(gdb) bt
#0  0x00007fffee8a169b in QImage::detach() () from /usr/lib/libQt5Gui.so.5
#1  0x00007fffee8a1788 in QImage::scanLine(int) () from /usr/lib/libQt5Gui.so.5
#2  0x00007fffe417ebbf in Breeze::BoxShadowRenderer::render() const () from /usr/lib/libbreezecommon5.so.5
#3  0x00007fffffffdf70 in ?? ()
#4  0xb035cc0db472d300 in ?? ()
#5  0x000055555593fd60 in ?? ()
#6  0x00005555559334d0 in ?? ()
#7  0x00007fffffffdad0 in ?? ()
#8  0x00007fffffffdac0 in ?? ()
#9  0x00007fffffffdae0 in ?? ()
#10 0x00007fffffffdba0 in ?? ()
#11 0x00007fffffffdf70 in ?? ()
#12 0x00007fffdfe55092 in ?? () from /usr/lib/qt/plugins/styles/breeze.so
#13 0x00007fffdfe621c5 in ?? () from /usr/lib/qt/plugins/styles/breeze.so
#14 0x00007fffdfe6857e in ?? () from /usr/lib/qt/plugins/styles/breeze.so
#15 0x00007fffdfe78275 in ?? () from /usr/lib/qt/plugins/styles/breeze.so
#16 0x00007ffff76aadee in QStyleFactory::create(QString const&) () from /usr/lib/libQt5Widgets.so.5
#17 0x00007ffff763a55a in QApplication::style() () from /usr/lib/libQt5Widgets.so.5
#18 0x00007ffff763aade in QApplicationPrivate::initialize() () from /usr/lib/libQt5Widgets.so.5
#19 0x00007ffff763ad98 in QApplicationPrivate::init() () from /usr/lib/libQt5Widgets.so.5
#20 0x00007ffff7c82061 in QtSingleApplication::QtSingleApplication(int&, char**, bool) () from /usr/lib/libFalkonPrivate.so.3
#21 0x00007ffff7cb866d in MainApplication::MainApplication(int&, char**) () from /usr/lib/libFalkonPrivate.so.3
#22 0x00005555555572f6 in ?? ()
#23 0x00007ffff6c16153 in __libc_start_main () from /usr/lib/libc.so.6
#24 0x000055555555766e in _start ()