Kernel Oops during boot

[David Anderson]

System crash during boot. First encountered when booting
3.13.0-63-generic #103-Ubuntu on restart after upgrade
from 3.13.0-62. that crashes the same way during boot.

I tried using grub and booted into 3.13.0-62 but that
behaved the same. The data that should be here

System remounts disk readonly
and boots. I can ssh in to the system (but being read only
cannot change anything).

Ran memory test overnight (about 1.5 complete cycles
of the test) and no errors.

(on the --63)
uname -a
Linux Dseti3.home 3.13.0-63-generic #103-Ubuntu SMP Fri Aug 14 21:42:59 UTC 2015
 x86_64 x86_64 x86_64 GNU/Linux

Two nVidia GTX 760 GPUs.
Using nVidia drivers because using OpenCL for boinc Seti@home
and Einstein@home.

I removed one GPU (as a test) and reboot encountered the same problem.

Suggestions as to how to figure out what is wrong would
be most welcome.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-62-generic 3.13.0-62.102
ProcVersionSignature: Ubuntu 3.13.0-62.102-generic 3.13.11-ckt24
Uname: Linux 3.13.0-62-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.12
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D9p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Sat Sep 5 10:21:35 2015
HibernationDevice: RESUME=UUID=7d28a6a1-b165-4bc2-b6e4-285bdedf6465
InstallationDate: Installed on 2011-01-23 (1685 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: Supermicro X8DTN
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-62-generic root=UUID=670968bd-3485-489a-8498-0a508f833e0a ro quiet splash nomodeset
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-62-generic N/A
 linux-backports-modules-3.13.0-62-generic N/A
 linux-firmware 1.127.15
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-07-21 (411 days ago)
dmi.bios.date: 10/06/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080016
dmi.board.asset.tag: 1234567890
dmi.board.name: X8DTN
dmi.board.vendor: Supermicro
dmi.board.version: 2.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 17
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 1234567890
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080016:bd10/06/2010:svnSupermicro:pnX8DTN:pvr1234567890:rvnSupermicro:rnX8DTN:rvr2.0:cvnSupermicro:ct17:cvr1234567890:
dmi.product.name: X8DTN
dmi.product.version: 1234567890
dmi.sys.vendor: Supermicro

[Brad Figg (brad-figg)]

This change was made by a bot.

[David Anderson (davea42)]

Just to show a bit of the same issue when booting 3.13.0-63,
attached is /var/log/kern.log from -63.

[David Anderson (davea42)]

Booting off a 14.04 live cd works fine.
Mounting the system disks read-write works fine.

[David Anderson (davea42)]

Installed 14.04 on second drive from CD with primary disc unconnected..

Boot off of secondary disc with primary disconnected
using default 14.04 settings and
driver and the system comes up with xfce properly.

Attempted to boot off secondary disk with grub with both
connected but that failed. I note that Grub listed Ubuntu
10.10 for the secondary but that make no sense now
since I just replaced the old 10.10 on
the secondary disk with 14.04 (clean install).
dmesg on second drive boot 14.04 shows nouveau
driver.

I'm as puzzled as ever. No idea how to proceed
to identify the problem with the primary or fix it.

[David Anderson (davea42)]

Ok. Rewiring to have the secondary disk only I was able to
boot of secondary and that worked.

Rewired back to 2 disks, primary as primary in the wiring.

In grub booted into recovery mode.

Used the dpkg option to get updated and remount as rw.

Got into root shell from grub extended manu and did
   apt-get remove 'nvidia*'
The quotes being essential.
Should probably have done purge, but..did not.
That removed the nvidia and did some kernel stuff.
exited shell and (as the on screen note warned)
only got back to a root shell. Shutdown.
Then rebooted and the system restarts normally! Yay!

The question, of course, is when I reinstall nvidia
what will happen? But at least the sytem boots and lightdm
runs now, normally. And I know how to get back to this state.

[David Anderson (davea42)]

All back to normal running nVidia drivers.

For 14.04 ignore advice about /etc/X11/xorg.conf. Irrelevant.
Instead, boot into recovery mode in the grub menu.

Go into a shell (root shell) from the grub recovery menu.
# make read-write
mount -o remount,rw /
# remove nvidia packages.
apt-get purge 'nvidia*'
exit

The apt-get command needs the quotes
around nvidia*.

You will get a warnng that the first reboot might not be
enough. I had to boot twice.

Now in the Settings->Addtional Drivers
select the nvidia driver you want.

Then
sudo apt-get install nvidia-modprobe

Now reboot and all will, I hope, be good
for you too.

Problem solved.

[David Anderson (davea42)]

I don't know why things went wrong on the minor kernel upgrade, but
my problem is fixed so this bug can, I suppose, be closed.