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Date:      Mon, 2 Dec 2013 20:40:11 +0000
From:      dgmm <freebsd01@dgmm.net>
To:        freebsd-questions@freebsd.org
Subject:   Re: System reboots ~3am during daily periodic 450.status-security run
Message-ID:  <201312022040.11070.freebsd01@dgmm.net>
In-Reply-To: <529C4213.2010307@sdf.org>
References:  <201312012352.01075.freebsd01@dgmm.net> <20131202071502.a72c0029.freebsd@edvax.de> <529C4213.2010307@sdf.org>

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On Monday 02 December 2013 08:17:23 cary wrote:
> Polytropon wrote:
> > On Mon, 2 Dec 2013 00:27:18 +0000, dgmm wrote:
> >> On Sunday 01 December 2013 23:52:00 dgmm wrote:
> >>> My system reboots at 3am when /etc/periodic/daily/450.status-security
> >> 
> >> I've now narrowed it down to:
> >> 
> >> /etc/periodic/security/100.chksetuid
> >> 
> >> ...but have no idea why it might a catastophic crash/reboot.
> > 
> > A wild guess: File system damage side effect that is being
> > triggered by something "non-obvious". To make sure this is
> > _not_ the case, reboot into SUM or via live media and perform
> > a forced (!) file system check. Note that just in case you
> > might think "but I run background fsck and preen, that should
> > be sufficient" - it's not; there are few things that only a
> > full, _normal_ file system check can detect and repair.
> > 
> > I'm mentioning this because similar situations have been
> > discussed on this list, and finally there was some strange
> > file system defect responsible...
> > 
> > But also make sure system power is good, and the system does
> > not become unstable when on load.
> 
> Had a 3 a.m. reboot last week.
> /usr was corrupted because of my own
> errors made while compiling ports.
> 
> $ fsck -t ufs -fv /dev/{usr-partition}

Thanks both of you.  I now know why the phrase "blindingly obvious" was 
coined.

fsck found an error on / and another on /home.
(Yes,I followed the advice in the handbook to not go with seperate /usr and 
/var.  I think if I ever rebuild from scratch I'll go back to the old way.)

I've manually  run   /etc/periodic/security/100.chksetuid twice without 
incident.

This does bring to mind something I'd not previously thought of.  Except for 
the rare times I leave a job running overnight, periodic never runs.  I'll 
have a to make a decision on what to do about that.  I have a coupleof options 
in mind, all of which have ups and downs.

-- 
Dave



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