Caching.Memory tests are impacting CI reliability

[jaredpar]

Several tests in this group are failing. Looks like some inherent flakiness here that needs to be addressed:

• Microsoft.Extensions.Caching.Memory.MemoryCacheSetAndRemoveTests.GetAndSet_AreThreadSafe_AndUpdatesNeverLeavesNullValues
• Microsoft.Extensions.Caching.Memory.MemoryCacheSetAndRemoveTests.GetAndSet_AreThreadSafe_AndUpdatesNeverLeavesNullValues
• Microsoft.Extensions.Caching.Memory.CapacityTests.ExpiringEntryDecreasesCacheSize

Console Log Summary

Assert.False() Failure\nExpected: False\nActual: True

Stack trace
   at Microsoft.Extensions.Caching.Memory.MemoryCacheSetAndRemoveTests.GetAndSet_AreThreadSafe_AndUpdatesNeverLeavesNullValues() in /_/src/libraries/Microsoft.Extensions.Caching.Memory/tests/MemoryCacheSetAndRemoveTests.cs:line 489

Builds

Build	Pull Request	Test Failure Count
#573475	#33984	1
#574007	#34107	1
#574039	Rolling	1
#574145	#34113	1
#574187	Rolling	2
#574195	#32592	3
#574272	#32107	1
#574310	Rolling	3
#574321	#32592	1
#574382	#34061	1

Configurations

• netcoreapp5.0-Linux-Debug-x64-CoreCLR_release-Debian.9.Amd64.Open
• netcoreapp5.0-Linux-Debug-x64-Mono_release-SLES.15.Amd64.Open
• netcoreapp5.0-Linux-Release-arm64-CoreCLR_release-(Alpine.38.Arm64.Open)Ubuntu.1804.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.8-helix-arm64v8-a45aeeb-20190620184035
• netcoreapp5.0-Linux-Release-arm64-CoreCLR_release-(Ubuntu.1804.ArmArch.Open)Ubuntu.1804.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-helix-arm64v8-bfcd90a-20200127194925
• netcoreapp5.0-Linux-Release-x64-CoreCLR_release-Debian.9.Amd64.Open
• netcoreapp5.0-Windows_NT-Debug-x64-Mono_release-(Windows.Nano.1809.Amd64.Open)windows.10.amd64.serverrs5.open@mcr.microsoft.com/dotnet-buildtools/prereqs:nanoserver-1809-helix-amd64-08e8e40-20200107182504
• netcoreapp5.0-Windows_NT-Debug-x86-CoreCLR_release-Windows.10.Amd64.Server19H1.Open
• netcoreapp5.0-Windows_NT-Release-x86-CoreCLR_checked-Windows.10.Amd64.Open
• netcoreapp5.0-Windows_NT-Release-x86-CoreCLR_release-Windows.10.Amd64.Server19H1.Open
• netcoreapp5.0-Windows_NT-Release-x86-CoreCLR_release-Windows.10.Amd64.ServerRS5.Open

Helix Logs

Build	Pull Request	Console	Core	Test Results
#573475	#33984	console.d2783e41.log		testResults.xml
#574007	#34107	console.dfed949a.log
#574039	Rolling	console.5888d78a.log
#574145	#34113	console.ed98370f.log		testResults.xml
#574187	Rolling	console.18e09cc6.log		testResults.xml
#574187	Rolling	console.c15c1d96.log		testResults.xml
#574195	#32592	console.8de44599.log		testResults.xml
#574195	#32592	console.6bef8943.log		testResults.xml
#574195	#32592	console.b749e716.log
#574272	#32107	console.ad9f0b28.log		testResults.xml
#574310	Rolling	console.d7ef0d51.log
#574310	Rolling	console.b7698877.log		testResults.xml
#574310	Rolling	console.685207a6.log
#574321	#32592	console.1b681dda.log
#574382	#34061	console.a5a81439.log

[ericstj]

@maryamariyan can we disable these tests and file an issue? (or fix the tests or product if the bug is straightforward)

[maryamariyan]

I spotted one of them yesterday on the CI PR that were failing on Mono so I created this issue for it:
#33993.

Thanks seems like it is not necessarily a Mono flakiness. I'll update that issue and push a PR

[ericstj]

Dup of #33993