GNU logs - #79193, boring messages

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Subject: bug#79193: 31.0.50; feature/igc: crashes with no gui frame
Resent-From: john muhl <jm@HIDDEN>
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Date: Thu, 07 Aug 2025 12:09:19 -0500
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Recently (since a0757e0ac05) Emacs has been crashing regularly when
running with only tty frames. It could be a coincidence but keeping a
gui frame around has let me run crash free for days, then I get rid of
that frame and within a couple of hours at most Emacs crashes.

I haven=E2=80=99t been able to find a recipe that reliably crashes but hit =
them
in various everyday usage like C-n in a dired buffer, C-xb otherbuf TAB,
C/M-v, etc. This latest crash was after pressing SPC in a gnus summary
buffer to go the next unread article.

I still have the crashed session attached to gdb around if there is
anything else that would help.

(gdb) bt full
#0  terminate_due_to_signal (sig=3D11, backtrace_limit=3D40) at emacs.c:444
No locals.
#1  0x000055555589a228 in handle_fatal_signal (sig=3D11) at sysdep.c:1793
No locals.
#2  0x000055555589a2b2 in deliver_thread_signal (sig=3D11, handler=3D0x5555=
5589a210 <handle_fatal_signal>) at sysdep.c:1785
        old_errno =3D 2
#3  0x00005555558959ea in deliver_fatal_thread_signal (sig=3D11) at sysdep.=
c:1805
No locals.
#4  0x000055555589a342 in handle_sigsegv (sig=3D11, siginfo=3D0x555555bfb7f=
0 <sigsegv_stack+62928>, arg=3D0x555555bfb6c0 <sigsegv_stack+62624>) at sys=
dep.c:1943
        fatal =3D false
#5  <signal handler called>
No locals.
#6  0x00007ffff57d0327 in __GI_kill () at ../sysdeps/unix/syscall-template.=
S:120
No locals.
#7  0x0000555555b5f0f9 in sigHandle ()
No symbol table info available.
#8  <signal handler called>
No locals.
#9  0x00005555556ca07a in line_hash_code (f=3D0x7fff43aae670, row=3D0x55555=
6059240) at dispnew.c:1196
        c =3D 32
        face_id =3D 0
        glyph =3D 0x55556d380850
        end =3D 0x55556d3820d0
        hash =3D 0
#10 0x00005555556c83f2 in scrolling (frame=3D0x7fff43aae670) at dispnew.c:5=
827
        unchanged_at_top =3D 0
        unchanged_at_bottom =3D 45
        window_size =3D 0
        changed_lines =3D 0
        i =3D 0
        height =3D 45
        free_at_end_vpos =3D 45
        current_matrix =3D 0x55555632fe30
        desired_matrix =3D 0x555555ccc520
        old_hash =3D 0x7fffffff95d0
        sa_avail =3D 15664
        sa_count =3D {
          bytes =3D 192
        }
        new_hash =3D 0x7fffffff9684
        draw_cost =3D 0x7fffffff9738
        old_draw_cost =3D 0x7fffffff97ec
#11 0x00005555556b9749 in write_matrix (f=3D0x7fff43aae670, inhibit_id_p=3D=
false, updating_menu_p=3Dfalse) at dispnew.c:5772
        first_row =3D 0
        last_row =3D 21845
#12 0x00005555556b906d in combine_updates_for_frame (f=3D0x7fff43aae670, in=
hibit_scrolling=3Dfalse) at dispnew.c:4085
        root =3D 0x7fff43aae670
        z_order =3D {
          i =3D 0x7fff44c58d0b
        }
        topmost_child =3D 0x0
#13 0x00005555556ba424 in combine_updates (roots=3D...) at dispnew.c:4135
        root =3D 0x7fff43aae670
#14 0x000055555570f6f6 in redisplay_internal () at xdisp.c:17807
        tty_root_frames =3D {
          i =3D 0x7fff44c4d4cb
        }
        MAX_HSCROLL_RETRIES =3D MAX_HSCROLL_RETRIES
        MAX_GARBAGED_FRAME_RETRIES =3D MAX_GARBAGED_FRAME_RETRIES
        w =3D 0x7fff467b0748
        sw =3D 0x7fff467b0748
        fr =3D 0x7fff4399e000
        must_finish =3D true
        match_p =3D true
        tlbufpos =3D {
          charpos =3D 6192,
          bytepos =3D 6197
        }
        tlendpos =3D {
