relogin fails with black screen, Xorg high load

[Gerben]

Using a desktop with two users, it often hangs switching from one to another. The console comes unresponsive, even text-only (ctrl-alt-f2) does not show. System itself still runs, I can login over SSH. Process for Xorg shows one full cpu used.

The system came up from hybernate, the graphical display showed password entry for other user, the switch towared the one user showed the password entry for the one user. After entering the password the display turns black, with ctrl-alt-f2 not responding either.

Via ssh I can produce the following: (3-core cpu):

top - 09:27:16 up 8 days, 7:06, 8 users, load average: 3,00, 2,82, 1,84
Tasks: 281 total, 2 running, 279 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0,2 us, 33,4 sy, 0,0 ni, 66,3 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 8176516 total, 7891016 used, 285500 free, 132652 buffers
KiB Swap: 8384508 total, 112 used, 8384396 free. 3028468 cached Mem

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 1074 root 20 0 591924 422764 18976 R 97,8 5,2 14:10.38 Xorg
32539 root 20 0 0 0 0 S 2,3 0,0 0:13.09 kworker/1:0
 1148 kernoops 20 0 37144 1008 688 S 0,3 0,0 0:05.44 kerneloops
 2622 geus 20 0 28004 1776 1172 R 0,3 0,0 0:00.12 top

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5
Uname: Linux 3.11.0-19-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Sun Apr 27 09:18:02 2014
DistUpgraded: 2014-04-19 02:20:42,663 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus: fglrx, 13.350.1, 3.11.0-19-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Park [Mobility Radeon HD 5430] [1002:68e1] (prog-if 00 [VGA controller])
   Subsystem: PC Partner Limited / Sapphire Technology Caicos [Radeon HD 5450] [174b:6000]
InstallationDate: Installed on 2014-04-08 (18 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 004 Device 002: ID 046d:c03e Logitech, Inc. Premium Optical Wheel Mouse (M-BT58)
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-19-generic root=/dev/mapper/ubuntu--vg-root ro noapic quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to trusty on 2014-04-19 (8 days ago)
dmi.bios.date: 12/04/2009
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: ASUS M3N78 PRO ACPI BIOS Revision 1402
dmi.board.name: M3N78 PRO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: 1.XX
dmi.chassis.asset.tag: 123456789000
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrASUSM3N78PROACPIBIOSRevision1402:bd12/04/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM3N78PRO:rvr1.XX:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
version.fglrx-installer: fglrx-installer N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Sat Apr 19 02:21:22 2014
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input Logitech USB-PS/2 Optical Mouse MOUSE, id 8
 input AT Translated Set 2 keyboard KEYBOARD, id 9
xserver.errors:
 open /dev/dri/card0: No such file or directory
 open /dev/fb0: No such file or directory
 AIGLX error: failed to open /usr/X11R6/lib64/modules/dri/fglrx_dri.so, error[/usr/X11R6/lib64/modules/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
 AIGLX error: failed to open /usr/lib64/dri/fglrx_dri.so, error[/usr/lib64/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
 AIGLX error: failed to open /usr/X11R6/lib/modules/dri/fglrx_dri.so, error[/usr/X11R6/lib/modules/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2
xserver.video_driver: fglrx

[Gerben (gerbgeus)]

dmesg shows info for processes 1195 and 4463:

root@dan-09:/var/log# ps auxw | grep X
root 1074 97.5 5.1 591924 422764 tty9 Rs+ 09:12 31:32 /usr/bin/X -core :2 -seat seat0 -auth /var/run/lightdm/root/:2 -nolisten tcp vt9 -novtswitch
root 1195 0.0 7.3 921044 598664 tty7 Ds+ apr19 7:08 /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
root 2944 0.0 0.0 14700 932 pts/48 S+ 09:45 0:00 grep --color=auto X
root 4463 1.0 17.6 1695388 1441288 tty8 Ds+ apr19 118:22 /usr/bin/X -core :1 -seat seat0 -auth /var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch

I think I'm using an external driver for the videocard:
ii fglrx 2:13.350.1-0ubuntu2 amd64 Video driver for the AMD graphics accelerators
ii fglrx-amdcccle 2:13.350.1-0ubuntu2 amd64 Catalyst Control Center for the AMD graphics accelerators

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[proligde (proligde)]

I'm quite sure this problem affects me as well. Unfortunately my linux knowledge seems insufficient to track this problem down properly so I can only add some observations since upgrading my workstation to 14.04LTS :

* arbitrarily the load jumps from normal (between 0 and 3 during standard desktop workstation operations) to exactly 15 but(!) without really slowing the system down except for delays when switching users or trying to log in or out. This often (but not exclusively) happens after resuming from a lock screen.

* iostats yields NO write/read load during high load

* top yiels NO task excessively or exclusively consuming any CPU

* there are no network shares mounted

* a reboot solves this problem for several hours again.

* shutdown hangs on Askingh all remaining processes to terminate - No error is shown but I have to hard-reset the pc. (as far as I can see after unmounting all filesystems - I had no fs problems regarding this issue so far)

[proligde (proligde)]

After weeks of being unable to track down the problem it seems to have disappeared for me. Since it was not reproducable and the load was not connected to any task I can only guess if it's been fixed by a regular update or if it's related to my deinstallation of the "virtualbox" package, although virtualbox was never run while the problem occured.

Unscientific Conclusion: If you have weird load problems as of 14.04 and the virtualbox package installed: Try if deinstalling helps. I'm sorry I can't add anything more substantial to this.

[Aapo Rantalainen (aapo-rantalainen)]

This happens me too.

Always reproducible, steps:
a) start computer
b) verify that Xorg is using some 0.7% CPU
c) lock the screen
d) login back
-> Xorg uses 97 ... 105% CPU
Wait over ten minutes and it will not cool down.
('sudo killall Xorg' helps)

-----
Step c) could be suspend/hibernate too, because they implies screen locking.
-----
Also changing to the tty (i.e. ctrl-alt-f1) triggers xorg to use ~100% CPU.
----
Virtualbox mentioned earlier: I have virtualbox installed, but not running ('lsmod | grep vbox' gives hits).

[penalvch (penalvch)]

Gerben, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal as it will automatically gather and attach updated debug information to this report:

apport-collect -p xorg 1313275

Please ensure you have xdiagnose installed, and that you click the Yes button for attaching additional debugging information. As well, please note given that the information from the prior release is already available, doing this on a release prior to the development one would not be helpful.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]