GNU bug report logs - #44031
28.0.50; Segfault with poly-gfm and atomic-chrome

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: toon <at> iotcl.com
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; Segfault with poly-gfm and atomic-chrome
Date: Fri, 16 Oct 2020 16:29:53 +0200

Hi,

I'm getting a segfault, and it's pretty involved to reproduce, although
repeatable.

It happens when using https://github.com/GhostText/GhostText in Firefox
to edit textareas on webpages with GNU Emacs.

I've set `atomic-chrome-url-major-mode-alist' to:

'(("gitlab\\.com" . poly-gfm-mode)
  ("github\\.com" . poly-gfm-mode))

So in the buffer that is opened from Firefox `poly-gfm-mode', which is
part of https://github.com/polymode/poly-markdown, is activated.

All goes well up to this point, until I want to pass the buffer back to
Firefox. When I press C-c C-c, bound to
`atomic-chrome-close-current-buffer', Emacs crashes.

The backtrace is attached below, but I must say I have no idea what
exactly causes this crash.

I could not reproduce with `poly-gfm-mode' in a normal file buffer, and
also not with `atomic-chrome' and `fundamental-mode'.

I'm happy to help debug the issue, but to be honest I don't know where
to start. So any pointer in the right direction is welcome.

At the moment, I'm using gccemacs from feature/native-comp. But I've
tested it also with 27.1, installed from my distro package manager, and
it has the same issue, but I didn't have debug symbols on that one.


