(gdb) bt f
#0  __memset_avx2_erms () at ../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S:151
#1  0x00007fe67dcc13f6 in memset (__len=<optimized out>, __ch=0, __dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string_fortified.h:71
        nbox = <optimized out>
        box = 0x7ffd22e9d5c0
        pixel = 0
        sna = <optimized out>
        pixmap = <optimized out>
        priv = <optimized out>
        bo = <optimized out>
        damage = 0x58930
        region = {extents = {x1 = 0, y1 = 0, x2 = 32767, y2 = 22049}, data = 0x0}
        stack_boxes = {{x1 = 0, y1 = 0, x2 = 32767, y2 = 22049}, {x1 = 0, y1 = 768, x2 = 0, y2 = 0}, {x1 = 1, y1 = 0, x2 = 0, y2 = 0}, {x1 = 6208, y1 = 24748, x2 = 22063, y2 = 0}, {x1 = 29, y1 = 0, x2 = 0, y2 = 0}, {x1 = 31515, y1 = 24473, x2 = 22063, y2 = 0}, {x1 = -21552, y1 = 24849, x2 = 22063, y2 = 0}, {x1 = 31458, y1 = 24473, x2 = 22063, y2 = 0}, {x1 = 1504, y1 = 24504, x2 = 22063, y2 = 0}, {x1 = -21552, y1 = 24849, x2 = 22063, y2 = 0}, {x1 = 0, y1 = 0, x2 = 2, y2 = 0}, {x1 = -25728, y1 = 32379, x2 = 32742, y2 = 0}, {x1 = -22512, y1 = -21440, x2 = 0, y2 = 0}, {x1 = -25735, y1 = 32358, x2 = 32742, y2 = 0}, {x1 = 6208, y1 = 24748, x2 = 22063, y2 = 0}, {x1 = -32240, y1 = 24831, x2 = 22063, y2 = 0}, {x1 = 0, y1 = 0, x2 = 0, y2 = 0}, {x1 = -5488, y1 = 24811, x2 = 22063, y2 = 0}, {x1 = 25, y1 = 0, x2 = 0, y2 = 0}, {x1 = 31935, y1 = 32358, x2 = 32742, y2 = 0}, {x1 = 576, y1 = 24834, x2 = 22063, y2 = 0}, {x1 = 32531, y1 = 24483, x2 = 22063, y2 = 0}, {x1 = 4258, y1 = 0, x2 = 0, y2 = 0}, {x1 = -11840, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = -11920, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = 12496, y1 = 24505, x2 = 22063, y2 = 0}, {x1 = -10512, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = 32531, y1 = 24483, x2 = 22063, y2 = 0}, {x1 = 2687, y1 = 2756, x2 = 0, y2 = 0}, {x1 = -11840, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = -11920, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = 32531, y1 = 24483, x2 = 22063, y2 = 0}, {x1 = -10464, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = -11840, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = -11920, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = 12496, y1 = 24505, x2 = 22063, y2 = 0}, {x1 = -10432, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = -19572, y1 = 24472, x2 = 22063, y2 = 0}, {x1 = -5840, y1 = 24811, x2 = 22063, y2 = 0}, {x1 = -10388, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = 10, y1 = 0, x2 = 0, y2 = 0}, {x1 = -10176, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = 32, y1 = 768, x2 = 0, y2 = 0}, {x1 = 9486, y1 = 24483, x2 = 22063, y2 = 0}, {x1 = -5840, y1 = 24811, x2 = 22063, y2 = 0}, {x1 = 32, y1 = 768, x2 = 10, y2 = 0}, {x1 = -10352, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = 1, y1 = 0, x2 = 0, y2 = 0}, {x1 = -24560, y1 = -1154, x2 = 32740, y2 = 0}, {x1 = -31912, y1 = 24474, x2 = 22063, y2 = 0}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = -24560, y1 = -1154, x2 = 32740, y2 = 0}, {x1 = 18299, y1 = 24485, x2 = 22063, y2 = 0}, {x1 = 0, y1 = 0, x2 = 32767, y2 = 22049}, {x1 = 1280, y1 = 23074, x2 = 4650, y2 = 28142}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = -3200, y1 = 24715, x2 = 22063, y2 = 0}, {x1 = -1016, y1 = 24816, x2 = 22063, y2 = 0}, {x1 = -1008, y1 = 24816, x2 = 22063, y2 = 0}, {x1 = 26373, y1 = 24485, x2 = 22063, y2 = 0}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = -31619, y1 = 24485, x2 = 22063, y2 = 0}}
        boxes = 0x7ffd22e9d5e0
        b = <optimized out>
        dst_x = <optimized out>
        dst_y = <optimized out>
        i = <optimized out>
        num_boxes = 1
        hint = 1
#2  sna_composite_rectangles (op=<optimized out>, dst=<optimized out>, color=<optimized out>, num_rects=<optimized out>, rects=<optimized out>) at ../../../src/sna/sna_composite.c:1170
        nbox = <optimized out>
        box = 0x7ffd22e9d5c0
        pixel = 0
        sna = <optimized out>
        pixmap = <optimized out>
        priv = <optimized out>
        bo = <optimized out>
        damage = 0x58930
        region = {extents = {x1 = 0, y1 = 0, x2 = 32767, y2 = 22049}, data = 0x0}
