Freezing system

Chris cpollock at embarqmail.com
Thu Jan 22 16:46:43 UTC 2015


On Thu, 2015-01-22 at 11:21 -0500, Scott Blair wrote:
> On 01/22/2015 10:17 AM, Chris wrote:
> > On Thu, 2015-01-22 at 10:06 -0500, Scott Blair wrote:
> >> On 01/22/2015 07:29 AM, Chris wrote:
> >>> On Thu, 2015-01-22 at 01:22 -0500, Scott Blair wrote:
> >>>> I am running Ubuntu 14.04. I have all the updates that have been issued.
> >>>> Sometimes my system will freeze rendering the keyboard useless. However
> >>>> the mouse still works. But clicking on anything doesn't work. But today when
> >>>> it froze, while I was watching an imbedded video, I could click on the
> >>>> status
> >>>> bar and hear that it changed places, even though the status bar icon did not
> >>>> move. While the video was frozen, the audio was still working. My CPU
> >>>> status,
> >>>> net status and clock even stops, I have the clock showing seconds to make
> >>>> sure it froze up.
> >>>>
> >>>> I write down the times it freezes and look at the syslog file, but to my
> >>>> untrained eye, I don't see anything. I have yet to find, in the syslog
> >>>> file, the
> >>>> time that it froze up. Am I looking in the right place? Should I be
> >>>> looking at
> >>>> other logs? Any idea on what to look for?
> >>>>
> >>>> -- 
> >>>>
> >>>>
> >>>> Scott Blair
> >>>>
> >>>> Save on backup time BackupDevice=null
> >>>>
> >>>>
> >>> Scott, this sounds exactly the same issue I've reported a bug on at
> >>> Launchpad - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402331
> >>> and that has also been reported here -
> >>> https://bugs.freedesktop.org/show_bug.cgi?id=75394 if you'll notice I've
> >>> mentioned that everything on my machine will freeze up except the cursor
> >>> can still be moved. One other oddity about this bug is that even though
> >>> it appears to be 'frozen' my background operations are still going on.
> >>> For instance fetchmail is still polling for mail, procmail is still
> >>> processing it. Spamassassin, ClamAV and Freshclam are all still working
> >>> as they should. If you'll notice in my sig that I'm running a 3.19*
> >>> kernel which I was asked to do from the bug report on Launchpad. I have
> >>> experienced two lockups since doing that however neither one have shown
> >>> the 'hangcheck....' error in my syslog. I'll be attempting to do as
> >>> asked which is to 'bisect' a kernel. 
> >>>
> >>> HTH
> >>>
> >>> Chris
> >>>
> >>>
> >> This is my output:
> >> Scott at Main:~$ uname -a
> >> Linux Main 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC 2014
> >> x86_64 x86_64 x86_64 GNU/Linux
> >> Scott at Main:~$
> >>  So upgrading the kernel has no effect. Because your background
> >>  operations are still running, could it be a unity thing and not a
> >> system thing.
> >>
> >> -- 
> >>
> >>
> >> Scott Blair
> >>
> >> Save on backup time BackupDevice=null
> >>
> >>
> > Don't think so Scott, I'm still learning Ubuntu however I'm running the
> > Gnome desktop. If you look at the bug report at the freedesktop.org link
> > I sent you can see that it affects not only Ubuntu or a particular
> > computer mfgr, ie..I run a Dell Optiplex 780. 
> >
> Yeah I saw that. Wishful thinking. I just upgraded to the 3.16.0 kernel.
> We will see how it goes.
> Any idea on what logs I should be looking at when this happens?
> 
If you see this in your syslog - kernel: [214866.808010]
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render
ring idle

this is what's being reported on both bugs. Take a look at the lshw
output on the freedesktop report and notice all the different OS this
affects and hardware. I've gone from the 3.13 to the 3.19rc kernels and
all of these are affected. I've even updated the BIOS on my box from A03
which is old to A15 with no affect as was suggested on Launchpad. Also
in my /etc/default/grub file I've put this in

GRUB_CMDLINE_LINUX_DEFAULT="drm.debug=0x66"

which again was suggested in one or the other of the bug reports.
Another file that can be looked at is /var/log/dmesg which may or may
not give any information.

Chris


-- 
Chris
KeyID 0xE372A7DA98E6705C
31.11°N 97.89°W (Elev. 1092 ft)
10:40:05 up 23:50, 1 user, load average: 0.31, 0.33, 0.32
Ubuntu 14.04.1 LTS, kernel 3.19.0-031900rc5-generic




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