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Date:      Fri, 2 Jun 2017 09:48:17 -0700
From:      Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com>
To:        Ian Smith <smithi@nimnet.asn.au>
Cc:        Raimo Niskanen <raimo+freebsd@erix.ericsson.se>,  FreeBSD Questions Mailing List <freebsd-questions@freebsd.org>
Subject:   Re: Advice on kernel panics
Message-ID:  <CAOgwaMsBW3qb+FaR=9jLeZVyqrnzacFf5=Os=CuVrRqVAG1cQw@mail.gmail.com>
In-Reply-To: <20170601235447.C98304@sola.nimnet.asn.au>
References:  <mailman.103.1496318402.46813.freebsd-questions@freebsd.org> <20170601235447.C98304@sola.nimnet.asn.au>

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On Thu, Jun 1, 2017 at 7:34 AM, Ian Smith <smithi@nimnet.asn.au> wrote:

> In freebsd-questions Digest, Vol 678, Issue 4, Message: 4
> On Thu, 1 Jun 2017 10:27:49 +0200 Raimo Niskanen <
> raimo+freebsd@erix.ericsson.se> wrote:
>  > On Thu, Jun 01, 2017 at 12:10:30AM -0500, Doug McIntyre wrote:
>  > > On Mon, May 29, 2017 at 11:20:43AM +0200, Raimo Niskanen wrote:
>  > > > I have a server that panics about every 3 days and need some advice
> on how
>  > > > to handle that.
>  > >
>  > > I'd expect it is some sort of hardware failure, as I would expect
>  > > kernel panics more on the order of once a decade with FreeBSD. Ie.
>  > > I've seen one or two on my hundred or so servers, but its pretty rare.
>  > >
>  > > Check and recheck your hardware items.
>  >
>  > I have removed one of four memory capsules - panicked again.  Will
> rotate
>  > through all of them...
>  >
>  > >
>  > > Runup memtest86+. Check your drive hardware, turn on SMART checking.
>  >
>  > I have run memtest86+ over night - no errors found.
>  >
>  > I have installed smartmontools - no errors found, short and long self
> tests
>  > on both disks run fine.  zpool scrub repaired 0 errors and has no known
> data
>  > errors.
>
> Everyone's suggesting hardware problems, and it's certainly worthwhile
> eliminating that possibility - but this could be a software/OS issue.
>
> If it were me and hardware all checks out, I'd try posting the original
> report - plus other details about the box and setup that you've since
> mentioned - to freebsd-stable@, or maybe freebsd-fs@ since those fstat
> reports seem to point to possible FS/zfs issues? at a wild guess ..
>
> One other hardware tester you might try is sysutils/stress which can
> pound CPU, I/O, VM, disk as hard and for as long as you like, without
> having to bring the box down.  I've used this lots to generate heavy
> loads.  Keep a close eye on system temperatures during longer tests.
>
> Ah, just before posting, I see your latest with dmesg.  Just on a quick
> scan, I wonder if these are a bad indication?  Maybe just a side-issue,
> but powerd might not work, so again heat might be something to watch:
>
>  est0: <Enhanced SpeedStep Frequency Control> on cpu0
>  est: CPU supports Enhanced Speedstep, but is not recognized.
>
> cheers, Ian
> _______________________________________________
>
>





"Panics about every three days" may suggest another software problem :


With respect to your executed programs , system resources , especially
memory or OS data structures , may be allocated , but not freed properly
without any warning message ( or message may be missed ) . When OS requires
to do a process , but there is no a sufficient resource , a panic may be
triggered ( without background reasons ) .



To isolate this possibility , if ever is possible to find the panic point (
in the sense of a routine in a source file ) , it may show an important
clue to proceed a more fruitful way to solve the problem .

Mehmet Erol Sanliturk



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