> From: Amai Kinono <amaikinono@gmail.com>
> Date: Wed, 18 Aug 2021 20:05:10 +0800
> Cc: 44448@debbugs.gnu.org
>
> Thanks. Now the chance of the bug becomes very low, but I managed to get another backtrace. I think we
> are close to the end.
>
> Thread 1 "emacs" hit Breakpoint 1, signal_or_quit (error_symbol=..., data=..., keyboard_quit=false) at
> eval.c:1793
> 1793 {
> #0  signal_or_quit (error_symbol=..., data=..., keyboard_quit=false) at eval.c:1793
> #1  0x0000560d8c635853 in quit () at eval.c:1783
> #2  0x0000560d8c635731 in process_quit_flag () at eval.c:1730
> #3  0x0000560d8c63577d in maybe_quit () at eval.c:1750
> #4  0x0000560d8c64aff7 in internal_equal (o1=..., o2=..., equal_kind=EQUAL_PLAIN, depth=0, ht=...) at
> fns.c:2591
> #5  0x0000560d8c64a8e6 in Fequal (o1=..., o2=...) at fns.c:2500
> #6  0x0000560d8c711c0d in search_image_cache (f=0x560d8d870a78, spec=...,
> hash=4330934697943008934, foreground=15457202, background=1908769, font_size=20,
> font_family=0x560d8d81e1e8 "DejaVu Sans Mono", ignore_colors=false) at image.c:1623
> #7  0x0000560d8c713b6a in lookup_image (f=0x560d8d870a78, spec=..., face_id=18) at image.c:2450
> #8  0x0000560d8c3e60ea in handle_single_display_spec (it=0x7ffeb78b4820, spec=..., object=...,
> overlay=..., position=0x7ffeb78b4970, bufpos=0, display_replaced=0, frame_window_p=true,
> enable_eval_p=true) at xdisp.c:5791
> #9  0x0000560d8c3e380f in handle_display_spec (it=0x7ffeb78b4820, spec=..., object=..., overlay=...,
> position=0x7ffeb78b4970, bufpos=0, frame_window_p=true) at xdisp.c:5278
> #10 0x0000560d8c3e3001 in handle_display_prop (it=0x7ffeb78b4820) at xdisp.c:5187
> #11 0x0000560d8c3df423 in handle_stop (it=0x7ffeb78b4820) at xdisp.c:3854
> #12 0x0000560d8c3ee685 in next_element_from_string (it=0x7ffeb78b4820) at xdisp.c:8524
> #13 0x0000560d8c3ebab6 in get_next_display_element (it=0x7ffeb78b4820) at xdisp.c:7500
> #14 0x0000560d8c42f88f in display_string (string=0x0, lisp_string=..., face_string=..., face_string_pos=0,
> start=0, it=0x7ffeb78b4820, field_width=0, precision=11, max_x=300, multibyte=0) at xdisp.c:27323
> #15 0x0000560d8c42bd6d in display_mode_element (it=0x7ffeb78b4820, depth=4, field_width=-23,
> precision=-23, elt=..., props=..., risky=false) at xdisp.c:25901

Thanks, plugged this one.