Kind regards,
Toon Claes


Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
0x000055555576f55f in find_newline (start=33, start_byte=33, end=1, end_byte=1, count=-1, counted=0x7fffffffd320, bytepos=0x7fffffffd358, allow_quit=true) at search.c:838
838			       && FETCH_BYTE (start_byte - 1) == '\n')
(gdb) bt full
#0  0x000055555576f55f in find_newline (start=33, start_byte=33, end=1, end_byte=1, count=-1, counted=0x7fffffffd320, bytepos=0x7fffffffd358, allow_quit=true) at search.c:838
        lim1 = 1
        next_change = 1
        result = 0
        tem = 93824994639943
        ceiling_byte = 1
        newline_cache = 0x555557a13bd0
        cache_buffer = 0x55555e16cdf0
#1  0x000055555576f9e0 in scan_newline_from_point (count=0, charpos=0x7fffffffd350, bytepos=0x7fffffffd358) at search.c:969
        counted = -1
#2  0x00005555557af624 in Fline_beginning_position (n=XIL(0)) at editfns.c:734
        charpos = 93824994632170
        bytepos = 12884890480
        count = 0
#3  0x00007fffec3148f7 in F686c2d6c696e652d6d6f7665_hl_line_move_0 ()
    at /home/toon/devel/emacs/git/native-lisp/28.0.50-x86_64-pc-linux-gnu-6cfcb8528dcd59ccbaf37732d0a23b35/hl-line-84e3c419f5fbf1f7daa09a3bfdd7972c-3b84a106c30ad023d9e5f09c088c2e88.eln
#4  0x00005555557c3e98 in funcall_subr (subr=0x555557b1f530, numargs=1, args=0x7fffffffd508) at eval.c:2947
        internal_argbuf = {XIL(0), XIL(0x7fffffffd440), XIL(0x555555cf3d80), XIL(0), XIL(0), XIL(0x7fffffffd460), XIL(0x5555557bccf4), XIL(0x57b1f535)}
        internal_args = 0x7fffffffd508
#5  0x00005555557c3a48 in Ffuncall (nargs=2, args=0x7fffffffd500) at eval.c:2872
        fun = XIL(0x555557b1f535)
        original_fun = XIL(0xae2060)
        funcar = XIL(0xc216a0)
        numargs = 1
        val = XIL(0x25699d510)
        count = 5
#6  0x00007fffec314361 in F676c6f62616c2d686c2d6c696e652d686967686c69676874_global_hl_line_highlight_0 ()
    at /home/toon/devel/emacs/git/native-lisp/28.0.50-x86_64-pc-linux-gnu-6cfcb8528dcd59ccbaf37732d0a23b35/hl-line-84e3c419f5fbf1f7daa09a3bfdd7972c-3b84a106c30ad023d9e5f09c088c2e88.eln
#7  0x00005555557c3e7c in funcall_subr (subr=0x555557b18110, numargs=0, args=0x7fffffffd650) at eval.c:2945
        internal_argbuf = {XIL(0), XIL(0x7fffffffd590), XIL(0x555555cf3d80), XIL(0), XIL(0), XIL(0x7fffffffd5b0), XIL(0x5555557bccf4), XIL(0x57b18115)}
        internal_args = 0x7fffffffd650
#8  0x00005555557c3a48 in Ffuncall (nargs=1, args=0x7fffffffd648) at eval.c:2872
        fun = XIL(0x555557b18115)
        original_fun = XIL(0xae20f0)
        funcar = XIL(0x30)
        numargs = 0
        val = XIL(0x59410fc3)
        count = 4
#9  0x00005555557c328f in call0 (fn=XIL(0xae20f0)) at eval.c:2725
#10 0x0000555555704860 in safe_run_hooks_1 (nargs=2, args=0x7fffffffd6f0) at keyboard.c:1779
#11 0x00005555557c0279 in internal_condition_case_n (bfun=0x55555570483d <safe_run_hooks_1>, nargs=2, args=0x7fffffffd6f0, handlers=XIL(0x30), hfun=0x555555704862 <safe_run_hooks_error>) at eval.c:1500
        val = make_fixnum(23456248495985)
        c = 0x555555f279c0
#12 0x0000555555704cef in safe_run_hook_funcall (nargs=2, args=0x7fffffffd7a0) at keyboard.c:1826
#13 0x00005555557c3127 in run_hook_with_args (nargs=2, args=0x7fffffffd7a0, funcall=0x555555704c8a <safe_run_hook_funcall>) at eval.c:2690
        global_vals = XIL(0)
        sym = XIL(0xb910)
        val = XIL(0x55555915e633)
        ret = XIL(0)
#14 0x0000555555704d7e in safe_run_hooks (hook=XIL(0xb910)) at keyboard.c:1842
        count = 3
#15 0x0000555555702c7e in command_loop_1 () at keyboard.c:1261
        prev_modiff = 0
        prev_buffer = 0x0
        already_adjusted = false
#16 0x00005555557bfeeb in internal_condition_case (bfun=0x555555702b6d <command_loop_1>, handlers=XIL(0x90), hfun=0x5555557022e6 <cmd_error>) at eval.c:1365
        val = make_fixnum(23456248495985)
        c = 0x555555f27e20
#17 0x0000555555702835 in command_loop_2 (ignore=XIL(0)) at keyboard.c:1095
        val = XIL(0)
--Type <RET> for more, q to quit, c to continue without paging--c
#18 0x00005555557bf75c in internal_catch (tag=XIL(0xe0a0), func=0x555555702808 <command_loop_2>, arg=XIL(0)) at eval.c:1126
        val = XIL(0x4ae00000000)
        c = 0x555555f27890
#19 0x00005555557027d4 in command_loop () at keyboard.c:1074
#20 0x0000555555701eb7 in recursive_edit_1 () at keyboard.c:718
        count = 1
        val = XIL(0x5555557c53d3)
#21 0x000055555570203a in Frecursive_edit () at keyboard.c:790
        count = 0
        buffer = XIL(0)
#22 0x00005555556fe922 in main (argc=2, argv=0x7fffffffdca8) at emacs.c:2080
        stack_bottom_variable = 0x126b0
        no_loadup = false
        junk = 0x0
        dname_arg = 0x0
        ch_to_dir = 0x0
        original_pwd = 0x0
        dump_mode = 0x0
        skip_args = 0
        temacs = 0x0
        attempt_load_pdump = true
        rlim = {
          rlim_cur = 10022912,
          rlim_max = 18446744073709551615
        }
        lc_all = 0x7fffffffe92b "en_US.UTF-8"
        sockfd = -1
        module_assertions = false

Lisp Backtrace:
"hl-line-move" (0xffffd508)
"global-hl-line-highlight" (0xffffd650)



In GNU Emacs 28.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo version 1.17.3)
 of 2020-10-04 built on cayonero
Repository revision: 825e85b393a3d78ba43176ecc5bc1a9595d0fbea
Repository branch: feature/native-comp
Windowing system distributor 'The X.Org Foundation', version 11.0.12099001
System Description: Arch Linux

