az pipelines runs artifact download failed with error code -4 on Mac(apple M4 pro)

[vnemanja995]

Describe the bug

When trying to run command az pipelines runs artifact download --debug --run-id 1234 --artifact-name artifact --path /project/downloads/artifactName inside podman container with Ubuntu 24.04 as a base image, the command fails with error code -4.

Related command

az pipelines runs artifact download

Errors

INFO: cli.azext_devops.dev.common.artifacttool: Downloaded 0.0 MB out of 986.3 MB (0%).
DEBUG: cli.azext_devops.dev.common.exception_handler: handling generic error
DEBUG: cli.azure.cli.core.azclierror: Traceback (most recent call last):
File "/opt/az/lib/python3.11/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.11/site-packages/azure/cli/core/commands/init.py", line 664, in execute
raise ex
File "/opt/az/lib/python3.11/site-packages/azure/cli/core/commands/init.py", line 731, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.11/site-packages/azure/cli/core/commands/init.py", line 723, in _run_job
return cmd_copy.exception_handler(ex)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.azure/cliextensions/azure-devops/azext_devops/dev/common/exception_handler.py", line 31, in azure_devops_exception_handler
reraise(*sys.exc_info())
File "/opt/az/lib/python3.11/site-packages/six.py", line 719, in reraise
raise value
File "/opt/az/lib/python3.11/site-packages/azure/cli/core/commands/init.py", line 701, in _run_job
result = cmd_copy(params)
^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.11/site-packages/azure/cli/core/commands/init.py", line 334, in call
return self.handler(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.11/site-packages/azure/cli/core/commands/command_operation.py", line 121, in handler
return op(**command_args)
^^^^^^^^^^^^^^^^^^
File "/home/user/.azure/cliextensions/azure-devops/azext_devops/dev/pipelines/runs_artifacts.py", line 27, in run_artifact_download
return artifact_tool.download_pipeline_artifact(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.azure/cliextensions/azure-devops/azext_devops/dev/common/artifacttool.py", line 25, in download_pipeline_artifact
return self.run_artifacttool(organization, args, "Downloading")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.azure/cliextensions/azure-devops/azext_devops/dev/common/artifacttool.py", line 67, in run_artifacttool
proc = self._tool_invoker.run(command_args, new_env, initial_progress_message, _process_stderr)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.azure/cliextensions/azure-devops/azext_devops/dev/common/external_tool.py", line 79, in run
return self.wait()
^^^^^^^^^^^
File "/home/user/.azure/cliextensions/azure-devops/azext_devops/dev/common/external_tool.py", line 51, in wait

Issue script & Debug output

above error

Expected behavior

az pipelines runs artifact download succeeds and pipeline artifact is downloaded

Environment Summary

azure-cli 2.87.0

core 2.87.0
telemetry 1.1.0

Extensions:
azure-devops 1.0.1

Dependencies:
msal 1.36.0
azure-mgmt-resource 24.0.0

Python location '/opt/az/bin/python3'
Config directory '/home/user/.azure'
Extensions directory '/home/user/.azure/cliextensions'

Python (Linux) 3.13.13 (main, May 26 2026, 06:39:46) [GCC 13.3.0]

Additional context

After inspecting debug logs we noticed that azure cli is downloading the following version of artifacttool - ArtifactTool_linux-arm64_0.2.550,
so we tried to use the artifacttool directly like this:

~/.azure/azuredevops/cli/tools/artifacttool/ArtifactTool_linux-arm64_0.2.550/artifacttool   pipelineartifact download   --service https://dev.azure.com/orgName --patvar AZURE_DEVOPS_EXT_ARTIFACTTOOL_PATVAR   --project project-uuid   --pipeline-id 1234   --artifact-name package   --path /tmp/package

Output:

