php system_error ai_generated true

Warning: PHP Startup: Unable to allocate interned strings buffer: 2097152 bytes in Unknown on line 0

ID: php/opcache-interned-strings-buffer

Also available as: JSON · Markdown · 中文
90%Fix Rate
88%Confidence
1Evidence
2023-08-22First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
PHP 8.0 active — — —
PHP 8.1 active — — —
PHP 8.2 active — — —
PHP 8.3 active — — —
OPcache 8.0 active — — —
OPcache 8.1 active — — —

Root Cause

OPcache's interned strings buffer is too large for the available shared memory, typically due to a misconfigured `opcache.interned_strings_buffer` value exceeding the system's shared memory limits.

generic

中文

OPcache 的内部字符串缓冲区太大，超出了可用的共享内存，通常是由于 `opcache.interned_strings_buffer` 配置值超过了系统的共享内存限制。

Official Documentation

https://www.php.net/manual/en/opcache.configuration.php#ini.opcache.interned-strings-buffer

Workarounds

  1. 90% success Reduce `opcache.interned_strings_buffer` in php.ini to a smaller value, e.g., from 16 to 8: `opcache.interned_strings_buffer = 8` 
    Reduce `opcache.interned_strings_buffer` in php.ini to a smaller value, e.g., from 16 to 8: `opcache.interned_strings_buffer = 8`
  2. 75% success Increase the system shared memory limit by modifying `/etc/sysctl.conf` with `kernel.shmmax = 2147483648` and `kernel.shmall = 2097152`, then reload with `sysctl -p`. 
    Increase the system shared memory limit by modifying `/etc/sysctl.conf` with `kernel.shmmax = 2147483648` and `kernel.shmall = 2097152`, then reload with `sysctl -p`.
  3. 85% success Check available shared memory with `ipcs -lm` and adjust `opcache.interned_strings_buffer` to a value that fits within the system limits; a safe starting point is 4 MB. 
    Check available shared memory with `ipcs -lm` and adjust `opcache.interned_strings_buffer` to a value that fits within the system limits; a safe starting point is 4 MB.

中文步骤

  1. 在 php.ini 中将 `opcache.interned_strings_buffer` 减小到较小的值，例如从 16 改为 8：`opcache.interned_strings_buffer = 8`
  2. 通过修改 `/etc/sysctl.conf` 增加系统共享内存限制：`kernel.shmmax = 2147483648` 和 `kernel.shmall = 2097152`，然后使用 `sysctl -p` 重新加载。
  3. 使用 `ipcs -lm` 检查可用共享内存，并将 `opcache.interned_strings_buffer` 调整为适合系统限制的值；安全起始值为 4 MB。

Dead Ends

Common approaches that don't work:

  1. 95% fail

    The error is about allocation failure; increasing the value increases memory demand.

  2. 60% fail

    The error only affects startup; disabling OPcache is unnecessary if the buffer size is adjusted.

  3. 90% fail

    The issue is a persistent configuration problem, not a transient system state.