System.Runtime.Caching.MemoryCacheStatistics.SetTrimStats DivideByZeroException

[StephenMolloy]

From VS Feedback for .Net 4.5.2 - https://developercommunity.visualstudio.com/content/problem/539608/net-452-systemruntimecachingmemorycachestatisticss.html

1. private readonly MemoryCache messageStore = new MemoryCache("Message Store");
2. Thread 1: this.messageStore.Add(messageId, message, new CacheItemPolicy { AbsoluteExpiration = DateTimeOffset.UtcNow.AddMinutes(5), RemovedCallback = arguments => { if (arguments.RemovedReason == CacheEntryRemovedReason.Expired) { // Logging ... } } })
3. Timer Thread (System.Threading.Timer):this.messageStore.GetCount();
4. Thread 2: this.messageStore.Get
5. Thread Pool (TPL): this.messageStore.Remove

System.DivideByZeroException: Es wurde versucht, durch 0 (null) zu teilen. bei System.Runtime.Caching.MemoryCacheStatistics.SetTrimStats(Int64 trimDurationTicks, Int64 totalCountBeforeTrim, Int64 trimCount) bei System.Runtime.Caching.MemoryCacheStatistics.CacheManagerThread(Int32 minPercent) bei System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) bei System.Threading.TimerQueueTimer.CallCallback() bei System.Threading.TimerQueueTimer.Fire() bei System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() bei System.Threading.ThreadPoolWorkQueue.Dispatch()

[danmoseley]

@KKhurin?

[KKhurin]

Steve and I talked about this - this is a copy/paste bug that made is all the way from System.Web.Caching. Steve is the new owner of S.R.Caching so he'll come up with ways to fix it in as many products as possible (or at least find workarounds).

[danmoseley]

Thanks @KKhurin and I see he even updated area owner.

[danmoseley]

cc @karelz to update his bug reminder tool.