cloudwatch_lambda_agent error using latest python images

[Morgadoooo]

Hi — apologies if this is the wrong repo.

Since the latest AWS Lambda base images were published, we’re seeing repeated error logs inside our Lambdas:

[2025-11-25T23:11:17.882Z ERROR cloudwatch_lambda_agent::utilities::cgroupfs] 
Error while reading memory.stat for path /sys/fs/cgroup/memory/memory.stat: 
No such file or directory (os error 2)

This error appears with the newest image tags, but does not occur with older images such as:

• public.ecr.aws/lambda/python:3.11.2025.11.22.10-x86_64 with

RUN curl -O https://lambda-insights-extension.s3-ap-northeast-1.amazonaws.com/amazon_linux/lambda-insights-extension.rpm && \
    rpm -U lambda-insights-extension.rpm && \
    rm -f lambda-insights-extension.rpm

• public.ecr.aws/lambda/python:3.12.2025.11.22.10-x86_64 with

RUN curl -O https://lambda-insights-extension.s3-ap-northeast-1.amazonaws.com/amazon_linux/lambda-insights-extension.rpm && \
    rpm -U lambda-insights-extension.rpm && \
    rm -f lambda-insights-extension.rpm

Repro steps (what we did):

• Pull latest image (e.g. public.ecr.aws/lambda/python:3.11) and run a simple Lambda that initializes the CloudWatch agent.

• Observe repeated memory.stat read errors in the logs.

• Repeat with the older image tag listed above — no such errors appear.

Expected behavior: no memory.stat read errors in normal Lambda container environment.

Actual behavior: repeated cloudwatch_lambda_agent::utilities::cgroupfs errors about missing /sys/fs/cgroup/memory/memory.stat.

Environment details:

• Images tested: latest published Lambda base images (tags pushed recently)

• Images that do not show the error: public.ecr.aws/lambda/python:3.11.2025.11.22.10-x86_64, public.ecr.aws/lambda/python:3.12.2025.11.22.10-x86_64

Thanks for any guidance — happy to provide more info or help debug.