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The nullability of HostEnvironmentInfo's Cpu property was mistakenly going unnoticed. This caused a null reference exception in the ZeroMeasurementAnalyser. I corrected this by making it nullable and checking for it in the analyser. Preventing it from breaking for all not-yet supported OS CpuDetectors

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BraedenLS commented May 27, 2025

@dotnet-policy-service agree company="Lake Shore Cryotronics"

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I believe the main issue is that HostEnvironmentInfo assigns null to the non-nullable Cpu. I would prefer to keep HostEnvironmentInfo.Cpu as Lazy<CpuInfo> (a non-nullable value) to avoid multiple null checks. CpuInfo is already designed to potentially miss any of its properties. A better solution would be to introduce CpuInfo.Unknown on the Perfolizer side and use it in HostEnvironmentInfo if all the CpuDetectors fail to detect the CPU. I will release a new version of Perfolizer and bump it in BenchmarkDotNet.

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CpuInfo.Unknown is available in the latest master. @BraedenLS, I suggest upgrading the HostEnvironmentInfo.Cpu lazy definition to use CpuInfo.Unknown if CpuDetector.CrossPlatform.Detect() returns null.

@BraedenLS BraedenLS force-pushed the bugfix/handle-null-cpu-info branch from b473dd0 to 01b34ba Compare May 27, 2025 20:53
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Rebased and implemented.

@BraedenLS BraedenLS changed the title Fix #2740: Add nullability to HostEnvironmentInfo's CpuInfo Fix #2740: Use CpuInfo.Unknown if CpuDetector.Detect() does not find supported OS May 27, 2025
@AndreyAkinshin AndreyAkinshin merged commit c0bcfb9 into dotnet:master May 27, 2025
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@AndreyAkinshin AndreyAkinshin added this to the v0.15.1 milestone May 27, 2025
This was referenced Sep 17, 2025
microsoft-github-policy-service bot pushed a commit to Azure/bicep that referenced this pull request Sep 21, 2025
Updated [BenchmarkDotNet](https://github.com/dotnet/BenchmarkDotNet)
from 0.14.0 to 0.15.3.

<details>
<summary>Release notes</summary>

_Sourced from [BenchmarkDotNet's
releases](https://github.com/dotnet/BenchmarkDotNet/releases)._

## 0.15.3

Full changelog: https://benchmarkdotnet.org/changelog/v0.15.3.html

## Highlights

Improvements:

- Naot instruction set support for .NET 10+, migrate to ISA groupings in
CPU summary
[#​2828](dotnet/BenchmarkDotNet#2828)
- Support benchmark filtering for TestAdapter
[#​2662](dotnet/BenchmarkDotNet#2662)
[#​2788](dotnet/BenchmarkDotNet#2788)
- Support non-primitive external types in `ArgumentsSource`
[#​2820](dotnet/BenchmarkDotNet#2820)
- Enable MSBuild parallel build via `--nodeReuse:false`
[#​2693](dotnet/BenchmarkDotNet#2693)
[#​2814](dotnet/BenchmarkDotNet#2814)
- Improve CPU detection
[#​2747](dotnet/BenchmarkDotNet#2747)
[#​2749](dotnet/BenchmarkDotNet#2749)
- Enable assembly signing for debug build
[#​2774](dotnet/BenchmarkDotNet#2774)

Deprecations:

- Deprecated `WithNuget`
[#​2812](dotnet/BenchmarkDotNet#2812)

Bug fixes:

- Fix `InvalidOperationException` in diagnosers
[#​2758](dotnet/BenchmarkDotNet#2758)
[#​2805](dotnet/BenchmarkDotNet#2805)
- Fix file detection in `NativeMemoryProfiler`
[#​2794](dotnet/BenchmarkDotNet#2794)
[#​2795](dotnet/BenchmarkDotNet#2795)
- Fix long file paths issue in `EtwProfiler`
[#​2807](dotnet/BenchmarkDotNet#2807)
[#​2808](dotnet/BenchmarkDotNet#2808)
- Fix log duplications in TestAdapter
[#​2790](dotnet/BenchmarkDotNet#2790)
- Fix x86 disassembler error for net462
[#​2792](dotnet/BenchmarkDotNet#2792)
- Fix `IsNetCore` and `IsNativeAOT` for single-file apps without AOT
[#​2799](dotnet/BenchmarkDotNet#2799)
- Fix density plot generation in `RPlotExporter` for latest version of R
[#​2809](dotnet/BenchmarkDotNet#2809)


## 0.15.2

Full changelog: https://benchmarkdotnet.org/changelog/v0.15.2.html

## Highlights

- The most significant update in this release is the enhanced accuracy
of the memory diagnoser
([#​2562](dotnet/BenchmarkDotNet#2562)). This
improvement resolves the issue of incorrectly reported memory
allocations
([#​1542](dotnet/BenchmarkDotNet#1542),
[#​2582](dotnet/BenchmarkDotNet#2582)).
- We have introduced a new feature that allows users to sort benchmark
jobs in numerical order
([#​2768](dotnet/BenchmarkDotNet#2768),
[#​2770](dotnet/BenchmarkDotNet#2770)).
- Benchmark validation has been improved
([#​2771](dotnet/BenchmarkDotNet#2771)).
- An issue with non-persistent auto-generated JobId has been fixed
([#​2777](dotnet/BenchmarkDotNet#2777)).


## 0.15.1

Full changelog: https://benchmarkdotnet.org/changelog/v0.15.1.html

## Highlights

- Added support for *.slnx
([#​2763](dotnet/BenchmarkDotNet#2763),
[#​2764](dotnet/BenchmarkDotNet#2764))
- Enabled ArgumentsSource to reference methods in other types
([#​2744](dotnet/BenchmarkDotNet#2744),
[#​2748](dotnet/BenchmarkDotNet#2748))
- Resolved fatal errors for ARM CPUs
([#​2745](dotnet/BenchmarkDotNet#2745),
[#​2756](dotnet/BenchmarkDotNet#2756))
- Fixed bugs related to support for Android, browser, iOS, and tvOS
([#​2739](dotnet/BenchmarkDotNet#2739),
[#​2741](dotnet/BenchmarkDotNet#2741),
[#​2740](dotnet/BenchmarkDotNet#2740),
[#​2742](dotnet/BenchmarkDotNet#2742))



## 0.15.0

Full changelog: https://benchmarkdotnet.org/changelog/v0.15.0.html



Commits viewable in [compare
view](dotnet/BenchmarkDotNet@v0.14.0...v0.15.3).
</details>

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</details>
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