Websites on PHP 7.4 and PHP 8.0 are inaccessible on CloudLinux OS: 504 Gateway Time-out

Ivan Kamnev

Updated January 13, 2026 19:01

kb: bug kb: fixed Plesk for Linux

Applicable to:

Websites that are using PHP 7.4 and PHP 8.0 are inaccessible on CloudLinux OS with the error below:

CONFIG_TEXT: 504 Gateway Time-out
PHP 7.4 and PHP 8.0 master process consumes 100% of CPU.
The following error can be found in /var/log/plesk-php74-fpm/error.log file:

CONFIG_TEXT: WARNING: [pool example.com] child 1335278 said into stderr: "ERROR: [pool example.com] CageFS jail error Failed to initialize lve library instance: No such file or directory: No such file or directory (2)"
WARNING: [pool example.com] child 1335278 said into stderr: "ERROR: [pool example.com] child failed to initialize"
ERROR: [pool example.com] Error on LVE enter: LVE(10022)

CONFIG_TEXT: WARNING: [pool example.com] child 3682835 said into stderr: "ERROR: [pool example.com] CageFS jail error Failed to initialize lve library instance: Operation not permitted: Operation not permitted (1)", pipe is closed
WARNING: [pool example.com] child 3682835 said into stderr: "ERROR: [pool example.com] child failed to initialize", pipe is closed

Product issue:

#PPPM-13184 "In Plesk on CloudLinux with enabled CageFS and the latest PHP updates installed, PHP 7.4. and 8.0 no longer consume all the CPU."
Fixed in:
- PHP Updates 31 August 2021 (Linux)

Please consider updating your server:

For CloudLinux 7

For PHP 7.4

Log into the server via SSH.
Run the command to open PHP 7.4 configuration file:

# systemctl edit plesk-php74-fpm.service
Add the line below:

CONFIG_TEXT: [Service]
PrivateDevices=false
Save changes.
Run the command below to apply the changes:

# systemctl restart plesk-php74-fpm.service

For PHP 8.0

Log into the server via SSH.
Run the command to open PHP 8.0 configuration file:

# systemctl edit plesk-php80-fpm.service
Add the line below:

CONFIG_TEXT: [Service]
PrivateDevices=false
Save changes.
Run the command below to apply the changes:

# systemctl restart plesk-php80-fpm.service

Note: in case top command shows that one of the process uses 1
# kill

For CloudLinux 8

For PHP 7.4

Log into the server via SSH.
Run the command to open PHP 7.4 configuration file:

# systemctl edit plesk-php74-fpm.service
Add the lines below:

CONFIG_TEXT: [Service]
PrivateDevices=false
RestrictNamespaces=false
Save changes.
Run the command below to apply the changes:

# systemctl restart plesk-php74-fpm.service

For PHP 8.0

Log into the server via SSH.
Run the command to open PHP 8.0 configuration file:

# systemctl edit plesk-php80-fpm.service
Add the line below:

CONFIG_TEXT: [Service]
PrivateDevices=false
RestrictNamespaces=false
Save changes.
Run the command below to apply the changes:

# systemctl restart plesk-php80-fpm.service

Note: in case after applying the steps above the previously created master PHP process still highly consumes CPU follow the steps:

Run top utility to find the affected PHP master process:
Using the ID from the previous step, kill affected process with the command:

# kill -9 1151803