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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

Bisected. The problem originated in:

------------------------------------------------------------
revno: 3098 [merge]
author: Cemil Azizoglu <cemil.azizoglu@xxxxxxxxxxxxx>
committer: Tarmac
branch nick: development-branch
timestamp: Tue 2015-11-10 23:10:22 +0000
message:
  Tighten probing rules. Fixes: https://bugs.launchpad.net/bugs/1506707.
  
  Approved by PS Jenkins bot, Andreas Pokorny, Alan Griffiths, Alexandros Frantzis.
------------------------------------------------------------

which coincidentally is also the source of another regression bug
1526225.

** Changed in: mesa (Ubuntu)
       Status: New => Invalid

** Changed in: mir
       Status: New => Triaged

** Changed in: mir/0.18
       Status: New => Triaged

** Changed in: mir (Ubuntu)
       Status: Incomplete => Triaged

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https://bugs.launchpad.net/bugs/1526209

Title:
  [regression] Clients of nested Mir servers silently crash/exit
  instantly

Status in Mir:
  Triaged
Status in Mir 0.18 series:
  Triaged
Status in mesa package in Ubuntu:
  Invalid
Status in mir package in Ubuntu:
  Triaged

Bug description:
  Clients of nested Mir servers silently crash/exit instantly (on
  xenial)

  This happens in Mir trunk lp:mir and lp:mir/0.18, but not in
  lp:mir/0.17

    sudo bin/mir_demo_server_minimal -f /tmp/outside &
    sudo bin/mir_proving_server -f /tmp/inside --host-socket=/tmp/outside &
    sudo bin/mir_demo_client_egltriangle -m /tmp/inside

  And the client silently exits with return code 139.

  Valgrind or gdb show the problem though:

  ==16515== Process terminating with default action of signal 11 (SIGSEGV)
  ==16515==  Access not within mapped region at address 0x123460A8
  ==16515==    at 0x6EA16E0: XGetXCBConnection (in /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1.0.0)
  ==16515==    by 0x517AC73: ??? (in /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1.0.0)
  ==16515==    by 0x5174ADE: ??? (in /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1.0.0)
  ==16515==    by 0x5174B98: ??? (in /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1.0.0)
  ==16515==    by 0x5170B31: eglInitialize (in /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1.0.0)
  ==16515==    by 0x4031A9: mir_eglapp_init (eglapp.c:350)
  ==16515==    by 0x4024EC: main (egltriangle.c:85)

  #0  0x00007ffff5b6e6e0 in XGetXCBConnection ()
     from /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1
  #1  0x00007ffff7893c74 in ?? ()
     from /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
  #2  0x00007ffff788dadf in ?? ()
     from /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
  #3  0x00007ffff788db99 in ?? ()
     from /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
  #4  0x00007ffff7889b32 in eglInitialize ()
     from /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
  #5  0x00000000004031aa in mir_eglapp_init (argc=3, argv=0x7fffffffe548,
      width=0x7fffffffdd48, height=0x7fffffffdd4c)
      at /home/dan/bzr/mir/0.18/examples/eglapp.c:350
  #6  0x00000000004024ed in main (argc=3, argv=0x7fffffffe548)
      at /home/dan/bzr/mir/0.18/examples/egltriangle.c:85

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