(gdb) bt f
#0  radeonRefillCurrentDmaRegion (rmesa=0x8db9fc0, size=32) at ../radeon/radeon_bo_drm.h:148
        __FUNCTION__ = "radeonRefillCurrentDmaRegion"
#1  0xb13315ea in radeonAllocDmaRegion (rmesa=0x8db9fc0, pbo=0x8dba3c8, poffset=0x8dba3cc, bytes=32, alignment=<value optimized out>)
    at radeon_dma.c:228
        __FUNCTION__ = "radeonAllocDmaRegion"
        __PRETTY_FUNCTION__ = "radeonAllocDmaRegion"
#2  0xb13317af in rcommon_emit_vector (ctx=0x8f25380, aos=0x8dba3c8, data=0x919db00, size=2, stride=16, count=4) at radeon_dma.c:145
        rmesa = (radeonContextPtr) 0xa5b06b8
        out = <value optimized out>
        __PRETTY_FUNCTION__ = "rcommon_emit_vector"
#3  0xb132707e in r300EmitArrays (ctx=0x8f25380) at r300_emit.c:302
        ci = <value optimized out>
        rmesa = (r300ContextPtr) 0x8db9fc0
        tnl = (TNLcontext *) 0x91adb08
        nr = 2
        count = 4
        i = 0
        InputsRead = 257
        OutputsWritten = 17
        inputs = (int *) 0xa402a84
        vir_inputs = {171109272, -1080947416, -1080947388, 172588944, 1694416, 1, 0, 0, 6, 6, 159010144, 171973232, -1080947312,
  -1080947288, -1322119683, 171973236, -1322187698, 704, 0, 159137416, 148611008, 16, -1320087564, 0, 150098816, -1080947304, -1322171902,
  150098816, 134217728, 8, -1320087564, 172607952}
        tab = {0, 8, 171109304, -1212088000, -1080947496, -1213055258, -1212088000, 171109304, 8, -1212092428, 8, 171109296, 16, 171407544,
  -1212088000, 150102752, 0, -1080947320, -1320755832, 153403592, -1080947388, 44, -1322042609, 171109304, 8, -1080947368, -1322045140,
  159010144, 10, -523321299, -1322043334, 171109224}
        swizzle = {{0, 1, 4, 5}, {0, 1, 4, 5}, {-1071094743, -1080948028, -1216389132, -1080947948}, {141771608, -1080948028, -1209573388,
    173744100}, {1, 0, 0, 0}, {0, 1, 65536, -1080947864}, {-1080947868, 1, -1216389132, 141837392}, {141829464, -1080947848, -1216919049,
    10}, {-1080947908, -1080947928, 134688375, 173744100}, {173744100, -1080947808, 134688375, -1218711564}, {173743360, -1080947896,
    -1218763470, 173743360}, {-1218711012, -1080947880, -1216389132, 63}, {-486313984, -1080947880, -1216586616, 173743336}, {-1216389132,
    -1080947768, -1216569145, 173743336}, {65536, 2, 662, 141837392}, {141829464, 28, 8277996, 17}, {-1213064623, -1213068172, 173743664,
    56}, {1128660992, -1216402565, 141856960, 141837392}, {-1213064623, -1212208338, -1212201560, -1212214066}, {-1212214246, 173743664,
    170871608, -1213064623}, {-1212087928, -1212208338, -1212201560, -1212214066}, {-1212214246, 173743336, -1321252640, -1213064623}, {
    -1212087944, -1213068172, 10, 2}, {0, 171109224, -1212087952, -1213064623}, {-1212208338, 173743336, -1212088000, 6}, {1, 171952728,
    -1212087952, -1212087952}, {-1212208338, -1212201560, -1212214066, -1212214246}, {173743176, -1080947596, -1213058995, -1212087944}, {