Configured using:
 'configure --prefix=/home/toon/.local --with-mailutils --with-sound=yes
 --with-pdumper=yes --with-xpm --with-jpeg --with-tiff --with-gif
 --with-png --with-rsvg --with-cairo --with-xml2 --without-imagemagick
 --with-native-image-api --with-json --with-xft --with-harfbuzz
 --with-libotf --with-zlib --with-x --with-gnutls=ifavailable
 --with-nativecomp CFLAGS=-ggdb3 LDFLAGS=-ggdb3'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES NATIVE_COMP THREADS
LIBSYSTEMD JSON PDUMPER LCMS2

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LC_CTYPE: en_US.UTF-8
  value of $LANG: en_be.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  global-company-mode: t
  global-temacco-mode: t
  global-magit-file-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  flycheck-indicator-mode: t
  erc-autojoin-mode: t
  erc-services-mode: t
  erc-networks-mode: t
  global-flycheck-mode: t
  shell-dirtrack-mode: t
  save-place-mode: t
  ivy-historian-mode: t
  historian-mode: t
  ivy-mode: t
  minions-mode: t
  global-display-fill-column-indicator-mode: t
  global-hl-line-mode: t
  show-paren-mode: t
  global-ligature-mode: t
  override-global-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

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/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ol-w3m hides /home/toon/devel/emacs/git/lisp/org/ol-w3m
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-haskell hides /home/toon/devel/emacs/git/lisp/org/ob-haskell
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ox-texinfo hides /home/toon/devel/emacs/git/lisp/org/ox-texinfo
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-num hides /home/toon/devel/emacs/git/lisp/org/org-num
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-plantuml hides /home/toon/devel/emacs/git/lisp/org/ob-plantuml
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-clojure hides /home/toon/devel/emacs/git/lisp/org/ob-clojure
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-entities hides /home/toon/devel/emacs/git/lisp/org/org-entities
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-maxima hides /home/toon/devel/emacs/git/lisp/org/ob-maxima
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-compat hides /home/toon/devel/emacs/git/lisp/org/org-compat
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-calc hides /home/toon/devel/emacs/git/lisp/org/ob-calc
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-shell hides /home/toon/devel/emacs/git/lisp/org/ob-shell
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-table hides /home/toon/devel/emacs/git/lisp/org/ob-table
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ox-latex hides /home/toon/devel/emacs/git/lisp/org/ox-latex
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-latex hides /home/toon/devel/emacs/git/lisp/org/ob-latex
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-exp hides /home/toon/devel/emacs/git/lisp/org/ob-exp
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-src hides /home/toon/devel/emacs/git/lisp/org/org-src
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-vala hides /home/toon/devel/emacs/git/lisp/org/ob-vala
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ox-ascii hides /home/toon/devel/emacs/git/lisp/org/ox-ascii
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-eshell hides /home/toon/devel/emacs/git/lisp/org/ob-eshell
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-comint hides /home/toon/devel/emacs/git/lisp/org/ob-comint
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ol-eshell hides /home/toon/devel/emacs/git/lisp/org/ol-eshell
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ox-beamer hides /home/toon/devel/emacs/git/lisp/org/ox-beamer
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-picolisp hides /home/toon/devel/emacs/git/lisp/org/ob-picolisp
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ox-odt hides /home/toon/devel/emacs/git/lisp/org/ox-odt
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-ledger hides /home/toon/devel/emacs/git/lisp/org/ob-ledger
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-footnote hides /home/toon/devel/emacs/git/lisp/org/org-footnote
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-css hides /home/toon/devel/emacs/git/lisp/org/ob-css
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-crypt hides /home/toon/devel/emacs/git/lisp/org/org-crypt
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-attach-git hides /home/toon/devel/emacs/git/lisp/org/org-attach-git
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ol-mhe hides /home/toon/devel/emacs/git/lisp/org/ol-mhe
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-install hides /home/toon/devel/emacs/git/lisp/org/org-install
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ol hides /home/toon/devel/emacs/git/lisp/org/ol
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ox-md hides /home/toon/devel/emacs/git/lisp/org/ox-md
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-ocaml hides /home/toon/devel/emacs/git/lisp/org/ob-ocaml
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ol-bbdb hides /home/toon/devel/emacs/git/lisp/org/ol-bbdb
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-macs hides /home/toon/devel/emacs/git/lisp/org/org-macs
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-version hides /home/toon/devel/emacs/git/lisp/org/org-version
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-protocol hides /home/toon/devel/emacs/git/lisp/org/org-protocol
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ox hides /home/toon/devel/emacs/git/lisp/org/ox
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/ob-dot hides /home/toon/devel/emacs/git/lisp/org/ob-dot
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-timer hides /home/toon/devel/emacs/git/lisp/org/org-timer
/home/toon/.config/emacs/elpa/org-plus-contrib-20200928/org-duration hides /home/toon/devel/emacs/git/lisp/org/org-duration

