Bug #69885 [NEW]: (unexpecteadly) Increasing wasted memory when file are removed

From: maxence at typhon dot com Operating system: Debian 7 PHP version: 5.6.10 Package: opcache Bug Type: Bug Bug description:(unexpecteadly) Increasing wasted memory when file are removed Description: ------------ PHP 5.6.10 from tarbal, compiled with : ./configure --disable-all --prefix=/usr/local/php-5.6.10 --enable-fpm --enable-ctype --enable-mbstring --enable-gd-native-ttf --enable-zip --with-mcrypt --with-openssl --with-gd --with-jpeg-dir=/usr/lib --with-freetype-dir --with-curl --with-pcre-regex --with-gettext --enable-pdo --with-pdo-mysql=mysqlnd --with-iconv --enable-fileinfo --enable-filter --enable-json --enable-session --enable-hash --enable-libxml --enable-dom --enable-libxml --enable-simplexml --enable-bcmath --enable-soap --enable-opcache --enable-ftp --enable-intl opcache config is : opcache.blacklist_filename => no value => no value opcache.consistency_checks => 0 => 0 opcache.dups_fix => Off => Off opcache.enable => On => On opcache.enable_cli => Off => Off opcache.enable_file_override => Off => Off opcache.error_log => no value => no value opcache.fast_shutdown => 1 => 1 opcache.file_update_protection => 2 => 2 opcache.force_restart_timeout => 180 => 180 opcache.inherited_hack => On => On opcache.interned_strings_buffer => 16 => 16 opcache.load_comments => 1 => 1 opcache.log_verbosity_level => 4 => 4 opcache.max_accelerated_files => 30000 => 30000 opcache.max_file_size => 0 => 0 opcache.max_wasted_percentage => 5 => 5 opcache.memory_consumption => 1024 => 1024 opcache.optimization_level => 0xFFFFFFFF => 0xFFFFFFFF opcache.preferred_memory_model => no value => no value opcache.protect_memory => 0 => 0 opcache.restrict_api => no value => no value opcache.revalidate_freq => 2 => 2 opcache.revalidate_path => Off => Off opcache.save_comments => 1 => 1 opcache.use_cwd => On => On opcache.validate_timestamps => On => On We used to remove a lot of php files from time to time (~ 70Mb) when releasing, without any manual opcache flush or php restart. Every time we remove the files, the same amount of space is added to wasted_memory. Looks like opcache does not reclaim the memory when the file is removed (and then recreated) but only put it as "wasted". Also, the memory wasted is far bigger than the configured 5%, and opcache doesn't restart. I achieved to reproduce this in a simple test (see below). Note that the sleep time matters. With "sleep 3", the wasted memory increase after every cycle. With "sleep 2", it only increases every ~ 2 times, which let me think the issue has something to do with the revalidate process (and revalidate_freq). Test script: --------------- # for i in $(seq 1 100);do rm -f /var/www/web-default/a.php && echo '<? echo("hi"); ?>' > /var/www/web-default/a.php; sleep 3; curl -s http://127.0.0.1/a.php >/dev/null; curl -s http://127.0.0.1/opcache_stat.php |grep wasted_memory;done Expected result: ---------------- wasted memory should not increase, so something like : "wasted_memory": 72192, "wasted_memory": 72192, "wasted_memory": 72192, "wasted_memory": 72192, Actual result: -------------- wasted memory increase for the same size every time. "wasted_memory": 72192, "wasted_memory": 72960, "wasted_memory": 73728, "wasted_memory": 74496, "wasted_memory": 75264 -- Edit bug report at https://bugs.php.net/bug.php?id=69885&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=69885&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=69885&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=69885&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=69885&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=69885&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=69885&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=69885&r=needscript Try newer version: https://bugs.php.net/fix.php?id=69885&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=69885&r=support Expected behavior: https://bugs.php.net/fix.php?id=69885&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=69885&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=69885&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=69885&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=69885&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=69885&r=dst IIS Stability: https://bugs.php.net/fix.php?id=69885&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=69885&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=69885&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=69885&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=69885&r=mysqlcfg