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** Attachment added: "Stacktrace.txt"
   https://bugs.launchpad.net/bugs/1391710/+attachment/4258795/+files/Stacktrace.txt

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https://bugs.launchpad.net/bugs/1391710

Title:
  Xorg assert failure: *** Error in `/usr/bin/X': malloc(): smallbin
  double linked list corrupted: 0xb83bc370 ***

Status in “xorg-server” package in Ubuntu:
  New

Bug description:
  After upgrading to Utopic, xorg randomly crashes with machine unattended.
  After the xorg crash, I am unable to access any terminals, the only way to gracefully shut down the computer is via ssh.
  No particular pattern to this, I have tried various screensavers including non-GL ones, also disabling power management to no avail.

  The crashes can occur within 30 minutes of bootup, or might not happen
  for over 12 hours.

  ProblemType: Crash
  DistroRelease: Ubuntu 14.10
  Package: xserver-xorg-core 2:1.16.0-1ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic i686
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: i386
  AssertionMessage: *** Error in `/usr/bin/X': malloc(): smallbin double linked list corrupted: 0xb83bc370 ***
  Date: Tue Nov 11 16:32:58 2014
  ExecutablePath: /usr/bin/Xorg
  ExecutableTimestamp: 1410354773
  InstallationDate: Installed on 2011-10-21 (1117 days ago)
  InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011)
  ProcCmdline: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
  ProcCwd: /etc/X11
  ProcEnviron:
   
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0xb720d79c "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
   malloc_printerr (action=<optimized out>, str=0xb720db20 "malloc(): smallbin double linked list corrupted", ptr=0xb83bc370) at malloc.c:4996
   _int_malloc (av=av@entry=0xb7252420 <main_arena>, bytes=bytes@entry=68) at malloc.c:3359
   __libc_calloc (n=1, elem_size=68) at malloc.c:3219
   ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
  Title: Xorg assert failure: *** Error in `/usr/bin/X': malloc(): smallbin double linked list corrupted: 0xb83bc370 ***
  UpgradeStatus: Upgraded to utopic on 2014-11-08 (3 days ago)
  UserGroups:

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