(gdb) bt
#0  rxvt_font_xft::load (this=0x55555578db80, prop=..., force_prop=false)
    at /home/exg/dev-src/rxvt-unicode/src/rxvtfont.C:1317
#1  0x0000555555578928 in rxvt_fontset::realize_font (this=0x555555760fd0, i=32)
    at /home/exg/dev-src/rxvt-unicode/src/rxvtfont.C:1756
#2  0x0000555555578ba1 in rxvt_fontset::find_font_idx (this=0x555555760fd0, unicode=31725)
    at /home/exg/dev-src/rxvt-unicode/src/rxvtfont.C:1815
#3  0x000055555558e01c in rxvt_fontset::find_font (this=0x555555760fd0, unicode=31725)
    at /home/exg/dev-src/rxvt-unicode/src/rxvtfont.h:101
#4  0x000055555558605f in rxvt_term::scr_add_lines (this=0x5555556b03e0,
    str=0x7fffffffbce4 L"\r\nntf '\\e]50;\\a\\xe7\\xaf\\xad'debug/src", ' ' <repeats 73 times>, "\r \r\xffffbf38翿\xffffbf34翿", len=1, minlines=0) at /home/exg/dev-src/rxvt-unicode/src/screen.C:940
#5  0x000055555556ffa8 in rxvt_term::cmd_parse (this=0x5555556b03e0)
    at /home/exg/dev-src/rxvt-unicode/src/command.C:2340
#6  0x000055555556d972 in rxvt_term::pty_cb (this=0x5555556b03e0, w=..., revents=1)
    at /home/exg/dev-src/rxvt-unicode/src/command.C:1237
#7  0x0000555555581e2e in ev::base<ev_io, ev::io>::method_thunk<rxvt_term, &rxvt_term::pty_cb> (
    w=0x5555556bb628, revents=1) at /home/exg/dev-src/rxvt-unicode/src/../libev/ev++.h:498
#8  0x00005555555a2b16 in ev_invoke_pending () at /home/exg/dev-src/rxvt-unicode/src/../libev/ev.c:3774
#9  0x00005555555a341f in ev_run (flags=0) at /home/exg/dev-src/rxvt-unicode/src/../libev/ev.c:4198
#10 0x000055555556b76c in main (argc=1, argv=0x7fffffffdf48) at /home/exg/dev-src/rxvt-unicode/src/rxvt.C:38
(gdb) p *this
$1 = {<rxvt_font> = {_vptr.rxvt_font = 0x5555556775f0 <vtable for rxvt_font_xft+16>, term = 0x5555556b03e0,
    name = 0x55555577a2a0 ":slant=0:weight=100:pixelsize=1:antialias=False:minspace=True:lang=ja",
    cs = CS_JIS0208_1990_0, loaded = true, ascent = 2, descent = 1, width = 1, height = 3}, f = 0x7ffff70be010}
(gdb) p prop
$2 = (const rxvt_fontprop &) @0x555555760fe0: {width = 1, height = 1, ascent = -1, weight = 100, slant = 0}