ica crash with : caught signal: 11 on italc master connect

SRU justification:

[Impact]

 * iTALC is not meaningfully usable in trusty or utopic, because the client service crashes as soon as a master connects, which prevents the master interface from being used.

[Test Case]

 * Install italc-master and italc-client, answer "yes" to the questions about whether to set up groups. Add yourself to the italc-student and italc-teacher groups, and log out and in again so the memberships take effect.

 * In one terminal, run: ica

 * In another terminal, run: italc

Expected results: the master connects to the local client service

Actual results: the client service crashes when the master connects, preventing it from starting.

[Regression Potential]

 * The proposed fix imports a tiny patch written by upstream and included in iTALC 2.0.2.

 * The package is unusable at the moment, a regression could hardly make things worse!

[Other Info]

 * Packages for testing are in ppa:rtandy/lp1297345

Original description:

When trying to start italc (master) application after launching ica (client), ica crash with signal: 11.

Here the command-line output of ica :

mar. mars 25 15:56:37 2014: [INFO] Startup for user "admin" with arguments ("ica")
mar. mars 25 15:56:37 2014: [INFO] Ipc::Master: listening at port 37796
mar. mars 25 15:56:37 2014: [INFO] Starting slave "SystemTrayIcon" at port 37796
mar. mars 25 15:56:37 2014: [INFO] Exec
25/03/2014 15:56:37 passing arg to libvncserver: -rfbport
25/03/2014 15:56:37 passing arg to libvncserver: 11100
25/03/2014 15:56:37 x11vnc version: 0.9.13 lastmod: 2010-12-27 pid: 13384
25/03/2014 15:56:37 Using X display :0
25/03/2014 15:56:37 rootwin: 0x9d reswin: 0x3600001 dpy: 0x4400e750
25/03/2014 15:56:37
25/03/2014 15:56:37 ------------------ USEFUL INFORMATION ------------------
25/03/2014 15:56:37 X DAMAGE available on display, using it for polling hints.
25/03/2014 15:56:37 To disable this behavior use: '-noxdamage'
25/03/2014 15:56:37
25/03/2014 15:56:37 Most compositing window managers like 'compiz' or 'beryl'
25/03/2014 15:56:37 cause X DAMAGE to fail, and so you may not see any screen
25/03/2014 15:56:37 updates via VNC. Either disable 'compiz' (recommended) or
25/03/2014 15:56:37 supply the x11vnc '-noxdamage' command line option.
25/03/2014 15:56:37
25/03/2014 15:56:37 Wireframing: -wireframe mode is in effect for window moves.
25/03/2014 15:56:37 If this yields undesired behavior (poor response, painting
25/03/2014 15:56:37 errors, etc) it may be disabled:
25/03/2014 15:56:37 - use '-nowf' to disable wireframing completely.
25/03/2014 15:56:37 - use '-nowcr' to disable the Copy Rectangle after the
25/03/2014 15:56:37 moved window is released in the new position.
25/03/2014 15:56:37 Also see the -help entry for tuning parameters.
25/03/2014 15:56:37 You can press 3 Alt_L's (Left "Alt" key) in a row to
25/03/2014 15:56:37 repaint the screen, also see the -fixscreen option for
25/03/2014 15:56:37 periodic repaints.
25/03/2014 15:56:37
25/03/2014 15:56:37 XFIXES available on display, resetting cursor mode
25/03/2014 15:56:37 to: '-cursor most'.
25/03/2014 15:56:37 to disable this behavior use: '-cursor arrow'
25/03/2014 15:56:37 or '-noxfixes'.
25/03/2014 15:56:37 using XFIXES for cursor drawing.
25/03/2014 15:56:37 GrabServer control via XTEST.
25/03/2014 15:56:37
25/03/2014 15:56:37 Scroll Detection: -scrollcopyrect mode is in effect to
25/03/2014 15:56:37 use RECORD extension to try to detect scrolling windows
25/03/2014 15:56:37 (induced by either user keystroke or mouse input).
25/03/2014 15:56:37 If this yields undesired behavior (poor response, painting
25/03/2014 15:56:37 errors, etc) it may be disabled via: '-noscr'
25/03/2014 15:56:37 Also see the -help entry for tuning parameters.
25/03/2014 15:56:37 You can press 3 Alt_L's (Left "Alt" key) in a row to
25/03/2014 15:56:37 repaint the screen, also see the -fixscreen option for
25/03/2014 15:56:37 periodic repaints.
25/03/2014 15:56:37 X FBPM extension not supported.
25/03/2014 15:56:37 X display is capable of DPMS.
25/03/2014 15:56:37 --------------------------------------------------------
25/03/2014 15:56:37
25/03/2014 15:56:37 Default visual ID: 0x20
25/03/2014 15:56:37 Read initial data from X display into framebuffer.
25/03/2014 15:56:37 initialize_screen: fb_depth/fb_bpp/fb_Bpl 24/32/7680
25/03/2014 15:56:37
25/03/2014 15:56:37 X display :0 is 32bpp depth=24 true color
25/03/2014 15:56:37
25/03/2014 15:56:37 Listening for VNC connections on TCP port 11100
25/03/2014 15:56:37 Listening also on IPv6 port 11100 (socket 21)
25/03/2014 15:56:37 Xinerama: Library libXinerama is not available to determine
25/03/2014 15:56:37 Xinerama: the head geometries, consider using -blackout
25/03/2014 15:56:37 Xinerama: if the screen is non-rectangular.
25/03/2014 15:56:37 fb read rate: 1387 MB/sec
25/03/2014 15:56:37 fast read: reset -wait ms to: 10
25/03/2014 15:56:37 fast read: reset -defer ms to: 10
25/03/2014 15:56:37 The X server says there are 16 mouse buttons.
25/03/2014 15:56:37 screen setup finished.
25/03/2014 15:56:37

The VNC desktop is: ba024-xx:5200
25/03/2014 15:56:37 possible aliases: ba024-xx:11100, ba024-xx::11100
PORT=11100

******************************************************************************
Have you tried the x11vnc '-ncache' VNC client-side pixel caching feature yet?

The scheme stores pixel data offscreen on the VNC viewer side for faster
retrieval. It should work with any VNC viewer. Try it by running:

    x11vnc -ncache 10 ...

One can also add -ncache_cr for smooth 'copyrect' window motion.
More info: http://www.karlrunge.com/x11vnc/faq.html#faq-client-caching

25/03/2014 15:57:34 Got connection from client 127.0.0.1
25/03/2014 15:57:34 other clients:
caught signal: 11
25/03/2014 15:57:34 deleted 60 tile_row polling images.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: italc-client 1:2.0.1-4
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Mar 25 15:59:53 2014
InstallationDate: Installed on 2014-03-24 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140323)
SourcePackage: italc
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.xdg.iTALC: [deleted]