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[Niklas Wenzel <nikwen.developer@xxxxxxxxx>]

@saviq: Thank you for linking the Mir bug as I'm also seeing this.

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https://bugs.launchpad.net/bugs/1405687

Title:
  unity8 crashes while using webbrowser-app

Status in unity8 package in Ubuntu:
  Incomplete

Bug description:
  This happens often, maybe one every ten minutes while browsing
  (m.reddit.com, en.wikipedia.org, bt.no, stackexchange.com, etc).

  1) The release of Ubuntu you are using, via 'lsb_release -rd' or
  System -> About Ubuntu

  Distributor ID:	Ubuntu
  Description:	Ubuntu Vivid Vervet (development branch)
  Release:	15.04 (r58)
  Codename:	vivid

  2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
  unity8:
    Installed: 8.02+15.04.20141216.1-0ubuntu1
    Candidate: 8.02+15.04.20141216.1-0ubuntu1
    Version table:
   *** 8.02+15.04.20141216.1-0ubuntu1 0
          500 http://ports.ubuntu.com/ubuntu-ports/ vivid/universe armhf Packages
          100 /var/lib/dpkg/status

  3) What you expected to happen
  Unity8/mir should not crash

  4) What happened instead
  Something crashed, got spinning Ubuntu logo

  Excerpt from unity8 log from before, during and after the crash, while
  browsing the web normally (one tab, wikipedia):

  qtmir.applications: Application::setSession - appId= "webbrowser-app" session= QObject(0x0)
  qtmir.sessions: Session::setSurface - session= "QtUbuntu" surface= QQuickItem(0)
  qtmir.surfaces: MirSurfaceItem::~MirSurfaceItem - this= qtmir::MirSurfaceItem (this = 0x18f1240 , name= "" , parent = 0x1804438 , geometry = QRectF(0,0 768x1222) , z = 1 )
  qtmir.sessions: SessionManager::onSessionStopping - sessionName= QtUbuntu
  qtmir.mir: SessionListener::destroying_surface - this= SessionListener(0xb04667d4) session= 0xad5068dc surface= 0xad507568
  qtmir.surfaces: MirSurfaceManager::onSessionDestroyingSurface - session= 0xad5068dc surface= 0xad507568 surface.name= Ubuntu Web Browser
  MirSurfaceManager::onSessionDestroyingSurface: unable to find MirSurfaceItem corresponding to surface= 0xad507568 surface.name= Ubuntu Web Browser
  Signal caught by Mir, stopping Mir server..
  qtmir.applications: ApplicationManager::onSessionStopping - sessionName= pay-service
  qtmir.sessions: SessionManager::onSessionStopping - sessionName= pay-service
  qtmir.applications: ApplicationManager::onSessionStopping - sessionName= UbuntuLocationService
  qtmir.sessions: SessionManager::onSessionStopping - sessionName= UbuntuLocationService
  Caught exception at Mir/EGL driver boundary: /build/buildd/mir-0.9.0+15.04.20141125/src/client/rpc/stream_socket_transport.cpp(166): Throw in function virtual void mir::client::rpc::StreamSocketTransport::send_message(const std::vector<unsigned char>&, const std::vector<mir::Fd>&)
  Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorIN3mir25socket_disconnected_errorEEEEE
  std::exception::what: Failed to send message to server: Broken pipe
  32, "Broken pipe"
  qtmir.mir: SessionListener::stopping - this= SessionListener(0xb04667d4) session= 0xad5035fc
  qtmir.mir: SessionListener::unfocused - this= SessionListener(0xb04667d4)
  g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
  [1419545181.094743] (II) UnknownComponent: Stopping Mir Server
  Signal caught by Mir, stopping Mir server..
  QtCompositor::setAllWindowsExposed false
  qtmir.surfaces: MirSurfaceItem::release - this= qtmir::MirSurfaceItem (this = 0x16c6c50 , name= "" , parent = 0x0 , geometry = QRectF(0,0 768x1222) , z = 0 )
  qtmir.sessions: Session::setSurface - session= "QtUbuntu" surface= QQuickItem(0)
  QThread: Destroyed while thread is still running

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion
  'value->ref_count > 0' failed

  (process:31750): GLib-CRITICAL **: g_variant_unref: assertion 'value->ref_count > 0' failed
  qtmir.surfaces: MirSurfaceItem::~MirSurfaceItem - this= qtmir::MirSurfaceItem (this = 0x16c6c50 , name= "" , parent = 0x0 , geometry = QRectF(0,0 768x1222) , z = 0 )
  qtmir.applications: ApplicationManager::~ApplicationManager
  qtmir.sessions: SessionManager::~SessionManager - this= qtmir::SessionManager(0x12ec678, name = "qtmir::SessionManager")
  qtmir.surfaces: MirSurfaceManager::~MirSurfaceManager - this= qtmir::MirSurfaceManager(0x12ecf30, name = "qtmir::SurfaceManager")
  Attempted to unregister path (path[0] = core path[1] = ubuntu) which isn't registered
  process 31750: arguments to dbus_connection_close() were incorrect, assertion "connection->generation == _dbus_current_generation" failed in file ../../dbus/dbus-connection.c line 2935.
  This is normally a bug in some application using the D-Bus library.
  process 31750: arguments to dbus_connection_unref() were incorrect, assertion "connection->generation == _dbus_current_generation" failed in file ../../dbus/dbus-connection.c line 2822.
  This is normally a bug in some application using the D-Bus library.
  process 31750: arguments to dbus_message_unref() were incorrect, assertion "message->generation == _dbus_current_generation" failed in file ../../dbus/dbus-message.c line 1695.
  This is normally a bug in some application using the D-Bus library.
  process 31750: arguments to dbus_connection_unref() were incorrect, assertion "connection->generation == _dbus_current_generation" failed in file ../../dbus/dbus-connection.c line 2822.
  This is normally a bug in some application using the D-Bus library.
  process 31750: arguments to dbus_message_unref() were incorrect, assertion "message->generation == _dbus_current_generation" failed in file ../../dbus/dbus-message.c line 1695.
  This is normally a bug in some application using the D-Bus library.
  process 31750: arguments to dbus_connection_unref() were incorrect, assertion "connection->generation == _dbus_current_generation" failed in file ../../dbus/dbus-connection.c line 2822.
  This is normally a bug in some application using the D-Bus library.
  ()
  [1419545193.991218] (II) UnknownComponent: Loading library : libmirplatform4driver.so
  qtmir.mir: MirServer created
  [1419545194.035076] (II) UnknownComponent: Starting Mir server

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: unity8 8.02+15.04.20141216.1-0ubuntu1
  Uname: Linux 3.4.0-5-mako armv7l
  ApportVersion: 2.15-0ubuntu3
  Architecture: armhf
  Date: Thu Dec 25 23:10:07 2014
  InstallationDate: Installed on 2014-12-18 (7 days ago)
  InstallationMedia: Ubuntu Vivid Vervet (development branch) - armhf (20141218-020204)
  SourcePackage: unity8
  UpgradeStatus: No upgrade log present (probably fresh install)
  upstart.unity8.log: qtmir.sensor: Screen::toggleSensors - enable= false

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