** Description changed:

- SSHing (with X11 forwarding enabled) from a Precise machine to an
- Oneiric machine and running certain X11 forwarded programs causes a
- crash of the program, either immediately or on the first mouse click on
- that program's window.
+ [Problem]
+ SSHing (with X11 forwarding enabled) from a Precise machine to an Oneiric 
machine and running certain X11 forwarded programs causes a crash of the 
program, either immediately or on the first mouse click on that program's 
window.
+ 
+ [Impact]
+ I have seen this on two client machines (a laptop and a desktop) running the 
latest precise release, connecting to either the oneiric desktop release or 
oneiric server release on the server side.  I have also reproduced this with 
two VirtualBox VMs, connected together with host-only networking and with 
desktop releases of Oneiric and Precise installed.
+ 
+ [Development Fix]
+ <fill me in with an explanation of how the bug has been addressed in the 
development branch, including the relevant version numbers of packages modified 
in order to implement the fix. >
+ 
+ [Stable Fix]
+ <fill me in by pointing out a minimal patch applicable to the stable version 
of the package.>
+ 
+ [Text Case]
+ - On client machine, install Precise with all updates as of 2012-03-29.
+ - On server machine, install Oneiric with all updates as of 2012-03-29.
+ - Set up host-only networking so that machines can ssh to each other.
+ - On client machine, "ssh -X" to the server machine.  Then run an X11 
application.  Some applications will crash immediately or on the first mouse 
click on that application.
+ 
+ On my test VirtualBox setup, applications that always crash on first click:
+ - gnome-terminal
+ - nautilus
+ - aisleriot solitaire
+ - gnome-control-center
+ - file-roller
+ - brasero
+ - gcalctool
+ - palimpsest
+ 
+ Applications that do not crash:
+ - Libre Office
+ - gimp
+ - banshee
+ - firefox
+ - thunderbird
+ 
+ Obviously, this isn't an exhaustive list.  When applications crash, they
+ spew out a large error message.  On my desktop machine, sshing in to an
+ Oneiric Server install on a physical machine, the programs crash
+ immediately without showing a window, but on my test setup with two
+ VirtualBox VMs, you first have to click on the window to cause it to
+ crash.  Sample crash output is attched to this bug report in the
+ crash_output.txt file.
+ 
+ 
+ [Regression Potential]
+ <fill me in with a discussion of likelihood and potential severity of 
regressions and how users could get inadvertently affected.>
+ 
+ [Original Report]
+ SSHing (with X11 forwarding enabled) from a Precise machine to an Oneiric 
machine and running certain X11 forwarded programs causes a crash of the 
program, either immediately or on the first mouse click on that program's 
window.
  
  I have seen this on two client machines (a laptop and a desktop) running
  the latest precise release, connecting to either the oneiric desktop
  release or oneiric server release on the server side.  I have also
  reproduced this with two VirtualBox VMs, connected together with host-
  only networking and with desktop releases of Oneiric and Precise
  installed.
  
  To reproduce:
  - On client machine, install Precise with all updates as of 2012-03-29.
  - On server machine, install Oneiric with all updates as of 2012-03-29.
  - Set up host-only networking so that machines can ssh to each other.
  - On client machine, "ssh -X" to the server machine.  Then run an X11 
application.  Some applications will crash immediately or on the first mouse 
click on that application.
  
  On my test VirtualBox setup, applications that always crash on first click:
  - gnome-terminal
  - nautilus
  - aisleriot solitaire
  - gnome-control-center
  - file-roller
  - brasero
  - gcalctool
  - palimpsest
  
  Applications that do not crash:
  - Libre Office
  - gimp
  - banshee
  - firefox
  - thunderbird
  
  Obviously, this isn't an exhaustive list.  When applications crash, they
  spew out a large error message.  On my desktop machine, sshing in to an
  Oneiric Server install on a physical machine, the programs crash
  immediately without showing a window, but on my test setup with two
  VirtualBox VMs, you first have to click on the window to cause it to
  crash.  Sample crash output is attched to this bug report in the
  crash_output.txt file.
  
  OS and Software Versions:
  
  Client:
  =====
  lsb_release -rd:
  Description:  Ubuntu precise (development branch)
  Release:      12.04
  
  apt-cache policy xorg:
  xorg:
    Installed: 1:7.6+12ubuntu1
    Candidate: 1:7.6+12ubuntu1
    Version table:
   *** 1:7.6+12ubuntu1 0
          500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
          100 /var/lib/dpkg/status
  
  Server:
  ======
  lsb_release -rd:
  Description:  Ubuntu 11.10
  Release:      11.10
  
  apt-cache policy xorg:
  xorg:
    Installed: 1:7.6+7ubuntu7.1
    Candidate: 1:7.6+7ubuntu7.1
    Version table:
   *** 1:7.6+7ubuntu7.1 0
          500 http://mirror.ox.ac.uk/sites/archive.ubuntu.com/ubuntu/ 
oneiric-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ oneiric-security/main amd64 
Packages
          100 /var/lib/dpkg/status
       1:7.6+7ubuntu7 0
          500 http://mirror.ox.ac.uk/sites/archive.ubuntu.com/ubuntu/ 
oneiric/main amd64 Packages
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+12ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  .tmp.unity.support.test.0:
  
  ApportVersion: 1.95-0ubuntu1
  Architecture: amd64
  CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Thu Mar 29 13:32:19 2012
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 4.1.10, 3.2.0-20-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64+mac 
(20120327.1)
  MachineType: Dell Inc. OptiPlex 960
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-20-generic 
root=UUID=587e726d-6c02-4c7f-aec3-843dbfd68f4c ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/31/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0F428D
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA05:bd07/31/2009:svnDellInc.:pnOptiPlex960:pvr:rvnDellInc.:rn0F428D:rvrA00:cvnDellInc.:ct3:cvr:
  dmi.product.name: OptiPlex 960
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.7.2-0ubuntu4
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

-- 
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which is subscribed to libxi in Ubuntu.
https://bugs.launchpad.net/bugs/968218

Title:
  ssh x11 forwarding precise to oneiric causes glibc malloc(): memory
  corruption

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