Bug 28505 - NSTabView.Delegate isn't holding on to reference correct on new ref count
Summary: NSTabView.Delegate isn't holding on to reference correct on new ref count
Alias: None
Product: Xamarin.Mac
Classification: Desktop
Component: Library (Xamarin.Mac.dll) ()
Version: 1.12.0
Hardware: PC Mac OS
: High normal
Target Milestone: 2.0.x
Assignee: Rolf Bjarne Kvinge [MSFT]
Depends on:
Reported: 2015-03-27 16:26 UTC by Chris Hamons
Modified: 2015-04-17 11:29 UTC (History)
4 users (show)

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

Repro (14.47 KB, application/zip)
2015-03-30 10:49 UTC, Chris Hamons

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Description Chris Hamons 2015-03-27 16:26:47 UTC
See attached project. This hit the profiler.
Comment 1 Chris Hamons 2015-03-27 16:28:12 UTC
If you run it with new ref count, click the button and then swap tabs it will die.

If you change it to be

	x = new MyDel ();
        v.Delegate = x;

it does not die.

Loaded assembly: /Users/donblas/Programming/Local/NSTabViewDelegateBug/NSTabViewDelegateBug/bin/Debug/NSTabViewDelegateBug.app/Contents/MonoBundle/Xamarin.Mac.dll [External]
Loaded assembly: /Users/donblas/Programming/Local/NSTabViewDelegateBug/NSTabViewDelegateBug/bin/Debug/NSTabViewDelegateBug.app/Contents/MonoBundle/System.dll [External]
Loaded assembly: /Users/donblas/Programming/Local/NSTabViewDelegateBug/NSTabViewDelegateBug/bin/Debug/NSTabViewDelegateBug.app/Contents/MonoBundle/System.Net.Http.dll [External]
Loaded assembly: /Users/donblas/Programming/Local/NSTabViewDelegateBug/NSTabViewDelegateBug/bin/Debug/NSTabViewDelegateBug.app/Contents/MonoBundle/NSTabViewDelegateBug.exe
<NSTabViewItem '': 0x600000102760>

  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) AppKit.NSApplication.NSApplicationMain (int,string[]) <IL 0x00093, 0xffffffff>
  at AppKit.NSApplication.Main (string[]) [0x00041] in /Users/donblas/Programming/xamcore/src/AppKit/NSApplication.cs:106
  at NSTabViewDelegateBug.MainClass.Main (string[]) [0x00007] in /Users/donblas/Programming/Local/NSTabViewDelegateBug/NSTabViewDelegateBug/Main.cs:12
  at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>

Native stacktrace:

Debug info from gdb:

(lldb) command source -s 0 '/tmp/mono-gdb-commands.33dief'
Executing commands in '/private/tmp/mono-gdb-commands.33dief'.
(lldb) process attach --pid 44693
Comment 2 Chris Hamons 2015-03-30 10:49:19 UTC
Created attachment 10556 [details]
Comment 3 Rolf Bjarne Kvinge [MSFT] 2015-03-30 13:20:56 UTC

maccore/master: 918244e7fbc09c5f69f6dfc949b5c4ee88fc6ce4
maccore/macios-cycle5: 86e7cb57cb671d5a194d7c1f910c270a11af13aa
Comment 4 Udham Singh 2015-04-17 11:29:00 UTC
I have checked this issue with the help of sample app given in comment 2 and instructions provided in comment 1, and observed that now app does not die. Hence I am closing this issue.

Environment Info : 

Mac OS X 10.9.5
Xamarin Studio 5.9 (build 430)
Mono 4.0.0 ((detached/c8db1b0)
GTK+ 2.24.23 (Raleigh theme)
Xcode 6.2 (6776)
Xamarin.Mac (Business Edition)

Screencast : http://www.screencast.com/t/RfKrplbI