#0  0x00007f5639ea8f79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 14781
        selftid = 14781
#1  0x00007f5639eac388 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7fff838088a9, sa_sigaction = 0x7fff838088a9}, sa_mask = {__val = {140008316926982, 140008234234331, 736, 4294967295, 140008315565971, 0, 140735399614944, 47268578288, 140735399614864, 140735399626966, 0, 0, 0, 21474836480, 140007478456320, 140008352280554}}, sa_flags = 890320424, sa_restorer = 0x7f5635113650 <__PRETTY_FUNCTION__.14502>}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f5639ea1e36 in __assert_fail_base (fmt=0x7f563c1a6fea <error: Cannot access memory at address 0x7f563c1a6fea>, assertion=assertion@entry=0x7f5635113628 "!xcb_xlib_too_much_data_requested", file=file@entry=0x7f56351131db "../../src/xcb_io.c", line=line@entry=736, function=function@entry=0x7f5635113650 <__PRETTY_FUNCTION__.14502> "_XRead") at assert.c:92
        str = 0x1c6a780 ""
        total = 4096
#3  0x00007f5639ea1ee2 in __GI___assert_fail (assertion=assertion@entry=0x7f5635113628 "!xcb_xlib_too_much_data_requested", file=file@entry=0x7f56351131db "../../src/xcb_io.c", line=line@entry=736, function=function@entry=0x7f5635113650 <__PRETTY_FUNCTION__.14502> "_XRead") at assert.c:101
No locals.
#4  0x00007f56350a4925 in _XRead (dpy=0x16d30a0, data=<optimized out>, size=<optimized out>) at ../../src/xcb_io.c:735
        xcb_xlib_too_much_data_requested = 1
        __PRETTY_FUNCTION__ = "_XRead"
#5  0x00007f563986df5e in ?? () from /tmp/apport_sandbox_k7c21J/usr/lib/nvidia-331/libGL.so.1
No symbol table info available.
#6  0x00007f563b108db6 in (anonymous namespace)::Resolver<QOpenGLFunctionsPrivate, void (*)(int, unsigned int*), 3, void>::operator()<int, unsigned int*> (this=this@entry=0x7fff83805c20, p1=p1@entry=1, p2=p2@entry=0x1cf08b0) at opengl/qopenglfunctions.cpp:1766
        context = 0x210d900
        funcs = 0x1ccbc80
        old = 0x7f563b1091a0 <qopenglfResolveGenBuffers(GLsizei, GLuint*)>
#7  0x00007f563b1091f2 in qopenglfResolveGenBuffers (n=1, buffers=0x1cf08b0) at opengl/qopenglfunctions.cpp:2009
No locals.
#8  0x00007f563bb5e534 in glGenBuffers (buffers=0x1cf08b0, n=1, this=0x1ca6270) at /usr/include/qt5/QtGui/qopenglfunctions.h:763
No locals.
#9  QSGBatchRenderer::Renderer::unmap (this=0x1ca6260, buffer=0x1cf08b0) at scenegraph/coreapi/qsgbatchrenderer.cpp:884
No locals.
#10 0x00007f563bb66639 in QSGBatchRenderer::Renderer::uploadBatch (this=this@entry=0x1ca6260, b=0x1cf0890) at scenegraph/coreapi/qsgbatchrenderer.cpp:1861
        __PRETTY_FUNCTION__ = "void QSGBatchRenderer::Renderer::uploadBatch(QSGBatchRenderer::Batch*)"
        canMerge = <optimized out>
        e = <optimized out>
        gn = <optimized out>
        unmergedIndexSize = <optimized out>
        bufferSize = <optimized out>
#11 0x00007f563bb6a872 in QSGBatchRenderer::Renderer::render (this=0x1ca6260) at scenegraph/coreapi/qsgbatchrenderer.cpp:2347
        i = 0
        __PRETTY_FUNCTION__ = "virtual void QSGBatchRenderer::Renderer::render()"
#12 0x00007f563bb73d23 in QSGRenderer::renderScene (this=this@entry=0x1ca6260, bindable=...) at scenegraph/coreapi/qsgrenderer.cpp:259
        profileFrames = <optimized out>
        bindTime = 0
        renderTime = 0
        __PRETTY_FUNCTION__ = "void QSGRenderer::renderScene(const QSGBindable&)"
#13 0x00007f563bb74007 in QSGRenderer::renderScene (this=this@entry=0x1ca6260) at scenegraph/coreapi/qsgrenderer.cpp:218
        b = warning: RTTI symbol not found for class 'QSGRenderer::renderScene()::B'
{<QSGBindable> = {_vptr.QSGBindable = 0x7f563bfb6210 <vtable for QSGRenderer::renderScene()::B+16>}, <No data fields>}
#14 0x00007f563bb819c0 in QSGRenderContext::renderNextFrame (this=0x17f5b10, renderer=0x1ca6260, fboId=<optimized out>) at scenegraph/qsgcontext.cpp:363
No locals.