    16, 2, -1212092428, 171109224}, {171109304, -1080947564, -1213059567, -1212088000}, {173743336, 60, -1320087564, 0}, {-1320423686, 16,
    171109296, 16}}
        prog = <value optimized out>
        __PRETTY_FUNCTION__ = "r300EmitArrays"
#4  0xb1316261 in r300RunRender (ctx=0x8f25380, stage=<value optimized out>) at r300_render.c:395
        rmesa = (r300ContextPtr) 0x8db9fc0
        i = <value optimized out>
        __FUNCTION__ = "r300RunRender"
#5  0xb13d2854 in _tnl_run_pipeline (ctx=0x8f25380) at tnl/t_pipeline.c:158
        tnl = (TNLcontext *) 0x91adb08
        __tmp = 895
        i = 0
        mask = 63
#6  0xb13d2e65 in _tnl_draw_prims (ctx=0x8f25380, arrays=0x919c194, prim=0x919ac38, nr_prims=1, ib=0x0, min_index=0, max_index=3)
    at tnl/t_draw.c:431
        bo = {0xbf920f08, 0xb13140dd, 0x8f25380, 0x30000000, 0x8db9fc0, 0xb1510ff4, 0x0, 0xa49c9d0, 0xbf920f58, 0xb13965c8, 0xb7ec605c,
  0x30000000, 0x183b, 0x0, 0x1, 0x2, 0x7, 0xb1510ff4, 0x8f25380, 0x8f25380, 0xbf920f58, 0xb13afd3d, 0x87483f0, 0xa32eb68, 0xbf920f68,
  0xb1510ff4, 0x8f25380, 0xb1510ff4, 0xbf920f78, 0xb1396bc2, 0x8f25380, 0x8dba0a8, 0x7}
        nr_bo = 0
        tnl = (TNLcontext *) 0x91adb08
#7  0xb13cb30c in vbo_exec_vtx_flush (exec=0x919ab18, unmap=1 '\001') at vbo/vbo_exec_draw.c:350
        ctx = (GLcontext *) 0x8f25380
#8  0xb13c80c0 in vbo_exec_FlushVertices_internal (ctx=0x8f25380, unmap=0 '\0') at vbo/vbo_exec_api.c:760
        exec = (struct vbo_exec_context *) 0x919ab18
#9  0xb13c8170 in vbo_exec_FlushVertices (ctx=0x8f25380, flags=1) at vbo/vbo_exec_api.c:782
No locals.
#10 0xb1394499 in _mesa_set_scissor (ctx=0x8f25380, x=2, y=1047, width=1370, height=1) at main/scissor.c:75
No locals.
#11 0xb1394546 in _mesa_Scissor (x=2, y=1047, width=1370, height=1) at main/scissor.c:48
        ctx = (GLcontext *) 0xa5b06b8
#12 0xb7838b8e in __glXDisp_Scissor (pc=0xa52747c "\002") at ../../glx/indirect_dispatch.c:1056
No locals.
#13 0xb786346f in __glXDisp_Render (cl=0x8a21648, pc=0xa527478 "\024") at ../../glx/glxcmds.c:1783
        entry = {bytes = 20, varsize = 0}
        extra = <value optimized out>
        proc = (__GLXdispatchRenderProcPtr) 0xb7838b50 <__glXDisp_Scissor>
        err = 0
        client = (ClientPtr) 0x8a212d8
        left = 7952
        cmdlen = 20
        error = -1080946440
        commandsDone = 28
        glxc = (__GLXcontext *) 0x8748600
        sw = <value optimized out>
#14 0xb7867d6a in __glXDispatch (client=0x8a212d8) at ../../glx/glxext.c:523
        stuff = (xGLXSingleReq *) 0xa527328
        opcode = 1 '\001'
        cl = (__GLXclientState *) 0x8a21648
        retval = 1
#15 0x0808d57f in Dispatch () at ../../dix/dispatch.c:437
        result = <value optimized out>
        client = (ClientPtr) 0x8a212d8
        nready = 0
        start_tick = 27300
#16 0x080722ed in main (argc=8, argv=0xbf921264, envp=0x0) at ../../dix/main.c:397
        i = <value optimized out>
        alwaysCheckForInput = {0, 1}