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Bug #68565 Counter for wasted memory in Opcache is only int
Submitted: 2014-12-08 12:01 UTC Modified: 2015-05-15 12:11 UTC
Votes:1
Avg. Score:1.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: kontakt at adrianslowik dot pl Assigned: cmb (profile)
Status: Closed Package: opcache
PHP Version: 5.5.19 OS: Not relevant / Linux Gentoo
Private report: No CVE-ID: None
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From: kontakt at adrianslowik dot pl
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 [2014-12-08 12:01 UTC] kontakt at adrianslowik dot pl
Description:
------------
When I set opcache.memory_consumption to 10240 (10Gb), it is possible to have more than 2Gb of wasted memory.

The Wasted memory variable in code is stored in signed int instead of size_t.

In fact I end up with negative amount of wasted memory and wasted memory percentage, which is less than default 5% for scheduling the reload.

To replicate the problem set the opcache.memory_consumption to high value (3Gb)
Use opcache_compile_file and opcache_invalidate in loop with the same file until wasted memory rises above 2Gb

php.ini settings:

opcache.enable=1
opcache.enable_cli=0
opcache.memory_consumption=10240
opcache.interned_strings_buffer=16
opcache.max_accelerated_files=1048793
opcache.max_wasted_percentage=5
opcache.use_cwd=1
opcache.validate_timestamps=0
opcache.revalidate_freq=2
opcache.revalidate_path=1
opcache.save_comments=1
opcache.load_comments=1
opcache.error_log=/var/log/php-fpm.opcache.log
opcache.log_verbosity_level=1



Patches

wasted_shared_memory_int_to_size_t (last revision 2014-12-08 12:02 UTC by kontakt at adrianslowik dot pl)

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History

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 [2015-05-15 12:11 UTC] cmb@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: cmb
 [2015-05-15 12:11 UTC] cmb@php.net
The PR has been merged into master: <https://github.com/php/php-src/commit/999545258308effa49fde71b7af7fdd991256e3a>. Therefore closing.
 
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