[natty intel 945gme kde] Xorg crashes when exiting fullscreen with KDE set to suspend effects for fullscreen windows

[Zorael]

Kubuntu natty, packages up-to-date as of 2011-04-17. No ppas added, so mesa packages are version 7.10.2-0ubuntu1, xorg-server packages are version 1.10.0.902-1ubuntu1, -video-intel is version 2.14.0-4ubuntu7 and KDE packages are version 4.6.2-0ubuntu1. Please reassign bug if the bug is not in mesa.

When exiting a fullscreen window (eg Flash, fullscreen games) with KDE's desktop effects set to suspend effects when any such are fullscreened, Xorg crashes. Reproducible everytime and stops happening if that option is disabled in the Advanced tab of the Desktop Effects kcm module, perhaps to the detriment of performance.

  Backtrace:
  0: /usr/bin/X (xorg_backtrace+0x3b) [0x80a531b]
  1: /usr/bin/X (0x8048000+0x60808) [0x80a8808]
  2: (vdso) (__kernel_rt_sigreturn+0x0) [0xbbf40c]
  3: /usr/lib/dri/i915_dri.so (intelClearWithBlit+0x162) [0x41b742]
  4: /usr/lib/dri/i915_dri.so (0x3fc000+0x18670) [0x414670]
  5: /usr/lib/dri/libdricore.so (_mesa_Clear+0x172) [0x1015512]
  6: /usr/lib/xorg/modules/extensions/libglx.so (0x35d000+0x7fd9) [0x364fd9]
  7: /usr/lib/xorg/modules/extensions/libglx.so (0x35d000+0x351b0) [0x3921b0]
  8: /usr/lib/xorg/modules/extensions/libglx.so (0x35d000+0x3813f) [0x39513f]
  9: /usr/bin/X (0x8048000+0x282c7) [0x80702c7]
  10: /usr/bin/X (0x8048000+0x1a81c) [0x806281c]
  11: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0x1b8e37]
  12: /usr/bin/X (0x8048000+0x1a411) [0x8062411]
  Segmentation fault at address 0x30

Even with -dbg packages installed I could not get a better backtrace.

How to reproduce:
1. Enable KDE's desktop effects if not already enabled
2. Go to System Settings -> Desktop Effects, Advanced tab and check Suspend desktop effects for fullscreen windows
3. Open a browser (Chromium in this case)
4. Navigate to a youtube clip
5. Play and hit fullscreen
6. Exit fullscreen
7. Observe complete Xorg crash

As Xorg crashes you're returned to the kdm login screen - however a "broken" kded remains in memory, which prevents new wireless connections being established. It won't exit by itself, it won't exit when sent SIGTERM, has to be sent SIGKILL. That is perhaps a different bug, but worthy of mention to emphasize bug importance. The user has to reboot to be able to use Xorg again with a wireless connection, alternatively switch to a tty and kill the kded process before logging in again.

[madbiologist (me-again)]

This might be fixed by the upcoming xserver-xorg-video-intel 2.16.0 driver - see http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/ and https://bugs.freedesktop.org/show_bug.cgi?id=37700

[penalvch (penalvch)]

Zorael, thank you for reporting this and helping make Ubuntu better. As per https://wiki.ubuntu.com/Releases, Kubuntu Natty reached EOL on October 28, 2012.

Is this reproducible on a supported release?