(gdb) bt full
#0  0xb73b1553 in nouveau_dri2_create_buffer (pDraw=0xa473b90, attachment=0, format=32)
    at ../../src/nouveau_dri2.c:72
        pScreen = <value optimised out>
        pNv = 0x9f296f8
        nvbuf = 0xa2263e0
        ppix = 0xa473b90
#1  0xb73f3f30 in allocate_or_reuse_buffer (pDraw=0xa473b90, pPriv=0xa46ec80, attachment=0,
    format=32, dimensions_match=1, buffer=0xa4f3ad0, ds=<value optimised out>)
    at ../../../../hw/xfree86/dri2/dri2.c:343
        old_buf = 0
#2  0xb73f4a0b in do_get_buffers (pDraw=0xa473b90, width=0xbfe5cc60, height=0xbfe5cc6c,
    attachments=0xa3fa210, count=1, out_count=0xbfe5cc68, has_format=1)
    at ../../../../hw/xfree86/dri2/dri2.c:412
        attachment = <value optimised out>
        format = 32
        ds = 0x9f238e0
        pPriv = 0xa46ec80
        buffers = 0xa4f3ad0
        need_real_front = <value optimised out>
        need_fake_front = <value optimised out>
        have_fake_front = <value optimised out>
        front_format = <value optimised out>
        dimensions_match = 1
        buffers_changed = <value optimised out>
        i = <value optimised out>
#3  0xb73f6717 in ProcDRI2GetBuffersWithFormat (client=0xa23e140)
    at ../../../../hw/xfree86/dri2/dri2ext.c:302
        buffers = <value optimised out>
        status = 0
        count = <value optimised out>
        stuff = <value optimised out>
        pDrawable = 0xa473b90
        width = <value optimised out>
        height = <value optimised out>
        attachments = 0xa3fa208
#4  ProcDRI2Dispatch (client=0xa23e140) at ../../../../hw/xfree86/dri2/dri2ext.c:568
        stuff = <value optimised out>
#5  0x0806f8d7 in Dispatch () at ../../dix/dispatch.c:431
        clientReady = 0xa1de2f0
        result = <value optimised out>
        client = 0xa23e140
        nready = 0
        icheck = 0x8207818
        start_tick = 1140
#6  0x0806284c in main (argc=8, argv=0xbfe5cdf4, envp=0xbfe5ce18) at ../../dix/main.c:287
        i = <value optimised out>
        alwaysCheckForInput = {0, 1}