Date: Wed, 24 Feb 2010 08:13:06 +1100 From: John Marshall <john.marshall@riverwillow.com.au> To: freebsd-stable@freebsd.org Subject: Re: sleep(3) sometimes too sleepy on FreeBSD 8.0? Message-ID: <20100223211306.GI2303@rwpc12.mby.riverwillow.net.au> In-Reply-To: <20100223093616.GO50403@deviant.kiev.zoral.com.ua> References: <20100223013522.GE2303@rwpc12.mby.riverwillow.net.au> <20100223093616.GO50403@deviant.kiev.zoral.com.ua>
next in thread | previous in thread | raw e-mail | index | archive | help
--9Ek0hoCL9XbhcSqy Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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 > >=20 > > 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. > >=20 > > 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. >=20 > I think the best way to collect the data would be ktrace the queue runner= s, > 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/d= f (sendmail) My ktrace file was created with 'ktrace -g 48501'. I have the result of 'kdump -R -p 48504' available at: <http://www.riverwillow.net.au/~john/8_0/rwsrv04_201002240725.kdump.gz>; 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 stuck. --=20 John Marshall --9Ek0hoCL9XbhcSqy Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAkuEROIACgkQw/tAaKKahKKSWgCcDNneP07yDQBrWMjQENXgajSw 5O0AnjwZvc8wqLZ4MMKqD6dLZVpPqRQ4 =8gY4 -----END PGP SIGNATURE----- --9Ek0hoCL9XbhcSqy--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100223211306.GI2303>