBSD cobalt 10.0-RELEASE-p6 FreeBSD 10.0-RELEASE-p6 #3 r267829M: Wed Jun
> 25 07:41:33 BST 2014     root at cobalt:/usr/obj/usr/src/sys/GENERIC  i386
> 
> BIOS clock is running UTC and is under ntpd control.
> 
> I noticed this on a logging cron job that is supposed to run on the hour.
> These are the last few timings:
> 
> 03:59:47
> 04:59:12
> 05:59:47
> 06:59:47
> 07:59:47
> 08:59:47
> 09:59:47
> 10:59:47
> 11:59:47
> 12:59:47
> 
The head r261146, merged to stable/10 as r261231, seems to be
relevant.

> Best Regards,
> Mark Willson
> 
> -----Original Message-----
> From: owner-freebsd-stable at freebsd.org
> [mailto:owner-freebsd-stable at freebsd.org] On Behalf Of Spil Oss
> Sent: 30 June 2014 10:05
> To: freebsd-stable at freebsd.org
> Subject: Hourly cron jobs running to early
> 
> Hi,
> 
> A system I manage that was recently upgraded from 9 to 10.0 and to a
> later version of VMWare vSphere (5.5U1) is no longer running hourly
> jobs at the top of the hour but just before. This is especially
> annoying for newsyslog that doesn't then cycle logfiles that are set
> to daily rotation.
> 
> grep -E " (00|23):" /var/log/cron.log
> Jun 25 23:59:34 gw /usr/sbin/cron[94620]: (root) CMD (newsyslog)
> Jun 26 00:59:51 gw /usr/sbin/cron[95380]: (root) CMD (newsyslog)
> Jun 26 23:59:12 gw /usr/sbin/cron[21259]: (root) CMD (newsyslog)
> Jun 27 00:59:34 gw /usr/sbin/cron[22036]: (root) CMD (newsyslog)
> Jun 27 23:59:25 gw /usr/sbin/cron[49211]: (root) CMD (newsyslog)
> Jun 28 00:59:34 gw /usr/sbin/cron[49968]: (root) CMD (newsyslog)
> Jun 28 23:58:55 gw /usr/sbin/cron[83459]: (root) CMD (newsyslog)
> Jun 29 00:59:51 gw /usr/sbin/cron[84221]: (root) CMD (newsyslog)
> Jun 29 23:59:51 gw /usr/sbin/cron[6571]: (root) CMD (newsyslog)
> Jun 30 00:59:51 gw /usr/sbin/cron[7327]: (root) CMD (newsyslog)
> 
> ntpd is configured on the server and working fine
> # ntpdate -q ntp1.nl.uu.net
> server 193.79.237.14, stratum 1, offset -0.000250, delay 0.02942
> 30 Jun 10:54:50 ntpdate[19771]: adjust time server 193.79.237.14
> offset -0.000250 sec
> 
> Looking at all hourly newsyslog jobs for a day
> 14:59:51 15:59:47 16:58:42 17:59:51 18:59:55 19:59:55 20:59:51
> 21:59:12 22:59:34 23:59:51 23:59:51 23:59:51 00:59:51 01:58:42
> 02:59:29 03:59:47 04:59:51 05:59:47 06:59:38 07:59:51 08:59:42
> 09:58:42 10:58:42
> I don't really see a pattern in this
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