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Today's Topics:
1. Diagnosing a machine that freezes intermittently (James Womack)
2. Re: Diagnosing a machine that freezes intermittently
(Keith Edmunds)
3. Re: Diagnosing a machine that freezes intermittently (david)
4. Re: Diagnosing a machine that freezes intermittently
(Alex Butcher (LUG))
5. Re: Diagnosing a machine that freezes intermittently
(James Womack)
6. Re: Diagnosing a machine that freezes intermittently
(James Womack)
----------------------------------------------------------------------
Message: 1
Date: Sat, 15 Mar 2014 17:06:15 +0000
From: James Womack <5inowsy1maiq@gmail.com>
To: bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: [bristol] Diagnosing a machine that freezes intermittently
Message-ID: <53248887.1000804@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi,
I have a desktop which I use as a home server, running Ubuntu 13.10
(with the standard Gnome-based GUI, for occasional HTPC usage), which I
mainly use to host personal git repositories and a WebDAV share using
Apache. In recent weeks the machine has been freezing intermittently,
about every few days. When it freezes, it becomes unresponsive to input
and the display is either blank, or frozen to a single frame. It can
then only be turned off by holding down the power button on the box.
I have done some basic testing, as I initially thought it might be due
to some issue with the display manager (lightdm), but this turned out
to not be the case (I switched to gdm, and the problem remained).
I feel like a userspace program should not be able to freeze my system
in this way. Perhaps a display manager could, though, if it interacted
with the graphics drivers in a way which crashed the kernel...
I would like to try to diagnose the source of the problem. It could be
hardware or software based. If I could narrow it down to either one of
these, that would be really useful. If I could at least find the general
software/hardware area that is involved in the freezes, I could start
looking at bug reports, or swapping out pieces of hardware. I am not
really sure where to start. Are there standard Linux log files which
persist after a crash which could be perused? Maybe I can increase the
verbosity of logging to obtain more useful information?
Any help or suggestions would be appreciated,
James
------------------------------
Message: 2
Date: Sat, 15 Mar 2014 17:44:25 +0000
From: Keith Edmunds <kae@midnighthax.com>
To: bristol@mailman.lug.org.uk
Subject: Re: [bristol] Diagnosing a machine that freezes
intermittently
Message-ID: <20140315174425.51ee2d31@ws.the.cage>
Content-Type: text/plain; charset=US-ASCII
First thing to do: run memtest86+ overnight.
--
Blog: http://goo.gl/iOwv1w
"You can't live a perfect day without doing something for someone
who will never be able to repay you."
------------------------------
Message: 3
Date: Sat, 15 Mar 2014 21:21:20 +0000
From: david <david@avoncliff.com>
To: bristol@mailman.lug.org.uk
Subject: Re: [bristol] Diagnosing a machine that freezes
intermittently
Message-ID: <5324C450.2070400@avoncliff.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> I would like to try to diagnose the source of the problem. It could be
> hardware or software based. If I could narrow it down to either one of
> these, that would be really useful. If I could at least find the general
> software/hardware area that is involved in the freezes, I could start
> looking at bug reports, or swapping out pieces of hardware. I am not
> really sure where to start. Are there standard Linux log files which
> persist after a crash which could be perused? Maybe I can increase the
> verbosity of logging to obtain more useful information?
>
> Any help or suggestions would be appreciated,
> James
>
Can you SSH into it when it freezes?
------------------------------
Message: 4
Date: Sat, 15 Mar 2014 21:37:40 +0000
From: "Alex Butcher (LUG)" <lug@assursys.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>,
James Womack <5inowsy1maiq@gmail.com>, bristol and Bath Linux User
Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Diagnosing a machine that freezes
intermittently
Message-ID: <72d77ea3-e39c-4e46-b238-e16541904277@email.android.com>
Content-Type: text/plain; charset="utf-8"
My money would be on a fancy screensaver causing the graphics card driver to crash the machine.
On 15 March 2014 17:06:15 GMT+00:00, James Womack <5inowsy1maiq@gmail.com> wrote:
>Hi,
>
>I have a desktop which I use as a home server, running Ubuntu 13.10
>(with the standard Gnome-based GUI, for occasional HTPC usage), which I
>
>mainly use to host personal git repositories and a WebDAV share using
>Apache. In recent weeks the machine has been freezing intermittently,
>about every few days. When it freezes, it becomes unresponsive to input
>
>and the display is either blank, or frozen to a single frame. It can
>then only be turned off by holding down the power button on the box.
