Laravel eats all memory until php is out of memory

SOLVED See my answer below.

Hi everyone,

I have set up an AWS EC2-Instance (t2.xlarge) with 16 Gib of Memory using forge and deployed my project via bitbucket. Everything works fine until a few hours later: The server was out of memory totally failed - site down. After that I destroyed the server and set up a new one, because I had thought, that maybe I miss configured ngnix or something else. But since now I recreated 4 instances!! Because after 3-4 hours the server runs out of memory again. I've googled a lot and tried to solve it on my one for like 2 days. But I can't find something. I've read about a memory leak in the laravel queues, but even when I don't start any queue workers with forge, the "memory eater" is still somewhere there.

I never had this problem before, when I deployed other laravel projects to AWS or DigitalOcean.

There is a big PHP Class, which provides logic to build price calendars based on accommodations and other services. The class handles a lot of eloquent objects in a quick time (which works great by the way). All eloquent objects have eager loaded nested relations with a maximum deep of 2. Is it possible, that this script consumes memory and don't release it after it's finished? But never had such a problem before in many php projects (even non laravel ones)...

Or can a wrong configured ngnix file cause this problem?

Here is my ngnix config (generated by forge):

# FORGE CONFIG (DO NOT REMOVE!)
include forge-conf/mydomain.com/before/*;

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name mydomain.com www.mydomain.com subdomain.mydomain.com;
    root /home/forge/mydomain.com/public;

    # FORGE SSL (DO NOT REMOVE!)
    ssl_certificate /etc/nginx/ssl/mydomain.com/541460/server.crt;
    ssl_certificate_key /etc/nginx/ssl/mydomain.com/541460/server.key;

    ssl_protocols TLSv1.2;
    ssl_ciphers A-LONG-KEY
    ssl_prefer_server_ciphers on;
    ssl_dhparam /etc/nginx/dhparams.pem;

    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;

    # FORGE CONFIG (DO NOT REMOVE!)
    include forge-conf/mydomain.com/server/*;

    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; }

    access_log off;
    error_log  /var/log/nginx/mydomain.com-error.log error;

    error_page 404 /index.php;

    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
        fastcgi_index index.php;
        include fastcgi_params;
    }

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

# FORGE CONFIG (DO NOT REMOVE!)
include forge-conf/mydomain.com/after/*;

And here are my PHP FPM Configs:

[PHP]
engine = On
short_open_tag = Off
precision = 14
output_buffering = 4096
zlib.output_compression = Off
implicit_flush = Off
unserialize_callback_func =
serialize_precision = -1
disable_functions = pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,
disable_classes =
zend.enable_gc = On

expose_php = Off

max_execution_time = 30
max_input_time = 60

memory_limit = 512M

error_reporting = E_ALL
display_errors = On
display_startup_errors = Off

log_errors = On
log_errors_max_len = 1024

ignore_repeated_errors = Off
ignore_repeated_source = Off

report_memleaks = On

html_errors = On

variables_order = "GPCS"
request_order = "GP"
register_argc_argv = Off

auto_globals_jit = On

post_max_size = 8M

auto_prepend_file =
auto_append_file =

default_mimetype = "text/html"
default_charset = "UTF-8"

doc_root =
user_dir =

enable_dl = Off

cgi.fix_pathinfo=0

file_uploads = On
upload_max_filesize = 2M
max_file_uploads = 20

allow_url_fopen = On
allow_url_include = Off
default_socket_timeout = 60

[CLI Server]
cli_server.color = On

[Date]
date.timezone = UTC

[Pdo_mysql]
pdo_mysql.cache_size = 2000
pdo_mysql.default_socket=

[mail function]
SMTP = localhost
smtp_port = 25
mail.add_x_header = Off

[ODBC]
odbc.allow_persistent = On
odbc.check_persistent = On
odbc.max_persistent = -1
odbc.max_links = -1
odbc.defaultlrl = 4096
odbc.defaultbinmode = 1

[Interbase]
ibase.allow_persistent = 1
ibase.max_persistent = -1
ibase.max_links = -1
ibase.timestampformat = "%Y-%m-%d %H:%M:%S"
ibase.dateformat = "%Y-%m-%d"
ibase.timeformat = "%H:%M:%S"

[MySQLi]
mysqli.max_persistent = -1
mysqli.allow_persistent = On
mysqli.max_links = -1
mysqli.cache_size = 2000
mysqli.default_port = 3306
mysqli.default_socket =
mysqli.default_host =
mysqli.default_user =
mysqli.default_pw =
mysqli.reconnect = Off

[mysqlnd]
mysqlnd.collect_statistics = On
mysqlnd.collect_memory_statistics = Off

[PostgreSQL]
pgsql.allow_persistent = On
pgsql.auto_reset_persistent = Off
pgsql.max_persistent = -1
pgsql.max_links = -1
pgsql.ignore_notice = 0
pgsql.log_notice = 0

[bcmath]
bcmath.scale = 0



[Session]
session.save_handler = files
session.use_strict_mode = 0
session.use_cookies = 1
session.use_only_cookies = 1
session.name = PHPSESSID
session.auto_start = 0
session.cookie_lifetime = 0
session.cookie_path = /
session.cookie_domain =
session.cookie_httponly =
session.serialize_handler = php
session.gc_probability = 0
session.gc_divisor = 1000
session.gc_maxlifetime = 1440
session.referer_check =
session.cache_limiter = nocache
session.cache_expire = 180
session.use_trans_sid = 0
session.sid_length = 26
session.trans_sid_tags = "a=href,area=href,frame=src,form="
session.sid_bits_per_character = 5

[Assertion]
zend.assertions = -1

[Tidy]
tidy.clean_output = Off

[soap]
soap.wsdl_cache_enabled=1
soap.wsdl_cache_dir="/tmp"
soap.wsdl_cache_ttl=86400
soap.wsdl_cache_limit = 5

[ldap]
ldap.max_links = -1