I'm experiencing the same bug in Ubuntu 12.04 precise since I have upgraded from xserver-xorg-lts-precise to xserver-xorg-lts-quantal, I'm using Nouveau nvidia driver.
My xserver crashes each time I click into an image with a tool : selection or paint... Gimp works when I'm running gimp outside gnome with openbox for example Error logs : [ 24003.038] (EE) [ 24003.038] (EE) Backtrace: [ 24003.038] (EE) 0: /usr/bin/X (xorg_backtrace+0x34) [0x7f30c86f3644] [ 24003.038] (EE) 1: /usr/bin/X (0x7f30c853e000+0x1b9599) [0x7f30c86f7599] [ 24003.038] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f30c7864000+0xfcb0) [0x7f30c7873cb0] [ 24003.038] (EE) 3: /usr/bin/X (0x7f30c853e000+0x663da) [0x7f30c85a43da] [ 24003.038] (EE) 4: /usr/bin/X (0x7f30c853e000+0x5fce0) [0x7f30c859dce0] [ 24003.038] (EE) 5: /usr/bin/X (0x7f30c853e000+0x1474b8) [0x7f30c86854b8] [ 24003.038] (EE) 6: /usr/bin/X (0x7f30c853e000+0x557a1) [0x7f30c85937a1] [ 24003.038] (EE) 7: /usr/bin/X (0x7f30c853e000+0x4415a) [0x7f30c858215a] [ 24003.038] (EE) 8: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed) [0x7f30c64ea76d] [ 24003.038] (EE) 9: /usr/bin/X (0x7f30c853e000+0x444b1) [0x7f30c85824b1] [ 24003.038] (EE) [ 24003.038] (EE) Segmentation fault at address 0x28 [ 24003.038] Fatal server error: [ 24003.038] Caught signal 11 (Segmentation fault). Server aborting [ 24003.038] [ 24003.038] (EE) Please consult the The X.Org Foundation support at http://wiki.x.org for help. [ 24003.038] (EE) Please also check the log file at "/var/log/Xorg.1.log" for additional information. [ 24003.038] (EE) [ 24003.039] (II) evdev: Power Button: Close [ 24003.039] (II) UnloadModule: "evdev" [ 24003.039] (II) evdev: Video Bus: Close [ 24003.039] (II) UnloadModule: "evdev" [ 24003.040] (II) evdev: Video Bus: Close [ 24003.040] (II) UnloadModule: "evdev" [ 24003.040] (II) evdev: Power Button: Close [ 24003.040] (II) UnloadModule: "evdev" [ 24003.040] (II) evdev: Sleep Button: Close [ 24003.040] (II) UnloadModule: "evdev" [ 24003.041] (II) evdev: Laptop_Integrated_Webcam_2HDM: Close [ 24003.041] (II) UnloadModule: "evdev" [ 24003.041] (II) evdev: Logitech USB Optical Mouse: Close [ 24003.041] (II) UnloadModule: "evdev" [ 24003.041] (II) evdev: AT Translated Set 2 keyboard: Close [ 24003.041] (II) UnloadModule: "evdev" [ 24003.044] (II) evdev: Dell WMI hotkeys: Close [ 24003.044] (II) UnloadModule: "evdev" [ 24003.044] (II) UnloadModule: "synaptics" [ 24003.044] (II) AIGLX: Suspending AIGLX clients for VT switch [ 24003.596] Server terminated with error (1). Closing log file. Please reopen the bug ! -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1021517 Title: Xorg-server crashes reproducible with GIMP usage To manage notifications about this bug go to: https://bugs.launchpad.net/gimp/+bug/1021517/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp