GNU bug report logs - #78654
NS Emacs crashing (since stipples?)

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Message #11 received at 78654 <at> debbugs.gnu.org (full text, mbox):

From: Ship Mints <shipmints <at> gmail.com>
To: 78654 <at> debbugs.gnu.org
Cc: ben <at> bensimms.moe
Subject: Re: bug#78654: NS Emacs crashing (since stipples?)
Date: Sat, 31 May 2025 18:00:20 -0400

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On Sat, May 31, 2025 at 5:53 PM Ship Mints <shipmints <at> gmail.com> wrote:

> On Sat, May 31, 2025 at 5:47 PM Ship Mints <shipmints <at> gmail.com> wrote:
>
>> I'm thinking it might have been this (I cc'd Ben)
>> commit 9cbbdcee132588a11dc03c3da371176aaa13927c it's the only one that
>> looks relevant.  That said, it is possible I'm tickling a bug that's been
>> there longer.
>>
>> I pulled a master today and recompiled from clean and it still happens.
>> It's a bit spurious, but regular over the last few days.  There are no
>> stipples used in the buffer in question, so this looks like a side effect
>> of that change, I'm guessing.  There are specified spaces in the body of
>> the buffer and also in the header-line that are "stretch" glyphs.
>>
>> This comes up as I go through a battery of tests for the revised vtable
>> that has image content in a test jig and with multiple vtables sharing the
>> same buffer (I doubt that has any bearing).
>>
>> I will try to see if I can reproduce without images if that indicates
>> anything.
>>
>> $ uname -a
>>
>> Darwin host.local 21.6.0 Darwin Kernel Version 21.6.0: Mon Jun 24
>> 00:56:10 PDT 2024; root:xnu-8020.240.18.709.2~1/RELEASE_X86_64 x86_64
>>
>> * thread #1, queue = 'com.apple.main-thread', stop reason =
>> EXC_BAD_ACCESS (code=1, address=0xa8)
>>   * frame #0: 0x00000001000e79bb
>> emacs`prepare_face_for_display(f=0x0000000102f41b70,
>> face=0x0000000000000000) at xfaces.c:4657:16 [opt]
>>     frame #1: 0x000000010025d599
>> emacs`ns_draw_stretch_glyph_string(s=0x00007ff7bfef9eb0) at nsterm.m:4176:8
>> [opt]
>>     frame #2: 0x000000010025a532
>> emacs`ns_draw_glyph_string(s=0x00007ff7bfef9eb0) at nsterm.m:4571:7 [opt]
>>     frame #3: 0x000000010004bab4 emacs`draw_glyphs(w=0x0000000112f01140,
>> x=917, row=<unavailable>, area=TEXT_AREA, start=<unavailable>,
>> end=<unavailable>, hl=DRAW_CURSOR, overlaps=0) at xdisp.c:31666:5 [opt]
>>     frame #4: 0x00000001000501d1
>> emacs`draw_phys_cursor_glyph(w=0x0000000112f01140, row=0x0000000181f1e100,
>> hl=DRAW_CURSOR) at xdisp.c:34369:12 [opt]
>>     frame #5: 0x000000010025c091
>> emacs`ns_draw_window_cursor(w=0x0000000112f01140,
>> glyph_row=0x0000000181f1e100, x=<unavailable>, y=<unavailable>,
>> cursor_type=<unavailable>, cursor_width=<unavailable>, on_p=<unavailable>,
>> active_p=true) at nsterm.m:3126:7 [opt]
>>     frame #6: 0x0000000100050d78
>> emacs`display_and_set_cursor(w=0x0000000112f01140, on=true, hpos=0, vpos=1,
>> x=0, y=21) at xdisp.c:34637:5 [opt]
>>     frame #7: 0x000000010000b71b
>> emacs`gui_update_window_end(w=0x0000000112f01140, cursor_on_p=true,
>> mouse_face_overwritten_p=true) at dispnew.c:4653:2 [opt]
>>     frame #8: 0x000000010000a931 emacs`update_window(w=<unavailable>) at
>> dispnew.c:4587:3 [opt]
>>     frame #9: 0x000000010000effc
>> emacs`update_window_tree(w=0x0000000112f01140) at dispnew.c:4234:2 [opt]
