sleep(3) sometimes too sleepy on FreeBSD 8.0?
john.marshall at riverwillow.com.au
Tue Feb 23 21:13:11 UTC 2010
On Tue, 23 Feb 2010, 11:36 +0200, Kostik Belousov wrote:
> On Tue, Feb 23, 2010 at 12:35:22PM +1100, John Marshall wrote:
> > Environment: sendmail 8.14.4 on FreeBSD 8.0-RELEASE-p2
> > Since upgrading a few local servers to FreeBSD 8.0-RELEASE (and
> > subsequently 8.0-RELEASE-p2), I have been seeing VERY intermittent
> > problems with sendmail persistent queue runners. One or more queue
> > runners will fail to wake up (having been told to sleep for either 1 or
> > 5 seconds) and mail accumulates in their queue group queues.
> > I have only seen this about 4 times but at least once on each of the
> > three 8.0 servers. I've been seeing something like one occurrence per
> > fortnight overall. The first few times I re-started sendmail. On
> > Saturday I spent longer looking at it.
> I think the best way to collect the data would be ktrace the queue runners,
> preferrably starting the ktrace before they are stuck.
OK. I've caught one of them (different server from Saturday).
PID TT STAT TIME COMMAND
48501 ?? Ss 0:14.77 sendmail: accepting connections (sendmail)
48502 ?? S 1:00.24 sendmail: running queue: /var/spool/mqueue/qd1/df (sendmail)
48503 ?? S 0:38.11 sendmail: running queue: /var/spool/mqueue/mby/df (sendmail)
48504 ?? I 0:27.34 sendmail: running queue: /var/spool/mqueue/oz/df (sendmail)
48505 ?? S 0:37.59 sendmail: running queue: /var/spool/mqueue/rw2/df (sendmail)
48506 ?? S 0:34.93 sendmail: running queue: /var/spool/mqueue/hold/df (sendmail)
My ktrace file was created with 'ktrace -g 48501'. I have the result of
'kdump -R -p 48504' available at:
The affected queue group was empty. I have redirected messages for that
domain to a different queue group so that I can leave that queue runner
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