PHP error category
PHP-FPM
FastCGI process management.
PHP-FPM errors arise when fastcgi process management affect an executing PHP application or its supporting service. Use the exact signature and runtime context to narrow the cause before changing configuration.
The guides in this category separate code defects from environment differences, show focused diagnostics, and favor site-scoped corrections that preserve unrelated applications.
Guides in this category
| Title | Pattern | Severity |
|---|---|---|
| 502 Bad Gateway from PHP-FPM | 502 Bad Gateway |
error |
| Allowed memory size exhausted | Fatal error: Allowed memory size of %d bytes exhausted (tried to allocate %d bytes) in %s on line %d |
fatal |
| Maximum execution time exceeded | Fatal error: Maximum execution time of %d seconds exceeded in %s on line %d |
fatal |
| PHP-FPM address already in use | ERROR: unable to bind listening socket for address '%s:9000': Address already in use |
error |
| PHP-FPM pool seems busy | WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers) |
warning |
| PHP-FPM Primary script unknown | Primary script unknown |
error |
| PHP-FPM server reached pm.max_children | WARNING: [pool www] server reached pm.max_children setting (5), consider raising it |
warning |
| PHP-FPM slowlog permission denied | ERROR: failed to open slowlog (/var/log/php-fpm/www-slow.log): Permission denied |
error |