** Description changed: - I have a dual-head setup that only presents one "screen" to X - (subdivided by xinerama). + [Impact] + xwininfo segfaults if called with an out-of-range display number. + + [Test Case] + 1. xwininfo -root -display :0.0 + 2. xwininfo -root -display :0.1 + + Actual Behavior: + * First command passes + * Second command segfaults + Expected Behavior: + * First command passes + * Second command returns an error message without segfaulting + + [Fix] + The proposed patch works as is and is proposed for both precise and quantal. + + [Regression Potential] + The patch is small and only affects an error condition check, so the chance of a regression seems very small. xwininfo is not widely used, so the impact of a regression would be minimal as well. + + [Original Report] + I have a dual-head setup that only presents one "screen" to X (subdivided by xinerama). If I run xwininfo -root -display :0.0 it works as expected, giving the root window information for my single "screen". If I run xwininfo -root -display :0.1 it segfaults. I expect it to exit gracefully with an error message. On Ubuntu 8.04 this error message used to be "cannot open display :0.1". The problem could lie in libxcb (I'm no expert) xcb_connection_has_error() no longer returning true in the -display :0.1 case, but I've attached a patch for xwininfo anyway. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: x11-utils 7.6+4 ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21 Uname: Linux 3.2.0-27-generic x86_64 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_64 Kernel Module 295.49 Mon Apr 30 23:46:33 PDT 2012 - GCC version: gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) + NVRM version: NVIDIA UNIX x86_64 Kernel Module 295.49 Mon Apr 30 23:46:33 PDT 2012 + GCC version: gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) .tmp.unity.support.test.0: - + ApportVersion: 2.0.1-0ubuntu11 Architecture: amd64 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] CompositorRunning: None Date: Tue Jul 24 16:37:34 2012 DistUpgraded: Fresh install DistroCodename: precise DistroVariant: ubuntu DkmsStatus: - nvidia-current, 295.40, 3.2.0-23-generic, x86_64: installed - nvidia-current, 295.40, 3.2.0-26-generic, x86_64: installed - nvidia-current, 295.40, 3.2.0-27-generic, x86_64: installed - nvidia-current-updates, 295.49, 3.2.0-27-generic, x86_64: installed + nvidia-current, 295.40, 3.2.0-23-generic, x86_64: installed + nvidia-current, 295.40, 3.2.0-26-generic, x86_64: installed + nvidia-current, 295.40, 3.2.0-27-generic, x86_64: installed + nvidia-current-updates, 295.49, 3.2.0-27-generic, x86_64: installed GraphicsCard: - NVIDIA Corporation G98 [Quadro NVS 295] [10de:06fd] (rev a1) (prog-if 00 [VGA controller]) - Subsystem: NVIDIA Corporation Device [10de:062e] + NVIDIA Corporation G98 [Quadro NVS 295] [10de:06fd] (rev a1) (prog-if 00 [VGA controller]) + Subsystem: NVIDIA Corporation Device [10de:062e] InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) JockeyStatus: - xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Disabled, Not in use) - xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Enabled, In use) + xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Disabled, Not in use) + xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Enabled, In use) MachineType: Dell Inc. Precision WorkStation T3500 ProcEnviron: - LANGUAGE=en_AU:en - TERM=xterm - PATH=(custom, user) - LANG=en_AU.UTF-8 - SHELL=/bin/bash + LANGUAGE=en_AU:en + TERM=xterm + PATH=(custom, user) + LANG=en_AU.UTF-8 + SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-27-generic root=UUID=2769af30-df94-44f1-9846-7241763e2193 ro quiet splash vt.handoff=7 SourcePackage: x11-utils UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/12/2010 dmi.bios.vendor: Dell Inc. dmi.bios.version: A07 dmi.board.name: 09KPNV dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 7 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA07:bd04/12/2010:svnDellInc.:pnPrecisionWorkStationT3500:pvr:rvnDellInc.:rn09KPNV:rvrA00:cvnDellInc.:ct7:cvr: dmi.product.name: Precision WorkStation T3500 dmi.sys.vendor: Dell Inc. version.compiz: compiz 1:0.9.7.8-0ubuntu1.2 version.ia32-libs: ia32-libs 20090808ubuntu36 version.libdrm2: libdrm2 2.4.32-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1 version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1028274 Title: xwininfo segfaults if given a non-existent screen with -display option To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/x11-utils/+bug/1028274/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
