GNU bug report logs - #42897
28.0.50; Segfault in ftcrfont_open()

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Package: emacs;

Reported by: Sophie Taylor <sophie.taylor <at> hdr.qut.edu.au>

Date: Mon, 17 Aug 2020 06:30:01 UTC

Severity: normal

Tags: moreinfo

Found in version 28.0.50

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#42897; Package emacs. (Mon, 17 Aug 2020 06:30:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to Sophie Taylor <sophie.taylor <at> hdr.qut.edu.au>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Mon, 17 Aug 2020 06:30:02 GMT) Full text and rfc822 format available.

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

From: Sophie Taylor <sophie.taylor <at> hdr.qut.edu.au>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 28.0.50; Segfault in ftcrfont_open()
Date: Mon, 17 Aug 2020 04:14:23 +0000
Hiya.

I spent the last five days debugging a segfault in `ftcrfont_open()`. I
don't have access to the system

which I was encountering the error at the moment, so most of the
emacs-generated info below is irrelevant, but
it occurred in 28.0.50, both master and native-comp.

It worked fine in `emacsclient -nw`, but if I attached a graphical
client, it would immediately segfault.

I'll tell you how I (think I) solved it, and what my guesses are, and
try to recreate the hard evidence when I
can over the next few days.

I am using NixOS, with home-manager and the nix-community/emacs-overlay.
I had in my `extraPackages` list:

> pkgs.emacs-all-the-icons-fonts

However, I had not included it in my NixOS `fonts.fonts` list. [I guess
this caused fontconfig to not pick it
up, but emacs picked it up.]

When I loaded `all-the-icons`, I was not calling
`all-the-icons-install-fonts` due to the aforementioned
package.

[My guess is that when an icon from `all-the-icons` was supposed to be
displayed, e.g. in my
modeline, in `centaur-tabs` or in `dashboard`, emacs saw that the font
was there somewhere, but fontconfig
either had no idea about it, or it had incorrect information about its
path due to NixOS shenanigans.
`ftcrfont_open()` then tried to open it, but didn't validate the
parameters, or didn't check the return value

of one of the calls it makes, resulting in the segfault.]


Adding `pkgs.emacs-all-the-icons-fonts` to my `fonts.fonts` NixOS
configuration caused the segfault to not happen anymore.


Thanks,
Sophie Taylor




In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.21, cairo version 1.16.0)
Repository revision: f2e6168ece69d635b4f9d9a138100c6772903d0b
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Ubuntu 20.04.1 LTS

Recent messages:
Composing main Info directory...done
Info-find-file: Info file info does not exist
byte-code: The Info directory node has no index; use m to select a manual
Info-find-file: Info file autotype does not exist
Beginning of buffer [2 times]
uncompressing hippie-exp.el.gz...done
Note: file is write protected [2 times]
Starting a new list of tags tables
Beginning of buffer [15 times]
Error during redisplay: (run-hook-with-args helm--delete-frame-function
#) signaled (user-error "No recursive edit is in progress")

Configured using:
'configure
--prefix=/nix/store/isl99gwfrsy1v1zl03b7j3chaqscdzgj-emacs-gcc-20200815.0
--disable-build-details
--with-modules --with-x-toolkit=gtk3 --with-xft --with-xwidgets
--with-nativecomp
CFLAGS=-DMAC_OS_X_VERSION_MAX_ALLOWED=101200'

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

Important settings:
value of $EMACSLOADPATH:
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value of $LC_MONETARY: en_AU.UTF-8
value of $LC_NUMERIC: en_AU.UTF-8
value of $LC_TIME: en_AU.UTF-8
value of $LANG: en_AU.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix

Major mode: ELisp/d

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centaur-tabs-mode: t
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eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
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Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#42897; Package emacs. (Mon, 17 Aug 2020 23:31:01 GMT) Full text and rfc822 format available.

Message #8 received at 42897 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Sophie Taylor <sophie.taylor <at> hdr.qut.edu.au>
Cc: 42897 <at> debbugs.gnu.org
Subject: 28.0.50; Segfault in ftcrfont_open()
Date: Mon, 17 Aug 2020 16:30:06 -0700
Thanks for reporting that. What a pain, huh?

Can you reproduce the bug under GDB? Something like this:

$ cd src
$ gdb emacs
(gdb) source .gdbinit
(gdb) r
[Emacs crashes, GDB takes over.]
(gdb) bt

For more details, please see the file 'etc/DEBUG'.




Added tag(s) moreinfo. Request was from Stefan Kangas <stefan <at> marxist.se> to control <at> debbugs.gnu.org. (Tue, 25 Aug 2020 13:28:02 GMT) Full text and rfc822 format available.

Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#42897; Package emacs. (Thu, 22 Oct 2020 12:41:02 GMT) Full text and rfc822 format available.

Message #13 received at 42897 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: Sophie Taylor <sophie.taylor <at> hdr.qut.edu.au>, 42897 <at> debbugs.gnu.org
Subject: Re: bug#42897: 28.0.50; Segfault in ftcrfont_open()
Date: Thu, 22 Oct 2020 14:40:13 +0200
Paul Eggert <eggert <at> cs.ucla.edu> writes:

> Thanks for reporting that. What a pain, huh?
>
> Can you reproduce the bug under GDB? Something like this:
>
> $ cd src
> $ gdb emacs
> (gdb) source .gdbinit
> (gdb) r
> [Emacs crashes, GDB takes over.]
> (gdb) bt

This was nine weeks ago, and there was no response, so I'm closing this
bug report.  However, bug#41627 (which may well have been the same as
this bug) has been fixed on the trunk.

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




bug closed, send any further explanations to 42897 <at> debbugs.gnu.org and Sophie Taylor <sophie.taylor <at> hdr.qut.edu.au> Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Thu, 22 Oct 2020 12:41:03 GMT) Full text and rfc822 format available.

bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Fri, 20 Nov 2020 12:24:11 GMT) Full text and rfc822 format available.

This bug report was last modified 3 years and 128 days ago.

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