>>     frame #10: 0x000000010000efbe
>> emacs`update_window_tree(w=0x0000000113224260) at dispnew.c:4232:2 [opt]
>>     frame #11: 0x0000000100009257 emacs`update_frame [inlined]
>> update_window_frame(f=0x0000000102f41b70) at dispnew.c:3866:3 [opt]
>>     frame #12: 0x00000001000091e3
>> emacs`update_frame(f=0x0000000102f41b70, inhibit_scrolling=<unavailable>)
>> at dispnew.c:4118:5 [opt]
>>     frame #13: 0x0000000100037573 emacs`redisplay_internal at
>> xdisp.c:17736:5 [opt]
>>     frame #14: 0x000000010003d0b6
>> emacs`redisplay_preserve_echo_area(from_where=9) at xdisp.c:18001:5 [opt]
>>     frame #15: 0x00000001001eed97
>> emacs`wait_reading_process_output(time_limit=<unavailable>, nsecs=0,
>> read_kbd=<unavailable>, do_display=true, wait_for_cell=0x0000000000000000,
>> wait_proc=0x0000000000000000, just_wait_proc=0) at process.c:5457:3 [opt]
>>     frame #16: 0x000000010000ca35 emacs`sit_for(timeout=<unavailable>,
>> reading=true, display_option=1) at dispnew.c:6979:7 [opt]
>>     frame #17: 0x00000001000fefd1 emacs`read_char(commandflag=1,
>> map=0x000000010f3b77c3, prev_event=0x0000000000000000,
>> used_mouse_menu=0x00007ff7bfefc46f, end_time=0x0000000000000000) at
>> keyboard.c:2925:11 [opt]
>>     frame #18: 0x00000001000fb4b4
>> emacs`read_key_sequence(keybuf=0x00007ff7bfefc560, prompt=<unavailable>,
>> dont_downcase_last=false, can_return_switch_frame=true,
>> fix_current_buffer=true, prevent_redisplay=<unavailable>,
>> disable_text_conversion_p=<unavailable>) at keyboard.c:10848:12 [opt]
>>     frame #19: 0x00000001000f9529 emacs`command_loop_1 at
>> keyboard.c:1424:15 [opt]
>>     frame #20: 0x000000010019197b
>> emacs`internal_condition_case(bfun=(emacs`command_loop_1 at
>> keyboard.c:1319), handlers=0x0000000000000090, hfun=(emacs`cmd_error at
>> keyboard.c:965)) at eval.c:1684:25 [opt]
>>     frame #21: 0x00000001000f915e
>> emacs`command_loop_2(handlers=0x0000000000000090) at keyboard.c:1163:11
>> [opt]
>>     frame #22: 0x0000000100190e4f
>> emacs`internal_catch(tag=0x0000000000011ac0, func=(emacs`command_loop_2 at
>> keyboard.c:1159), arg=0x0000000000000090) at eval.c:1364:25 [opt]
>>     frame #23: 0x0000000100288a58 emacs`command_loop.cold.1 at
>> keyboard.c:1141:2 [opt]
>>     frame #24: 0x00000001000f89d4 emacs`command_loop at keyboard.c:1138:5
>> [opt]
>>     frame #25: 0x00000001000f889f emacs`recursive_edit_1 at
>> keyboard.c:749:9 [opt]
>>     frame #26: 0x00000001000f8b40 emacs`Frecursive_edit at
>> keyboard.c:832:3 [opt]
>>     frame #27: 0x00000001000f79dd emacs`main(argc=<unavailable>,
>> argv=0x00007ff7bfefcae0) at emacs.c:2582:3 [opt]
>>     frame #28: 0x00000001004d152e dyld`start + 462
>>
>
> Same result without images so it's not that.  I'll see if I can narrow
> this down more.
>

Adding the line in question, according to lldb (this is not a debug build,
I guess I'll rebuild with debug next):

* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
(code=1, address=0xa8)

    frame #0: 0x00000001000e79bb
emacs`prepare_face_for_display(f=0x0000000103566770,
face=0x0000000000000000) at xfaces.c:4657:16 [opt]

   4654

   4655   eassert (FRAME_WINDOW_P (f));

   4656

-> 4657   if (face->gc == 0)

   4658     {

   4659       mask = GCForeground | GCBackground | GCGraphicsExposures;

   4660

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