(gdb) bt full
#0  _glamor_create_linear_gradient_program (screen=screen@entry=0x21b61c0, stops_count=stops_count@entry=0, dyn_gen=0) at /var/tmp/portage/x11-libs/glamor-9999/work/glamor-9999/src/glamor_gradient.c:617
        glamor_priv = 0x21b9510
        dispatch = 0x21b9510
        index = 0
        gradient_prog = 16
        gradient_fs = 0x23d12a0 "\260\024=\002"
        fs_main_prog = 18
        fs_getcolor_prog = 19
        vs_prog = 17
        gradient_vs = 0x7f4021beca28 "precision mediump float;\nattribute vec4 v_position;\nattribute vec4 v_texcoord;\nvarying vec2 source_texture;\n\nvoid main()\n{\n    gl_Position = v_position;\n    source_texture = v_texcoord.xy;\n}\n"
#1  0x00007f4021bd8b8d in glamor_init_gradient_shader (screen=screen@entry=0x21b61c0) at /var/tmp/portage/x11-libs/glamor-9999/work/glamor-9999/src/glamor_gradient.c:663
        glamor_priv = 0x64616853
        i = <optimized out>
#2  0x00007f4021bc83c0 in glamor_init (screen=screen@entry=0x21b61c0, flags=flags@entry=15) at /var/tmp/portage/x11-libs/glamor-9999/work/glamor-9999/src/glamor.c:429
        glamor_priv = 0x21b9510
        gl_version = <optimized out>
        ps = 0x21b91c0
#3  0x00007f40205d4bc5 in radeon_glamor_init (screen=screen@entry=0x21b61c0) at /var/tmp/portage/x11-drivers/xf86-video-ati-9999/work/xf86-video-ati-9999/src/radeon_glamor.c:253
        scrn = 0x2117f50
#4  0x00007f402058beb1 in RADEONAccelInit (pScreen=pScreen@entry=0x21b61c0) at /var/tmp/portage/x11-drivers/xf86-video-ati-9999/work/xf86-video-ati-9999/src/radeon_accel.c:186
        pScrn = <optimized out>
        info = 0x2120bf0
#5  0x00007f40205d00ce in RADEONScreenInit_KMS (pScreen=0x21b61c0, argc=<optimized out>, argv=<optimized out>) at /var/tmp/portage/x11-drivers/xf86-video-ati-9999/work/xf86-video-ati-9999/src/radeon_kms.c:1227
        pScrn = 0x2117f50
        info = 0x2120bf0
        subPixelOrder = <optimized out>
        s = <optimized out>
        front_ptr = 0x0
        ret = <optimized out>
#6  0x0000000000438c70 in AddGPUScreen (pfnInit=0x7f40205cfc24 <RADEONScreenInit_KMS>, argc=argc@entry=1, argv=argv@entry=0x7fff2a9ddac8) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/dix/dispatch.c:3890
        i = 0
        pScreen = 0x21b61c0
        ret = 0
#7  0x00000000004794a8 in InitOutput (pScreenInfo=pScreenInfo@entry=0x811d20 <screenInfo>, argc=argc@entry=1, argv=argv@entry=0x7fff2a9ddac8) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/hw/xfree86/common/xf86Init.c:857
        pScrn = 0x2117f50
        i = <optimized out>
        j = <optimized out>
        k = <optimized out>
        scr_index = <optimized out>
        modulelist = <optimized out>
        optionlist = 0x2107840
        screenpix24 = <optimized out>
        pix24 = <optimized out>
        pix24From = <optimized out>
        pix24Fail = 0
        autoconfig = <optimized out>
        sigio_blocked = 0
        want_hw_access = <optimized out>
        configured_device = <optimized out>
#8  0x0000000000428053 in main (argc=1, argv=0x7fff2a9ddac8, envp=<optimized out>) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/dix/main.c:204
        i = <optimized out>
        alwaysCheckForInput = {0, 1}