(gdb) bt full
#0  0x000000300b05caf9 in pixman_region_selfcheck () from /usr/lib64/libpixman-1.so.0
No symbol table info available.
#1  0x000000300b05e939 in pixman_region_fini () from /usr/lib64/libpixman-1.so.0
No symbol table info available.
#2  0x00000000004566d3 in RegionDestroy (pReg=0x22339d0) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/dix/region.c:253
No locals.
#3  0x0000000000570808 in miDestroyClip (pGC=0x21d82d0) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/mi/migc.c:68
No locals.
#4  0x0000000000514847 in damageDestroyClip (pGC=0x21d82d0) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/miext/damage/damage.c:493
        pGCPriv = 0x21d8370
#5  0x0000000000449c4e in FreeGC (value=0x21d82d0, gid=gid@entry=0) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/dix/gc.c:772
        pGC = 0x21d82d0
#6  0x000000000044a32f in FreeScratchGC (pGC=<optimized out>) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/dix/gc.c:1092
No locals.
#7  0x000000000055e8fa in dri2_copy_region (pDraw=pDraw@entry=0x20bbf10, pRegion=pRegion@entry=0x7fffae3742a0, pDest=pDest@entry=0x227f610, pSrc=pSrc@entry=0x2225f40) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/hw/xfree86/dri2/dri2.c:888
        pPriv = 0x2243a40
        ds = <optimized out>
        primeScreen = 0x16926c0
#8  0x000000000055fbc9 in DRI2SwapBuffers (client=client@entry=0x21d2720, pDraw=0x20bbf10, target_msc=target_msc@entry=0, divisor=divisor@entry=0, remainder=0, swap_target=swap_target@entry=0x7fffae374338, func=func@entry=0x560b49 <DRI2SwapEvent>, data=0x20bbf10) 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 = 0x1ca5d20
        ds = 0x1c88fe0
        pPriv = 0x2243a40
        pDestBuffer = 0x227f610
        pSrcBuffer = 0x2225f40
        ret = <optimized out>
        i = <optimized out>
        ust = 35464992
        current_msc = <optimized out>
        __func__ = "DRI2SwapBuffers"
#9  0x0000000000561157 in ProcDRI2SwapBuffers (client=0x21d2720) 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 = 0x21d8e80
        pDrawable = 0x20bbf10
        target_msc = 0
        divisor = 0
#10 ProcDRI2Dispatch (client=0x21d2720) at /var/tmp/portage/x11-base/xorg-server-1.14.0/work/xorg-server-1.14.0/hw/xfree86/dri2/dri2ext.c:610
        stuff = 0x21d8e80
#11 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 = 0x1f3cae0
        result = 0
        client = 0x21d2720
        nready = 0
        icheck = 0x80bf90 <checkForInput>
        start_tick = 0
#12 0x00000000004282ed in main (argc=11, argv=0x7fffae374518, 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}