Press ctrl+shift+t to slice up the screen into additional views... Open about five and then start closing them as fast as you can (click one X more than twice before it can close), typestuff or click stuff until it crashes, it should seg fault. Using: Version 15.08.2 KDE Frameworks 5.15.0 Qt 5.4.2 (built against 5.4.2) The xcb windowing system
Cannot reproduce, may be fixed meanwhile.