Title: EXC_BAD_ACCESS crash on iOS when dynamically removing Border views — regression in Microsoft.Maui.Controls 10.0.30, possibly earlier

[JohnHDev]

Description

Upgrading Microsoft.Maui.Controls from 9.0.120 to 10.0.30 introduces a reproducible EXC_BAD_ACCESS (SIGSEGV) crash on physical iOS devices, occasionally on sim. Reverting to 9.0.120 eliminates the crash entirely.

Steps to Reproduce

Using a custom layout control where views can be moved, updated, added. When being removed 90% of the time this exception is thrown. Only on physical device.

Expected: Views are disposed cleanly when removed from the visual tree.

Actual: EXC_BAD_ACCESS on the finalizer thread — managed NSObject wrapper outlives the freed native ObjC CALayer.

I spent a lot of tokens trying to resolve this, then had the brainwave to revert the nuget packages. Can provide a symbolicated crash log if that helps.

Link to public reproduction project repository

No response

Version with bug

10.0.30

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

9.0.120 SR12

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

[MihuBot]

I'm a bot. Here is a possible duplicate issue (I may be wrong):

• [iOS] MauiCALayer and StaticCAShapeLayer crash on finalizer thread in Release/AOT builds #33800

[TamilarasanSF4853]

This issue has been validated in Visual Studio Code 1.109.4 with MAUI version 10.0.41. It is not reproduced on the iOS simulator from our end.

BorderViewIssue.zip

[dotnet-policy-service]

Hi @@JohnHDev. We have added the "s/needs-info" label to this issue, which indicates that we have an open question for you before we can take further action. 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.

[dotnet-policy-service]

Hi @@JohnHDev. 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.