Since June 19 we are experiencing unexplained and undesired recycles of Application Pool worker processes. The Application Pool has a scheduled 3am recycle. But since June 19th we are experiencing additional unexplained daily recycles between 5am and 5:30am. We are not yet able to find the cause or trigger. Not in the IIS Admin settings nor in the Event Logs nor in the Task Scheduler.
We luckily do have a call stack of the recycle, sent by email of IIS Admin:
Current StackTrace (max 30 frames deep):
0. ezWeb.Global_asax.Application_End()
1. System.RuntimeMethodHandle.InvokeMethod()
2. System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal()
3. System.Reflection.RuntimeMethodInfo.Invoke()
4. System.Reflection.MethodBase.Invoke()
5. System.Web.HttpApplication.InvokeMethodWithAssert()
6. System.Web.HttpApplication.ProcessSpecialRequest()
7. System.Web.HttpApplicationFactory.FireApplicationOnEnd()
8. System.Web.HttpApplicationFactory.Dispose()
9. System.Web.HttpRuntime.Dispose()
10. System.Web.HttpRuntime.ReleaseResourcesAndUnloadAppDomain()
11. System.Threading.ExecutionContext.RunInternal()
12. System.Threading.ExecutionContext.Run()
13. System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
14. System.Threading.ThreadPoolWorkQueue.Dispatch()
Where should we further search for the cause, the trigger of this recycle?
