Azure DevOps Ubuntu 24.04 DB Creation for C#

[Tingle01]

Using an Azure DevOps Ubuntu 24.04 image as ubuntu-latest

Downloaded CodeQL command-line toolchain release 2.25.0.

Creating CodeQL DB for 'csharp' in '/home/vsts/work/1/a/codeqldb/csharp' with args: --build-mode none

Receiving the following error message in the pipeline:

========================== Starting Command Output ===========================
/usr/bin/bash --noprofile --norc /home/vsts/work/_temp/c3d589b8-77a0-43fe-b1a2-aefbb9428de0.sh
→ Creating CodeQL DB for 'csharp' in '/home/vsts/work/1/a/codeqldb/csharp' with args: --build-mode none
Initializing database at /home/vsts/work/1/a/codeqldb/csharp.
Running build command: []
Running command in /home/vsts/work/1/s/network: [/home/vsts/work/1/s/codeql/csharp/tools/autobuild.sh]
[2026-03-23 09:09:16] [build-stdout] CodeQL C# autobuilder
[2026-03-23 09:09:16] [build-stdout] Working directory: /home/vsts/work/1/s/network
[2026-03-23 09:09:16] [build-stdout] [001] Extracting C# with build-mode set to 'none'
[2026-03-23 09:09:16] [build-stdout] [001] Finding files in /home/vsts/work/1/s/network...
[2026-03-23 09:09:16] [build-stdout] [001] Found 766 files in /home/vsts/work/1/s/network
[2026-03-23 09:09:16] [build-stdout] [001] Found 766 small non-binary files in /home/vsts/work/1/s/network.
[2026-03-23 09:09:16] [build-stdout] [001] Found 426 source files in /home/vsts/work/1/s/network.
[2026-03-23 09:09:16] [build-stdout] [001] Found 0 global.json files in /home/vsts/work/1/s/network.
[2026-03-23 09:09:16] [build-stdout] [001] No Dependabot proxy credentials are configured.
[2026-03-23 09:09:16] [build-stdout] [001] Using .NET CLI executable: 'dotnet'
[2026-03-23 09:09:16] [build-stdout] [001] Running 'dotnet --info'
[2026-03-23 09:09:19] [build-stderr] [001] Error: Missing dotnet CLI
[2026-03-23 09:09:19] [build-stderr] Unhandled exception. System.Exception: dotnet --info failed with exit code 139.
[2026-03-23 09:09:19] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DotNet.Info()
[2026-03-23 09:09:19] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DotNet..ctor(IDotNetCliInvoker dotnetCliInvoker, ILogger logger, Boolean runDotnetInfo, TemporaryDirectory tempWorkingDirectory)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DotNet..ctor(ILogger logger, String dotNetPath, TemporaryDirectory tempWorkingDirectory, DependabotProxy dependabotProxy)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DotNet.Make(ILogger logger, String dotNetPath, TemporaryDirectory tempWorkingDirectory, DependabotProxy dependabotProxy)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DependencyManager..ctor(String srcDir, ILogger logger)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Extraction.CSharp.Standalone.Extractor.Run(Options options)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Extraction.CSharp.Standalone.Program.Main(String[] args)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Autobuild.CSharp.StandaloneBuildRule.<>c.b__0_1(IBuildActions _)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Util.BuildScript.ReturnBuildCommand.Run(IBuildActions actions, Action2 startCallback, Action3 exitCallBack, BuildOutputHandler onOutput, BuildOutputHandler onError)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Util.BuildScript.BindBuildScript.Run(IBuildActions actions, Action2 startCallback, Action3 exitCallBack, BuildOutputHandler onOutput, BuildOutputHandler onError)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Util.BuildScript.BindBuildScript.Run(IBuildActions actions, Action2 startCallback, Action3 exitCallBack, BuildOutputHandler onOutput, BuildOutputHandler onError)
[2026-03-23 09:09:19] [build-stderr] at Semmle.Autobuild.Shared.Autobuilder`1.AttemptBuild()
[2026-03-23 09:09:19] [build-stderr] at Semmle.Autobuild.CSharp.Program.Main()
[2026-03-23 09:09:21] [build-stderr] Aborted (core dumped)
[2026-03-23 09:09:21] [ERROR] Spawned process exited abnormally (code 134; tried to run: [/home/vsts/work/1/s/codeql/csharp/tools/autobuild.sh])
A fatal error occurred: Exit status 134 from command: [/home/vsts/work/1/s/codeql/csharp/tools/autobuild.sh]

##[error]Bash exited with code '2'.
Finishing: codeql: database-build-csharp

We have already installed dotnet on the image, I can't work out why our pipelines are failing?

[redsun82]

👋 @Tingle01

The error message might be misleading there, dotnet was found, but it segfaulted leading to it causing error 139. I'm not sure what might be causing this.

