Many Controls end up preventing Garbage Collection

[michaelstonis]

Description

We have noticed across multiple applications that memory pressure consistently increases until crashing. It appears that this is, in part, related to certain controls not allowing a page to be garbage collected which then has rippling effects (view models, data models, etc.) that prevent any additional objects on that page to be collected.

I've tested this against Android and iOS and the controls that consistently seem to not allow GC are the following:

• ActivityIndicator
• Border
• BoxView
• ImageButton
• Slider
• Stepper
• Switch
• TableView
• ListView (Not in Example)
• CollectionView (Not in Example)

2023-12-27_20-39-20.mp4

Video shows examples of creating controls adding them as the only control on a page, navigating from the page and invoking the GC.

Steps to Reproduce

1. Click "Go to Page"
2. Select one of the controls listed
3. Navigate back to the home page
4. Click "Cleanup"
5. Observe the console output window for messages like GCed page with {Name of View}

Link to public reproduction project repository

Reproduction Repository

Version with bug

8.0.3

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android, I was not able test on other platforms

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

No response

[ghost]

Hi @michaelstonis. We have added the "s/needs-repro" label to this issue, which indicates that we require steps and sample code to reproduce the issue before we can take further action. Please try to create a minimal sample project/solution or code samples which reproduce the issue, ideally as a GitHub repo that we can clone. See more details about creating repros here: https://github.com/dotnet/maui/blob/main/.github/repro.md

This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[drasticactions]

You listed an example but didn't link it. Could you link it please?

[drasticactions]

Also, my guess is that this is a duplicate of #18365, which covers the same topic.

[michaelstonis]

@drasticactions sorry about that. Link updated and provided here https://github.com/michaelstonis/MauiCleanTest.

I think that this is the same/similar as #18365 I had not found that one when searching before posting this though. The only difference, if anything, is that I am seeing it on iOS, Mac Catalyst, and Android.

[dotnet-policy-service]

Hi @michaelstonis. We have added the "s/try-latest-version" label to this issue, which indicates that we'd like you to try and reproduce this issue on the latest available public version. This can happen because we think that this issue was fixed in a version that has just been released, or the information provided by you indicates that you might be working with an older version.

You can install the latest version by installing the latest Visual Studio (Preview) with the .NET MAUI workload installed. If the issue still persists, please let us know with any additional details and ideally a reproduction project provided through a GitHub repository.

This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[Zhanglirong-Winnie]

Verified this issue with Visual Studio 17.6.10(build428) (8.0.14). Not repro this issue with sample project.