https://bugs.freedesktop.org/show_bug.cgi?id=104831
--- Comment #3 from Martin Bednar martin@serafean.cz --- Just booted with 18.0-rc3. Plasma started up just fine. Alt+tab in kwin however... Different bug? #6 0x00007f5b039615bd in r600_draw_vbo () from /usr/lib64/dri/r600_dri.so #7 0x00007f5b03869ba4 in u_vbuf_draw_vbo () from /usr/lib64/dri/r600_dri.so #8 0x00007f5b03647457 in st_draw_vbo () from /usr/lib64/dri/r600_dri.so #9 0x00007f5b0360a108 in vbo_validated_drawrangeelements () from /usr/lib64/dri/r600_dri.so #10 0x00007f5b0360a89f in vbo_exec_DrawElements () from /usr/lib64/dri/r600_dri.so #11 0x00007f5b2ab96551 in QSGBatchRenderer::Renderer::renderMergedBatch(QSGBatchRenderer::Batch const*) () from /usr/lib64/libQt5Quick.so.5