          charpos =3D 0,
          bytepos =3D 0
        }
        number_of_visible_frames =3D 2
        sf =3D 0x7fff4399e000
        polling_stopped_here =3D true
        tail =3D {
          i =3D 0x0
        }
        frame =3D {
          i =3D 0x7fff43aae675
        }
        hscroll_retries =3D 0
        garbaged_frame_retries =3D 0
        consider_all_windows_p =3D true
        update_miniwindow_p =3D true
        count =3D {
          bytes =3D 96
        }
        previous_frame =3D 0x7fff4399e000
        current_matrices_cleared =3D false
        new_count =3D 32767
#15 0x00005555557179b9 in redisplay () at xdisp.c:16850
No locals.
#16 0x000055555585d1d0 in read_char (commandflag=3D1, map=3D..., prev_event=
=3D..., used_mouse_menu=3D0x7fffffffd4df, end_time=3D0x0) at keyboard.c:2689
        echo_current =3D true
        c =3D {
          i =3D 0x0
        }
        local_getcjmp =3D {{
            __jmpbuf =3D {55832, 0, 160, 55832, 93824999301240, 55832, 5583=
2, 55832},
            __mask_was_saved =3D 55832,
            __saved_mask =3D {
              __val =3D {55832, 140737488342704, 93824995580517, 0, 192, 14=
0734347075432, 140734347075435, 160, 445, 118, 563, 6, 557, 2, 140734576048=
900, 1030}
            }
          }}
        save_jump =3D {{
            __jmpbuf =3D {14323566176, 24, 140737488342304, 93824997369764,=
 59136, 12884901912, 140734347075432, 140734347075435},
            __mask_was_saved =3D -12976,
            __saved_mask =3D {
              __val =3D {93824997369689, 140734347075432, 140734347075411, =
55832, 140734347075435, 140737488342400, 93824996183549, 96, 14073434707541=
1, 55832, 140734347075435, 140737488342704, 93824995566605, 0, 140734576049=
085, 56}
            }
          }}
        tem =3D {
          i =3D 0x7fffe8001a00
        }
        save =3D {
          i =3D 0x7fff44c3df68
        }
        previous_echo_area_message =3D {
          i =3D 0x0
        }
        also_record =3D {
          i =3D 0x0
        }
        reread =3D false
        recorded =3D false
        polling_stopped_here =3D false
        orig_kboard =3D 0x555556c4a1b0
        jmpcount =3D {
          bytes =3D 1
        }
        c_volatile =3D {
          i =3D 0x38
        }
#17 0x0000555555859b1a in read_key_sequence (keybuf=3D0x7fffffffd9f0, promp=
t=3D..., dont_downcase_last=3Dfalse, can_return_switch_frame=3Dtrue, fix_cu=
rrent_buffer=3Dtrue, prevent_redisplay=3Dfalse, disable_text_conversion_p=
=3Dfalse) at keyboard.c:11197
        interrupted_kboard =3D 0x555556c4a1b0
        interrupted_frame =3D 0x7fff4399e000
        key =3D {
          i =3D 0x7d2
        }
        used_mouse_menu =3D false
        echo_local_start =3D 0
        last_real_key_start =3D 0
        keys_local_start =3D 0
        new_binding =3D {
          i =3D 0x0
        }
        count =3D {
          bytes =3D 96
        }
        t =3D 0
        echo_start =3D 0
        keys_start =3D 0
        current_binding =3D {
          i =3D 0x7fff44c3df6b
        }
        first_unbound =3D 31
        mock_input =3D 0
        used_mouse_menu_history =3D {false <repeats 30 times>}
        fkey =3D {
          parent =3D {
            i =3D 0x7fff439da8ab
          },
          map =3D {
            i =3D 0x7fff439da8ab
          },
          start =3D 0,
          end =3D 0
        }
        keytran =3D {
          parent =3D {
            i =3D 0x7fff4398eeab
          },
          map =3D {
            i =3D 0x7fff4398eeab
          },
          start =3D 0,
          end =3D 0
        }
        indec =3D {
          parent =3D {
            i =3D 0x7fff439da893
          },
          map =3D {
            i =3D 0x7fff439da893
