Steve Harter

Closing; the 7-day hit count had one [hit](https://dev.azure.com/dnceng/internal/_build/results?buildId=2529303), but appears unrelated: ``` 2024-09-02T11:45:39.4477530Z Restored /Users/runner/work/1/s/src/libraries/Microsoft.Extensions.Caching.Memory/src/Microsoft.Extensions.Caching.Memory.csproj (in 255 ms). 2024-09-02T11:45:39.4763880Z Restored /Users/runner/work/1/s/src/libraries/Microsoft.Bcl.TimeProvider/src/Microsoft.Bcl.TimeProvider.csproj (in 272 ms). 2024-09-02T11:45:39.4951230Z Restored /Users/runner/work/1/s/src/libraries/Microsoft.Extensions.Caching.Abstractions/src/Microsoft.Extensions.Caching.Abstractions.csproj (in 301 ms)....

Created this issue to track the above NuGet issue for `OptimisticallyNonAllocatingEnumerable.Enumerator..ctor` : https://github.com/dotnet/runtime/issues/107361

Although this issue should now be fixed, re-opening this for a week or so to ensure there are no additional test hits.

This will be backported to v6 and v8 once we verify the fix for v9 (v7 is out of service).

Closing; no new 9.0 hits in last few days.

@akoeplinger did you investigate a potential JIT issue around NuGet restore?

Test code hasn't changed since it was added 6 years ago: https://github.com/dotnet/runtime/blame/9e28706dbc252e27174dce1a3b8f69c8ecc912b7/src/libraries/Microsoft.Extensions.Hosting/tests/UnitTests/Internal/HostTests.cs#L488 It is waiting for 5 seconds until `lifetimeStart` is signaled. ``` Assert.True(lifetimeStart.WaitOne(TimeSpan.FromSeconds(5))); ``` However that is done on...

Should this be closed?

Sample log: ``` Console log: 'System.Composition.Tests' from job 32757c85-c398-45a6-9f4b-356b5f0b3229 workitem 69dc8642-cfc4-4b8b-836c-aa84d2a9a897 (ubuntu.2204.amd64.open.rt) executed on machine a0059D1 running Linux-6.8.0-1021-azure-x86_64-with-glibc2.35 + export __TestArchitecture=x64 + ./RunTests.sh --runtime-path /datadisks/disk1/work/9F3D08C6/p ========================= Begin custom configuration settings...

The [test](https://github.com/dotnet/runtime/blob/e0f1b2188f0f33b0708eff9d32597c50fb2f06d1/src/libraries/System.Composition/tests/ConcurrencyTests.cs) has not been modified. The code in System.Composition has not changed except for https://github.com/dotnet/runtime/pull/113667 which "updates the target .NET Framework version from net48 to net481 in pipelines, tests,...