unity-system-compositor crashed with SIGSEGV in invoke() from mir::frontend::detail::ProtobufMessageProcessor::dispatch:on_new_message() from on_read_size()

This problem appears to be exlcusively in the Mir libraries and not in U-S-C.

Looking at src/server/frontend/protobuf_message_processor.cpp LL105..154

This looks like an issue with the "response_callback" supplied to SelfDeletingCallback throwing: in which case the "callback" has self destructed before the catch block is entered.

Fix committed into lp:mir at revision None, scheduled for release in mir, milestone 1.0.0

This bug was fixed in the package mir - 0.28.0+17.10.20171011.1-0ubuntu1

---------------
mir (0.28.0+17.10.20171011.1-0ubuntu1) artful; urgency=medium

  * New upstream release 0.28.0(https://launchpad.net/mir/+milestone/0.28.0)
    - ABI summary:
      . mirclient ABI unchanged at 9
      . miral ABI introduced at 2
      . mirserver ABI bumped to 45
      . mircommon ABI unchanged at 7
      . mirplatform ABI unchanged at 61
      . mirprotobuf ABI unchanged at 3
      . mirplatformgraphics ABI unchanged at 13
      . mirclientplatform ABI unchanged at 5
      . mirinputplatform ABI unchanged at 7
      . mircore ABI unchanged at 1
    - Enhancements:
      . Update licences to (L)GPL3 or (L)GPL2.
      . Initial support for Wayland clients
      . [mir_demo_client_display_config] add orientation changing
      . RPC: Don't require the server ACK client's buffer-release requests.
      . Added libmirclientcpp to Mir source package
      . Added libmiral to Mir source package
      . Various small improvements to miral-shell example
      . [libmiral, miral-shell] handle display reconfiguration better and allow
        shells to customize maximized placements.
      . Enable CommandLineOptions to be processed before server initialization
    - Bugs fixed:
      . Fix handling of invalid display configuration. (LP: #1643446)
      . Move full responsibility for buffer IPC into frontend. (LP: #1395421)
      . Don't destroy an IPC "closure" object when it may yet be used
        (LP: #1672960)
      . [mesa-kms] Respect display orientation when painting cursor.
        (LP: #1610078)
      . Respect cursor hotspot when hosted on Mir. (LP: #1705284)
      . mcl::BufferVault: Fix lock inversion.
      . Handle mir_event_type_close_window in examples (LP: #1706004),
        (LP: #1705439)
      . Drop BufferStream::suitable_for_cursor()
      . Only notify resize events for valid surfaces (LP: #1643446)
      . Don't leak DRM fds in platform-eglstream probe.
      . Remove obsolete & broken example code. (LP: #1663130)
      . Move buffer-release IPC to a dedicated IPC thread. (LP: #1395421)
      . [NestedServerWithTwoDisplays] Look for the last of a series of
        synthetic events to ensure that the queue is drained before the test
        exits. (LP: #1709666)
      . floating window manager allows resizing maximized windows (LP: #1704776)
      . [miral-shell] doesn't work with breeze X cursor theme (LP: #1699084)
      . [miral-shell] Don't allow splashscreen to be occluded (LP: #1705973)
      . [miral-shell] Update maximized windows on display changes (LP: #1705695)
      . Make racy DragAndDrop test reliable. (LP: #1704780)
      . [libmiral] Define default window settings in one place and clamp the
        actual values to avoid ldiv0. (LP: #1717061)
      . [miral-kiosk] Apply fullscreen logic when hidden windows are restored.
        (LP: #1717910)
      . [mir-on-x11] Less annoying clipping of Mir-on-X11 window when it exceeds
        display bounds. (LP: #1668599)

 -- Alan Griffiths <email address hidden> Wed, 11 Oct 2017 15:06:23 +0000