ubuntu-x-swat team mailing list archive

[Zorael <763461@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: mesa (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/763461

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