(gdb) bt full
#0  0x00007f6078b6a25d in memset (__len=3168, __ch=0, __dest=0x0) at /usr/include/bits/string3.h:84
No locals.
#1  RADEONSetSharedPixmapBacking (ppix=0x3096870, fd_handle=<optimized out>, surface=surface@entry=0x0) at /var/tmp/portage/x11-drivers/xf86-video-ati-9999/work/xf86-video-ati-9999/src/radeon_bo_helper.c:212
        pScrn = <optimized out>
        info = 0x23f7b30
        bo = 0x3069520
        ihandle = 47
        size = <optimized out>
#2  0x00007f6078b6a588 in radeon_glamor_set_shared_pixmap_backing (pixmap=<optimized out>, handle=<optimized out>) at /var/tmp/portage/x11-drivers/xf86-video-ati-9999/work/xf86-video-ati-9999/src/radeon_glamor.c:304
        priv = 0x0
#3  0x000000000045259e in PixmapShareToSlave (pixmap=pixmap@entry=0x30ef100, slave=slave@entry=0x2493680) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/dix/pixmap.c:157
        spix = 0x3096870
        ret = <optimized out>
        handle = 0x2f
        master = <optimized out>
        depth = 24
#4  0x000000000055f25f in DRI2UpdatePrime (pDraw=pDraw@entry=0x2eb8970, pDest=pDest@entry=0x3091280) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/hw/xfree86/dri2/dri2.c:863
        pPriv = 0x2eb37a0
        spix = <optimized out>
        mpix = 0x30ef100
        master = <optimized out>
        slave = 0x2493680
        ret = <optimized out>
#5  0x00007f6078b612a2 in radeon_dri2_copy_region2 (pScreen=0x2493680, drawable=0x2eb8970, region=0x7fff0ca61dc0, dest_buffer=0x3091280, src_buffer=<optimized out>) at /var/tmp/portage/x11-drivers/xf86-video-ati-9999/work/xf86-video-ati-9999/src/radeon_dri2.c:422
        src_private = <optimized out>
        dst_private = 0x3091720
        pScrn = <optimized out>
        src_drawable = 0x30713a0
        dst_drawable = 0x0
        copy_clip = <optimized out>
        gc = <optimized out>
        info = 0x23f7b30
        vsync = <optimized out>
        translate = 0
        off_x = 0
        off_y = 0
        dst_ppix = 0x0
#6  0x000000000055e8fa in dri2_copy_region (pDraw=pDraw@entry=0x2eb8970, pRegion=pRegion@entry=0x7fff0ca61dc0, pDest=pDest@entry=0x3091280, pSrc=pSrc@entry=0x3091250) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/hw/xfree86/dri2/dri2.c:888
        pPriv = 0x2eb37a0
        ds = <optimized out>
        primeScreen = 0x2493680
#7  0x000000000055fbc9 in DRI2SwapBuffers (client=client@entry=0x3075240, pDraw=0x2eb8970, target_msc=target_msc@entry=0, divisor=divisor@entry=0, remainder=0, swap_target=swap_target@entry=0x7fff0ca61e58, func=func@entry=0x560b49 <DRI2SwapEvent>, data=0x2eb8970) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/hw/xfree86/dri2/dri2.c:1137
        box = {x1 = 0, y1 = 0, x2 = <optimized out>, y2 = <optimized out>}
        region = {extents = {x1 = 0, y1 = 0, x2 = 300, y2 = 300}, data = 0x0}
        pScreen = 0x2aa6a60
        ds = 0x2a91f50
        pPriv = 0x2eb37a0
        pDestBuffer = 0x3091280
        pSrcBuffer = 0x3091250
        ret = <optimized out>
        i = <optimized out>
        ust = 50811456
        current_msc = <optimized out>
        __func__ = "DRI2SwapBuffers"
#8  0x0000000000561157 in ProcDRI2SwapBuffers (client=0x3075240) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/hw/xfree86/dri2/dri2ext.c:413
        rep = {type = 1 '\001', pad1 = 0 '\000', sequenceNumber = 34, length = 0, swap_hi = 0, swap_lo = 0, pad2 = 0, pad3 = 0, pad4 = 0, pad5 = 0}
        remainder = <optimized out>
        swap_target = <optimized out>
        status = <optimized out>
        stuff = 0x3096a60
        pDrawable = 0x2eb8970
        target_msc = 0
        divisor = 0
#9  ProcDRI2Dispatch (client=0x3075240) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/hw/xfree86/dri2/dri2ext.c:610
        stuff = 0x3096a60
#10 0x000000000043895b in Dispatch () at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/dix/dispatch.c:432
        clientReady = 0x2da9610
        result = 0
        client = 0x3075240
        nready = 0
        icheck = 0x80bf90 <checkForInput>
        start_tick = 0
#11 0x00000000004282ed in main (argc=11, argv=0x7fff0ca62038, envp=<optimized out>) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/dix/main.c:295
        i = <optimized out>
        alwaysCheckForInput = {0, 1}