Segfault on Ubuntu 22.04

Applications
1

Hi all,

I installed meld via apt install and it seems to be segfaulting on my system.

I also tried the version from HEAD and I get the same thing. Any ideas? I’m not sure how to debug further.

Here’s some information:

$ meld
[1]    32923 segmentation fault (core dumped)  meld

$ python3 --version
Python 3.10.12

$ cat /etc/os-release
PRETTY_NAME="Ubuntu 22.04 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04 (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

$ dpkg -s meld
Package: meld
Status: install ok installed
Priority: optional
Section: gnome
Installed-Size: 3055
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Architecture: all
Version: 3.20.4-2
Depends: python3:any, dconf-gsettings-backend | gsettings-backend, libgtk-3-0 (>= 3.20), python3-gi (>= 3.20), python3-gi-cairo, libgtksourceview-3.0-1 (>= 3.20), gir1.2-gtksource-3.0 (>= 3.20), python3-cairo, patch
Recommends: yelp
Description: graphical tool to diff and merge files
 Meld is a graphical diff viewer and merge application for the GNOME
 desktop. It supports 2 and 3-file diffs, recursive  directory diffs,
 diffing of directories under version control (Bazaar, Codeville, CVS,
 Darcs, Fossil SCM, Git, Mercurial, Monotone, Subversion), as well as
 the ability to manually and automatically merge file differences.
Original-Maintainer: Debian GNOME Maintainers <pkg-gnome-maintainers@lists.alioth.debian.org>
Homepage: http://meldmerge.org

$ gdb -ex "set args $(which meld)" /usr/bin/python3
GNU gdb (Ubuntu 12.1-0ubuntu1~22.04.2) 12.1
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/python3...
(No debugging symbols found in /usr/bin/python3)
(gdb) run
Starting program: /usr/bin/python3 /usr/bin/meld
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff2800640 (LWP 33303)]
[New Thread 0x7ffff1e00640 (LWP 33304)]
[New Thread 0x7ffff1400640 (LWP 33305)]

Thread 1 "python3" received signal SIGSEGV, Segmentation fault.
0x00007ffff6e92a26 in ?? () from /lib/x86_64-linux-gnu/libgio-2.0.so.0
(gdb) bt
#0  0x00007ffff6e92a26 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#1  0x00007ffff6e92e38 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#2  0x00007ffff6e93073 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#3  0x00007ffff6e93073 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007ffff6e93073 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007ffff6e93073 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#6  0x00007ffff6e93073 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
... continues in a loop
2

See this guide. The stack trace you posted was generated without debuginfo, so we cannot see where it’s crashing.

3

Ok, I think I got a bit further here:

# https://ubuntu.com/server/docs/debug-symbol-packages
sudo apt install libglib2.0-0-dbgsym

(gdb) run
Starting program: /usr/bin/python3 /usr/bin/meld
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff2800640 (LWP 221844)]
[New Thread 0x7ffff1e00640 (LWP 221845)]
[New Thread 0x7ffff1400640 (LWP 221846)]

Thread 1 "python3" received signal SIGSEGV, Segmentation fault.
0x00007ffff6e92a4e in cache_alias_lookup (alias=alias@entry=0x7ffff28de978 "application/ecmascript") at ../../../gio/xdgmime/xdgmimecache.c:312
312     ../../../gio/xdgmime/xdgmimecache.c: No such file or directory.
(gdb) bt
#0  0x00007ffff6e92a4e in cache_alias_lookup (alias=alias@entry=0x7ffff28de978 "application/ecmascript") at ../../../gio/xdgmime/xdgmimecache.c:312
#1  0x00007ffff6e92e38 in __gio_xdg_cache_unalias_mime_type (mime=0x7ffff28de978 "application/ecmascript") at ../../../gio/xdgmime/xdgmimecache.c:988
#2  __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28de978 "application/ecmascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:911
#3  0x00007ffff6e93073 in __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28b5fdc "text/javascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:971
#4  0x00007ffff6e93073 in __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28de978 "application/ecmascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:971
#5  0x00007ffff6e93073 in __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28b5fdc "text/javascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:971
#6  0x00007ffff6e93073 in __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28de978 "application/ecmascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:971
#7  0x00007ffff6e93073 in __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28b5fdc "text/javascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:971
#8  0x00007ffff6e93073 in __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28de978 "application/ecmascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:971
#9  0x00007ffff6e93073 in __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28b5fdc "text/javascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:971
#10 0x00007ffff6e93073 in __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28de978 "application/ecmascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:971
#11 0x00007ffff6e93073 in __gio_xdg_cache_mime_type_subclass (mime=mime@entry=0x7ffff28b5fdc "text/javascript", base=base@entry=0x5555562e7690 "application/x-meld-comparison") at ../../../gio/xdgmime/xdgmimecache.c:971
.... continues
4

Ok so, with that stack trace I was able to research more, I found the following: FS#80279 : [glib2] shared-mime-info 2.4-1 issue with javascript/ecmascript definition

Which seems like a known issue. I deleted rm .local/share/recently-used.xbel (likely faulty in some way? should have backed it up… although that post seems to have a repro) and now meld works.

5

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