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We recently upgraded our Windows Server from 2012 to 2022. We are now experiencing App Pool crashes with IIS hosted applications running .NET 4.6. The crashes require us to stop the application pool, terminate the w3wp.exe task manually for that application pool and then restart the application pool in IIS. None of our .NET Core applications seem to have this problem. We upgraded one of the older applications to .NET 4.8 but that didn't help either. We also still have an old Windows 2012 server that does not present any of these crashes with the same applications.
We were able to generate a dump file before terminating w3wp task and run it in DebugDiag. I'm seeing multiple counts of the System.ObjectDisposedException so we may be having an issue with garbage collection. I also see several others like StackOverflow and OutOfMemory but the ObjectDisposedException may be the cause of those.
I'd appreciate any help. Thanks.
Previous .NET Exceptions Report (Exceptions in all .NET Heaps)
Exception TypeCountMessageStack Trace__System.Exception__1<none>;__System.OutOfMemoryException__1<none>;__System.StackOverflowException__1<none>;__System.ExecutionEngineException__1<none>;__System.Threading.ThreadAbortException__2<none>;__System.ObjectDisposedException__4Cannot access a disposed object.;
I can post the full DebugDiag output but looking further I have 44 threads that are all waiting:
44 Threads (67% of all threads) have this same call stack. Note: Grouping of identical threads can be disabled in the 'Preferences' tab of the Analysis Options
Thread 17 - System ID 39656
| Entry point | clr!Thread::intermediateThreadProc |
|---|---|
| Entry point | clr!Thread::intermediateThreadProc |
| Create time | 9/23/2024 8:04:32 AM |
| Time spent in user mode | 0 Days 00:00:02.578 |
| Time spent in kernel mode | 0 Days 00:00:00.375 |
This thread is waiting in System.Threading.Monitor.Wait
I think I'm getting closer. I was able to get the call stack and it's waiting for a MySQL connection:
.NET Call Stack
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|[[GCFrame]]|
|[[HelperMethodFrame_1OBJ] (System.Threading.Monitor.ObjWait)] System.Threading.Monitor.ObjWait(Boolean, Int32, System.Object)|
|mscorlib_ni!System.Threading.ManualResetEventSlim.Wait(Int32, System.Threading.CancellationToken)+364|
|mscorlib_ni!System.Threading.Tasks.Task.SpinThenBlockingWait(Int32, System.Threading.CancellationToken)+bb|
|mscorlib_ni!System.Threading.Tasks.Task.InternalWait(Int32, System.Threading.CancellationToken)+1b1|
|mscorlib_ni!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task)+d982a7|
|MySql.Data.MySqlClient.MySqlConnection.Open()+27|
|System.Data.Entity.Infrastructure.Interception.InternalDispatcher1[[System.__Canon, mscorlib]].Dispatch[[System.__Canon, mscorlib],[System.__Canon, mscorlib]](System.__Canon, System.Action2, System.__Canon, System.Action3, System.Action3)+62|
|System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(System.Data.Common.DbConnection, System.Data.Entity.Infrastructure.Interception.DbInterceptionContext)+1ee|
|System.Data.Entity.Core.EntityClient.EntityConnection.Open()+144|
|System.Data.Entity.Core.Objects.ObjectContext.EnsureConnection(Boolean)+a6|
|System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[System.__Canon, mscorlib]+3f|
|[[StubHelperFrame]]|
|System.Data.Entity.Core.Objects.ObjectQuery1+<>c__DisplayClass41_0[[System.__Canon, mscorlib]].b__0()+e3| |System.Data.Entity.Core.Objects.ObjectQuery1[[System.__Canon, mscorlib]].GetResults(System.Nullable1)+165| |System.Data.Entity.Core.Objects.ObjectQuery1[[System.__Canon, mscorlib]]..GetEnumerator>b__31_0()+1e|
|System.Data.Entity.Internal.LazyEnumerator1[[System.__Canon, mscorlib]].MoveNext()+27| |System.Linq.Enumerable.FirstOrDefault[[System.__Canon, mscorlib]](System.Collections.Generic.IEnumerable1)+f6|