#15 0x00007f563bbba206 in QQuickWindowPrivate::renderSceneGraph (this=this@entry=0x17f4630, size=...) at items/qquickwindow.cpp:365
        _qml_memory_scope = {pushed = false}
        fboId = <optimized out>
        devicePixelRatio = <optimized out>
#16 0x00007f563bb9b572 in QSGGuiThreadRenderLoop::renderWindow (this=this@entry=0x17f5060, window=0x17b3170) at scenegraph/qsgrenderloop.cpp:315
        __PRETTY_FUNCTION__ = "void QSGGuiThreadRenderLoop::renderWindow(QQuickWindow*)"
        alsoSwap = true
        renderTime = 0
        profileFrames = false
        swapTime = <optimized out>
        current = <optimized out>
        syncTime = 0
        renderTimer = {t1 = 31268480, t2 = 140007343915008}
#17 0x00007f563bb9babe in QSGGuiThreadRenderLoop::exposureChanged (this=0x17f5060, window=0x17b3170) at scenegraph/qsgrenderloop.cpp:362
No locals.
#18 0x00007f563aedfa29 in QWindow::event (this=this@entry=0x17b3170, ev=ev@entry=0x7fff83806220) at kernel/qwindow.cpp:1921
No locals.
#19 0x00007f563bbc3553 in QQuickWindow::event (this=0x17b3170, e=0x7fff83806220) at items/qquickwindow.cpp:1292
No locals.
#20 0x00007f563a9b9efd in QCoreApplication::notify (this=<optimized out>, receiver=<optimized out>, event=<optimized out>) at kernel/qcoreapplication.cpp:943
        d = <optimized out>
#21 0x00007f563a9b9c2d in QCoreApplication::notifyInternal (this=0x7fff83806530, receiver=receiver@entry=0x17b3170, event=event@entry=0x7fff83806220) at kernel/qcoreapplication.cpp:881
        threadData = 0x16b38d0
        loopLevelCounter = {threadData = 0x16b38d0}
        result = false
        cbdata = {0x17b3170, 0x7fff83806220, 0x7fff838061af}
        d = <optimized out>
#22 0x00007f563aed9ea6 in sendSpontaneousEvent (event=0x7fff83806220, receiver=0x17b3170) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:235
No locals.
#23 QGuiApplicationPrivate::processExposeEvent (e=0x1f14210) at kernel/qguiapplication.cpp:2401
        p = 0x17f4630
        exposeEvent = {<QEvent> = {_vptr.QEvent = 0x7f563b433150 <vtable for QExposeEvent+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f563ab63040 <qt_meta_stringdata_QEvent>, data = 0x7f563ab62ac0 <qt_meta_data_QEvent>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}, d = 0x0, t = 206, posted = 0, spont = 1, m_accept = 1, reserved = 0}, rgn = {d = 0x216b680, static shared_empty = {ref = {_q_value = 3}, qt_rgn = 0x7f563b444a00 <qrp>}}}
#24 0x00007f563aeda995 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x1f14210) at kernel/qguiapplication.cpp:1473
        __PRETTY_FUNCTION__ = "static void QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)"
#25 0x00007f563aec3858 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:575
        event = 0x1f14210
        nevents = 2
#26 0x00007f5631e0f250 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:78
        userEventSource = <optimized out>
        dispatcher = <optimized out>
#27 0x00007f5637ffee04 in g_main_dispatch (context=0x7f5628001e10) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3064
        dispatch = 0x7f5631e0f240 <userEventSourceDispatch(GSource*, GSourceFunc, gpointer)>
        prev_source = 0x0
        was_in_call = 0
        user_data = 0x0
        callback = 0x0
        cb_funcs = <optimized out>
        cb_data = 0x0
        need_destroy = <optimized out>
        source = 0x17eae90
        current = 0x17d6070
        i = 2
#28 g_main_context_dispatch (context=context@entry=0x7f5628001e10) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3663
No locals.
