[BUG] Lambda runtime error "Failed to load context: contextvars_context"

[ari-luokkala]

Checks

• I have updated to the lastest minor and patch version of Strands
• I have checked the documentation and this is not expected behavior
• I have searched ./issues and there are no duplicates of my issue

Strands Version

v1.13.0

Python Version

3.12.v89

Operating System

Linux (AWS Lambda)

Installation Method

pip

Steps to Reproduce

1. Create a simple strands agent that runs on AWS Lambda
2. Invoke lambda

Expected Behavior

Lambda invoke should succeed.

Actual Behavior

Lambda invoke fails.

[ari-luokkala]

Problem is present with both lambda architectures: "x86_64" and "arm64".

Error logs:

[ERROR] Failed to load context: contextvars_context, fallback to contextvars_context Traceback (most recent call last): File "/opt/python/opentelemetry/context/__init__.py", line 46, in _load_runtime_context return next( # type: ignore ^^^^^^^^^^^^^^^^^^^^^ StopIteration

LAMBDA_WARNING: Unhandled exception. The most likely cause is an issue in the function code. However, in rare cases, a Lambda runtime update can cause unexpected function behavior. For functions using managed runtimes, runtime updates can be triggered by a function change, or can be applied automatically. To determine if the runtime has been updated, check the runtime version in the INIT_START log entry. If this error correlates with a change in the runtime version, you may be able to mitigate this error by temporarily rolling back to the previous runtime version. For more information, see https://docs.aws.amazon.com/lambda/latest/dg/runtimes-update.html

[ERROR] StopIteration Traceback (most recent call last): File "/var/lang/lib/python3.12/importlib/__init__.py", line 90, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1387, in _gcd_import File "<frozen importlib._bootstrap>", line 1360, in _find_and_load File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 935, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 999, in exec_module File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed File "/var/task/lambda.py", line 8, in <module> from strands import Agent File "/opt/python/strands/__init__.py", line 3, in <module> from . import agent, models, telemetry, types File "/opt/python/strands/agent/__init__.py", line 9, in <module> from .agent import Agent File "/opt/python/strands/agent/agent.py", line 31, in <module> from opentelemetry import trace as trace_api File "/opt/python/opentelemetry/trace/__init__.py", line 85, in <module> from opentelemetry import context as context_api File "/opt/python/opentelemetry/context/__init__.py", line 70, in <module> _RUNTIME_CONTEXT = _load_runtime_context() File "/opt/python/opentelemetry/context/__init__.py", line 60, in _load_runtime_context return next( # type: ignore

INIT_REPORT Init Duration: 286.39 ms Phase: init Status: error Error Type: Runtime.Unknown

[poshinchen]

Hi,

I tried with the example in our documentation with --platform --platform manylinux2014_aarch64, and I can see the response and the statusCode is 200:

{
    "StatusCode": 200,
    "ExecutedVersion": "$LATEST"
}

Could you clarify if there are any other changes on your end in the code so we can reproduce it? Did you enable tracer and saw this exception?

[ari-luokkala]

Hi,

that seems to do the trick, thanks for swift response.

I will close this.

Best, Ari