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[Egmont Koblinger <egmont@xxxxxxxxx>]

Okay, there's indeed an OSC 112 (that is: \e ] 112 \a) in the output.

You could try installing the libvte-2.90-9 package from Utopic (and then
restart all gnome-terminal instances), I'm pretty certain this would fix
your problem. (I hope it doesn't have dependency problems.)

(I'm not giving this piece of advice on Ubuntu's behalf and it's not my
decision if they'll backport the fix to Trusty. I'm keeping an eye on
mainstream gnome-terminal/vte, where this bug is most likely alrady
fixed.)

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https://bugs.launchpad.net/bugs/1435905

Title:
  gnome-terminal randomly outputs control characters

Status in gnome-terminal package in Ubuntu:
  New

Bug description:
  Observed behavior:
  When using tmux, the terminal occasionally displays the "boxed" version of the 0x001b character followed by two ']' characters either in the cursor's current location or at the end of a refreshed line, or sometimes at an apparently random position on the screen. The times at which this character appears seem to be completely random.

  To reproduce:
  Get a clean install of tmux and gnome-terminal from the repositories. It is difficult to quantify this, but it appears that the bug will present itself most readily when working in vim or another refresh-heavy cli program.

  Why it's not a tmux bug:
  The bug appears to affect gnome-terminal and terminator, but not xterm or e.g. sessions connected over putty. In fact, if I open all of these screens side-by-size (using a virtual machine), and simultaneously attach to the same tmux session, only gnome-terminal and terminator show the strange characters, while the other two terminals render the screen as expected.

  Please see this superuser discussion for a link to a video of what the bug looks like:
  http://superuser.com/questions/864364/tmux-printing-u0x001b-and-112-randomly

  Let me know if there is anything else I can do to help reproduce/solve
  this, as using xterm is a really bad workaround to have to put up
  with.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: gnome-terminal 3.6.2-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  Date: Tue Mar 24 10:30:12 2015
  InstallationDate: Installed on 2015-01-11 (71 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-terminal
  UpgradeStatus: No upgrade log present (probably fresh install)

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