#29 0x00007f5637fff048 in g_main_context_iterate (context=context@entry=0x7f5628001e10, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3734
        max_priority = 0
        timeout = 0
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = 8
        fds = 0x1ce60f0
#30 0x00007f5637fff0ec in g_main_context_iteration (context=0x7f5628001e10, may_block=1) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3795
        retval = <optimized out>
#31 0x00007f563aa0698c in QEventDispatcherGlib::processEvents (this=0x17edc00, flags=...) at kernel/qeventdispatcher_glib.cpp:426
        d = 0x17d2da0
        canWait = true
        savedFlags = {i = 0}
        result = <optimized out>
#32 0x00007f563a9b896b in QEventLoop::exec (this=this@entry=0x7fff838064d0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
        locker = {val = 23804384}
        __PRETTY_FUNCTION__ = "int QEventLoop::exec(QEventLoop::ProcessEventsFlags)"
        ref = {d = 0x2189540, locker = @0x7fff83806450, exceptionCaught = true}
        d = 0x2189540
#33 0x00007f563a9bf0e1 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1134
        threadData = 0x16b38d0
        __PRETTY_FUNCTION__ = "static int QCoreApplication::exec()"
        eventLoop = {<QObject> = {_vptr.QObject = 0x7f563adf3530 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f563ab04cc0 <qt_meta_stringdata_QObject>, data = 0x7f563ab04ba0 <qt_meta_data_QObject>, static_metacall = 0x7f563a9e8a90 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x2189540}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f563ab4f060 <qt_meta_stringdata_Qt>, data = 0x7f563ab4c9a0 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f563adeff80 <QObject::staticMetaObject>, stringdata = 0x7f563ab626a0 <qt_meta_stringdata_QEventLoop>, data = 0x7f563ab62640 <qt_meta_data_QEventLoop>, static_metacall = 0x7f563aa4ce70 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        returnCode = <optimized out>
#34 0x00007f563aed211c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1343
No locals.
#35 0x0000000000401e70 in main (argc=1, argv=<optimized out>) at main.cpp:31
        application = {<QGuiApplication> = {<QCoreApplication> = {<QObject> = {_vptr.QObject = 0x603d10 <vtable for FriendsApplication+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f563ab04cc0 <qt_meta_stringdata_QObject>, data = 0x7f563ab04ba0 <qt_meta_data_QObject>, static_metacall = 0x7f563a9e8a90 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x16b37c0}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f563ab4f060 <qt_meta_stringdata_Qt>, data = 0x7f563ab4c9a0 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f563adeff80 <QObject::staticMetaObject>, stringdata = 0x7f563ab62880 <qt_meta_stringdata_QCoreApplication>, data = 0x7f563ab62760 <qt_meta_data_QCoreApplication>, static_metacall = 0x7f563aa4cff0 <QCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static self = 0x7fff83806530}, static staticMetaObject = {d = {superdata = 0x7f563adf3680 <QCoreApplication::staticMetaObject>, stringdata = 0x7f563b184ca0 <qt_meta_stringdata_QGuiApplication>, data = 0x7f563b184b20 <qt_meta_data_QGuiApplication>, static_metacall = 0x7f563aedab10 <QGuiApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f563b432780 <QGuiApplication::staticMetaObject>, stringdata = 0x402dc0 <qt_meta_stringdata_FriendsApplication>, data = 0x402d80 <qt_meta_data_FriendsApplication>, static_metacall = 0x402ae0 <FriendsApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, m_view = 0x17b3170}