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[aldebx <aldebx@xxxxxxxx>]

I experience exactly the same problems as rubo77, and especially (but
not limited to) when opening multiple windows or menus in Thunderbird. I
also have exactly the same software/hardware configuration, except my
video card is Intel(R) HD Graphics 5000.

In my case the crash log is:

[128915.663] (WW) xf86CloseConsole: KDSETMODE failed: Input/output error
[128915.663] (WW) xf86CloseConsole: VT_GETMODE failed: Input/output error
[128915.663] (EE) 
Fatal server error:
[128915.663] (EE) xf86CloseConsole: VT_ACTIVATE failed: Input/output error
[128915.663] (EE) 
[128915.663] (EE) 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
[128915.663] (EE) Please also check the log file at "/var/log/Xorg.1.log" for additional information.
[128915.663] (EE) 
[128915.663] (EE) 
[128915.663] (EE) Backtrace:
[128915.665] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7f5876bfb556]
[128915.665] (EE) 1: /usr/bin/X (0x7f5876a48000+0x1b7749) [0x7f5876bff749]
[128915.666] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f587470e000+0x352f0) [0x7f58747432f0]
[128915.666] (EE) 3: /usr/bin/X (0x7f5876a48000+0x1be015) [0x7f5876c06015]
[128915.666] (EE) 4: /usr/bin/X (CloseWellKnownConnections+0x2f) [0x7f5876bfc49f]
[128915.666] (EE) 5: /usr/bin/X (0x7f5876a48000+0x1bf6f9) [0x7f5876c076f9]
[128915.666] (EE) 6: /usr/bin/X (0x7f5876a48000+0x1c051d) [0x7f5876c0851d]
[128915.666] (EE) 7: /usr/bin/X (0x7f5876a48000+0xbd801) [0x7f5876b05801]
[128915.666] (EE) 8: /usr/bin/X (xf86CloseConsole+0x153) [0x7f5876b06123]
[128915.666] (EE) 9: /usr/bin/X (ddxGiveUp+0x75) [0x7f5876ae1245]
[128915.666] (EE) 10: /usr/bin/X (0x7f5876a48000+0x5c539) [0x7f5876aa4539]
[128915.666] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f587472ea40]
[128915.666] (EE) 12: /usr/bin/X (0x7f5876a48000+0x4662e) [0x7f5876a8e62e]
[128915.666] (EE) 
[128915.666] (EE) Segmentation fault at address 0x98
[128915.666] (EE) 
FatalError re-entered, aborting
[128915.666] (EE) Caught signal 11 (Segmentation fault). Server aborting
[128915.666] (EE) 

** Summary changed:

- lightdm crashes on window open in Ubuntu 15.10 Yoga 2 Pro
+ lightdm crashes on window open in Ubuntu 15.10 intel

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https://bugs.launchpad.net/bugs/1509846

Title:
  lightdm crashes on window open in Ubuntu 15.10 intel

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  On Ubuntu 15.10 I get crashes, when I open a new window in an already
  started application. It happens irregularely, but I can force the
  crash if I open several new message windows in thunderbird. But it
  also happens in other applilcations, for example a new terminal
  window.

  This is the output during the crash in /var/log/Xorg.0.log
  [   253.500] (EE)
  [   253.500] (EE) Backtrace:
  [   253.500] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55f09075b62e]
  [   253.500] (EE) 1: /usr/bin/X (0x55f0905a7000+0x1b8999) [0x55f09075f999]
  [   253.500] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f44130a8000+0x352f0) [0x7f44130dd2f0]
  [   253.500] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x24f18) [0x7f440f4a3f18]
  [   253.500] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x26157) [0x7f440f4a5157]
  [   253.500] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x2b4b1) [0x7f440f4aa4b1]
  [   253.500] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x804e4) [0x7f440f4ff4e4]
  [   253.501] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x80e2c) [0x7f440f4ffe2c]
  [   253.501] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x82e1a) [0x7f440f501e1a]
  [   253.501] (EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x4197c) [0x7f440f4c097c]
  [   253.501] (EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f440f47f000+0x59906) [0x7f440f4d8906]
  [   253.501] (EE) 11: /usr/bin/X (_CallCallbacks+0x34) [0x55f090604654]
  [   253.501] (EE) 12: /usr/bin/X (WriteToClient+0x244) [0x55f09075f274]
  [   253.501] (EE) 13: /usr/bin/X (WriteEventsToClient+0x1e2) [0x55f09060a502]
  [   253.501] (EE) 14: /usr/bin/X (0x55f0905a7000+0xf495a) [0x55f09069b95a]
  [   253.501] (EE) 15: /usr/bin/X (0x55f0905a7000+0xf5ef5) [0x55f09069cef5]
  [   253.501] (EE) 16: /usr/bin/X (0x55f0905a7000+0x5818f) [0x55f0905ff18f]
  [   253.501] (EE) 17: /usr/bin/X (0x55f0905a7000+0x5c34b) [0x55f09060334b]
  [   253.501] (EE) 18: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f44130c8a40]
  [   253.501] (EE) 19: /usr/bin/X (_start+0x29) [0x55f0905ed6c9]
  [   253.501] (EE)
  [   253.501] (EE) Segmentation fault at address 0x0
  [   253.501] (EE)
  Fatal server error:
  [   253.501] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [   253.501] (EE)
  [   253.501] (EE)
  Please consult the The X.Org Foundation support
           at http://wiki.x.org 
   for help.
  [   253.501] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
  [   253.502] (EE)
  [   253.502] (II) AIGLX: Suspending AIGLX clients for VT switch
  [   253.588] (EE) Server terminated with error (1). Closing log file.

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