[Crash] System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. (org.freedesktop.DBus.Error.ServiceUnknown: The name com.canonical.AppMenu.Registrar was not provided by any .service files)

[nARN]

System

UVtools v5.0.2 X64
Operative system: Ubuntu 24.04.1 LTS X64
Processor: Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz
Processor cores: 16
Memory RAM: 20.79 / 125.73 GB
Runtime: linux-x64
Framework: .NET 9.0.0
AvaloniaUI: 11.2.3
OpenCV: 4.9.0

Path:       /tmp/.mount_uvtoolV1z0pR/usr/bin/
Executable: /tmp/.mount_uvtoolV1z0pR/usr/bin/UVtools

Printer and Slicer

No response

Description of the bug

System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. (org.freedesktop.DBus.Error.ServiceUnknown: The name com.canonical.AppMenu.Registrar was not provided by any .service files)
 ---> Tmds.DBus.Protocol.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name com.canonical.AppMenu.Registrar was not provided by any .service files
   at Tmds.DBus.Protocol.DBusConnection.MyValueTaskSource`1.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)
   at Tmds.DBus.Protocol.DBusConnection.CallMethodAsync(MessageBuffer message)
   at Tmds.DBus.Protocol.Connection.CallMethodAsync(MessageBuffer message)
   --- End of inner exception stack trace ---
Category: Task
File: 1200prc_0.05mm.encrypted.ctb  [Version: 5] [Class: CTBEncryptedFile]

Machine date time: 20/12/2024 14:51:51
    UTC date time: 20/12/2024 14:51:51

How to reproduce

I struggle to reproduce it, so suspect it may be some sort of a race. When I got this exception I had just reloaded a file and went straight into "Edit print parameters". It works fine now, but on DBus I can still see calls to com.canonical.AppMenu.Registrar and errors in response:

method call time=1734709363.187768 sender=:1.302 -> destination=com.canonical.AppMenu.Registrar serial=295 path=/com/canonical/AppMenu/Registrar; interface=com.canonical.AppMenu.Registrar; member=RegisterWindow
   uint32 41943155
   object path "/net/avaloniaui/dbusmenu/1032ada03730481484f5810ae4363f30"
error time=1734709363.187791 sender=org.freedesktop.DBus -> destination=:1.302 error_name=org.freedesktop.DBus.Error.ServiceUnknown reply_serial=295
   string "The name com.canonical.AppMenu.Registrar was not provided by any .service files"

so I'm suspecting that the problem is that for some reason the exception was not caught at that time.

Files

No response

[github-actions]

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[sn4k3]

This comes from UI Framework, and other more have this problem: https://github.com/sn4k3/UVtools/issues?q=DBus
I don't know how to resolve it as it come from external source, and it's rare: https://github.com/AvaloniaUI/Avalonia/issues?q=org.freedesktop.DBus.Error.UnknownMethod

AvaloniaUI/Avalonia#17616
I'm gona ask to Avalonia...

[diefans]

for me this errors occurs since I use version 5.0.2...

[sn4k3]

Because v5 uses latest avalonia. If you revert to latest v4 it won't trigger this error.

[JoveToo]

It's really not rare with UVTools.

[Eisenknochen]

same problem here (Using Linux Mint)

[sn4k3]

Is this fixed with latest release?

[JKBert]

Nope. I've just tested (Linux Devuan).

[sn4k3]

Dam, I tested on VM and works ok. Ubuntu as OP using.
What is the most easy way to reproduce this?

[DodoidOfficial]

I can confirm I am also running into this on Debian Testing (Trixie) w/ KDE. What seems to trigger it most consistently is to attempt to hover over the stats in the bottom bar (e.g. Wait Time). The tooltip will flash up a couple of times (but is seemingly empty?), and UVtools usually crashes after a few seconds of this.

Edit: Upon some further testing, this is not hard to reproduce at all for me. About half of the buttons in the UI appear to trigger this, every time. My usual workflow (just converting from PrusaSlicer to a CTB file) doesn't usually hit it, but if you actually want to use any of UVtools's features other than that, it's difficult to go more than a minute or two without hitting it.

[sn4k3]

Check last version

[DodoidOfficial]

This now appears to work for me, both in the release version and building from source. The contents of the tooltip still are not visible, and the tooltip still disappears immediately after appearing, but it no longer seems to crash for me.

[sn4k3]

Yes, bug still there, is just ignored

vmware_2025-03-10_03-44-08.mp4