[Bug] Crash when a new notification is sent

[zjeffer]

Describe the bug Segfaults when a notification is sent.

To Reproduce Steps to reproduce the behavior:

1. Run swaync
2. Send a notification (I did it by running spotify and going to the next song)

I also managed to reproduce it by simply running notify-send hello, but the below logs and backtraces are created with a spotify notification.

Expected behavior It shows the notification without crashing.

Please provide logs if you're experiencing notification errors / bugs gdb backtrace when built from source with G_MESSAGES_DEBUG=all: https://gist.github.com/zjeffer/45bc48dd7c7e5550655f18b2e9d82f84,

Desktop (please complete the following information):

• OS: Arch Linux (Kernel 6.9.5-arch1-1)
• WM: Hyprland (4168b8c17b12b90873fab1ca73c2981b53f48bf5)
• glib2 2.80.3-2
• libnotify 0.8.3-1

It happens with both the swaync-git AUR package and building from source.

[ErikReider]

Seems like a GTK 3 issue? I'm running a later version on my machine, and it runs just fine. Try rebuilding?

[zjeffer]

Still happening after recompiling latest git commit.

My installed versions of GTK (all installed through pacman)

• gtk2 2.24.33
• gtk3 3.24.43
• gtk4 4.14.4

Which GTK3 version are you using?

[ErikReider]

Hmm, the same versions… It segfaults when constructing the notification for some reason...

[zjeffer]

Yeah, seems to happen somewhere in the HdyCarousel object deep in GTK, where at some point the widget is a nullptr. I'm not familiar with Vala or GTK so I haven't really been able to figure out where exactly it goes wrong.

[zjeffer]

When you run swaync with G_MESSAGES_DEBUG=all, what do you get as output when a new notification is sent? This is mine when I execute notify-send hello:

** (swaync:953129): DEBUG: 17:05:15.898: notiDaemon.vala:171: Notification: 
category:		(null)
image_data:		false
expire_timeout:		-1
replaces_id:		0
desktop_entry:		(null)
body:			
app_icon:		
action_icons:		false
time:			1722179115
hints:		
	sender-pid: int64 953250
	urgency: byte 0x01
applied_id:		1
image_path:		(null)
inline-reply:		(null)
app_name:		notify-send
summary:		hello
icon_data:		false
resident:		false
default_action:		(null)
actions:		
urgency:		Normal

[1]    953129 segmentation fault (core dumped) G_MESSAGES_DEBUG=all ./build/src/swaync

[zjeffer]

This is still happening btw :cry:

[zjeffer]

I notice it doesn't happen on my work laptop, which is also running Hyprland (on Ubuntu). I'll investigate what's different about my personal laptop to see why it's happening.

[zjeffer]

Found it: I had an older version of gtk installed in /usr/local/lib/. Deleting all libgtk*.so* and libgdk*.so* files fixed the issue.

I found it by running swaync through gdb, making the segfault happen by sending a notification, and then checking info sharedlibrary. It found:

0x00007ffff6a90fb0  0x00007ffff6ff1088  Yes         /usr/local/lib/libgtk-3.so.0
0x00007ffff68f3130  0x00007ffff69a80af  Yes         /usr/local/lib/libgdk-3.so.0