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See attached project. This hit the profiler.
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>
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
Created attachment 10556 [details]
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 18.104.22.1681 (Business Edition)
Screencast : http://www.screencast.com/t/RfKrplbI