Exception of type 'System.OutOfMemoryException' was

There's another thread that talks about this problem, but it seems to have run dead so I'd like to bring this up again.

This morning we were working on our Sitefinity site, on the master pages in particular. We were struggling to disable the CSS files rendered out by the Telerik controls, but we eventually figured it out.
Then we moved our theme files into the new folder structure under App_data as suggested by Telerik. We followed the instructions to configure the new theme under the administration section, created a new template and applied the new theme to the template.

Everything worked well, but then suddenly the application started crashing. We monitored the server memory and noticed a serious problem with the worker process memory consumption. From the rate at which it swallows up memory (up to 2Gb within 5-10 seconds) it would seem like some kind of infinite loop. What doesn't make sense though is why?

The Sitefinity and Windows event log list the following:

Hello,

It seems that we have the same kind of error than you !

[OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.]
   System.Collections.Generic.List`1.set_Capacity(Int32 value) +62
   System.Collections.Generic.List`1.EnsureCapacity(Int32 min) +34
   System.Collections.Generic.List`1.Add(T item) +54
   Telerik.Sitefinity.Modules.Pages.PageHelperImplementation.GetTemplates(PageNode pageNode) +66
   Telerik.Sitefinity.Web.PageSiteNode.LoadPageData() +579
   Telerik.Sitefinity.Web.PageSiteNode.get_Visible() +9
   Telerik.Sitefinity.Web.UI.NavigationControls.InnerPageSiteNode.get_Visible() +18
   Telerik.Sitefinity.Web.RouteHelper.CheckSiteMapNode(SiteMapNode pageSiteMapNode) +298
   Telerik.Sitefinity.Web.UI.NavigationControls.SitefinitySiteMapDataSource.CheckNode(SiteMapNode node) +68
   Telerik.Sitefinity.Web.UI.NavigationControls.SitefinitySiteMapDataSource.FilterNodes(SiteMapNodeCollection nodes, Boolean modifyCollection) +373
   Telerik.Sitefinity.Web.UI.NavigationControls.Helper.FilterChildNodes(SiteMapNode node, SitefinitySiteMapDataSource dataSource) +325
   Telerik.Sitefinity.Web.UI.NavigationControls.InnerPageSiteNode.get_ChildNodes() +29
   Telerik.Sitefinity.Web.UI.NavigationControls.SitefinitySiteMapDataSource.GetNodes(SiteMapNode node) +68
   Telerik.Sitefinity.Web.UI.NavigationControls.SitefinitySiteMapDataSource.GetNodes() +352
   Telerik.Sitefinity.Web.UI.NavigationControls.SitefinitySiteMapDataSource.GetPathNodeCollection(String viewPath) +46
   Telerik.Sitefinity.Web.UI.NavigationControls.SitefinitySiteMapDataSource.GetView(String viewName) +40
   System.Web.UI.WebControls.SiteMapDataSource.System.Web.UI.IDataSource.GetView(String viewName) +10
   System.Web.UI.WebControls.ReadOnlyDataSource.System.Web.UI.IDataSource.GetView(String viewName) +8809165
   System.Web.UI.WebControls.DataBoundControl.ConnectToDataSourceView() +266
   System.Web.UI.WebControls.DataBoundControl.OnLoad(EventArgs e) +19
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Control.LoadRecursive() +146
   System.Web.UI.Control.LoadRecursive() +146
   System.Web.UI.Control.LoadRecursive() +146
   System.Web.UI.Control.LoadRecursive() +146
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +9041218
   System.Web.UI.ControlCollection.Add(Control child) +79
   Telerik.Sitefinity.Web.UI.SimpleView.CreateChildControls() +96
   System.Web.UI.Control.EnsureChildControls() +102
   System.Web.UI.Control.PreRenderRecursiveInternal() +42
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2496

Hi,

Hi Stanislav,

The duplicate template seems to have been the problem. It never occurred to me that even though the front end was bombing out within a few seconds that the back end would still work, but it did.

Thanks for the help.

Jacques