I succeded into making a segfault with geany.
I'm using geany 1.22 and GTK 2.24.17 under KDE. The problem also appears under Unity. I didn't tested it under other desktop environement but I thik it should also works.
Before all I should appologize : I'm using a french computer so the name of the different menus or buttons I will give you will probably not be exact.
You simply have to search an expression in a page. At the end of this search a pop up asking if you want to search again appears. Now you have to close the page you were reading ( by using the top rigth cross button under KDE or the menu under Unity or KDE). The pop up is still opened. Just click on "search again". And the programm should now segfault.