          },
          start =3D 0,
          end =3D 0
        }
        shift_translated =3D false
        delayed_switch_frame =3D {
          i =3D 0x0
        }
        original_uppercase =3D {
          i =3D 0x0
        }
        original_uppercase_position =3D -1
        starting_buffer =3D 0x7fff46678f50
        fake_prefixed_keys =3D {
          i =3D 0x0
        }
        first_event =3D {
          i =3D 0x0
        }
        second_event =3D {
          i =3D 0x0
        }
#18 0x00005555558577a6 in command_loop_1 () at keyboard.c:1441
        keybuf =3D {{
            i =3D 0x82
          }, {
            i =3D 0x555555958162 <builtin_lisp_symbol+34>
          }, {
            i =3D 0x56069dd0
          }, {
            i =3D 0x0
          }, {
            i =3D 0x7fffffffda90
          }, {
            i =3D 0x555555958bd1 <unbind_to+305>
          }, {
            i =3D 0x0
          }, {
            i =3D 0x0
          }, {
            i =3D 0x555556069e30
          }, {
            i =3D 0x0
          }, {
            i =3D 0x0
          }, {
            i =3D 0xc
          }, {
            i =3D 0x13e80
          }, {
            i =3D 0x38
          }, {
            i =3D 0x7fff46678f55
          }, {
            i =3D 0x0
          }, {
            i =3D 0x0
          }, {
            i =3D 0x0
          }, {
            i =3D 0x60
          }, {
            i =3D 0x0
          }, {
            i =3D 0x7fffffffdbf0
          }, {
            i =3D 0x555555858ca3 <cmd_error+915>
          }, {
            i =3D 0x555556c4a1b0
          }, {
            i =3D 0x555556c4a1b0
          }, {
            i =3D 0x56069dd0
          }, {
            i =3D 0x7fff44a6ed68
          }, {
            i =3D 0x0
          }, {
            i =3D 0x0
          }, {
            i =3D 0x0
          }, {
            i =3D 0x0
          }}
        i =3D 1
        last_pt =3D 6192
        cmd =3D {
          i =3D 0x2aa9edeab5a8
        }
        prev_modiff =3D 8343
        prev_buffer =3D 0x7fff46678f50
#19 0x000055555595ebd1 in internal_condition_case (bfun=3D0x5555558571c0 <c=
ommand_loop_1>, handlers=3D..., hfun=3D0x555555858910 <cmd_error>) at eval.=
c:1713
        val =3D {
          i =3D 0x0
        }
        c =3D 0x555555cc74b0
#20 0x0000555555857173 in command_loop_2 (handlers=3D...) at keyboard.c:1180
        val =3D {
          i =3D 0x2
        }
#21 0x000055555595dc6f in internal_catch (tag=3D..., func=3D0x555555857150 =
<command_loop_2>, arg=3D...) at eval.c:1393
        val =3D {
          i =3D 0xa8
        }
        c =3D 0x555555cc7320
#22 0x000055555585638e in command_loop () at keyboard.c:1158
No locals.
#23 0x0000555555856160 in recursive_edit_1 () at keyboard.c:766
        count =3D {
          bytes =3D 32
        }
        val =3D {
          i =3D 0x55555595e141 <record_unwind_protect+129>
        }
#24 0x00005555558566af in Frecursive_edit () at keyboard.c:849
        count =3D {
          bytes =3D 0
        }
        buffer =3D {
          i =3D 0x0
        }
#25 0x00005555558529dc in main (argc=3D1, argv=3D0x7fffffffe248) at emacs.c=
:2651
        stack_bottom_variable =3D 0x555555c7d560
        old_argc =3D 1
        dump_file =3D 0x0
        no_loadup =3D false
        junk =3D 0x0
        dname_arg =3D 0x0
        ch_to_dir =3D 0x0
        original_pwd =3D 0x0
        dump_mode =3D 0x0
        skip_args =3D 0
        temacs =3D 0x0
        attempt_load_pdump =3D true
        only_version =3D false
        rlim =3D {
          rlim_cur =3D 10022912,
          rlim_max =3D 18446744073709551615
        }
        lc_all =3D 0x0
        sockfd =3D -1
        module_assertions =3D false