I think I'm getting closer. I was able to get the .NET call stack and it's waiting for a MySql connection to open:
.NET Call Stack
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|[[GCFrame]]|
|[[HelperMethodFrame_1OBJ] (System.Threading.Monitor.ObjWait)] System.Threading.Monitor.ObjWait(Boolean, Int32, System.Object)|
|mscorlib_ni!System.Threading.ManualResetEventSlim.Wait(Int32, System.Threading.CancellationToken)+364|
|mscorlib_ni!System.Threading.Tasks.Task.SpinThenBlockingWait(Int32, System.Threading.CancellationToken)+bb|
|mscorlib_ni!System.Threading.Tasks.Task.InternalWait(Int32, System.Threading.CancellationToken)+1b1|
|mscorlib_ni!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task)+d982a7|
|MySql.Data.MySqlClient.MySqlConnection.Open()+27|
|System.Data.Entity.Infrastructure.Interception.InternalDispatcher1[[System.__Canon, mscorlib]].Dispatch[[System.__Canon, mscorlib],[System.__Canon, mscorlib]](System.__Canon, System.Action2, System.__Canon, System.Action3, System.Action3)+62|
|System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(System.Data.Common.DbConnection, System.Data.Entity.Infrastructure.Interception.DbInterceptionContext)+1ee|
|System.Data.Entity.Core.EntityClient.EntityConnection.Open()+144|
|System.Data.Entity.Core.Objects.ObjectContext.EnsureConnection(Boolean)+a6|
|System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[System.__Canon, mscorlib]+3f|
|[[StubHelperFrame]]|
|System.Data.Entity.Core.Objects.ObjectQuery1+<>c__DisplayClass41_0[[System.__Canon, mscorlib]].b__0()+e3| |System.Data.Entity.Core.Objects.ObjectQuery1[[System.__Canon, mscorlib]].GetResults(System.Nullable1)+165| |System.Data.Entity.Core.Objects.ObjectQuery1[[System.__Canon, mscorlib]]..GetEnumerator>b__31_0()+1e|
|System.Data.Entity.Internal.LazyEnumerator1[[System.__Canon, mscorlib]].MoveNext()+27| |System.Linq.Enumerable.FirstOrDefault[[System.__Canon, mscorlib]](System.Collections.Generic.IEnumerable1)+f6|
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(3.2, 24%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESW%3C/text%3E%3C/svg%3E)
It is difficult to reproduce your problem based on your description, I suggest you open a case via: https://support.microsoft.com.
the culprit can only be determined when a very experienced professional takes a look at. So, like the another comment indicated, you might contact Microsoft support via a support case to get started.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(211.20000000000002, 61%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBS%3C/text%3E%3C/svg%3E)
your windows 2022 server is running your 4.6 code (out of support) with the 4.8 runtime. to get Microsoft support you will probably need to upgrade your code to .net 4.8 first, which may fix your issue. also check you have the lastest nuget package versions.
The end-of-life policy only applies to the runtime, so 4.x bits running on .NET Framework 4.0-4.6.1 are no longer supported.
As long as the bits are running on Windows Server 2022 which ships a supported .NET Framework release (4.7 and above), that's fully supported.
Besides, crashes related to unhandled exceptions (ObjectDisposedException) are commonly caused by bad code, not the runtime itself.
The post appears to imply it was running fine on an older runtime, but server 2022 runs the lastest runtime. Upgrading the nuget packages may help especially as it appears to be related to the MySQL driver.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(262.40000000000003, 46%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAK%3C/text%3E%3C/svg%3E)
If I were to guess, it looks like some issue with the MySQL library being used. I would perhaps double check the MySQL provider being used and installed on that server - check the older server, and see what version of the MySQL provider you are running.