[SIGABRT] QFontDatabase: Must construct a QGuiApplication before accessing QFontDatabase

changed the description

Please let me know if you need any additional info about my system.

No I think it's ok. But I can't reproduce the sigabrt error on m devices. (fedora 31 too)

However the error seems clear. Just wondering if @ywang or @mzhang can work on it?

cool， will try

Local build shows exactly the same error. Jami crashes when I'm trying to do anything with a contact that is not yet on my list: send text, initiate call or add itto my list. I have currently one contact in my list. I also copied my account from linux (fedore31/gnome) laptop to mobile phone (android/installed from f-droid).

Video call (outgoing and incoming) with contacts added from paired device (android) are causing a crash after the connection is established and audio call stays active even after crash - I can hear the other side and process /usr/lib64/ring/dring doesn't stop. Restarting jami gets me back into the active call.

Info from gdb session with local buildcrash_info_devel.log

Edit: I never mentioned I use gnome (xorg). I switched temporarly to wayland, but jami is completely unusable under wayland (window is not refreshing properly, ghosting, etc), so I couldn't properly test the QFontDatabase issue.

Please close the bug if you can't replicate it. It's most likely my local setup problem as clean jami install in virtual machine works as expected, including default wayland.

I don't think it's your setup. However, the gnome-client don't use QFontDatabase, so don't understand why this errors is here.

My guess after a very quic k &rough debugging: the error is triggered in lrc when it tries to create/retrive avatar image. It uses Qt, Qt tries to show some error, but there is no GUI, so no QGuiApplication has been created. That's the line that triggers the error:

const bool ret = qimage.loadFromData(QByteArray::fromBase64(image.toUtf8()), 0);

It's in storagehelper.cpp in function compressedAvatar

P.S. I might be completely wrong on the above :-)

This doesn't make sense. Nothing should be related to QFontDatabase there. Nothing in the Qt doc show this.

The only part in the codebase where QFontDatabase is called is "QFontDatabase::addApplicationFont(":/images/FontAwesome.otf");" but it's the windows client, not the gnome one.

@sblin

I think, as the debug info shows, QImage::loadFromData will finally call QFontDatabase functions.

Although, I do not know why, but something may happen here

yeah yeah maybe, but if it's the case it's bad to not document this. Moreover, this is weird to get this on fedora 31 (I use it too)

@PrzemoF is this the case if qt5-qtimageformats is installed?

Also, do you have this file:

/usr/lib64/qt5/plugins/imageformats/libpbf.so?

I get this on fedora 31 cinnamon https://spins.fedoraproject.org/cinnamon/

`** Message: 14:46:54.272: Jami GNOME client version: 37d32f9c9ab769d9838e6f146796410d2aa97290 ** Message: 14:46:54.272: git ref: unknown Can't open file: "/home/user/.local/share/jami/371fee72c4a48022/profile.vcf"

(jami-gnome:4459): Gtk-WARNING **: 14:46:54.663: Child name 'calls' not found in GtkStack

(jami-gnome:4459): Gtk-CRITICAL **: 14:46:54.665: gtk_container_remove: assertion 'GTK_IS_WIDGET (widget)' failed

(jami-gnome:4459): Gtk-CRITICAL **: 14:46:54.666: gtk_container_add: assertion 'GTK_IS_WIDGET (widget)' failed

(jami-gnome:4459): Gtk-CRITICAL **: 14:46:54.666: gtk_widget_show: assertion 'GTK_IS_WIDGET (widget)' failed

(jami-gnome:4459): Gtk-CRITICAL **: 14:46:54.666: gtk_container_remove: assertion 'GTK_IS_WIDGET (widget)' failed

(jami-gnome:4459): Gtk-CRITICAL **: 14:46:54.666: gtk_container_add: assertion 'GTK_IS_WIDGET (widget)' failed

(jami-gnome:4459): Gtk-CRITICAL **: 14:46:54.666: gtk_widget_show: assertion 'GTK_IS_WIDGET (widget)' failed

(jami-gnome:4459): Gtk-CRITICAL **: 14:46:55.198: gtk_scrolled_window_add: assertion 'child_widget == NULL' failed

(jami-gnome:4459): Gtk-WARNING **: 14:46:55.457: Failed to measure available space: The specified location is not supported

(jami-gnome:4459): Gtk-WARNING **: 14:46:55.461: Failed to measure available space: The specified location is not supported

(jami-gnome:4459): Gtk-WARNING **: 14:46:55.462: Failed to measure available space: The specified location is not supported

(jami-gnome:4459): Gdk-CRITICAL *: 14:46:55.829: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendants_freeze_count > 0' failed could not open shm area "" , shm_open failed: Invalid argument QFontDatabase: Must construct a QGuiApplication before accessing QFontDatabase /usr/bin/jami: line 46: 4459 Aborted (core dumped) jami-gnome $ `

@colin @PrzemoF

Ok, so I think it's a bug from libpbf. This behavior doesn't make sense.

However, to avoid to use that lib, I made a patch. I can't reproduce with Fedora 31, but if somebody is able to test:

Please change the content of your file for Jami in /etc/yum.repos.d/ (generally ring-nightly.repo)
In that file. Replace "nightly", by "internal"
I built a patched version just for you. So, you need to update (dnf update) and then, after opening Jami check the about page to see if the version is built on April 14. (or if it crashes, look at the "Jami GNOME client version:")
Ping me if it's working (or not)
Change the .repo file again to use nightly channel :)

Thank you for your help

many thanks Sébastien, I updated the repo and did the following

sudo dnf remove jami
sudo rm /usr/lib64/qt5/plugins/imageformats/libpdf.so
sudo dnf remove  qt5-qtimageformats
sudo dnf install  qt5-qtimageformats
sudo dnf install jami
jami

It now works well and I had a good video call with it. I can't get echo cancelling to work I expect that is the pulse sound system. Many thanks again. If you can't reproduce then it may be because it is fedora 31 cinnamon https://spins.fedoraproject.org/cinnamon/

In fact with libpbf and without needing qt5-qtimageformats it should work without any problem.

And indeed pulse manage the echo-canceller. A software echo-canceller is in dev, but this has drawbacks too.

Ok, so I close this. I generated a new nightly. Should come in 1 hour (or max 5 hours, depending the order of the distributions built)

Thank you for the feedback.

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[SIGABRT] QFontDatabase: Must construct a QGuiApplication before accessing QFontDatabase

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