[MonoDevelop] MD segfault

[Matt Calder]

I recently posted about MD dieing suddenly. I tried catching output by
running it from a terminal, but it is not clear that that output is
relevant to diagnosing the problem. However, the last two times it died, I
got a pop-up window telling me there was an error and it has a stack trace:

System.NullReferenceException: Object reference not set to an instance of
an object
  at MonoDevelop.Projects.Dom.MethodResolveResult.IsCompatible (IReturnType
baseType, IReturnType type) [0x00039] in
/home/calder/tmp/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Dom/ResolveResult.cs:508

  at MonoDevelop.Projects.Dom.MethodResolveResult.get_MostLikelyMethod ()
[0x000ee] in
/home/calder/tmp/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Dom/ResolveResult.cs:451

  at MonoDevelop.CSharp.Resolver.TextEditorResolverProvider.CreateTooltip
(MonoDevelop.Projects.Dom.Parser.ProjectDom dom, ICompilationUnit unit,
MonoDevelop.Projects.Dom.ResolveResult result, System.String
errorInformations, MonoDevelop.Projects.Dom.Output.Ambience ambience,
ModifierType modifierState) [0x0018d] in
/home/calder/tmp/monodevelop/main/src/addins/CSharpBinding/MonoDevelop.CSharp.Resolver/TextEditorResolverProvider.cs:331

  at MonoDevelop.SourceEditor.LanguageItemWindow..ctor
(MonoDevelop.SourceEditor.ExtensibleTextEditor ed, ModifierType
modifierState, MonoDevelop.Projects.Dom.ResolveResult result, System.String
errorInformations, ICompilationUnit unit) [0x00031] in
/home/calder/tmp/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/LanguageItemWindow.cs:53

  at
MonoDevelop.SourceEditor.LanguageItemTooltipProvider.CreateTooltipWindow
(Mono.TextEditor.TextEditor editor, Int32 offset, ModifierType
modifierState, Mono.TextEditor.TooltipItem item) [0x0008e] in
/home/calder/tmp/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/LanguageItemTooltipProvider.cs:70

  at Mono.TextEditor.TextEditor.TooltipTimer () [0x00129] in
/home/calder/tmp/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/TextEditor.cs:2462

  at GLib.Timeout+TimeoutProxy.Handler () [0x0000c] in
/home/calder/tmp/gtk-sharp/glib/Timeout.cs:70

It offers me the choice to upload it to Xamarin, when I click that it dies
so I am sending the trace here. As it happens, I rebuilt MD from master
today between the first time the error happened and the last time (the one
generating the trace above). I hope this helps. Having MD die three or four
times a day is like having a cold, it won't kill me, but life is not good.

Matt
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