mu4e mark delete action freezes emacs

[amosbird]

Expected or desired behavior

no freezing

Actual behavior

emacs freezes for about 20 seconds. Here is the full stack trace of emacs when it's freezing,

#0  0x00007fb5617a27bf in __strchr_sse2 () at /usr/lib/libc.so.6
#1  0x00007fb5631a317e in  () at /usr/lib/libfontconfig.so.1
#2  0x00007fb5631a34df in  () at /usr/lib/libfontconfig.so.1
#3  0x00007fb56318d4b5 in  () at /usr/lib/libfontconfig.so.1
#4  0x00007fb56319b3c5 in  () at /usr/lib/libfontconfig.so.1
#5  0x00007fb56319b559 in FcFontSetList () at /usr/lib/libfontconfig.so.1
#6  0x00007fb56319be0d in FcFontList () at /usr/lib/libfontconfig.so.1
#7  0x00000000005bc45c in ftfont_lookup_cache (key=<optimized out>, cache_for=cache_for@entry=
    FTFONT_CACHE_FOR_CHARSET) at ftfont.c:419
#8  0x00000000005be70d in ftfont_get_fc_charset (entity=<optimized out>) at ftfont.c:448
#9  0x00000000005be70d in ftfont_has_char (font=<optimized out>, c=10060) at ftfont.c:1281
#10 0x00000000005747c2 in font_sort_entities (list=<optimized out>, prefer=13213549, f=f@entry=0x548c960, best_only=best_only@entry=10060) at font.c:2290
#11 0x0000000000574d5a in font_select_entity (c=10060, pixel_size=<optimized out>, attrs=0x4e43ff0, entities=<optimized out>, f=0x548c960) at font.c:3127
#12 0x0000000000574d5a in font_find_for_lface (f=f@entry=0x548c960, attrs=attrs@entry=0x4e43ff0, spec=<optimized out>, c=c@entry=10060) at font.c:3267
#13 0x00000000005c426d in fontset_find_font (fontset=<optimized out>, c=c@entry=10060, face=face@entry=0x4e43ff0, charset_id=charset_id@entry=-1, fallback=fallback@entry=false) at fontset.c:698
#14 0x00000000005c4582 in fontset_font (fontset=fontset@entry=197445637, c=c@entry=10060, face=face@entry=0x4e43ff0, id=-1) at fontset.c:776
#15 0x00000000005c5052 in face_for_char (f=0x548c960, face=face@entry=0x4e43ff0, c=10060, pos=<optimized out>, object=<optimized out>) at fontset.c:990
#16 0x0000000000442860 in FACE_FOR_CHAR (object=<optimized out>, pos=<optimized out>, character=<optimized out>, face=0x4e43ff0, f=<optimized out>) at dispextern.h:1850
#17 0x0000000000442860 in get_next_display_element (it=it@entry=0x7ffd33639f90) at xdisp.c:7196
#18 0x000000000044d928 in display_line (it=it@entry=0x7ffd33639f90) at xdisp.c:20704
#19 0x00000000004505c0 in try_window (window=window@entry=114521925, pos=..., flags=flags@entry=1) at xdisp.c:17373
#20 0x0000000000463fef in redisplay_window (window=114521925, just_this_one_p=just_this_one_p@entry=true)
    at xdisp.c:16821
#21 0x000000000046728e in redisplay_window_1 (window=window@entry=114521925) at xdisp.c:14590
#22 0x000000000055d4d6 in internal_condition_case_1 (bfun=bfun@entry=0x467260 <redisplay_window_1>, arg=114521925, handlers=<optimized out>, hfun=hfun@entry=0x42cb80 <redisplay_window_error>) at eval.c:1348
#23 0x0000000000454adf in redisplay_internal () at xdisp.c:14162
#24 0x0000000000456025 in redisplay () at xdisp.c:13296
#25 0x00000000004f6c5b in read_char (commandflag=commandflag@entry=1, map=map@entry=197471971, prev_event=0, used_mouse_menu=used_mouse_menu@entry=0x7ffd3363f31b, end_time=end_time@entry=0x0) at keyboard.c:2482
#26 0x00000000004f96df in read_key_sequence (keybuf=keybuf@entry=0x7ffd3363f3f0, prompt=prompt@entry=0, dont_downcase_last=dont_downcase_last@entry=false, can_return_switch_frame=can_return_switch_frame@entry=true, fix_current_buffer=fix_current_buffer@entry=true, prevent_redisplay=prevent_redisplay@entry=false, bufsize=30) at keyboard.c:9109
#27 0x00000000004fb266 in command_loop_1 () at keyboard.c:1370
#28 0x000000000055d43e in internal_condition_case (bfun=bfun@entry=0x4fb060 <command_loop_1>, handlers=handlers@entry=19728, hfun=hfun@entry=0x4f22b0 <cmd_error>) at eval.c:1324
#29 0x00000000004ecf7c in command_loop_2 (ignore=ignore@entry=0) at keyboard.c:1112
#30 0x000000000055d3dc in internal_catch (tag=tag@entry=47184, func=func@entry=0x4ecf60 <command_loop_2>, arg=arg@entry=0) at eval.c:1091
#31 0x00000000004ecf39 in command_loop () at keyboard.c:1091
#32 0x00000000004f1eb3 in recursive_edit_1 () at keyboard.c:697
#33 0x00000000004f21eb in Frecursive_edit () at keyboard.c:768
#34 0x000000000041902c in main (argc=<optimized out>, argv=0x7ffd3363f768) at emacs.c:1688

This happens only at the first time calling mu4e-headers-mark-for-delete. Other mark actions don't have this problem. I feel it may be related to the mark symbol. Emacs also freezes when the first time I open mu4e-mark.el and see this unicode mark ❌ . So this may not technically be mu4e's problem. But anyway, I only encountered this issue using this package 😃

Steps to reproduce

Open emacs, call mu4e, call mu4e-headers-mark-for-delete .

Versions of mu, mu4e/emacs, operating system etc.

mu, 0.9.19
emacs, 26.0.50.6
archlinux

[djcb]

Yeah, this seems like an emacs issue, please try M-x report-emacs-bug, thanks!