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What is cron doing under the covers that could cause this error?

I've ruled out that php artisan schedule:run is the cause since I can run it manually and everything's fine. This means it's something within cron.

What is cron doing under the covers that could cause this error?

crond: can't set groups: Operation not permitted 

I didn't change anything else as part of the upgrade. What causes this error?

3/3/2017 10:39:00 AMcrond: can't set groups: Operation not permitted 3/3/2017 10:39:00 AMcrond: USER www-data pid 1562 cmd php /var/www/html/artisan schedule:run 3/3/2017 10:40:00 AMcrond: can't set groups: Operation not permitted 3/3/2017 10:40:00 AMcrond: USER www-data pid 1563 cmd php /var/www/html/artisan schedule:run 3/3/2017 10:41:00 AMcrond: can't set groups: Operation not permitted 3/3/2017 10:41:00 AMcrond: USER www-data pid 1564 cmd php /var/www/html/artisan schedule:run 3/3/2017 10:42:00 AMcrond: can't set groups: Operation not permitted 3/3/2017 10:42:00 AMcrond: USER www-data pid 1565 cmd php /var/www/html/artisan schedule:run 3/3/2017 10:43:00 AMcrond: can't set groups: Operation not permitted 3/3/2017 10:43:00 AMcrond: USER www-data pid 1566 cmd php /var/www/html/artisan schedule:run 

The command being run is a Laravel artisan command. It's run every minute allowing other scheduled work to be completed within the application itself. There's nothing in this command that writes to any files or anything like that. The scheduled work talks to a database and sends some email. Application logs are sent to stdout since it's a Docker container.

cron is run in a container with the command crond -f -d 8. Here's the Dockerfile:

# This container should be used for any/all CLI processes # including cron, queues, etc. FROM php:7.1-alpine # Copy the application files to the container ADD . /var/www/html WORKDIR /var/www/html # fix permissions in CI RUN sed -ri 's/^www-data:x:82:82:/www-data:x:1000:1000:/' /etc/passwd \ && sed -ri 's/^www-data:x:82:/www-data:x:1000:/' /etc/group # Install Composer dependencies RUN apk add --update --no-cache git zip unzip \ # needed for spatie/laravel-backup mysql-client \ # needed for gd libpng-dev libjpeg-turbo-dev \ && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* RUN docker-php-ext-install pdo_mysql gd \ # needed for forking processes in laravel queues as of Laravel 5.3 pcntl # Ownership of the app dir for www-data RUN chown -R www-data:www-data /var/www/html /home/www-data/ # Put php artisan schedule:run in a crontab RUN echo "* * * * * php /var/www/html/artisan schedule:run" > /etc/crontabs/www-data # Make sure when users get into the container they aren't root USER www-data 

What is cron doing under the covers that could cause this error?