Lisp Backtrace:
"redisplay_internal (C function)" (0x0)

In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.49, cairo version 1.18.4) of 2025-08-03 built on nano
Repository revision: 92f52805f9e99068ff07148a3a76b1d97e77adbf
Repository branch: feature/igc
System Description: Void Linux

Configured using:
 'configure CC=3Dclang 'CFLAGS=3D-O0 -g3' CPPFLAGS=3D-I/home/jm/opt/mps
 'LDFLAGS=3D-L/home/jm/opt/mps -fuse-ld=3Dlld' --enable-check=3Dyes,glyphs
 --enable-check-lisp-object-type --with-mps --with-pgtk
 --without-native-compilation'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBXML2 MODULES MPS NOTIFY INOTIFY PDUMPER PGTK PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP
XIM GTK3 ZLIB

Important settings:
  value of $LC_COLLATE: C
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  bug-reference-prog-mode: t
  checkdoc-minor-mode: t
  outline-minor-mode: t
  whitespace-mode: t
  flyspell-mode: t
  midnight-mode: t
  kill-ring-deindent-mode: t
  global-paren-face-mode: t
  paren-face-mode: t
  global-kkp-mode: t
  desktop-save-mode: t
  cua-mode: t
  auto-insert-mode: t
  savehist-mode: t
  save-place-mode: t
  repeat-mode: t
  global-auto-revert-mode: t
  electric-pair-mode: t
  delete-selection-mode: t
  minibuffer-electric-default-mode: t
  global-completion-preview-mode: t
  completion-preview-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-quote-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  prettify-symbols-mode: t
  tab-bar-history-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  minibuffer-regexp-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  auto-save-visited-mode: t
  abbrev-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr gnus-msg gnus-art mm-uu mml2015 mm-view mml-smime
smime gnutls dig gnus-sum shr pixel-fill kinsoku url-file svg dom
gnus-group gnus-undo gnus-start gnus-dbus dbus xml gnus-cloud nnimap
nnmail browse-url xdg url url-proxy url-privacy url-expand url-methods
url-history url-cookie generate-lisp-file url-domsuf url-util
mail-source utf7 nnoo parse-time iso8601 gnus-spec gnus-int gnus-range
gnus-win emacsbug message mailcap yank-media puny rfc822 mml mml-sec epa
derived epg rfc6068 epg-config mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045
ietf-drums vc-git diff-mode track-changes files-x vc vc-dispatcher
bug-reference checkdoc lisp-mnt thingatpt noutline outline disp-table
whitespace flyspell ispell auth-source-pass url-parse url-vars
auth-source cl-seq eieio eieio-core cl-macs password-cache json map
server noco-theme unspecified-theme most-faces color time window-x
dired-x dired dired-loaddefs help-at-pt cursor-sensor midnight
indent-aux gnus nnheader gnus-util text-property-search time-date subr-x
mail-utils range mm-util mail-prsvr paren-face kkp term/xterm xterm
byte-opt gv bytecomp byte-compile compat desktop frameset cua-base
autoinsert fennel-mode-autoloads gauge-autoloads gauge
indent-bars-autoloads kkp-autoloads nanoid-autoloads
paren-face-autoloads unspecified-theme-autoloads most-faces-autoloads
xr-autoloads rx blase-theme cl-extra help-mode blase-defaults-theme
savehist saveplace repeat autorevert filenotify elec-pair delsel
easy-mmode blase-completion-theme minibuf-eldef completion-preview
site-start cus-edit pp cus-start cus-load icons wid-edit cl-loaddefs
cl-lib rmc iso-transl tooltip cconv eldoc paren electric uniquify
ediff-hook vc-hooks lisp-float-type elisp-mode mwheel term/pgtk-win
pgtk-win term/common-win touch-screen pgtk-dnd tool-bar dnd fontset
image regexp-opt fringe tabulated-list replace newcomment text-mode
lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch
easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
composite emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo gtk pgtk
lcms2 multi-tty move-toolbar make-network-process tty-child-frames mps
emacs)

Memory information:
((conses 24 0 0) (symbols 56 0 0) (strings 40 0 0) (string-bytes 1 0)
 (vectors 24 0) (vector-slots 8 0 0) (floats 24 0 0)
 (intervals 64 0 0) (buffers 1072 0))

Message sent:

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: john muhl <jm@HIDDEN>
Subject: bug#79193: Acknowledgement (31.0.50; feature/igc: crashes with no
 gui frame)
Message-ID: <handler.79193.B.17545865928462.ack <at> debbugs.gnu.org>
References: <87tt2j83eo.fsf@HIDDEN>
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X-Gnu-PR-Package: emacs
Reply-To: 79193 <at> debbugs.gnu.org
Date: Thu, 07 Aug 2025 17:10:02 +0000

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79193: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D79193
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#79193: 31.0.50; feature/igc: crashes with no gui frame
Resent-From: Pip Cet <pipcet@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-gnu-emacs@HIDDEN
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To: john muhl <jm@HIDDEN>
Cc: Gerd =?UTF-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>, Helmut Eller <eller.helmut@HIDDEN>, 79193 <at> debbugs.gnu.org
Date: Thu, 07 Aug 2025 17:31:23 +0000
From: Pip Cet <pipcet@HIDDEN>
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"john muhl" <jm@HIDDEN> writes:

> I still have the crashed session attached to gdb around if there is
> anything else that would help.

Please keep it around, and also generate a coredump file in case we
accidentally lose it (the gdb command to do that is "gcore")

> (gdb) bt full
> #0  terminate_due_to_signal (sig=3D11, backtrace_limit=3D40) at emacs.c:4=
44
> No locals.
> #1  0x000055555589a228 in handle_fatal_signal (sig=3D11) at sysdep.c:1793
> No locals.
> #2  0x000055555589a2b2 in deliver_thread_signal (sig=3D11, handler=3D0x55=
555589a210 <handle_fatal_signal>) at sysdep.c:1785
>         old_errno =3D 2
> #3  0x00005555558959ea in deliver_fatal_thread_signal (sig=3D11) at sysde=
p.c:1805
> No locals.
> #4  0x000055555589a342 in handle_sigsegv (sig=3D11, siginfo=3D0x555555bfb=
7f0 <sigsegv_stack+62928>, arg=3D0x555555bfb6c0 <sigsegv_stack+62624>) at s=
ysdep.c:1943
>         fatal =3D false
> #5  <signal handler called>
> No locals.
> #6  0x00007ffff57d0327 in __GI_kill () at ../sysdeps/unix/syscall-templat=
e.S:120
> No locals.
> #7  0x0000555555b5f0f9 in sigHandle ()
> No symbol table info available.
> #8  <signal handler called>
> No locals.
> #9  0x00005555556ca07a in line_hash_code (f=3D0x7fff43aae670, row=3D0x555=
556059240) at dispnew.c:1196
>         c =3D 32
>         face_id =3D 0
>         glyph =3D 0x55556d380850
>         end =3D 0x55556d3820d0
>         hash =3D 0

Could you show glyph->frame, f, *glyph->frame, and *f in this stack
frame?

Is it possible we're simply failing to trace glyph->frame in
fix_glyph_matrix? Is there some reason those frames should be pinned,
but might fail to be?

Thanks!

Pip

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Subject: bug#79193: 31.0.50; feature/igc: crashes with no gui frame
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Pip Cet <pipcet@HIDDEN> writes:

> "john muhl" <jm@HIDDEN> writes:

>> (gdb) bt full
>> #0  terminate_due_to_signal (sig=3D11, backtrace_limit=3D40) at emacs.c:=
444
>> No locals.
>> #1  0x000055555589a228 in handle_fatal_signal (sig=3D11) at sysdep.c:179=
3
>> No locals.
>> #2  0x000055555589a2b2 in deliver_thread_signal (sig=3D11, handler=3D0x5=
5555589a210 <handle_fatal_signal>) at sysdep.c:1785
>>         old_errno =3D 2
>> #3  0x00005555558959ea in deliver_fatal_thread_signal (sig=3D11) at sysd=
ep.c:1805
>> No locals.
>> #4  0x000055555589a342 in handle_sigsegv (sig=3D11, siginfo=3D0x555555bf=
b7f0 <sigsegv_stack+62928>, arg=3D0x555555bfb6c0 <sigsegv_stack+62624>) at =
sysdep.c:1943
>>         fatal =3D false
>> #5  <signal handler called>
>> No locals.
>> #6  0x00007ffff57d0327 in __GI_kill () at ../sysdeps/unix/syscall-templa=
te.S:120
>> No locals.
>> #7  0x0000555555b5f0f9 in sigHandle ()
>> No symbol table info available.
>> #8  <signal handler called>
>> No locals.
>> #9  0x00005555556ca07a in line_hash_code (f=3D0x7fff43aae670, row=3D0x55=
5556059240) at dispnew.c:1196
>>         c =3D 32
>>         face_id =3D 0
>>         glyph =3D 0x55556d380850
>>         end =3D 0x55556d3820d0
>>         hash =3D 0
>
> Could you show glyph->frame, f, *glyph->frame, and *f in this stack
> frame?
>
> Is it possible we're simply failing to trace glyph->frame in
> fix_glyph_matrix? Is there some reason those frames should be pinned,
> but might fail to be?

