OpenFileDialog undefined behavior on linux-distros

[flexxxxer]

OpenFileDialog behavior differs from distro to distro. Tested on 4 different distros on different run configs.

Computer configuration:

• Ryzen 7 1800x
• RX 5600 XT
• 24 gb ram

.net core version: 3.1

App publishing options:

• Win->Lin: Published from windows to linux
• Lin->Lin: Published from linux to linux

Publish command for Win->Lin and Lin->Lin: dotnet publish -r linux-x64 -c Release /p:PublishSingleFile=true

App used for testing: link

Testing paths:

1. File selected
   Expected behavior – OpenFileDialog.ShowAsync() returning array with one item – path to file.
2. File selected canceled
   Expected behavior - OpenFileDialog.ShowAsync() returning array without items (but array is not nullable)
   Expected program behavior: On button click, shows up a file select dialog. If file is selected the expected behavior is: Shows up a messagebox with file path If canceled: Shows up an empty messagebox.
   If ShowAsync() path returned is null it transforms to string containing null If ShowAsync() returned null array messagebox dialog shows up with exception

Below are testing results

Kernel dumps: googledrive
Doesn't load because of that: link

Ubuntu 20.04

Kernel version: 5.4.0-40-generic
Display Manager: Gnome 3.36.1
Display Server: X11

app build option	file manager	opened	opened canceled
Win->Lin	Nautilus 3.36.1-stable	Behavior normal	Behavior abnormal (null instead of empty array)
Lin->Lin	Nautilus 3.36.1-stable	Doesn’t load	Doesn't load

Fedora 32 Workstation Edition

Kernel version: 5.6.6-300.fc32.x86_64
Display Manager: Gnome 3.36.1
Display Server: Wayland

app build option	file manager	opened	opened canceled
Win->Lin	Nautilus 3.36.1-f0a929d	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Nautilus 3.36.1-f0a929d	Doesn’t load	Doesn't load

OpenSUSE Thumbleweed 20200716

Kernel version: 5.7.7-1-default
Display Manager: KDE
Display Server: X11

app build option	file manager	opened	opened canceled
Win->Lin	Dolphin 20.04.3	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Dolphin 20.04.3	Doesn’t load	Doesn't load
Win->Lin	Nautilus 3.36.3-stable	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Nautilus 3.36.3-stable	Doesn’t load	Doesn't load
Win->Lin	Thunar 1.8.15	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Thunar 1.8.15	Doesn’t load	Doesn't load

Manjaro 20.0.3 Lysia

Kernel version: 5.7.0, 5.6.16, 5.4.44
Display Manager: KDE
Display Server: X11

app build option	file manager	kernel version	opened	opened canceled
Win->Lin	Dolphin 20.04.1	5.7.0	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Dolphin 20.04.1	5.7.0	Doesn’t load	Doesn't load
Win->Lin	Nautilus 3.36.3-efc97f8a9	5.7.0	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Nautilus 3.36.3-efc97f8a9	5.7.0	Doesn’t load	Doesn’t load
Win->Lin	Thunar 1.8.15	5.7.0	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Thunar 1.8.15	5.7.0	Doesn’t load	Doesn’t load
Win->Lin	Dolphin 20.04.1	5.6.16	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Dolphin 20.04.1	5.6.16	Doesn’t load	Doesn't load
Win->Lin	Nautilus 3.36.3-efc97f8a9	5.6.16	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Nautilus 3.36.3-efc97f8a9	5.6.16	Doesn’t load	Doesn’t load
Win->Lin	Thunar 1.8.15	5.6.16	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Thunar 1.8.15	5.6.16	Doesn’t load	Doesn’t load
Win->Lin	Dolphin 20.04.1	5.4.44	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Dolphin 20.04.1	5.4.44	Doesn’t load	Doesn't load
Win->Lin	Nautilus 3.36.3-efc97f8a9	5.4.44	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Nautilus 3.36.3-efc97f8a9	5.4.44	Doesn’t load	Doesn’t load
Win->Lin	Thunar 1.8.15	5.4.44	Segmentation fault (core dumped)	Segmentation fault (core dumped)
Lin->Lin	Thunar 1.8.15	5.4.44	Doesn’t load	Doesn’t load

Currently on most of the distros OpenFileDialog leads to segfault

[kekekeks]

Segfaults are most likely caused by leaked libfreetype symbols from libSkiaSharp. It used to work until distros have rolled a new libfreetype version, so everything began segfaulting.

Consider using managed file dialogs or switching to 0.10-preview.

Also, SFX-archive publishing isn't a supported by our team, so if the problem doesn't occur without PublishSingleFile=true, it should be reported to dotnet/runtime

[kekekeks]

You can also try to switch to a newer build of SkiaSharp linux library by adding

<ItemGroup>
    <PackageReference Include="SkiaSharp.NativeAssets.Linux" Version="1.68.3" />
    <PackageReference Include="Avalonia.Skia.Linux.Natives" Version="1.68.0.2" ExcludeAssets="all" />
    <PackageReference Include="SkiaSharp" Version="1.68.3" />
</ItemGroup>

to your project (exactly those lines without changes)

[flexxxxer]

Yes, changing SkiaSharp version helped, the application works as on ubuntu, tanks. But the problem with null aray is still there (Windows doesn't have that problem, instead of null array it is empty)

When 0.10-preview will be availble in nuget?

[kekekeks]

But the problem with null aray is still there

Yes, that inconsistency needs to be fixed.

When 0.10-preview will be availble in nuget?

https://www.nuget.org/packages/Avalonia/0.10.0-preview1