This bug was fixed in the package qtmir - 0.5.1+17.04.20170328-0ubuntu1

---------------
qtmir (0.5.1+17.04.20170328-0ubuntu1) zesty; urgency=medium

  [ Alan Griffiths ]
  * MirAL will be correcting another spelling error shortly. Avoid an
    FTBFS when that happens.
  * Compatibility with lp:mir and lp:~alan-griffiths/miral/1.3

  [ Albert Astals Cid ]
  * Remove empty property and move invokable
  * Run ApplicationManager::authorizeSession in the calling thread (LP:
    #1525285)

  [ Andreas Pokorny ]
  * Report and consume exception that may occur on constructing a keymap
    (LP: #1557634)

  [ Daniel d'Andrada ]
  * Ensure the window that got a key down also gets the corresponding
    key up (LP: #1671072)

  [ Gerry Boland ]
  * Don't let a child window go offscreen because its parent moved
  * Add env var equivalent to desktop_file_hint

  [ Lukáš Tinkl ]
  * Raise (activate) windows when an app focus is requested (LP:
    #1672337)

 -- Michał Sawicz <michal.saw...@canonical.com>  Tue, 28 Mar 2017
17:14:50 +0000

** Changed in: qtmir (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1557634

Title:
  Unity8/Mir server crashes when given an invalid keymap

Status in Canonical System Image:
  In Progress
Status in Mir:
  Confirmed
Status in mir package in Ubuntu:
  Confirmed
Status in qtmir package in Ubuntu:
  Fix Released

Bug description:
  https://errors.ubuntu.com/problem/4b8d65fc943d9604a00af4439b24bf85ddc6d1a7

  I foolishly tested unity8's keymap switching with the keymap "zh" (I
  should have used "cn").

  But I noticed that libmirclient crashed when I switched to "zh".
  While this isn't a supported use case, we shouldn't crash.

  Here's a non-debugful stack trace:

  #0  0xb61379a6 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6
  (gdb) bt
  #0  0xb61379a6 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6
  #1  0xb614562e in raise () from /lib/arm-linux-gnueabihf/libc.so.6
  #2  0xb6146332 in abort () from /lib/arm-linux-gnueabihf/libc.so.6
  #3  0xb6283120 in __gnu_cxx::__verbose_terminate_handler() ()
     from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
  #4  0xb6281950 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
  #5  0xb62819a6 in std::terminate() ()
     from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
  #6  0xb6281bc6 in __cxa_throw ()
     from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
  #7  0xb3d726ec in ?? () from /usr/lib/arm-linux-gnueabihf/libmirclient.so.9
  #8  0xb3d857f2 in 
mir::events::make_event(mir::IntWrapper<mir::frontend::detail::SessionsSurfaceIdTag,
 int> const&, long long, std::string const&, std::string const&, std::string 
const&, std::string const&) ()
     from /usr/lib/arm-linux-gnueabihf/libmirclient.so.9
  #9  0xb3e3e5e2 in ?? () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.38
  #10 0xb3e24d1e in ?? () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.38
  #11 0xb3e2aeb0 in ?? () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.38
  #12 0xb3e26870 in ?? () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.38
  #13 0xaa6476ce in qtmir::MirSurface::setKeymap(QString const&, QString const&)

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