Assuming the answers are "yes" and "no", respectively, I think these two
patches might help:

John, would it be possible for you to keep your current Emacs session
alive in gdb but start a new one with these patches to see whether the
issue still happens?

From 2fb119758582ab202e1691bd14d7545c6cbf948c Mon Sep 17 00:00:00 2001
From: Pip Cet <pipcet@HIDDEN>
Date: Thu, 7 Aug 2025 17:41:14 +0000
Subject: [PATCH 1/2] [MPS] Fix hashing of text terminal lines (bug#79193)

* src/dispnew.c (line_hash_code) [MPS]: Use 'igc_hash', not the
address of a movable object, as a hash value.
---
 src/dispnew.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/dispnew.c b/src/dispnew.c
index 1eaab64d876..755422b7cf1 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -1192,8 +1192,17 @@ line_hash_code (struct frame *f, struct glyph_row *r=
ow)
 =09     index into the frame's face cache), we need the hash
 =09     value to include something specific to the frame, and we
 =09     use the frame cache's address for that purpose.  */
+#ifndef HAVE_MPS
 =09  if (glyph->frame && glyph->frame !=3D f)
 =09    face_id +=3D (uintptr_t) glyph->frame->face_cache;
+#else
+=09  if (glyph->frame && glyph->frame !=3D f)
+=09    {
+=09      Lisp_Object face_cache;
+=09      XSETVECTOR (face_cache, glyph->frame->face_cache);
+=09      face_id +=3D igc_hash (face_cache);
+=09    }
+#endif
 =09  if (FRAME_MUST_WRITE_SPACES (f))
 =09    c -=3D SPACEGLYPH;
 =09  hash =3D (((hash << 4) + (hash >> 24)) & 0x0fffffff) + c;
--=20
2.50.0

From 88bd0327b90ba599a31e5ecbb4eabb36c557f7b8 Mon Sep 17 00:00:00 2001
From: Pip Cet <pipcet@HIDDEN>
Date: Thu, 7 Aug 2025 17:42:29 +0000
Subject: [PATCH 2/2] [MPS] Trace frame pointer in glyphs (bug#79193)

* src/igc.c (fix_glyph_pool):
(fix_glyph_matrix): Trace the ->frame pointer in a glyph structure
when fixing the glyph.
---
 src/igc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/igc.c b/src/igc.c
index 765b6a47fb2..966dcb30ac2 100644
--- a/src/igc.c
+++ b/src/igc.c
@@ -2282,6 +2282,7 @@ fix_glyph_pool (mps_ss_t ss, struct glyph_pool *pool)
     for (ptrdiff_t i =3D 0; i < pool->nglyphs; ++i)
       {
 =09IGC_FIX12_OBJ (ss, &pool->glyphs[i].object);
+=09IGC_FIX12_PVEC (ss, &pool->glyphs[i].frame);
       }
   }
   MPS_SCAN_END (ss);
@@ -2304,7 +2305,10 @@ fix_glyph_matrix (mps_ss_t ss, struct glyph_matrix *=
matrix)
 =09      struct glyph *glyph =3D row->glyphs[area];
 =09      struct glyph *end_glyph =3D glyph + row->used[area];
 =09      for (; glyph < end_glyph; ++glyph)
-=09=09IGC_FIX12_OBJ (ss, &glyph->object);
+=09=09{
+=09=09  IGC_FIX12_OBJ (ss, &glyph->object);
+=09=09  IGC_FIX12_PVEC (ss, &glyph->frame);
+=09=09}
 =09    }
 =09}
     IGC_FIX12_PVEC (ss, &matrix->buffer);
--=20
2.50.0

Of course, this may fail to work because of the glyph pool tracing bug
Helmut discovered; Helmut, do you have a preference for how to fix that?
My preference would be to simply use igc_xzalloc_ambig, but I also have
code here to make glyph pools, and glyph arrays, special IGC object
types.

