Failing test Microsoft.Extensions.Caching.Memory.CapacityTests.AddingReplacementWhenTotalSizeExceedsCapacityDoesNotUpdateRemovesOldEntryAndTriggersCompaction

[radical]

Hit with Libraries Test Run release coreclr windows x86 Release on #72892 .
build, and log:

  Starting:    Microsoft.Extensions.Caching.Memory.Tests (parallel test collections = on, max threads = 2)
    Microsoft.Extensions.Caching.Memory.CapacityTests.AddingReplacementWhenTotalSizeExceedsCapacityDoesNotUpdateRemovesOldEntryAndTriggersCompaction [FAIL]
      Assert.True() Failure
      Expected: True
      Actual:   False
      Stack Trace:
        /_/src/libraries/Microsoft.Extensions.Caching.Memory/tests/CapacityTests.cs(264,0): at Microsoft.Extensions.Caching.Memory.CapacityTests.AddingReplacementWhenTotalSizeExceedsCapacityDoesNotUpdateRemovesOldEntryAndTriggersCompaction()
        --- End of stack trace from previous location ---
  Finished:    Microsoft.Extensions.Caching.Memory.Tests

[ghost]

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Issue Details

---

Hit with Libraries Test Run release coreclr windows x86 Release on #72892 .
build, and log:

  Starting:    Microsoft.Extensions.Caching.Memory.Tests (parallel test collections = on, max threads = 2)
    Microsoft.Extensions.Caching.Memory.CapacityTests.AddingReplacementWhenTotalSizeExceedsCapacityDoesNotUpdateRemovesOldEntryAndTriggersCompaction [FAIL]
      Assert.True() Failure
      Expected: True
      Actual:   False
      Stack Trace:
        /_/src/libraries/Microsoft.Extensions.Caching.Memory/tests/CapacityTests.cs(264,0): at Microsoft.Extensions.Caching.Memory.CapacityTests.AddingReplacementWhenTotalSizeExceedsCapacityDoesNotUpdateRemovesOldEntryAndTriggersCompaction()
        --- End of stack trace from previous location ---
  Finished:    Microsoft.Extensions.Caching.Memory.Tests

Author:	radical
Assignees:	-
Labels:	blocking-clean-ci, area-Extensions-Caching, test-failure
Milestone:	-

[eerhardt]

cc @danmoseley

[danmoseley]

failing here

            // Wait for compaction to complete
            Assert.True(await sem.WaitAsync(TimeSpan.FromSeconds(10)));

I'll run locally and see how long it normally takes to get an idea of whether it's hung or just taking eg 11 seconds.

[danmoseley]

On my machine, the wait is < 1 millisecond so very likely increasing the wait won't help, and there is a bug eg EvictionCallback isn't getting called for some reason.

I'll disable the tests that wait for compaction.