{"@t":"2026-06-09T08:33:12.3198805Z","@m":"Getting artifact 'package' from pipeline '1234' from project 'project-uuid' in organization 'https://dev.azure.com/...'} {"@t":"2026-06-09T08:33:13.5206499Z","@m":"The manifest ID for artifact 'package' is 'xyz'.","@i":"xxx","SourceContext":"ArtifactTool.Commands.PipelineArtifactDownloadCommand","UtcTimestamp":"2026-06-09 08:33:13.520Z"} {"@t":"2026-06-09T08:33:17.0355325Z","@m":"ApplicationInsightsTelemetrySender will correlate events with X-TFS-Session session-id","@i":"abc","SourceContext":"ArtifactTool.Commands.PipelineArtifactDownloadCommand","UtcTimestamp":"2026-06-09 08:33:17.035Z"} {"@t":"2026-06-09T08:33:17.0357646Z","@m":"Downloading artifact 'package' with manifest ID 'xyz' to path '/tmp/package'.","@i":"xyz","SourceContext":"ArtifactTool.Commands.PipelineArtifactDownloadCommand","UtcTimestamp":"2026-06-09 08:33:17.035Z"} {"@t":"2026-06-09T08:33:17.0369744Z","@m":"DedupManifestArtifactClient will correlate http requests with X-TFS-Session session-id","@i":"123","SourceContext":"ArtifactTool.Commands.PipelineArtifactDownloadCommand","UtcTimestamp":"2026-06-09 08:33:17.036Z"} {"@t":"2026-06-09T08:33:17.3292673Z","@m":"Downloaded 0.0 MB out of 986.3 MB (0%).","@i":"123a","SourceContext":"ArtifactTool.Commands.PipelineArtifactDownloadCommand","UtcTimestamp":"2026-06-09 08:33:17.329Z"} {"@t":"2026-06-09T08:33:22.3325414Z","@m":"Downloaded 0.0 MB out of 986.3 MB (0%).","@i":"123a","SourceContext":"ArtifactTool.Commands.PipelineArtifactDownloadCommand","UtcTimestamp":"2026-06-09 08:33:22.332Z"} {"@t":"2026-06-09T08:33:27.3347752Z","@m":"Downloaded 0.0 MB out of 986.3 MB (0%).","@i":"123a","SourceContext":"ArtifactTool.Commands.PipelineArtifactDownloadCommand","UtcTimestamp":"2026-06-09 08:33:27.334Z"} Illegal instruction (core dumped)

[yonzhan]

Thank you for opening this issue, we will look into it.

[azclibot]

Thanks for the detailed report! Here's the context for investigation:

Issue: az pipelines runs artifact download fails with error code -4.

Root cause hint: The CLI downloaded ArtifactTool_linux-arm64_0.2.550 which crashes with Illegal instruction (core dumped) when run inside a podman container (Ubuntu 24.04). This suggests the ARM64 binary is being selected but either the container or host CPU doesn't support the required instruction set extensions used by that version of the artifacttool.

Failing command:

az pipelines runs artifact download --debug --run-id <run-id> --artifact-name <artifact> --path <path>

Key details:

• Extension: azure-devops 1.0.1
• Environment: Python 3.13.13, azure-cli 2.87.0, Linux (ARM64 container via podman on Mac M4 Pro)
• The downloaded ArtifactTool_linux-arm64_0.2.550 crashes with Illegal instruction (core dumped) when invoked directly
• The error propagates as exit code -4 back through the CLI

Scope: The fix likely lives in the azure-devops extension's artifacttool.py / external_tool.py — specifically in how the tool binary is selected or how errors from the subprocess are surfaced. The relevant code is at azext_devops/dev/common/artifacttool.py and azext_devops/dev/common/external_tool.py.

Please investigate why the ARM64 binary crashes (possibly a CPU feature mismatch in the container) and improve error reporting so the actual process exit code and stderr are surfaced rather than a generic -4.

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Posted by agent-assist (autonomous bug-fix pipeline).