IIS pool crash with .NET 10 runtime installation

[AlexisLabRQ]

Description

Hi,

Since we installed .NET 10 (10.0.1) hosting bundle side-by-side with .NET 6 and .NET 8 (8.0.22) on our dev servers, we encountered frequent pool crashes with our .NET 8 applications. Recycle the pools fix the problems for some time but the problem reappear some time thereafter. Also, they are out-of-process application. We uninstalled .NET 10 but the AspNetCoreModuleV2 stayed in version 10.0.1 and we still had the problem. We then uninstalled all versions and reinstalled only .NET 6 and .NET 8 to last version and everything is working again. There seems to be no event logs but we have this trace in failed request:

NOTIFY_MODULE_START RequestNotifications EXECUTE_REQUEST_HANDLER {002E91E3-E7AE-44AB-8E07-99230FFA6ADE} 0 1 3 14 0x10000 SFU*** {40000483-0806-1900-B63F-84710C7967BB} D:\a\_work\1\s\src\aspnetcore\src\Servers\IIS\AspNetCoreModuleV2\AspNetCore\proxymodule.cpp 97 2147943655 ANCM_HRESULT_FAILED ANCM {82ADEAD7-12B2-4781-BDCA-5A4B6C757191} 0 1 3 14 0x10000 SFU**** {40000483-0806-1900-B63F-84710C7967BB} D:\a\_work\1\s\src\aspnetcore\src\Servers\IIS\AspNetCoreModuleV2\AspNetCore\proxymodule.cpp 121 2147943655 ANCM_HRESULT_FAILED ANCM {82ADEAD7-12B2-4781-BDCA-5A4B6C757191} 0 1 3 16 0x100 SFU*** {40000483-0806-1900-B63F-84710C7967BB} AspNetCoreModuleV2 128 503 Service Unavailable 0 2147943655 MODULE_SET_RESPONSE_ERROR_STATUS RequestNotifications EXECUTE_REQUEST_HANDLER Le serveur est en cours d’arrêt. (0x800704e7) {002E91E3-E7AE-44AB-8E07-99230FFA6ADE} 0 1 5 2 0x100 SFU**** {40000483-0806-1900-B63F-84710C7967BB} AspNetCoreModuleV2 128 false 2 NOTIFY_MODULE_END RequestNotifications EXECUTE_REQUEST_HANDLER NOTIFICATION_FINISH_REQUEST {002E91E3-E7AE-44AB-8E07-99230FFA6ADE}

Reproduction Steps

.NET 8 app running with .NET 10 runtime installed

Expected behavior

IIS pool is not stopping

Actual behavior

Pool is crashing with .NET 8 app cohabiting with .NET 10 in IIS

Regression?

No response

Known Workarounds

Uninstall all .NET version and reinstall only .NET 6 and .NET 8 fixes the problem.

Configuration

App is running on .NET 8 (8.0.22)
IIS on Windows Server 2022 21H2 (20348.4529)
Architecture on x64

Other information

Might be in the AspNetCoreModuleV2

[BrennanConroy]

What makes you say the pool crashed? The log you shared occurs when the server is shutting down and rejecting incoming requests due to it no longer being able to process them.

There are also almost zero changes between 8.0 and 10.0 for this area so it'd be very surprising that 10.0 causes issues.

What version of the hosting bundle did you install for 8.0?
e.g. for 10.0:

You can also try setting shutdownDelay to 0 to revert the biggest recent IIS change https://learn.microsoft.com/aspnet/core/host-and-deploy/iis/advanced?view=aspnetcore-10.0#reduce-503-likelihood-during-app-recycle

[AlexisLabRQ]

That's the problem we don't have any traces except the failed req...and it returns 503. And we have the same behavior on all our 15 dev servers. The version of the hosting bundle with .NET 8 is this one

Will try your suggestion with the shutdownDelay may be the problem.