Date: Wed, 9 Dec 2015 11:11:44 -0600 From: Dustin Wenz <dustinwenz@ebureau.com> To: Jan Bramkamp <crest@rlwinm.de> Cc: freebsd-stable@freebsd.org Subject: Re: Periodic jobs triggering panics in 10.1 and 10.2 Message-ID: <19A6FFCC-6B3A-44EB-B96F-D02F98364C3F@ebureau.com> In-Reply-To: <56680148.9070601@rlwinm.de> References: <34FA7D40-8758-460D-AC14-20B21D2E3F8D@ebureau.com> <1449619470.31831.9.camel@michaeleichorn.com> <56680148.9070601@rlwinm.de>
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PF filed: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D205163 Please let me know if there is any more useful information I can = include. - .Dustin Wenz > On Dec 9, 2015, at 4:24 AM, Jan Bramkamp <crest@rlwinm.de> wrote: >=20 >=20 >=20 > On 09/12/15 01:04, Michael B. Eichorn wrote: >> On Tue, 2015-12-08 at 16:31 -0600, Dustin Wenz wrote: >>> I suspect this is a zfs bug that is triggered by the access patterns >>> in the periodic scripts. There is significant load on the system = when >>> the scheduled processes start, because all jails execute the same >>> scripts at the same time. >>>=20 >>> I've been able to alleviate this problem by disabling the security >>> scans within the jails, but leave it enabled on the root host. >>=20 >> To avoid the problem of jails all starting things at the same time, = use >> the cron(8) flags -j and -J to set a 'jitter' which will cause cron = to >> sleep for a random period of specified duration (60 sec max). Cron >> flags can be set using the rc.conf variable 'cron_flags'. >=20 > While jitter would reduce the resource contention a thundering herd of = cronjobs shouldn't cause the kernel to divide by zero. Spreading the = load by introducing jitter to cronjobs might hide the problem, but it = still needs further analysis. >=20 > @Dustin Wenz: Can you reproduce the problem and file a PR to track = this? > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to = "freebsd-stable-unsubscribe@freebsd.org"
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