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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Trivially reproducible as per Bug Description without elevated permissions, across gtk based applications:
gnome-terminal: https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/1397502
gedit: https://bugs.launchpad.net/ubuntu/+source/gedit/+bug/1397503


** Package changed: gnome-terminal (Ubuntu) => gtk+3.0 (Ubuntu)

** Changed in: gtk+3.0 (Ubuntu)
   Importance: Undecided => High

** Changed in: gtk+3.0 (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/1395250

Title:
  XConvertSelection crashes any Gtk+ app

Status in GTK+ GUI Toolkit:
  Fix Released
Status in gtk+3.0 package in Ubuntu:
  Triaged

Bug description:
  1) lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  2) apt-cache policy gnome-terminal
  gnome-terminal:
    Installed: 3.6.2-0ubuntu1
    Candidate: 3.6.2-0ubuntu1
    Version table:
   *** 3.6.2-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  3) What is expected to happen is when one first installs the package libx11-dev , opens two terminal windows, highlights some text in one, and executes the following in the other, it does not crash:
  gcc -o run run.c -lX11 && ./run

  Where run.c is a file containing the following:
  #include <X11/Xlib.h>

  int main()
  {
    Display* dpy = XOpenDisplay(0);
    Atom selection = XInternAtom(dpy, "PRIMARY", False);
    Atom target = XInternAtom(dpy, "STRING", False);
    Window table = RootWindow(dpy, 0);
    XConvertSelection(dpy, selection, target, None, table, CurrentTime);
    XSync(dpy, 0);
    return 0;
  }

  4) What happens instead is it crashes consistently.
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: gnome-terminal 3.4.1.1-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-70.105-generic 3.2.63
  Uname: Linux 3.2.0-70-generic x86_64
  NonfreeKernelModules: blackmagic nvidia
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: amd64
  Date: Fri Nov 21 19:50:03 2014
  ExecutablePath: /usr/bin/gnome-terminal
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_US:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-terminal
  UpgradeStatus: No upgrade log present (probably fresh install)

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