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Created attachment 15694 [details]
text from output window
I updated my app to use XF 22.214.171.124-pre2, but now I get the "Recursive entry to executePendingTransactions" exceptions every time I try to navigate. With the old version (2.1) I only got it sometimes and with 126.96.36.19908-pre3 I didn't see it at all.
My MainPage is a MasterDetailPage (MasterBehavior=Split) with NavigationPage for both Master and Detail. And my app uses AppCompat. On a phone, this is different, but I'm only testing on the tablet now.
The Master shows a ListView and when the user taps an item, then a new page is pushed to the Master navigation. OnAppearing of that new page in the Master I replace the whole navigation stack of the detail with a new page. I.e. I call InsertPageBefore to insert the new page at the beginning and then do a PopToRootAsync.
This results in an IllegalStateException: Recursive entry to executePendingTransactions
I attached all the text from my output window including the stack trace of the exception at the very end. The stack trace includes Xamarin.Forms.Platform.Android.AppCompat.NavigationPageRenderer.OnPopToRootAsync, so it appears that it happens in my master page's OnAppearing event where I call this method:
public static async Task NavigateDetailTo(ViewModel viewModel, bool focusDetail)
var mainPage = MainPage;
var md = mainPage as MasterDetailPage;
if(md != null)
var detailNav = md.Detail.Navigation;
var currentRoot = detailNav.NavigationStack;
var currentVM = currentRoot.BindingContext;
if (currentVM == null || currentVM.GetType() != viewModel.GetType())
var newPage = ViewFactory.CreatePage(viewModel);
currentRoot.BindingContext = viewModel;
if(detailNav.NavigationStack.Count > 1)
The output also shows that the app hangs when I try to build my MasterDetailPage with many thread/GC problems, but I'll open a separate bug for that.
I'll try to make a repro project for this bug and attach it when it is finished.
Created attachment 15696 [details]
repro project with XF 2.2
This repro project uses XF 188.8.131.52. The exception happens every time you tap an item in the ListView in the Master.
Created attachment 15697 [details]
repro project with XF 184.108.40.20629
This project uses the exact same code as the others, but it uses XF 220.127.116.1129. The exception comes sometimes when going back.
Created attachment 15698 [details]
repro project with XF 18.104.22.16808
This project also uses the exact same code, but XF 22.214.171.12408.
Navigation works as expected. There is no exception.
This is the same exception as in https://bugzilla.xamarin.com/show_bug.cgi?id=39403 although that was said to be fixed in 2.2.0-pre1. Well, maybe in case of a TabbedPage, but not with a MasterDetailPage.
*** Bug 40639 has been marked as a duplicate of this bug. ***
I now checked with XF 126.96.36.199 and 188.8.131.52-pre2 - still the same problem.
I would look at this myself, but unfortunately bug #39403 was fixed before XF was open sourced and thus I don't see what has been changed for that. Apparently those changes fixed the same exception for a TabbedPage but made it worse in my situation.
We have a fix in for this problem; it will be available in an upcoming release.
Should be fixed in 2.3.1-pre1
I have checked this issue with Xamarin.Forms 2.3.1-pre1 and used sample project attached in comment #1 and observed that its working fine.
Hence closing this issue.
Yes, looks good so far. Thank you!