gnome-extensions-app crash, parser_get_compose_table: assertion failed:

[bob]

ENV: Ubuntu 22.04.2 LTS on X11, GNOME Shell 42.9
symptom :
gnome-extensions-app crash everytime right at start.
message:
```
/usr/bin/gnome-extensions-app
**
Gtk:ERROR:../../../gtk/gtkcomposetable.c:981:parser_get_compose_table: assertion failed: (data[first_pos + i] <= data[first_pos + i + 1])
Bail out! Gtk:ERROR:../.
```

gdb backtrace:
```
**
Gtk:ERROR:../../../gtk/gtkcomposetable.c:981:parser_get_compose_table: assertion failed: (data[first_pos + i] <= data[first_pos + i + 1])
Bail out! Gtk:ERROR:../../../gtk/gtkcomposetable.c:981:parser_get_compose_table: assertion failed: (data[first_pos + i] <= data[first_pos + i + 1])

Thread 16 "pool-gnome-exte" received signal SIGABRT, Aborted.
[Switching to Thread 0x7ffff0858640 (LWP 9456)]
__pthread_kill_implementation (no_tid=0, signo=6, threadid=140737228670528) at ./nptl/pthread_kill.c:44
44 ./nptl/pthread_kill.c: No such file or directory.
(gdb) bt
#0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=140737228670528) at ./nptl/pthread_kill.c:44
#1 __pthread_kill_internal (signo=6, threadid=140737228670528) at ./nptl/pthread_kill.c:78
#2 __GI___pthread_kill (threadid=140737228670528, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3 0x00007ffff76bb476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4 0x00007ffff76a17f3 in __GI_abort () at ./stdlib/abort.c:79
#5 0x00007ffff7d44b57 in () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6 0x00007ffff7d9e70f in g_assertion_message_expr () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7 0x00007ffff11be0e3 in () at /lib/x86_64-linux-gnu/libgtk-4.so.1
#8 0x00007ffff123a0b4 in () at /lib/x86_64-linux-gnu/libgtk-4.so.1
#9 0x00007ffff123a7b1 in () at /lib/x86_64-linux-gnu/libgtk-4.so.1
#10 0x00007ffff7b9f194 in () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#11 0x00007ffff7dad6b4 in () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007ffff7daaa51 in () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007ffff770db43 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#14 0x00007ffff779fa00 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

```

Moreover, I found in my snap logs that there was update recently applied, might be linked

```
$snap changes
ID Status Spawn Ready Summary
253 Done yesterday at 21:47 CEST yesterday at 21:47 CEST Remove "gnome-3-34-1804" snap
254 Done yesterday at 22:23 CEST yesterday at 22:23 CEST Refresh "gnome-3-38-2004" snap
```

Moreover, is seems I have multiple snap version of gnome installed

```
snap list
...
gnome-3-28-1804 3.28.0-19-g98f9e67.98f9e67 198 latest/stable canonical✓ -
gnome-3-38-2004 0+git.efb213a 143 latest/stable canonical✓ -
gnome-42-2204 0+git.ff35a85 120 latest/stable canonical✓ -
....

```

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gnome (not installed)
ProcVersionSignature: Ubuntu 5.15.0-76.83-generic 5.15.99
Uname: Linux 5.15.0-76-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul 12 12:10:10 2023
InstallationDate: Installed on 2021-08-18 (692 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: meta-gnome3
UpgradeStatus: Upgraded to jammy on 2023-07-01 (10 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

Following the upstream bug...

Do you have a ~/.config/gtk-4.0/Compose file? If so, please attach it

[bob (bababa45)]

I do not have a ` ~/.config/gtk-4.0/Compose file` file

[bob (bababa45)]

the message above says `fix released`. Where can I find the fix ?

[Daniel van Vugt (vanvugt)]

There is no identifiable fix, that's just a Launchpad quirk. It says "Fix Released" for any closed bug. In this case it was closed because the bug stopped happening without explanation:
https://gitlab.gnome.org/GNOME/gtk/-/issues/4990

[bob (bababa45)]

it seems to be an issue with gtk 4.

$ sudo apt install gtk-4-examples
$ gtk4-demo-application

the demo app gives me the same error.

the binary is dynamically linked to
 /lib/x86_64-linux-gnu/libgtk-4.so.1

which itself point to
/lib/x86_64-linux-gnu/libgtk-4.so.1.600.6

[bob (bababa45)]

here is the list of gtk4 package installed on my machine, maybe there is something wrong with them ?

