Laravel application hang on Google Cloud Run but runs fine on home setup

I am testing out Google Cloud Run as a platform to run a new project. Project is developed using NodeJS and Laravel. Created a docker images based on php-fpm. This image runs fine on my dev environment running Ubuntu 21.04 and Docker 20.10.8. When running the same image deployed on Google Cloud Run the application hangs randomly. I have narrowed it down to a specific line in imported symfony http send function, class called from laravel index.php. Application will hang a function call to fast_cgi_finish_request(). It will hang on that line 70% of cases and call to timeout after 300 seconds when nginx times out.

Hanging line in ./vendor/symfony/http-foundation/Response.php:

    public function send() {
        $this->sendHeaders();
        $this->sendContent();

        if (\function_exists('fastcgi_finish_request')) {
            /* This line hangs 70% of the time. */
            fastcgi_finish_request();
        } elseif (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true)) {
            static::closeOutputBuffers(0, true);
        }
        return $this;
    }

Since the same image works on other environments this is specific to Google Cloud Run enviornment. My current guess is some runtime resource since application can respond fine 1-10 times before haning application start to hang.

Any thoughts on how to debug this running in Google Cloud Run platform? I am feeling fairly limited in my debugging options at the moment. Let me know if more details are needed from setup.

Environment passed in to Laravel:

  APP_LOG: errorlog
  APP_URL: ...
  APP_ENV: testing
  APP_KEY: ....
  APP_DEBUG: 'true'
  LOG_CHANNEL: 'stderr'
  CACHE_DRIVER: 'database'
  SESSION_DRIVER: 'database'
  DB...

Dockerfile:

FROM php:7.4-fpm as dev
# https://nginx.org/keys/nginx_signing.key
RUN apt-get update && apt-get install --no-install-recommends -y curl gnupg2 ca-certificates lsb-release && lsb_release && echo "deb http://nginx.org/packages/mainline/debian $(lsb_release -cs) nginx" > /etc/apt/sources.list.d/nginx.list && \
    curl -o /tmp/nginx_signing.key https://nginx.org/keys/nginx_signing.key && \
    mv /tmp/nginx_signing.key /etc/apt/trusted.gpg.d/nginx_signing.asc && \
    apt-get update && apt-get install --no-install-recommends -y libpq-dev && \
    docker-php-ext-install -j$(nproc) pdo_mysql pdo_pgsql && \
    apt-get update && apt-get install --no-install-recommends -y nginx

# ----------------------
# Composer install step
# ----------------------
FROM composer:1.10 as build

WORKDIR /app

COPY ./composer.* ./artisan ./
COPY ./database ./database
COPY ./nova-components ./nova-components
COPY ./nova ./nova

## autoload resources
COPY ./bootstrap ./bootstrap
COPY ./app ./app
COPY ./routes ./routes
COPY ./config ./config

RUN composer install \
        --no-dev \
        --no-progress \
        --no-suggest \
        --no-interaction \
        --optimize-autoloader \
        --prefer-dist && \
    composer dump-autoload

# ----------------------
# npm install step
# ----------------------
FROM node:14-alpine as node
WORKDIR /app

COPY ./*.json ./*.mix.js ./artisan /app/
COPY ./resources ./resources
COPY ./public ./public

RUN npm install && \
    npm run build

# ----------------------
# The FPM production container
# ----------------------
FROM dev

WORKDIR /app

COPY ./docker/www.conf /usr/local/etc/php-fpm.d/www.conf
COPY ./docker/nginx.conf /etc/nginx/nginx.conf
COPY ./docker/entrypoint.sh /
COPY ./docker/php.ini-development ./docker/php.ini-production $PHP_INI_DIR/

COPY ./ /app
COPY --from=build /app/vendor /app/vendor
COPY --from=node /app/public/js/ /app/public/js/
COPY --from=node /app/public/mix-manifest.json /app/public/mix-manifest.json

RUN chmod +x /entrypoint.sh && \
    rm -f /app/storage/logs/* /app/public/storage && \
    php /app/artisan storage:link && \
    mkdir /var/run/nginx && \
    chmod -R 777 /app/storage /app/app /app/public/app && \
    chown -R www-data:www-data /app/storage /app/app /app/public/app && \
    chown -R www-data:www-data /var/log/nginx /var/cache/nginx /var/run/nginx

USER www-data
ENTRYPOINT ["/entrypoint.sh"]

composer show:

64robots/nova-fields              0.18.0   A Laravel Nova field.
armincms/nova-tab                 4.0.2    A Laravel Nova tool.
bernhardh/nova-translation-editor 1.3.1    Laravel Nova translation editor
fideloper/proxy                   4.4.1    Set trusted proxies for Laravel
fruitcake/laravel-cors            v2.0.4   Adds CORS (Cross-Origin Resource Sharing) headers support in your Laravel application
gkermer/nova-text-auto-complete   0.0.5    A Laravel Nova text autocomplete field.
guzzlehttp/guzzle                 7.3.0    Guzzle is a PHP HTTP client library
intervention/image                2.6.0    Image handling and manipulation library with support for Laravel integration
laravel/framework                 v7.30.4  The Laravel Framework.
laravel/nova                      3.16.3   A wonderful administration interface for Laravel.
laravel/tinker                    v2.6.1   Powerful REPL for the Laravel framework.
listen/nova-flexible-content      dev-main Flexible Content & Repeater Fields for Laravel Nova.
listen/tree-view                  dev-main A Laravel Nova tool.
mcamara/laravel-localization      1.6.1    Easy localization for Laravel
ngiraud/nova-translatable-v2      1.0.4    A laravel-translatable extension for Laravel Nova. Inspired by optimistdigital/nova-translatable
optimistdigital/nova-settings     3.2.1    A Laravel Nova tool for editing custom settings using native Nova fields.
orangehill/iseed                  v3.0.1   Generate a new Laravel database seed file based on data from the existing database table.
silvanite/novatoolpermissions     v1.1.3   Laravel Nova Permissions (Roles and Permission based Access Control (ACL))
waynestate/nova-ckeditor4-field   0.7.0    This nova package allows you to use CKEditor 4 for text areas.
yassi/nova-nested-form            v3.0.12  A Laravel Nova package that allows you to create/update/delete nested related fields from a parent form.

nginx.conf:

pid /var/run/nginx/nginx.pid;
worker_processes auto;

events {
  worker_connections 1024;
}

http {
  include mime.types;
  #include fastcgi.conf;
  default_type application/octet-stream;
  sendfile on;
  tcp_nopush on;
  server_tokens off;
  client_max_body_size 10M;
  gzip on;
  gzip_disable "msie6";
  gzip_vary on;
  gzip_proxied any;
  gzip_comp_level 6;
  gzip_buffers 16 8k;
  gzip_http_version 1.1;
  gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;

  server {
    listen [::]:8080;
    listen 8080 default_server;
    server_name _;
    root /app/public;
    index  index.php index.html index.htm;
    access_log /dev/stdout;
    error_log /dev/stdout info;
    disable_symlinks off;

    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";

    index index.html index.htm index.php;
    charset utf-8;

    include includes/*.conf;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; }

    error_page 404 /index.php;

    location ~ ^/status|^/ping {
        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
    }
    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
        proxy_intercept_errors on;
        fastcgi_intercept_errors on;
        include fastcgi_params;
    }

    location ~ /\.(?!well-known).* {
        deny all;
    }
  }
}

source https://stackoverflow.com/questions/68951645/laravel-application-hang-on-google-cloud-run-but-runs-fine-on-home-setup