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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1465377

Title:
  Change login while other user is logged in: sometimes
  crashes/freezes/hangs

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  When trying to login with a user account while another user is already
  logged in, Ubuntu sometimes crashes/hanges/freezes!

  This bug exists for many years, so for many Ubuntu versions - even in
  the latest LTS versions with fresh standard installation (Unity), 64
  Bit. During the years of this bug, I had different computers
  (hardware) with different graphics cards (nVidia, AMD) different
  Ubuntus (32 Bit, 64 Bit, LTS, non-LTS). This bug bugs us for so many
  years because we have two computers (exchanged every couple of years
  with fresh Ubuntu installations) that each has multiple login accounts
  (for all family members). Every once in a while one user wants to
  login while another is already logged in. The login screen allowws to
  login while another user is logged in, so this should basically work.
  Other scenario is, the the logged in user simple loggs in to another
  user via the system menu (top right).

  The results are miscellanious: sometimes it works, sometimes, the
  graphics get distorted, sometimes, the screen just turns black
  (sometimes with a white cursopr line blinking), sometimes it freezes,
  sometimes it crashes. All in all: it's very unstable and buggy.

  Last messages in /var/log/kernel.log:

  ---------------------
  ...
  Jun 15 19:53:11 PC-M kernel: [   17.365242] type=1400 audit(1434390791.618:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=867 comm="apparmor_parser"
  Jun 15 19:53:11 PC-M kernel: [   17.365253] type=1400 audit(1434390791.618:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/cupsd" pid=867 comm="apparmor_parser"
  Jun 15 19:53:11 PC-M kernel: [   17.365575] type=1400 audit(1434390791.618:10): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=867 comm="apparmor_parser"
  Jun 15 19:53:11 PC-M kernel: [   17.417132] r8169 0000:01:00.0 eth0: link down
  Jun 15 19:53:11 PC-M kernel: [   17.417157] r8169 0000:01:00.0 eth0: link down
  Jun 15 19:53:11 PC-M kernel: [   17.417203] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
  Jun 15 19:53:11 PC-M kernel: [   17.417589] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
  Jun 15 19:53:11 PC-M kernel: [   17.429647] type=1400 audit(1434390791.682:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/lightdm/lightdm-guest-session" pid=923 comm="apparmor_parser"
  Jun 15 19:53:12 PC-M kernel: [   18.455730] fglrx_pci 0000:00:01.0: irq 86 for MSI/MSI-X
  Jun 15 19:53:12 PC-M kernel: [   18.456922] <6>[fglrx] Firegl kernel thread PID: 1358
  Jun 15 19:53:12 PC-M kernel: [   18.457010] <6>[fglrx] Firegl kernel thread PID: 1359
  Jun 15 19:53:12 PC-M kernel: [   18.457112] <6>[fglrx] Firegl kernel thread PID: 1360
  Jun 15 19:53:12 PC-M kernel: [   18.457222] <6>[fglrx] IRQ 86 Enabled
  Jun 15 19:53:12 PC-M kernel: [   18.465425] <6>[fglrx] Reserved FB block: Shared offset:0, size:1000000 
  Jun 15 19:53:12 PC-M kernel: [   18.465427] <6>[fglrx] Reserved FB block: Unshared offset:f9b4000, size:4000 
  Jun 15 19:53:12 PC-M kernel: [   18.465429] <6>[fglrx] Reserved FB block: Unshared offset:f9b8000, size:548000 
  Jun 15 19:53:12 PC-M kernel: [   18.465430] <6>[fglrx] Reserved FB block: Unshared offset:ff00000, size:100000 
  Jun 15 19:53:12 PC-M kernel: [   18.465431] <6>[fglrx] Reserved FB block: Unshared offset:7ffd7000, size:29000 
  Jun 15 19:53:12 PC-M kernel: [   18.520520] <6>[fglrx] ATIF platform detected with notification ID: 0x81
  Jun 15 19:53:13 PC-M kernel: [   18.962467] <3>[fglrx:IRQMGR_callback_hifreq_interrupt] *ERROR* irqSourceID = 0x60000400 is unknown
  Jun 15 19:53:13 PC-M kernel: [   19.553859] r8169 0000:01:00.0 eth0: link up
  Jun 15 19:53:13 PC-M kernel: [   19.553876] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
  Jun 15 19:53:41 PC-M kernel: [   47.439360] audit_printk_skb: 153 callbacks suppressed
  Jun 15 19:53:41 PC-M kernel: [   47.439363] type=1400 audit(1434390821.722:63): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=3231 comm="apparmor_parser"
  Jun 15 19:53:41 PC-M kernel: [   47.439370] type=1400 audit(1434390821.722:64): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=3231 comm="apparmor_parser"
  Jun 15 19:53:41 PC-M kernel: [   47.439688] type=1400 audit(1434390821.722:65): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=3231 comm="apparmor_parser"
  ----------------------

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.13.0-52.86-generic 3.13.11-ckt18
  Uname: Linux 3.13.0-52-generic x86_64
  NonfreeKernelModules: fglrx
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,maximumize,compiztoolbox,decor,resize,gnomecompat,snap,grid,move,imgpng,extrawm,vpswitch,unitymtgrabhandles,place,mousepoll,wall,regex,session,animation,fade,expo,workarounds,scale,ezoom,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Mon Jun 15 20:23:28 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus: fglrx-updates-core, 15.200, 3.13.0-52-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Kaveri [Radeon R7 200 Series] [1002:130f] (prog-if 00 [VGA controller])
     Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:0123]
  InstallationDate: Installed on 2014-09-13 (274 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-52-generic root=UUID=45c777b5-e370-47a4-b762-bd3254d9699e ro nomodeset quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg crash
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/25/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F5c MX
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: F2A88X-D3H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF5cMX:bd03/25/2014:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnF2A88X-D3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
  version.fglrx-installer: fglrx-installer N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.4
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.6
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Mon Jun 15 19:53:12 2015
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   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: 2:1.15.1-0ubuntu2.7
  xserver.video_driver: fglrx

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