>
>I have done some basic testing, as I initially thought it might be due
>to some issue with the display manager (lightdm), but this turned out
>to not be the case (I switched to gdm, and the problem remained).
>
>I feel like a userspace program should not be able to freeze my system
>in this way. Perhaps a display manager could, though, if it interacted
>with the graphics drivers in a way which crashed the kernel...
>
>I would like to try to diagnose the source of the problem. It could be
>hardware or software based. If I could narrow it down to either one of
>these, that would be really useful. If I could at least find the
>general
>software/hardware area that is involved in the freezes, I could start
>looking at bug reports, or swapping out pieces of hardware. I am not
>really sure where to start. Are there standard Linux log files which
>persist after a crash which could be perused? Maybe I can increase the
>verbosity of logging to obtain more useful information?
>
>Any help or suggestions would be appreciated,
>James
>
>_______________________________________________
>Bristol mailing list
>Bristol@mailman.lug.org.uk
>https://mailman.lug.org.uk/mailman/listinfo/bristol
--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.
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Message: 5
Date: Sat, 15 Mar 2014 22:40:40 +0000
From: James Womack <5inowsy1maiq@gmail.com>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Diagnosing a machine that freezes
intermittently
Message-ID: <5324D6E8.10809@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On 15/03/14 21:21, david wrote:
>
>> I would like to try to diagnose the source of the problem. It could be
>> hardware or software based. If I could narrow it down to either one of
>> these, that would be really useful. If I could at least find the general
>> software/hardware area that is involved in the freezes, I could start
>> looking at bug reports, or swapping out pieces of hardware. I am not
>> really sure where to start. Are there standard Linux log files which
>> persist after a crash which could be perused? Maybe I can increase the
>> verbosity of logging to obtain more useful information?
>>
>> Any help or suggestions would be appreciated,
>> James
>>
> Can you SSH into it when it freezes?
>
>
>
> _______________________________________________
> Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol
No, it is totally unresponsive. It does not respond to pings, either.
------------------------------
Message: 6
Date: Sat, 15 Mar 2014 22:45:41 +0000
From: James Womack <5inowsy1maiq@gmail.com>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Diagnosing a machine that freezes
intermittently
Message-ID: <5324D815.4090506@gmail.com>
Content-Type: text/plain; charset="utf-8"
On 15/03/14 21:37, Alex Butcher (LUG) wrote:
> My money would be on a fancy screensaver causing the graphics card
> driver to crash the machine.
>
> On 15 March 2014 17:06:15 GMT+00:00, James Womack
> <5inowsy1maiq@gmail.com> wrote:
>
> Hi,
>
> I have a desktop which I use as a home server, running Ubuntu 13.10
> (with the standard Gnome-based GUI, for occasional HTPC usage), which I
> mainly use to host personal git repositories and a WebDAV share using
> Apache. In recent weeks the machine has been freezing intermittently,
> about every few days. When it freezes, it becomes unresponsive to input
> and the display is either blank, or frozen to a single frame. It can
> then only be turned off by holding down the power button on the box.
>
> I have done some basic testing, as I initially thought it might be due
> to some issue with the display manager (lightdm), but this turned out
> to not be the case (I switched to gdm, and the problem remained).
>
> I feel like a userspace program should not be able to freeze my system
> in this way. Perhaps a display manager could, though, if it interacted
> with the graphics drivers in a way which
> crashed the kernel...
>
> I would like to try to diagnose the source of the problem. It could be
> hardware or software based. If I could narrow it down to either one of
> these, that would be really useful. If I could at least find the general
> software/hardware area that is involved in the freezes, I could start
> looking at bug reports, or swapping out pieces of hardware. I am not
> really sure where to start. Are there standard Linux log files which
> persist after a crash which could be perused? Maybe I can increase the
> verbosity of logging to obtain more useful information?
>
> Any help or suggestions would be appreciated,
> James
>
> ------------------------------------------------------------------------
>
> Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol
>
>
> --
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
Thanks for the suggestion, but I do not run a screensaver, I simply
blank the screen and have it set to turn off the display after a few
minutes. The recent versions of Ubuntu (with the standard Unity DE)
actually haven't included graphical screensavers. However, I am
suspicious of the graphics card driver, since I have an nVidia card and
use a nVidia's binary blob driver. Probably will switch to the open
source driver to try to eliminate this possible problem after I have
looked into a couple of other things.
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End of Bristol Digest, Vol 541, Issue 5
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