az acr task create failing in az cli 2.72.0

[adityag221]

Describe the bug

We have azure devops pipeline which create ACR tasks, and recently Azure CLI version got updated to 2.72.0 and things are breaking for us now, I checked on my local I was able to create ACR tasks with version 2.71.0 but it's failing with the upgraded version

Related command

az acr task create --name "$taskName"
--resource-group "$acrresourceGroup"
--registry "$acrregistry"
--image "$acrimage"
--platform Linux
--cmd "docker run $acrimage -config $configName -RUNID {{.Run.ID}}"
--assign-identity
--schedule "$schedule"
--context "/dev/null" || { echo "Failed to create ACR task: $taskName"; exit 1; }

Errors

ERROR: Object of type generator is not JSON serializable
Traceback (most recent call last):
File "/opt/az/lib/python3.12/site-packages/knack/cli.py", line 239, in invoke
self.output.out(cmd_result, formatter=formatter, out_file=out_file)
File "/opt/az/lib/python3.12/site-packages/knack/output.py", line 146, in out
output = formatter(obj)
^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/knack/output.py", line 37, in format_json
return json.dumps(input_dict, ensure_ascii=False, indent=2, sort_keys=True, cls=_ComplexEncoder,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/json/init.py", line 238, in dumps
**kw).encode(obj)
^^^^^^^^^^^
File "/opt/az/lib/python3.12/json/encoder.py", line 202, in encode
chunks = list(chunks)
^^^^^^^^^^^^
File "/opt/az/lib/python3.12/json/encoder.py", line 432, in _iterencode
yield from _iterencode_dict(o, _current_indent_level)
File "/opt/az/lib/python3.12/json/encoder.py", line 406, in _iterencode_dict
yield from chunks
File "/opt/az/lib/python3.12/json/encoder.py", line 439, in _iterencode
o = _default(o)
^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/knack/output.py", line 30, in default
return json.JSONEncoder.default(self, o)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/json/encoder.py", line 180, in default
raise TypeError(f'Object of type {o.class.name} '
TypeError: Object of type generator is not JSON serializable
To check existing issues, please visit: https://github.com/Azure/azure-cli/issues
Failed to create ACR task: taskid

Issue script & Debug output

DEBUG: urllib3.connectionpool: Starting new HTTPS connection (1): management.azure.com:443
DEBUG: urllib3.connectionpool: https://management.azure.com:443 "PUT /subscriptions//resourceGroups/rg/providers/Microsoft.ContainerRegistry/registries/acr/tasks/?api-version=2019-06-01-preview HTTP/1.1" 200 1611
DEBUG: cli.azure.cli.core.sdk.policies: Response status: 200
DEBUG: cli.azure.cli.core.sdk.policies: Response headers:
DEBUG: cli.azure.cli.core.sdk.policies: 'Cache-Control': 'no-cache'
DEBUG: cli.azure.cli.core.sdk.policies: 'Pragma': 'no-cache'
DEBUG: cli.azure.cli.core.sdk.policies: 'Content-Length': '1611'
DEBUG: cli.azure.cli.core.sdk.policies: 'Content-Type': 'application/json; charset=utf-8'
DEBUG: cli.azure.cli.core.sdk.policies: 'Expires': '-1'
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-operation-identifier': 'tenantId=tid,objectId=oid'
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-request-id': 'rid'
DEBUG: cli.azure.cli.core.sdk.policies: 'Strict-Transport-Security': 'max-age=31536000; includeSubDomains'
DEBUG: cli.azure.cli.core.sdk.policies: 'X-Content-Type-Options': 'nosniff'
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-ratelimit-remaining-subscription-writes': '799'
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-ratelimit-remaining-subscription-global-writes': '11999'
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-correlation-request-id': 'cid'
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-routing-request-id': 'WESTUS:***'
DEBUG: cli.azure.cli.core.sdk.policies: 'X-Cache': 'CONFIG_NOCACHE'
DEBUG: cli.azure.cli.core.sdk.policies: 'X-MSEdge-Ref': 'Ref A: ** Ref B: ** Ref C: 2025-05-09T06:23:42Z'
DEBUG: cli.azure.cli.core.sdk.policies: 'Date': 'Fri, 09 May 2025 06:23:42 GMT'
DEBUG: cli.azure.cli.core.sdk.policies: Response content:
DEBUG: cli.azure.cli.core.sdk.policies: Body is streamable
DEBUG: cli.knack.cli: Event: CommandInvoker.OnTransformResult [<function _resource_group_transform at 0x000001CE6A0ABA60>, <function x509_from_base64_to_hex_transform at 0x000001CE6A0ABB00>]
DEBUG: cli.knack.cli: Event: CommandInvoker.OnFilterResult []
DEBUG: cli.azure.cli.core.azclierror: Traceback (most recent call last):
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 239, in invoke
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 146, in out
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 37, in format_json
File "json_init.py", line 238, in dumps
File "json\encoder.py", line 202, in encode
File "json\encoder.py", line 432, in _iterencode
File "json\encoder.py", line 406, in _iterencode_dict
File "json\encoder.py", line 439, in _iterencode
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 30, in default
File "json\encoder.py", line 180, in default
TypeError: Object of type generator is not JSON serializable

ERROR: cli.azure.cli.core.azclierror: The command failed with an unexpected error. Here is the traceback:
ERROR: az_command_data_logger: The command failed with an unexpected error. Here is the traceback:
ERROR: cli.azure.cli.core.azclierror: Object of type generator is not JSON serializable
Traceback (most recent call last):
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 239, in invoke
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 146, in out
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 37, in format_json
File "json_init_.py", line 238, in dumps
File "json\encoder.py", line 202, in encode
File "json\encoder.py", line 432, in _iterencode
File "json\encoder.py", line 406, in _iterencode_dict
File "json\encoder.py", line 439, in iterencode
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 30, in default
File "json\encoder.py", line 180, in default
TypeError: Object of type generator is not JSON serializable
ERROR: az_command_data_logger: Object of type generator is not JSON serializable
Traceback (most recent call last):
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 239, in invoke
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 146, in out
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 37, in format_json
File "json_init.py", line 238, in dumps
File "json\encoder.py", line 202, in encode
File "json\encoder.py", line 432, in _iterencode
File "json\encoder.py", line 406, in _iterencode_dict
File "json\encoder.py", line 439, in _iterencode
File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/output.py", line 30, in default
File "json\encoder.py", line 180, in default
TypeError: Object of type generator is not JSON serializable
To check existing issues, please visit: https://github.com/Azure/azure-cli/issues

Expected behavior

ACR tasks created successfully

Environment Summary

azure-cli 2.72.0

core 2.72.0

telemetry 1.1.0

Extensions:

azure-devops 1.0.1

Dependencies:

msal 1.32.3

azure-mgmt-resource 23.1.1

Additional context

It seems while the request was successful with response of 200, yet the Azure CLI was unable to parse the response body.

[yonzhan]

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

[microsoft-github-policy-service]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @toddysm, @northtyphoon, @luisdlp, @terencet-dev, @shizhMSFT, @JXavierMSFT.

[shizhMSFT]

After a quick investigation, the body of returned response is streamable in 2.72.0 but is not in 2.71.0.

[lizMSFT]

Hi @adityag221 We've identified a regression in 2.72.0, and the issue is scheduled to be fixed in the upcoming CLI release, version 2.73.0. Thank you for your feedback!

[FeynmanZhou]

@adityag221 You can upgrade to Azure CLI 2.73.0 or latest version 2.75.0 to mitigate this issue. We will close it as completed. Let us know if it still blocks you. Thanks