(gdb) bt
#0  0x00000000 in ?? ()
#1  0xb68c3428 in glGenTextures (this=<optimized out>, textures=0x144b090, n=1) at opengl/qopengltexturehelper_p.h:508
#2  QOpenGLTexturePrivate::create (this=0x144b080) at opengl/qopengltexture.cpp:169
#3  0xb68c8fc2 in QOpenGLTexture::setMinificationFilter (this=<optimized out>, filter=QOpenGLTexture::Nearest) at opengl/qopengltexture.cpp:3221
#4  0xb3434116 in ?? () from /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqpa-ubuntumirclient.so
#5  0xb34341c0 in ?? () from /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqpa-ubuntumirclient.so
#6  0xb67cfcd2 in QBackingStore::flush (this=this@entry=0x1429bc8, region=..., win=<optimized out>, offset=...) at painting/qbackingstore.cpp:105
#7  0xb69fecc2 in QWidgetBackingStore::qt_flush (widget=0x141def0, region=..., backingStore=0x1429bc8, tlw=<optimized out>, tlwOffset=..., widgetTextures=0x0, widgetBackingStore=0x14201a8) at kernel/qwidgetbackingstore.cpp:118
#8  0xb69ff64c in QWidgetBackingStore::flush (this=this@entry=0x14201a8, widget=widget@entry=0x0) at kernel/qwidgetbackingstore.cpp:1245
#9  0xb6a00728 in endPaint (beginPaintInfo=<synthetic pointer>, backingStore=<optimized out>, cleaned=..., this=0x14201a8) at kernel/qwidgetbackingstore.cpp:335
#10 QWidgetBackingStore::doSync (this=this@entry=0x14201a8) at kernel/qwidgetbackingstore.cpp:1233
#11 0xb6a008a4 in QWidgetBackingStore::sync (this=0x14201a8) at kernel/qwidgetbackingstore.cpp:1036
#12 0xb6a16584 in QWidgetPrivate::syncBackingStore (this=0x141e230) at kernel/qwidget.cpp:1886
#13 0xb6a24636 in QWidget::event (this=this@entry=0x141def0, event=event@entry=0x14654c8) at kernel/qwidget.cpp:8961
#14 0xb6add6c8 in QMainWindow::event (this=0x141def0, event=0x14654c8) at widgets/qmainwindow.cpp:1495
#15 0xb6f12b26 in KMainWindow::event(QEvent*) () from /usr/lib/arm-linux-gnueabihf/libKF5XmlGui.so.5
#16 0xb69f6ef4 in QApplicationPrivate::notify_helper (this=this@entry=0x138a500, receiver=receiver@entry=0x141def0, e=e@entry=0x14654c8) at kernel/qapplication.cpp:3720
#17 0xb69fade4 in QApplication::notify (this=0xbec550f0, receiver=0x141def0, e=0x14654c8) at kernel/qapplication.cpp:3503
#18 0xb6480a88 in QCoreApplication::notifyInternal (this=0xbec550f0, receiver=receiver@entry=0x141def0, event=event@entry=0x14654c8) at kernel/qcoreapplication.cpp:935
#19 0xb6482294 in sendEvent (event=0x14654c8, receiver=0x141def0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#20 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x138a5d0) at kernel/qcoreapplication.cpp:1552
#21 0xb648268a in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#22 0xb64bb660 in postEventSourceDispatch (s=0x13f26a8) at kernel/qeventdispatcher_glib.cpp:271
#23 0xb59d9f68 in g_main_context_dispatch () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0
#24 0xb59da114 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0
Backtrace stopped: previous frame identical to this frame (corrupt stack?)