Access to the path '/home/mnj/.local/share/containers/storage/overlay/.. is denied?

[marcinjahn]

I'm trying to run the bechmark from https://benchmarkdotnet.org/articles/guides/getting-started.html.
dotnet run -c Release has the following output:

// Validating benchmarks:
// ***** BenchmarkRunner: Start   *****
// ***** Found 2 benchmark(s) in total *****
// ***** Building 1 exe(s) in Parallel: Start   *****
// ***** Done, took 00:00:02 (2.39 sec)   *****
// Found 2 benchmarks:
//   Md5VsSha256.Sha256: DefaultJob
//   Md5VsSha256.Md5: DefaultJob

// Generate Exception: System.UnauthorizedAccessException: Access to the path '/home/mnj/.local/share/containers/storage/overlay/ff61288260d86af39b1c40c6329c73115ed9d82f3af26cf5102cd4ff6e915eea' is denied.
 ---> System.IO.IOException: Permission denied
   --- End of inner exception stack trace ---
   at System.IO.Enumeration.FileSystemEnumerator`1.MoveNext()
   at System.Linq.Enumerable.IEnumerableWhereIterator`1.ToArray()
   at BenchmarkDotNet.Toolchains.CsProj.CsProjGenerator.GetProjectFilePath(Type benchmarkTarget, ILogger logger)
   at BenchmarkDotNet.Toolchains.CsProj.CsProjGenerator.GenerateProject(BuildPartition buildPartition, ArtifactsPaths artifactsPaths, ILogger logger)
   at BenchmarkDotNet.Toolchains.GeneratorBase.GenerateProject(BuildPartition buildPartition, ILogger logger, String rootArtifactsFolderPath)

// BenchmarkDotNet has failed to build the auto-generated boilerplate code.
// It can be found in /home/mnj/tmp/string-concatenation-benchmark/StringConcatenationBenchmark/bin/Release/net9.0/StringConcatenationBenchmark-DefaultJob-1
// Please follow the troubleshooting guide: https://benchmarkdotnet.org/articles/guides/troubleshooting.html

// ** Remained 0 (0.0%) benchmark(s) to run. Estimated finish 2025-11-19 8:43 (0h 0m from now) **
// ***** BenchmarkRunner: Finish  *****

// * Export *
  BenchmarkDotNet.Artifacts/results/MyBenchmarks.Md5VsSha256-report.csv
  BenchmarkDotNet.Artifacts/results/MyBenchmarks.Md5VsSha256-report-github.md
  BenchmarkDotNet.Artifacts/results/MyBenchmarks.Md5VsSha256-report.html

// * Detailed results *
Md5VsSha256.Sha256: DefaultJob
Runtime = ; GC =
There are not any results runs

// * Summary *

BenchmarkDotNet v0.15.6, Linux Fedora Linux 42 (Workstation Edition)
AMD Ryzen 7 PRO 5850U with Radeon Graphics 1.11GHz, 1 CPU, 16 logical and 8 physical cores
.NET SDK 9.0.101
  [Host] : .NET 9.0.0 (9.0.0, 9.0.24.52809), X64 RyuJIT x86-64-v3


| Method | Mean | Error |
|------- |-----:|------:|
| Sha256 |   NA |    NA |

Benchmarks with issues:
  Md5VsSha256.Sha256: DefaultJob

// * Legends *
  Mean  : Arithmetic mean of all measurements
  Error : Half of 99.9% confidence interval
  1 ns  : 1 Nanosecond (0.000000001 sec)

// ***** BenchmarkRunner: End *****
Run time: 00:00:00 (0.01 sec), executed benchmarks: 0

Global total time: 00:00:02 (2.5 sec), executed benchmarks: 0
// * Artifacts cleanup *
Artifacts cleanup is finished

Here's my csproj:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="BenchmarkDotNet" Version="0.15.6" />
  </ItemGroup>

</Project>

What could be wrong? I'm running Fedora 42, .NET 9. I'm trying to run the benchmark directly on the host, not in any VM or container.

[adamsitnik]

Hi @marcinjahn !

BDN is trying to find the project file that defines the benchmarks. To do that, it tries to find the .sln file first:

BenchmarkDotNet/src/BenchmarkDotNet/Toolchains/CsProj/CsProjGenerator.cs

Lines 257 to 261 in d2be797

	var possibleNames = new HashSet<string> { $"{projectName}.csproj", $"{projectName}.fsproj", $"{projectName}.vbproj" };
	var projectFiles = rootDirectory
	.EnumerateFiles("*proj", SearchOption.AllDirectories)
	.Where(file => possibleNames.Contains(file.Name))
	.ToArray();

When it fails, it uses current directory to search for project file:

BenchmarkDotNet/src/BenchmarkDotNet/Toolchains/CsProj/CsProjGenerator.cs

Lines 247 to 251 in d2be797

	if (!GetSolutionRootDirectory(out var rootDirectory) && !GetProjectRootDirectory(out rootDirectory))
	{
	logger.WriteLineError(
	$"Unable to find .sln or .csproj file. Will use current directory {Directory.GetCurrentDirectory()} to search for project file. If you don't use .sln file on purpose it should not be a problem.");
	rootDirectory = new DirectoryInfo(Directory.GetCurrentDirectory());

Some possible solutions/workarounds:

• run the benchmarks from different working directory
• add .sln file