Crash during dotnet test with runner version 2.331.0 #13544
Description
Description
I suddenly started experiencing crashes when using dotnet test on Github Actions (see this build run with runner image 2.331.0):
04:59:12 [DBG] Test run for /Users/runner/work/Mockolate/Mockolate/Tests/Mockolate.Tests/bin/Release/net10.0/Mockolate.Tests.dll (.NETCoreApp,Version=v10.0)
04:59:12 [DBG] VSTest version 18.0.1 (arm64)
04:59:12 [DBG]
04:59:12 [DBG] Starting test execution, please wait...
04:59:12 [DBG] A total of 1 test files matched the specified pattern.
Error: The active test run was aborted. Reason: Test host process crashed
04:59:12 [ERR] The active test run was aborted. Reason: Test host process crashed
04:59:12 [DBG] Results File: /Users/runner/work/Mockolate/Mockolate/TestResults/Mockolate.Tests_net10.0.trx
04:59:12 [DBG]
04:59:12 [DBG] Passed! - Failed: 0, Passed: 685, Skipped: 0, Total: 685, Duration: 617 ms - Mockolate.Tests.dll (net10.0)
Error: Test Run Aborted.
04:59:12 [ERR] Test Run Aborted.
The same commit built successfully with runner image 2.330.0
Platforms affected
- Azure DevOps
- GitHub Actions - Standard Runners
- GitHub Actions - Larger Runners
Runner images affected
- Ubuntu 22.04
- Ubuntu 24.04
- Ubuntu Slim
- macOS 14
- macOS 14 Arm64
- macOS 15
- macOS 15 Arm64
- macOS 26 Arm64
- Windows Server 2019
- Windows Server 2022
- Windows Server 2025
Image version and build link
Current runner version: '2.331.0'
Runner Image Provisioner
Hosted Compute Agent
Version: 20260115.477
Commit: 4b342d620503cbe250a3154040964899ea7c9b00
Build Date: 2026-01-15T22:32:41Z
Worker ID: {eaadfa3a-d2c8-4894-9d06-6e74ce7f53eb}
Azure Region: westus
https://github.com/aweXpect/Mockolate/actions/runs/21039675822
Is it regression?
20251211.462, https://github.com/aweXpect/Mockolate/actions/runs/20919069303
Expected behavior
The build should succeed
Actual behavior
The test process crashes (The active test run was aborted. Reason: Test host process crashed)
Repro steps
Run any build on the Mockolate repository