Out of the backend I tried (xv, gl_nosw, x11, sdl/x11, gl, gl2) xv seems to be causing the problem. I am currently using the backend x11 and have yet to observe a crash using it. However during my tesing cauing the crash was not as reliable as in real-world usage before but at the time of the crash I had only (two) mplayers with xv backend running.
Out of the backend I tried (xv, gl_nosw, x11, sdl/x11, gl, gl2) xv seems to be causing the problem. I am currently using the backend x11 and have yet to observe a crash using it. However during my tesing cauing the crash was not as reliable as in real-world usage before but at the time of the crash I had only (two) mplayers with xv backend running.