Thanks!
Pip

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Pip Cet <pipcet@HIDDEN> writes:

> Could you show glyph->frame, f, *glyph->frame, and *f in this stack
> frame?
>
> Is it possible we're simply failing to trace glyph->frame in
> fix_glyph_matrix? 

IIRC, the idea was to not trace the glyph::frame in fix_matrix because
that is not enough in the tty case because not everything is a window in
that case. That lead to fix_glyph_pool and fix_glyph_matrix in the tty
windows could be a nop because window matrices on ttys are sub-allocated
from the pools.

No, for some reason I did

  a19e818265e ; Fix last change

which removed the frame from fix_glyph_pool but left the braces which I
normally dislike if it's only a single statement.

And secondly, I don't check for window-system frames in
fix_glyph_matrix.

And my memory of that is entirely erase at the moment. How weird!
What happened?

> Is there some reason those frames should be pinned, but might fail to
> be?

No, that's not required.

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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> Pip Cet <pipcet@HIDDEN> writes:
>
>> Could you show glyph->frame, f, *glyph->frame, and *f in this stack
>> frame?
>>
>> Is it possible we're simply failing to trace glyph->frame in
>> fix_glyph_matrix?=20
>
> IIRC, the idea was to not trace the glyph::frame in fix_matrix because
> that is not enough in the tty case because not everything is a window in
> that case. That lead to fix_glyph_pool and fix_glyph_matrix in the tty
> windows could be a nop because window matrices on ttys are sub-allocated
> from the pools.
>
> No, for some reason I did
>
>   a19e818265e ; Fix last change
>
> which removed the frame from fix_glyph_pool but left the braces which I
> normally dislike if it's only a single statement.
>
> And secondly, I don't check for window-system frames in
> fix_glyph_matrix.

I take that back, I just did is differently:

igc.c<cl-packages>:
 2365     if (w->current_matrix && !w->current_matrix->pool)
 2366       IGC_FIX_CALL (ss, fix_glyph_matrix (ss, w->current_matrix));

the pool is null on window systems. So that's okay.But the frame is
missing.

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Pip Cet <pipcet@HIDDEN> writes:

> Pip Cet <pipcet@HIDDEN> writes:
>
>> "john muhl" <jm@HIDDEN> writes:
>
>>> (gdb) bt full
>>> #0  terminate_due_to_signal (sig=11, backtrace_limit=40) at emacs.c:444
>>> No locals.
>>> #1  0x000055555589a228 in handle_fatal_signal (sig=11) at sysdep.c:1793
>>> No locals.
>>> #2  0x000055555589a2b2 in deliver_thread_signal (sig=11, handler=0x55555589a210 <handle_fatal_signal>) at sysdep.c:1785
>>>         old_errno = 2
>>> #3  0x00005555558959ea in deliver_fatal_thread_signal (sig=11) at sysdep.c:1805
>>> No locals.
>>> #4  0x000055555589a342 in handle_sigsegv (sig=11, siginfo=0x555555bfb7f0 <sigsegv_stack+62928>, arg=0x555555bfb6c0 <sigsegv_stack+62624>) at sysdep.c:1943
>>>         fatal = false
>>> #5  <signal handler called>
>>> No locals.
>>> #6  0x00007ffff57d0327 in __GI_kill () at ../sysdeps/unix/syscall-template.S:120
>>> No locals.
>>> #7  0x0000555555b5f0f9 in sigHandle ()
>>> No symbol table info available.
>>> #8  <signal handler called>
>>> No locals.
>>> #9  0x00005555556ca07a in line_hash_code (f=0x7fff43aae670, row=0x555556059240) at dispnew.c:1196
>>>         c = 32
>>>         face_id = 0
>>>         glyph = 0x55556d380850
>>>         end = 0x55556d3820d0
>>>         hash = 0
>>
>> Could you show glyph->frame, f, *glyph->frame, and *f in this stack
>> frame?
>>
>> Is it possible we're simply failing to trace glyph->frame in
>> fix_glyph_matrix? Is there some reason those frames should be pinned,
>> but might fail to be?
>
> Assuming the answers are "yes" and "no", respectively, I think these two
> patches might help:
>
> John, would it be possible for you to keep your current Emacs session
> alive in gdb but start a new one with these patches to see whether the
> issue still happens?


