unity8 crashes while using webbrowser-app

[Jonas G. Drange]

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

[Michał Sawicz (saviq)]

Difficult to say without a stack trace, but I expect this to be bug #1401488, one thing to notice is whether you get a .crash file for unity-system-compositor in /var/crash.

[Jonas G. Drange (jonas-drange)]

@saviq, that could be what I'm seeing. I've been using webbrowser-app the most, so crashes could still be random.

[Niklas Wenzel (nikwen)]

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

[Launchpad Janitor (janitor)]

[Expired for unity8 (Ubuntu) because there has been no activity for 60 days.]