Features:
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magit-core magit-autorevert magit-margin magit-transient magit-process
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Memory information:
((conses 16 781335 512000)
 (symbols 48 54566 837)
 (strings 32 207850 59773)
 (string-bytes 1 6781358)
 (vectors 16 83007)
 (vector-slots 8 2187204 586835)
 (floats 8 517 1427)
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 (buffers 992 12))

Message #8 received at 44031 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: toon <at> iotcl.com
Cc: 44031 <at> debbugs.gnu.org
Subject: Re: bug#44031: 28.0.50; Segfault with poly-gfm and atomic-chrome
Date: Mon, 06 Jun 2022 19:57:08 +0200

toon <at> iotcl.com writes:

> All goes well up to this point, until I want to pass the buffer back to
> Firefox. When I press C-c C-c, bound to
> `atomic-chrome-close-current-buffer', Emacs crashes.
>
> The backtrace is attached below, but I must say I have no idea what
> exactly causes this crash.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

> Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
> 0x000055555576f55f in find_newline (start=33, start_byte=33, end=1, end_byte=1, count=-1, counted=0x7fffffffd320, bytepos=0x7fffffffd358, allow_quit=true) at search.c:838
> 838			       && FETCH_BYTE (start_byte - 1) == '\n')
> (gdb) bt full
> #0  0x000055555576f55f in find_newline (start=33, start_byte=33, end=1, end_byte=1, count=-1, counted=0x7fffffffd320, bytepos=0x7fffffffd358, allow_quit=true) at search.c:838
>         lim1 = 1
>         next_change = 1
>         result = 0
>         tem = 93824994639943
>         ceiling_byte = 1
>         newline_cache = 0x555557a13bd0
>         cache_buffer = 0x55555e16cdf0
> #1  0x000055555576f9e0 in scan_newline_from_point (count=0, charpos=0x7fffffffd350, bytepos=0x7fffffffd358) at search.c:969

I vaguely remember there being some fixes in this area somewhat recently
(but I may well be misremembering).  Do you still see these crashes with
the current Emacs trunk?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 44031 <at> debbugs.gnu.org (full text, mbox):

From: Toon Claes <toon <at> iotcl.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 44031 <at> debbugs.gnu.org
Subject: Re: bug#44031: 28.0.50; Segfault with poly-gfm and atomic-chrome
Date: Mon, 06 Jun 2022 20:31:37 +0200

On Mon, Jun 06 2022, Lars Ingebrigtsen wrote:

> I vaguely remember there being some fixes in this area somewhat recently
> (but I may well be misremembering).  Do you still see these crashes with
> the current Emacs trunk?

I haven't using poly-gfm over the last year+, so I cannot say whether
this was fixed or not. Anyhow, I don't see any reason to keep this bug
open.

Thanks Lars! I'll be happy to see this be contribute to yet another "%"
blog post.

--
Toon

Message #16 received at 44031 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Toon Claes <toon <at> iotcl.com>
Cc: 44031 <at> debbugs.gnu.org
Subject: Re: bug#44031: 28.0.50; Segfault with poly-gfm and atomic-chrome
Date: Tue, 07 Jun 2022 11:26:47 +0200

Toon Claes <toon <at> iotcl.com> writes:

> I haven't using poly-gfm over the last year+, so I cannot say whether
> this was fixed or not. Anyhow, I don't see any reason to keep this bug
> open.

Thanks; closing this bug report, then.

> Thanks Lars! I'll be happy to see this be contribute to yet another "%"
> blog post.

😀

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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