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** Attachment added: "Stacktrace.txt"
   https://bugs.launchpad.net/bugs/1416081/+attachment/4308244/+files/Stacktrace.txt

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https://bugs.launchpad.net/bugs/1416081

Title:
  (FreeNX/X2Go) gnome-session crashed with SIGSEGV in
  gnome_idle_monitor_get_idletime()

Status in gnome-desktop3 package in Ubuntu:
  New

Bug description:
  The X server used by FreeNX and X2Go does not support the IDLETIME
  counter. This eventually leads to a NULL pointer dereference by gnome-
  session due to a missing parameter check in
  gnome_idle_monitor_get_idletime. This renders GNOME Flashback unusable
  via FreeNX/X2Go in Trusty.

  Utopic and newer are not affected and the patch is not applicable as
  the GnomeIdleMonitor implementation was rewritten. Saucy is also
  affected but is EOL, however I would like to fix this in Trusty as the
  patch is tiny and IMO obviously correct.

  This and bug #1251281 are the only bugs preventing GNOME Flashback
  being used via FreeNX/X2Go in Trusty; and the latter has an easy
  workaround (divert the acceleration-check helper and replace it with
  /bin/true) and may be fixed properly soon.

  I would be happy to prepare a debdiff and fill out the SRU template if
  a sponsor agrees that the patch is SRUable.

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: gnome-session-bin 3.9.90-0ubuntu12 [modified: usr/lib/gnome-session/gnome-session-check-accelerated usr/lib/gnome-session/gnome-session-check-accelerated-helper]
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  CasperVersion: 1.340
  Date: Thu Jan 29 19:28:42 2015
  ExecutablePath: /usr/bin/gnome-session
  ExecutableTimestamp: 1394758239
  LiveMediaBuild: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  ProcCmdline: /usr/bin/gnome-session --session=gnome-flashback
  ProcCwd: /home/ubuntu
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
   LD_LIBRARY_PATH=<set>
  SegvAnalysis:
   Segfault happened at: 0x7fb690b29196 <gnome_idle_monitor_get_idletime+6>:	mov    0x18(%rdi),%rax
   PC (0x7fb690b29196) ok
   source "0x18(%rdi)" (0x00000018) not located in a known VMA region (needed readable region)!
   destination "%rax" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: gnome-session
  StacktraceTop:
   gnome_idle_monitor_get_idletime (monitor=0x0) at gnome-idle-monitor.c:613
   reset_idle_watch (presence=0x7fb6780036f0) at gsm-presence.c:196
   gsm_presence_set_idle_enabled (presence=0x7fb6780036f0, enabled=1) at gsm-presence.c:354
   start_phase (manager=manager@entry=0x1658100) at gsm-manager.c:1568
   end_phase (manager=manager@entry=0x1658100) at gsm-manager.c:580
  Title: gnome-session crashed with SIGSEGV in gnome_idle_monitor_get_idletime()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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