Created attachment 141024 [details]
Program to reproduce the bug

Program to reproduce the bug is attached. OK1 is printed, OK2 is not.

$ gcc xftbug.c -lX11 -lXft -I /usr/include/freetype2 -lfontconfig
$ XFT_DEBUG=1 ./a.out
XFT_DEBUG=1
XftFontOpenName "Noto Color Emoji": Pattern has 1 elts (size 16)
        family: "Noto Color Emoji"(s)

Match Pattern has 44 elts (size 48)
        family: "Noto Color Emoji"(s)
        familylang: "en"(s)
        style: "Regular"(s)
        stylelang: "en"(s)
        fullname: "Noto Color Emoji"(s)
        fullnamelang: "en"(s)
        slant: 0(i)(s)
        weight: 80(i)(s)
        width: 100(i)(s)
        size: 81.6213(f)(w)
        pixelsize: 109(f)(s)
        foundry: "GOOG"(w)
        antialias: False(s)
        hintstyle: 1(i)(w)
        hinting: True(s)
        verticallayout: False(s)
        autohint: False(s)
        globaladvance: True(s)
        file: "/usr/share/fonts/truetype/noto/NotoColorEmoji.ttf"(w)
        index: 0(i)(w)
        outline: False(w)
        scalable: True(w)
        dpi: 96.1514(f)(s)
        rgba: 0(i)(s)
        scale: 1(f)(s)
        minspace: False(s)
        matrix: [0.147021 0; 0 0.147021](w)
        charset:
        0000: 00002001 03ff0409 00000000 00000000 00000000 00004200 00000000 00000000
        0020: 00002000 10000000 00000200 00000000 00000000 00000000 00000000 00000008
        0021: 00000000 02000004 00000000 00000000 03f00000 00000600 00000000 00000000
        0023: 0c000000 00000100 00000000 00000000 00000000 00000000 00008000 070ffe00
        0024: 00000000 00000000 00000000 00000000 00000000 00000000 00000004 00000000
        0025: 00000000 00000000 00000000 00000000 00000000 00400c00 00000001 78000000
        0026: 2132401f 0700c44d 000fff05 88000169 1afc0000 60030c03 001ac130 27bf0600
        0027: 2054bf24 00180102 00b85090 00000018 00e00000 80010002 00000000 00000000
        0029: 00000000 00300000 00000000 00000000 00000000 00000000 00000000 00000000
        002b: 180000e0 00000000 00210000 00000000 00000000 00000000 00000000 00000000
        0030: 00000000 20010000 00000000 00000000 00000000 00000000 00000000 00000000
        0032: 00000000 00000000 00000000 00000000 02800000 00000000 00000000 00000000
        01f0: 00000010 00000000 00000000 00000000 00000000 00000000 00008000 00000000
        01f1: 00000000 00000000 00000000 c0030000 07fe4000 00000000 00000000 ffffffc0
        01f2: 04000006 07fc8000 00030000 00000000 00000000 00000000 00000000 00000000
        01f3: ffffffff fffffff3 ffffffff ffffffff cecfffff ffffffff ffffffff ffb9ffff
        01f4: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff bfffffff
        01f5: ffffffff 3fffffff ffff7e00 07f980ff 00613c80 10060130 700e001c fc08810a
        01f6: ffffffff ffffffff 0000ffff 00000000 ffffffff ffffffff 0007f83f 01f91a3f
        01f9: ffff0000 77ffffff ffff1fbf 00000fff 00ffffff 00000000 ffff0001 0000007f
        0e00: 00000000 03ff0000 00000000 87fffffe 00000000 00000000 00000000 00000000
        0fe4: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00007fe0
        0fe8: 00000000 00ffd000 00000000 00000000 00000000 00000000 00000000 00000000
(w)
        lang: und-zsye(s)
        fontversion: 131793(i)(s)
        capability: "otlayout:DFLT"(w)
        fontformat: "TrueType"(w)
        embolden: False(s)
        embeddedbitmap: True(s)
        decorative: False(s)
        lcdfilter: 1(i)(w)
        namelang: "en"(s)
        prgname: "a.out"(s)
        postscriptname: "NotoColorEmoji"(w)
        color: True(s)
        symbol: False(s)
        pixelsizefixupfactor: 0.147021(f)(w)
        render: True(s)
        maxglyphmemory: 1048576(i)(s)

XftFontInfoFill: /usr/share/fonts/truetype/noto/NotoColorEmoji.ttf: 0 (109 pixels)
OK1
X Error of failed request:  BadLength (poly request too large or internal Xlib length error)
  Major opcode of failed request:  139 (RENDER)
  Minor opcode of failed request:  20 (RenderAddGlyphs)
  Serial number of failed request:  11
  Current serial number in output stream:  12