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[Tino Didriksen <mail@xxxxxxxxxxxxxxxxx>]

Public bug reported:

Ubuntu 14.04 LTS with xserver-xorg-lts-utopic and linux-generic-lts-
utopic installed to even make touchpad work. The system can run for days
without any problems, but sooner or later a spontaneous segfault will
happen and return to the login screen.

xserver-xorg-lts-utopic 1:7.7+7ubuntu2~trusty1
xserver-xorg-input-synaptics-lts-utopic 1.8.1-1ubuntu1~trusty1


Xorg launch log: http://codepad.org/COKiZYof
X.Org X Server 1.16.0
Release Date: 2014-07-16
[226151.797] Current Operating System: Linux nitro 3.16.0-34-generic #45~14.04.1-Ubuntu SMP Tue Mar 24 11:14:29 UTC 2015 x86_64
[226151.797] Kernel command line: BOOT_IMAGE=/vmlinuz-3.16.0-34-generic.efi.signed root=UUID=0046f2da-0cf6-40a5-bb01-dbda4a8371cb ro rootflags=subvol=@ resume=UUID=d48c1651-fdab-41de-895c-0d5b9e50a1f9
[226151.797] Build Date: 12 February 2015  11:11:26PM
[226151.797] xorg-server 2:1.16.0-1ubuntu1.2~trusty2


Xorg segfault log: http://codepad.org/n1EcjwJY
[226115.806] (EE) Backtrace:
[226115.809] (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7f85b9765ed8]
[226115.810] (EE) 1: /usr/bin/X (0x7f85b95c1000+0x1a8f19) [0x7f85b9769f19]
[226115.810] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f85b7741000+0x36d40) [0x7f85b7777d40]
[226115.810] (EE) 3: /usr/bin/X (0x7f85b95c1000+0x7a880) [0x7f85b963b880]
[226115.810] (EE) 4: /usr/bin/X (0x7f85b95c1000+0x7a8da) [0x7f85b963b8da]
[226115.810] (EE) 5: /usr/bin/X (0x7f85b95c1000+0x136e49) [0x7f85b96f7e49]
[226115.810] (EE) 6: /usr/bin/X (0x7f85b95c1000+0x15efc9) [0x7f85b971ffc9]
[226115.810] (EE) 7: /usr/bin/X (mieqProcessDeviceEvent+0x199) [0x7f85b97480e9]
[226115.812] (EE) 8: /usr/bin/X (mieqProcessInputEvents+0xf7) [0x7f85b9748227]
[226115.813] (EE) 9: /usr/bin/X (ProcessInputEvents+0x9) [0x7f85b9651d09]
[226115.813] (EE) 10: /usr/bin/X (0x7f85b95c1000+0x533e2) [0x7f85b96143e2]
[226115.813] (EE) 11: /usr/bin/X (0x7f85b95c1000+0x574ea) [0x7f85b96184ea]
[226115.813] (EE) 12: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f85b7762ec5]
[226115.813] (EE) 13: /usr/bin/X (0x7f85b95c1000+0x42a5e) [0x7f85b9603a5e]
[226115.813] (EE)
[226115.848] (EE) Segmentation fault at address 0x7f850000000a


Xorg's log also gets filled up with these messages http://codepad.org/dLKc2JJo which makes me suspect Synaptics is to blame for the eventual segfault:
(EE) BUG: triggered 'if (priv->num_active_touches > priv->num_slots)'
(EE) BUG: ../../src/synaptics.c:2991 in UpdateTouchState()

** Affects: xserver-xorg-input-synaptics (Ubuntu)
     Importance: Undecided
         Status: New

-- 
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Packages, which is subscribed to xserver-xorg-input-synaptics in Ubuntu.
https://bugs.launchpad.net/bugs/1443485

Title:
  xserver-xorg crash, probably synaptics

Status in xserver-xorg-input-synaptics package in Ubuntu:
  New

Bug description:
  Ubuntu 14.04 LTS with xserver-xorg-lts-utopic and linux-generic-lts-
  utopic installed to even make touchpad work. The system can run for
  days without any problems, but sooner or later a spontaneous segfault
  will happen and return to the login screen.

  xserver-xorg-lts-utopic 1:7.7+7ubuntu2~trusty1
  xserver-xorg-input-synaptics-lts-utopic 1.8.1-1ubuntu1~trusty1

  
  Xorg launch log: http://codepad.org/COKiZYof
  X.Org X Server 1.16.0
  Release Date: 2014-07-16
  [226151.797] Current Operating System: Linux nitro 3.16.0-34-generic #45~14.04.1-Ubuntu SMP Tue Mar 24 11:14:29 UTC 2015 x86_64
  [226151.797] Kernel command line: BOOT_IMAGE=/vmlinuz-3.16.0-34-generic.efi.signed root=UUID=0046f2da-0cf6-40a5-bb01-dbda4a8371cb ro rootflags=subvol=@ resume=UUID=d48c1651-fdab-41de-895c-0d5b9e50a1f9
  [226151.797] Build Date: 12 February 2015  11:11:26PM
  [226151.797] xorg-server 2:1.16.0-1ubuntu1.2~trusty2

  
  Xorg segfault log: http://codepad.org/n1EcjwJY
  [226115.806] (EE) Backtrace:
  [226115.809] (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7f85b9765ed8]
  [226115.810] (EE) 1: /usr/bin/X (0x7f85b95c1000+0x1a8f19) [0x7f85b9769f19]
  [226115.810] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f85b7741000+0x36d40) [0x7f85b7777d40]
  [226115.810] (EE) 3: /usr/bin/X (0x7f85b95c1000+0x7a880) [0x7f85b963b880]
  [226115.810] (EE) 4: /usr/bin/X (0x7f85b95c1000+0x7a8da) [0x7f85b963b8da]
  [226115.810] (EE) 5: /usr/bin/X (0x7f85b95c1000+0x136e49) [0x7f85b96f7e49]
  [226115.810] (EE) 6: /usr/bin/X (0x7f85b95c1000+0x15efc9) [0x7f85b971ffc9]
  [226115.810] (EE) 7: /usr/bin/X (mieqProcessDeviceEvent+0x199) [0x7f85b97480e9]
  [226115.812] (EE) 8: /usr/bin/X (mieqProcessInputEvents+0xf7) [0x7f85b9748227]
  [226115.813] (EE) 9: /usr/bin/X (ProcessInputEvents+0x9) [0x7f85b9651d09]
  [226115.813] (EE) 10: /usr/bin/X (0x7f85b95c1000+0x533e2) [0x7f85b96143e2]
  [226115.813] (EE) 11: /usr/bin/X (0x7f85b95c1000+0x574ea) [0x7f85b96184ea]
  [226115.813] (EE) 12: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f85b7762ec5]
  [226115.813] (EE) 13: /usr/bin/X (0x7f85b95c1000+0x42a5e) [0x7f85b9603a5e]
  [226115.813] (EE)
  [226115.848] (EE) Segmentation fault at address 0x7f850000000a

  
  Xorg's log also gets filled up with these messages http://codepad.org/dLKc2JJo which makes me suspect Synaptics is to blame for the eventual segfault:
  (EE) BUG: triggered 'if (priv->num_active_touches > priv->num_slots)'
  (EE) BUG: ../../src/synaptics.c:2991 in UpdateTouchState()

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