zend.opcache: Warning Internal error: wrong size calculation

[HannahVernon]

Description

zend.OPCache on PHP 8.3.8 NTS on Win32 is throwing the following error repeatedly, even after clearing the cache:

Warning Internal error: wrong size calculation: C:\path-to-cache\cache\docket-cache\93da65a9fd00-b287b31d338a.php start=0x000002c2ee401040, end=0x000002c2ee472590, real=0x000002c2ee468e30

The 93da65a9fd00-b287b31d338a.php file is listed as zero size in the cache folder. Deleting the file results in opcache recreating it, again with zero size.

The php.ini section dealing with opcache settings:

[opcache]
opcache.enable=1
opcache.enable_cli=0
opcache.memory_consumption=256
opcache.interned_strings_buffer=16
opcache.max_accelerated_files=10000
opcache.max_wasted_percentage=5
opcache.use_cwd=1
opcache.validate_timestamps=1
opcache.revalidate_freq=2
opcache.revalidate_path=0
opcache.save_comments=1
opcache.record_warnings=0
opcache.enable_file_override=1
opcache.optimization_level=0x7FFEBFFF
;opcache.dups_fix=0
;opcache.blacklist_filename=
;opcache.max_file_size=0
;opcache.consistency_checks=0
opcache.force_restart_timeout=180
opcache.error_log=C:\windows\temp\php_opcache_err.log
opcache.log_verbosity_level=2
;opcache.preferred_memory_model=
;opcache.protect_memory=0
;opcache.restrict_api=
;opcache.mmap_base=
;opcache.cache_id=
opcache.file_cache=C:\windows\temp\php_op_cache
;opcache.file_cache_only=0
;opcache.file_cache_consistency_checks=1
opcache.file_cache_fallback=1
;opcache.huge_code_pages=1
;opcache.validate_permission=0
;opcache.validate_root=0
;opcache.opt_debug_level=0
;opcache.preload=
;opcache.preload_user=
;opcache.file_update_protection=2
;opcache.lockfile_path=/tmp

PHP Version

PHP 8.3.8 NTS Win32 x64

Operating System

Windows Server 2022 Standard 21H2, build 20348.2527

[iluuu1994]

Hi @HannahVernon! Can you reproduce the warning with a small script? Otherwise, it will be very hard to diagnose the issue.

[HannahVernon]

The file it is currently reporting as problematic is:

c90c7b354245-f3472753e77b.zip

This is the error around that particular file:

Sat Jun 22 17:56:29 2024 (10096): Warning Internal error: wrong size calculation: C:\path-to-file\docket-cache\c90c7b354245-f3472753e77b.php start=0x0000022afa0e7ec0, end=0x0000022afa0e8a28, real=0x0000022afa0e88f8

Contents of the file are:

<?php 
return array (
  'timestamp' => 1719096989,
  'site_id' => 1,
  'group' => 'term-queries',
  'key' => 'get_terms:c8817434f2120651a8ea3b4f240431ab:0.37558700 1719092969',
  'type' => 'array',
  'timeout' => 1719183389,
  'data' => 
  array (
    0 => 
    (object) array(
       'term_id' => 10,
       'object_id' => 3,
    ),
    1 => 
    (object) array(
       'term_id' => 13,
       'object_id' => 3,
    ),
    2 => 
    (object) array(
       'term_id' => 12,
       'object_id' => 3,
    ),
    3 => 
    (object) array(
       'term_id' => 11,
       'object_id' => 3,
    ),
  ),
);
/*@DOCKET_CACHE_EOF*/

Unfortunately I'm quite new to opcache, so I'm not entirely sure how to test that file, or indeed if the problem is with WordPress' Docket Cache plugin itself.

[nielsdos]

I've tried on a couple of different occasions to reproduce this issue with no luck. If I had to take a guess the underlying issue is actually memory corruption somewhere resulting in this behaviour. The difference in sizes is quite significant.
It would be interesting to know if this still happens, and if this still happens reliably when the USE_ZEND_ALLOC=0 variable environment and opcache.protect_memory=1 INI option are set.

[iluuu1994]

Sorry, I guess I forgot to comment but I was also unable to reproduce this back when this was commented.

[github-actions]

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