I'd rather recommend trying with the commit I mentioned in
my other mail reverted. That should add the tracing of glyph::frame to
the pools. Then let's see further.

> Of course, this may fail to work because of the glyph pool tracing bug
> Helmut discovered; Helmut, do you have a preference for how to fix
> that?

Has there been proof of the bug meanwhile? In the case where Helmut said
that, glyph pools were not even used.

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> Cc: Gerd Möllmann <gerd.moellmann@HIDDEN>,
>  Helmut Eller <eller.helmut@HIDDEN>, 79193 <at> debbugs.gnu.org
> Date: Thu, 07 Aug 2025 17:51:12 +0000
> From:  Pip Cet via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> --- a/src/dispnew.c
> +++ b/src/dispnew.c
> @@ -1192,8 +1192,17 @@ line_hash_code (struct frame *f, struct glyph_row *row)
>  	     index into the frame's face cache), we need the hash
>  	     value to include something specific to the frame, and we
>  	     use the frame cache's address for that purpose.  */
> +#ifndef HAVE_MPS
>  	  if (glyph->frame && glyph->frame != f)
>  	    face_id += (uintptr_t) glyph->frame->face_cache;
> +#else
> +	  if (glyph->frame && glyph->frame != f)
> +	    {
> +	      Lisp_Object face_cache;
> +	      XSETVECTOR (face_cache, glyph->frame->face_cache);
> +	      face_id += igc_hash (face_cache);
> +	    }

Please make sure that the comment to this code is updated to account
for the HAVE_MPS case.

Thanks.

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Pip Cet <pipcet@HIDDEN> writes:

 * src/dispnew.c (line_hash_code) [MPS]: Use 'igc_hash', not the
> address of a movable object, as a hash value.
> ---
>  src/dispnew.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/src/dispnew.c b/src/dispnew.c
> index 1eaab64d876..755422b7cf1 100644
> --- a/src/dispnew.c
> +++ b/src/dispnew.c
> @@ -1192,8 +1192,17 @@ line_hash_code (struct frame *f, struct glyph_row *row)
>  	     index into the frame's face cache), we need the hash
>  	     value to include something specific to the frame, and we
>  	     use the frame cache's address for that purpose.  */
> +#ifndef HAVE_MPS
>  	  if (glyph->frame && glyph->frame != f)
>  	    face_id += (uintptr_t) glyph->frame->face_cache;
> +#else
> +	  if (glyph->frame && glyph->frame != f)
> +	    {
> +	      Lisp_Object face_cache;
> +	      XSETVECTOR (face_cache, glyph->frame->face_cache);
> +	      face_id += igc_hash (face_cache);
                         ^^^^^^^^
BTW, good catch!

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On Thu, Aug 07 2025, Pip Cet via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

[...]
> Of course, this may fail to work because of the glyph pool tracing bug
> Helmut discovered; Helmut, do you have a preference for how to fix that?
> My preference would be to simply use igc_xzalloc_ambig, but I also have
> code here to make glyph pools, and glyph arrays, special IGC object
> types.

I would prefer to have a reproducible test case first.  So far the
problem is only theoretical; we don't know whether it occurs in
practice.  If it actually occurs, then we can decide how to fix it.

Helmut

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From: Helmut Eller <eller.helmut@HIDDEN>
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Date: Fri, 08 Aug 2025 08:40:48 +0200
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On Thu, Aug 07 2025, Pip Cet via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

[...]
> Of course, this may fail to work because of the glyph pool tracing bug
> Helmut discovered; Helmut, do you have a preference for how to fix that?
> My preference would be to simply use igc_xzalloc_ambig, but I also have
> code here to make glyph pools, and glyph arrays, special IGC object
> types.

I would prefer to have a reproducible test case first.  So far the
problem is only theoretical; we don't know whether it occurs in
practice.  If it actually occurs, then we can decide how to fix it.

Helmut

Last modified: Fri, 8 Aug 2025 06:45:02 UTC

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