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[Daniel Hahler <launchpad@xxxxxxxxxx>]

Thanks for your bug report.

Is this still an issue?
Have you tried it in a later Ubuntu release / with a more recent version of libxcb (the report was against 1.8.1-2ubuntu2.1)? 

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

** Changed in: libxcb (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1211274

Title:
  xcb_wait_for_reply deadlock

Status in libxcb package in Ubuntu:
  Incomplete

Bug description:
  I have a Qt application which hangs in startup. Stack trace:

  (gdb) bt
  #0  0xb77b5424 in __kernel_vsyscall ()
  #1  0xb3d2084b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
  #2  0xb2a1337b in ?? () from /usr/lib/i386-linux-gnu/libxcb.so.1
  #3  0xb2a14b40 in ?? () from /usr/lib/i386-linux-gnu/libxcb.so.1
  #4  0xb2a14e07 in xcb_wait_for_reply () from /usr/lib/i386-linux-gnu/libxcb.so.1
  #5  0xb2a3bd0b in xcb_glx_query_version_reply () from /usr/lib/i386-linux-gnu/libxcb-glx.so.0
  #6  0xa08a5740 in ?? () from /usr/lib/i386-linux-gnu/qt5/plugins/platforms/libqxcb.so
  #7  0xa08a8b9a in ?? () from /usr/lib/i386-linux-gnu/qt5/plugins/platforms/libqxcb.so
  #8  0xa08aa2f9 in ?? () from /usr/lib/i386-linux-gnu/qt5/plugins/platforms/libqxcb.so
  #9  0xa08bb1f9 in ?? () from /usr/lib/i386-linux-gnu/qt5/plugins/platforms/libqxcb.so
  #10 0xb41f57f9 in ?? () from /usr/lib/i386-linux-gnu/libQt5Gui.so.5
  #11 0xb41fccf4 in QGuiApplicationPrivate::createPlatformIntegration() () from /usr/lib/i386-linux-gnu/libQt5Gui.so.5
  #12 0xb41fd704 in QGuiApplicationPrivate::createEventDispatcher() () from /usr/lib/i386-linux-gnu/libQt5Gui.so.5
  #13 0xb482bd4b in QApplicationPrivate::createEventDispatcher() () from /usr/lib/i386-linux-gnu/libQt5Widgets.so.5
  #14 0xb3f46972 in QCoreApplication::init() () from /usr/lib/i386-linux-gnu/libQt5Core.so.5
  #15 0xb3f469f9 in QCoreApplication::QCoreApplication(QCoreApplicationPrivate&) () from /usr/lib/i386-linux-gnu/libQt5Core.so.5
  #16 0xb41fe12a in QGuiApplication::QGuiApplication(QGuiApplicationPrivate&) () from /usr/lib/i386-linux-gnu/libQt5Gui.so.5
  #17 0xb47d8de8 in QApplication::QApplication(int&, char**, int) () from /usr/lib/i386-linux-gnu/libQt5Widgets.so.5

  
  Google shows other reports about xcb_wait_for_reply deadlocking. This happens when starting the application
  from .xsession file using nodm display manager. Starting the app from an x terminal works so i believe this is some kind of timing issue / race condition. The app in question is properietary so i cannot supply it to reproduce the issue, sorry.

  Ubuntu version is Ubuntu 13.04 x86_32 with updates installed.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: libxcb1 1.8.1-2ubuntu2.1
  ProcVersionSignature: Ubuntu 3.8.0-28.41-generic 3.8.13.5
  Uname: Linux 3.8.0-28-generic i686
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86 Kernel Module  304.88  Wed Mar 27 14:31:12 PDT 2013
   GCC version:  gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: i386
  CheckboxSubmission: 5411b7083f2413511daec522a712c016
  CheckboxSystem: b845c366ea09c60efa3a45c1b5b21525
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,workarounds,scale,expo,ezoom]
  CompositorRunning: None
  Date: Mon Aug 12 14:09:50 2013
  DistUpgraded: 2013-05-22 13:40:23,672 DEBUG enabling apt cron job
  DistroCodename: raring
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  GraphicsCard:
   NVIDIA Corporation GT216M [NVS 5100M] [10de:0a2c] (rev a2) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1521]
  InstallationDate: Installed on 2011-06-14 (790 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  JockeyStatus:
   kmod:nvidia_310_updates - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
   kmod:nvidia_313_updates - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
   kmod:nvidia_304 - nvidia_304 (Proprietary, Enabled, Not in use)
   kmod:nvidia_304_updates - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
   kmod:nvidia_310 - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
  MachineType: Hewlett-Packard HP EliteBook 8540p
  MarkForUpload: True
  PccardctlStatus:
   Socket 0:
     3.3V
    16-bit
    PC Card
     Subdevice 0 (function 0) bound to driver "pata_pcmcia"
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-28-generic root=UUID=debfbf8b-faee-4fef-887f-aaa61947d6d2 ro crashkernel=384M-2G:64M,2G-:128M quiet splash
  SourcePackage: libxcb
  UpgradeStatus: Upgraded to raring on 2013-05-22 (82 days ago)
  XorgConf:
   Section "Device"
   	Identifier	"Default Device"
   	Option	"NoLogo"	"True"
   EndSection
  dmi.bios.date: 03/09/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68CVD Ver. F.0F
  dmi.board.name: 1521
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 32.33
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68CVDVer.F.0F:bd03/09/2011:svnHewlett-Packard:pnHPEliteBook8540p:pvr:rvnHewlett-Packard:rn1521:rvrKBCVersion32.33:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 8540p
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.9~daily13.06.19~13.04-0ubuntu1
  version.libdrm2: libdrm2 2.4.43-0ubuntu1.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.4-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.4-0ubuntu0.1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.6-0ubuntu4.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1
  xserver.bootTime: Mon Aug 12 10:00:08 2013
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   open /dev/dri/card0: No such file or directory
   open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.13.3-0ubuntu6

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