A combination of Cast and Slice leads to AccessViolationException

[mahalex]

Describe the bug

The following code throws System.AccessViolationException:

            int height = 720;
            int width = 1280;
            byte[] storage = new byte[width * height * sizeof(int)];
            Memory2D<int> data = storage
                .AsMemory()
                .Cast<byte, int>()
                .AsMemory2D(height: height, width: width);
            Memory2D<int> slice = data.Slice(
                row: height / 2,
                column: 0,
                height: height / 2,
                width: width);
            int total = 0;
            foreach (int v in slice.Span)
            {
                total += v;
            }

Regression

No response

Steps to reproduce

Create a project targeting net7.0, paste the above code into the `Main` method, run it.

Expected behavior

The code is supposed to calculate a sum of all values in the slice (in this case, 0).

Screenshots

IDE and version

VS 2022

IDE version

17.4.4

Nuget packages

• CommunityToolkit.Common
• CommunityToolkit.Diagnostics
• CommunityToolkit.HighPerformance
• CommunityToolkit.Mvvm (aka MVVM Toolkit)

Nuget package version(s)

8.2.0

Additional context

The problem disappears when there's no Cast() (so, we are summing over a Span of bytes). It also disappears when there's no Slice() (so, we are summing over data instead of slice).

Help us help you

No, just wanted to report this

[Sergio0694]

Good catch!! Thank you 😄

[ChristophLindemann]

@Sergio0694 when will this be released?

[ChristophLindemann]

@Sergio0694 do you have some ETA of when this will be released? I can see you added it to 8.2.1, but I could not find a planned/estimated release date for that?

It's just so I can decide if I should implement a workaround for this, or if I can wait for 8.2.1.

[Sergio0694]

I don't have an exact ETA just yet, but tentatively I'd say probably around the first half of June or so?
Can you use a nightly package from main in the meantime? The feed is this one:
https://pkgs.dev.azure.com/dotnet/CommunityToolkit/_packaging/CommunityToolkit-MainLatest/nuget/v3/index.json

[ChristophLindemann]

I guess, I could use one of the nightly builds for now.

I will use 8.2.1-build.2

Thanks