Is this error happening every time, or only sporadically? Could you try setting DOTNET_CLI_TELEMETRY_OPTOUT=1 in the environment? If that solves it, we might want to set it in our autobuild.

[Tingle01]

It looks like it's happening all the time on Ubuntu-24.04 Azure DevOps agents when we are scanning dotnet solutions. I've tried setting the DOTNET_CLI_TELEMETRY_OPTOUT=1 as an environment variable on the script, but still get the same error.

Here's the latest logs with debug enabled:

Running command in /home/vsts/work/1/s/network: [/home/vsts/work/1/s/codeql/csharp/tools/autobuild.sh]
[2026-03-24 13:10:40] [build-stdout] CodeQL C# autobuilder
[2026-03-24 13:10:40] [build-stdout] Working directory: /home/vsts/work/1/s/network
[2026-03-24 13:10:40] [build-stdout] [001] Extracting C# with build-mode set to 'none'
[2026-03-24 13:10:40] [build-stdout] [001] Finding files in /home/vsts/work/1/s/network...
[2026-03-24 13:10:40] [build-stdout] [001] Found 766 files in /home/vsts/work/1/s/network.
[2026-03-24 13:10:40] [build-stdout] [001] Found 766 small non-binary files in /home/vsts/work/1/s/network.
[2026-03-24 13:10:40] [build-stdout] [001] Found 426 source files in /home/vsts/work/1/s/network.
[2026-03-24 13:10:40] [build-stdout] [001] Found 0 global.json files in /home/vsts/work/1/s/network.
[2026-03-24 13:10:40] [build-stdout] [001] No Dependabot proxy credentials are configured.
[2026-03-24 13:10:40] [build-stdout] [001] Using .NET CLI executable: 'dotnet'
[2026-03-24 13:10:40] [build-stdout] [001] Running 'dotnet --info'
##[debug]Agent environment resources - Disk: / Available 13881.88 MB out of 73325.30 MB, Memory: Used 1191.00 MB out of 7939.00 MB, CPU: Usage 76.31%
[2026-03-24 13:10:44] [build-stderr] [001] Error: Missing dotnet CLI
[2026-03-24 13:10:44] [build-stderr] Unhandled exception. System.Exception: dotnet --info failed with exit code 139.
[2026-03-24 13:10:44] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DotNet.Info()
[2026-03-24 13:10:44] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DotNet..ctor(IDotNetCliInvoker dotnetCliInvoker, ILogger logger, Boolean runDotnetInfo, TemporaryDirectory tempWorkingDirectory)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DotNet..ctor(ILogger logger, String dotNetPath, TemporaryDirectory tempWorkingDirectory, DependabotProxy dependabotProxy)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DotNet.Make(ILogger logger, String dotNetPath, TemporaryDirectory tempWorkingDirectory, DependabotProxy dependabotProxy)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Extraction.CSharp.DependencyFetching.DependencyManager..ctor(String srcDir, ILogger logger)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Extraction.CSharp.Standalone.Extractor.Run(Options options)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Extraction.CSharp.Standalone.Program.Main(String[] args)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Autobuild.CSharp.StandaloneBuildRule.<>c.b__0_1(IBuildActions _)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Util.BuildScript.ReturnBuildCommand.Run(IBuildActions actions, Action2 startCallback, Action3 exitCallBack, BuildOutputHandler onOutput, BuildOutputHandler onError)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Util.BuildScript.BindBuildScript.Run(IBuildActions actions, Action2 startCallback, Action3 exitCallBack, BuildOutputHandler onOutput, BuildOutputHandler onError)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Util.BuildScript.BindBuildScript.Run(IBuildActions actions, Action2 startCallback, Action3 exitCallBack, BuildOutputHandler onOutput, BuildOutputHandler onError)
[2026-03-24 13:10:44] [build-stderr] at Semmle.Autobuild.Shared.Autobuilder`1.AttemptBuild()
[2026-03-24 13:10:44] [build-stderr] at Semmle.Autobuild.CSharp.Program.Main()
[2026-03-24 13:10:46] [build-stderr] Aborted (core dumped)
[2026-03-24 13:10:46] [ERROR] Spawned process exited abnormally (code 134; tried to run: [/home/vsts/work/1/s/codeql/csharp/tools/autobuild.sh])
A fatal error occurred: Exit status 134 from command: [/home/vsts/work/1/s/codeql/csharp/tools/autobuild.sh]

##[debug]Process exited with code 2 and signal null for tool '/usr/bin/bash'
##[debug]STDIO streams have closed and received exit code 2 and signal null for tool '/usr/bin/bash'
##[error]Bash exited with code '2'.
##[debug]Processed: ##vso[task.issue type=error;source=TaskInternal;correlationId=4de8bbfb-30a5-401c-9b1a-3217d1e114df;]Bash exited with code '2'.
##[debug]task result: Failed
##[debug]Processed: ##vso[task.complete result=Failed;done=true;]
Finishing: codeql: database-build-csharp