        stack_boxes = {{x1 = 0, y1 = 0, x2 = 32767, y2 = 22049}, {x1 = 0, y1 = 768, x2 = 0, y2 = 0}, {x1 = 1, y1 = 0, x2 = 0, y2 = 0}, {x1 = 6208, y1 = 24748, x2 = 22063, y2 = 0}, {x1 = 29, y1 = 0, x2 = 0, y2 = 0}, {x1 = 31515, y1 = 24473, x2 = 22063, y2 = 0}, {x1 = -21552, y1 = 24849, x2 = 22063, y2 = 0}, {x1 = 31458, y1 = 24473, x2 = 22063, y2 = 0}, {x1 = 1504, y1 = 24504, x2 = 22063, y2 = 0}, {x1 = -21552, y1 = 24849, x2 = 22063, y2 = 0}, {x1 = 0, y1 = 0, x2 = 2, y2 = 0}, {x1 = -25728, y1 = 32379, x2 = 32742, y2 = 0}, {x1 = -22512, y1 = -21440, x2 = 0, y2 = 0}, {x1 = -25735, y1 = 32358, x2 = 32742, y2 = 0}, {x1 = 6208, y1 = 24748, x2 = 22063, y2 = 0}, {x1 = -32240, y1 = 24831, x2 = 22063, y2 = 0}, {x1 = 0, y1 = 0, x2 = 0, y2 = 0}, {x1 = -5488, y1 = 24811, x2 = 22063, y2 = 0}, {x1 = 25, y1 = 0, x2 = 0, y2 = 0}, {x1 = 31935, y1 = 32358, x2 = 32742, y2 = 0}, {x1 = 576, y1 = 24834, x2 = 22063, y2 = 0}, {x1 = 32531, y1 = 24483, x2 = 22063, y2 = 0}, {x1 = 4258, y1 = 0, x2 = 0, y2 = 0}, {x1 = -11840, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = -11920, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = 12496, y1 = 24505, x2 = 22063, y2 = 0}, {x1 = -10512, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = 32531, y1 = 24483, x2 = 22063, y2 = 0}, {x1 = 2687, y1 = 2756, x2 = 0, y2 = 0}, {x1 = -11840, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = -11920, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = 32531, y1 = 24483, x2 = 22063, y2 = 0}, {x1 = -10464, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = -11840, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = -11920, y1 = 24717, x2 = 22063, y2 = 0}, {x1 = 12496, y1 = 24505, x2 = 22063, y2 = 0}, {x1 = -10432, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = -19572, y1 = 24472, x2 = 22063, y2 = 0}, {x1 = -5840, y1 = 24811, x2 = 22063, y2 = 0}, {x1 = -10388, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = 10, y1 = 0, x2 = 0, y2 = 0}, {x1 = -10176, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = 32, y1 = 768, x2 = 0, y2 = 0}, {x1 = 9486, y1 = 24483, x2 = 22063, y2 = 0}, {x1 = -5840, y1 = 24811, x2 = 22063, y2 = 0}, {x1 = 32, y1 = 768, x2 = 10, y2 = 0}, {x1 = -10352, y1 = 8937, x2 = 32765, y2 = 0}, {x1 = 1, y1 = 0, x2 = 0, y2 = 0}, {x1 = -24560, y1 = -1154, x2 = 32740, y2 = 0}, {x1 = -31912, y1 = 24474, x2 = 22063, y2 = 0}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = -24560, y1 = -1154, x2 = 32740, y2 = 0}, {x1 = 18299, y1 = 24485, x2 = 22063, y2 = 0}, {x1 = 0, y1 = 0, x2 = 32767, y2 = 22049}, {x1 = 1280, y1 = 23074, x2 = 4650, y2 = 28142}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = -3200, y1 = 24715, x2 = 22063, y2 = 0}, {x1 = -1016, y1 = 24816, x2 = 22063, y2 = 0}, {x1 = -1008, y1 = 24816, x2 = 22063, y2 = 0}, {x1 = 26373, y1 = 24485, x2 = 22063, y2 = 0}, {x1 = 3632, y1 = 24843, x2 = 22063, y2 = 0}, {x1 = -31619, y1 = 24485, x2 = 22063, y2 = 0}}
        boxes = 0x7ffd22e9d5e0
        b = <optimized out>
        dst_x = <optimized out>
        dst_y = <optimized out>
        i = <optimized out>
        num_boxes = 1
        hint = 1
#3  0x0000562f5fa5c133 in ProcRenderFillRectangles (client=0x562f60ebe930) at ../../../../render/render.c:1414
        pDst = 0x562f610b0e30
        things = <optimized out>
        stuff = <optimized out>
#4  0x0000562f5f985ee4 in Dispatch () at ../../../../dix/dispatch.c:478
        result = <optimized out>
        client = 0x562f60ebe930
        start_tick = 130
#5  0x0000562f5f989f94 in dix_main (argc=11, argv=0x7ffd22e9d9f8, envp=<optimized out>) at ../../../../dix/main.c:276
        i = <optimized out>
        alwaysCheckForInput = {0, 1}
#6  0x00007fe67e5f61e3 in __libc_start_main (main=0x562f5f973a00 <main>, argc=11, argv=0x7ffd22e9d9f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd22e9d9e8) at ../csu/libc-start.c:308
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -6042125824048082697, 94761467197968, 140725189204464, 0, 0, -35197436493934345, -21306940744773385}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7ffd22e9da58, 0x7fe67f175190}, data = {prev = 0x0, cleanup = 0x0, canceltype = 585751128}}}
        not_first_call = <optimized out>
#7  0x0000562f5f973a3e in _start () at ../../../../render/picture.c:653