$ apt list | grep -i "gtk4\|gtk-4"

awf-gtk4/jammy 2.5.0-5 amd64
fcitx5-frontend-gtk4/jammy 5.0.12-1 amd64
gir1.2-gtk-4.0/jammy-updates,now 4.6.6+ds-0ubuntu1 amd64 [installed,automatic]
gir1.2-gtk-4.0/jammy-updates 4.6.6+ds-0ubuntu1 i386
gir1.2-javascriptcoregtk-4.0/jammy-updates,jammy-security,now 2.38.6-0ubuntu0.22.04.1 amd64 [installed,automatic]
gir1.2-javascriptcoregtk-4.0/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 i386
gir1.2-javascriptcoregtk-4.1/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 amd64
gir1.2-javascriptcoregtk-4.1/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 i386
gir1.2-xdpgtk4-1.0/jammy 0.6-2 amd64
gtk-4-examples/jammy-updates,now 4.6.6+ds-0ubuntu1 amd64 [installed]
gtk-4-examples/jammy-updates 4.6.6+ds-0ubuntu1 i386
gtk-4-tests/jammy-updates 4.6.6+ds-0ubuntu1 amd64
gtk-4-tests/jammy-updates 4.6.6+ds-0ubuntu1 i386
ibus-gtk4/jammy 1.5.26-4 amd64
ibus-gtk4/jammy 1.5.26-4 i386
libdbusmenu-gtk4/jammy 16.04.1+18.10.20180917-0ubuntu8 amd64
libfm-gtk4/jammy 1.3.2-1 amd64
libgtk-4-1/jammy-updates,now 4.6.6+ds-0ubuntu1 amd64 [installed,automatic]
libgtk-4-1/jammy-updates 4.6.6+ds-0ubuntu1 i386
libgtk-4-bin/jammy-updates 4.6.6+ds-0ubuntu1 amd64
libgtk-4-bin/jammy-updates 4.6.6+ds-0ubuntu1 i386
libgtk-4-common/jammy-updates,jammy-updates,now 4.6.6+ds-0ubuntu1 all [installed,automatic]
libgtk-4-dev/jammy-updates,now 4.6.6+ds-0ubuntu1 amd64 [installed]
libgtk-4-dev/jammy-updates 4.6.6+ds-0ubuntu1 i386
libgtk-4-doc/jammy-updates,jammy-updates 4.6.6+ds-0ubuntu1 all
libgtk-4-media-gstreamer/jammy-updates 4.6.6+ds-0ubuntu1 amd64
libgtk-4-media-gstreamer/jammy-updates 4.6.6+ds-0ubuntu1 i386
libjavascriptcoregtk-4.0-18/jammy-updates,jammy-security,now 2.38.6-0ubuntu0.22.04.1 amd64 [installed,automatic]
libjavascriptcoregtk-4.0-18/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 i386
libjavascriptcoregtk-4.0-bin/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 amd64
libjavascriptcoregtk-4.0-bin/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 i386
libjavascriptcoregtk-4.0-dev/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 amd64
libjavascriptcoregtk-4.0-dev/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 i386
libjavascriptcoregtk-4.1-0/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 amd64
libjavascriptcoregtk-4.1-0/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 i386
libjavascriptcoregtk-4.1-dev/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 amd64
libjavascriptcoregtk-4.1-dev/jammy-updates,jammy-security 2.38.6-0ubuntu0.22.04.1 i386
libportal-gtk4-1/jammy 0.6-2 amd64
libportal-gtk4-dev/jammy 0.6-2 amd64
libportal-tests-gtk4/jammy,jammy 0.6-2 all
librust-gtk4-macros-dev/jammy 0.3.1-1 amd64
librust-gtk4-sys-dev/jammy 0.3.1-1 amd64
libswt-cairo-gtk-4-jni/jammy 4.20.0-2 amd64
libswt-glx-gtk-4-jni/jammy 4.20.0-2 amd64
libswt-gtk-4-java/jammy 4.20.0-2 amd64
libswt-gtk-4-jni/jammy 4.20.0-2 amd64
libswt-webkit-gtk-4-jni/jammy 4.20.0-2 amd64
libwebkit2gtk-4.0-37/jammy-updates,jammy-security,now 2.38.6-0ubuntu0.22.04.1 amd64 [installed,automatic]
libwebkit2gtk-4.0-37/jammy-updates,jammy-...

[bob (bababa45)]

culprit seems to be keyd
https://github.com/rvaiya/keyd/issues/537

[bob (bababa45)]

Issue was due to .XCompose beeing too long (40K Lines).
[mirror for the file](https://github.com/rvaiya/keyd/blob/master/data/keyd.compose)
(careful, `cat` does not display it fully, use `vim`)
GTK3 could handle it without issue.
GTK4 crash in the unexpected mannger described above.