Bug 42658 - App crashing xamarin_initialize when load storyboard
Summary: App crashing xamarin_initialize when load storyboard
Alias: None
Product: iOS
Classification: Xamarin
Component: General ()
Version: master
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Sebastien Pouliot
Depends on:
Reported: 2016-07-19 14:15 UTC by Luca
Modified: 2016-11-11 16:11 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

Crash log I Found on iPhone 6 (39.81 KB, text/rtf)
2016-07-19 14:15 UTC, Luca

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Description Luca 2016-07-19 14:15:58 UTC
Created attachment 16714 [details]
Crash log I Found on iPhone 6

Hi all,

It seems Mono runtime crash at app start. It not happens always and not in all device I can test.

I attach the log I found in the device (in insight there is nothing). The class reported in log (CustomNavController) is defined as:

    using System;
    using UIKit;
    using Foundation;

    namespace TouristApp {
    [Register ("CustomNavController")]
    public class CustomNavController : UINavigationController {

		public CustomNavController(IntPtr handle) : base(handle) { }
		public CustomNavController() { }

		public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations () {
			return  TopViewController.GetSupportedInterfaceOrientations ();

		public override bool ShouldAutorotate () {
			return TopViewController.ShouldAutorotate ();

This extended UINavigationController is call in Storyboard file.

Version of Xamarin studio, ios and Mono are up to date to the last stable version.
Comment 1 Rodrigo Kumpera 2016-07-19 21:30:21 UTC
The app is dying with an unhandled exception in the binding engine.
Comment 2 Luca 2016-07-20 06:57:26 UTC
Thx for the reply. I do not understand: it is a problem of my app or a bug of Xamarin.iOS?
Comment 3 Rodrigo Kumpera 2016-07-20 06:58:29 UTC
Could be either, I'm letting the Xamarin.iOS figure this out.
Comment 4 Rolf Bjarne Kvinge [MSFT] 2016-07-20 08:17:17 UTC
Please get the device log as well (from Xamarin Studio: menu View -> Pads -> iOS Device Log) from a crash, that will give more information about the exception that occurred.
Comment 5 Luca 2016-07-20 10:35:33 UTC
I'm sorry I have only the log of the app. On the device I uninstall and reinstall the app and it works, so I cannot reproduce the crash on the same device.
In both case it is a fresh install of the app.

As I said it happens a few times and not on all device.
Comment 6 Rolf Bjarne Kvinge [MSFT] 2016-07-20 10:38:43 UTC
This could be an issue where the app wasn't built properly, so the exception you're seeing would be because the storyboard was missing/incorrect, but without more details about the exception it's impossible to diagnose further.

So could you get the device log if you run into this again?
Comment 7 Luca 2016-07-20 10:52:20 UTC
Of course next time I try to get also the device log. Thanks for the support. Could you leave this bug report open?
Comment 8 Rolf Bjarne Kvinge [MSFT] 2016-07-20 10:53:46 UTC
Yes, we can leave it open for a while.
Comment 9 Sebastien Pouliot 2016-11-11 16:11:47 UTC
We have not received any additional information. If you are still experiencing this issue please provide all the requested information and re-open the bug report. Thanks!