Bug #72517 [NEW]: file_exists(), is_file() and stat() report wrong result

From: stgrein at gmail dot com Operating system: PHP version: 7.0.8 Package: Filesystem function related Bug Type: Bug Bug description:file_exists(), is_file() and stat() report wrong result Description: ------------ Hi, functions which check if a file exists do report wrong results sometimes. I did not find a special pattern, but maybe higher load is triggering it more. The chance on my machine is around ~1% to hit the bug per function call. I am using PHP v7.0.8 now but also had this bug on PHP v7.0.7. I did not test with earlier Versions. Test script: --------------- <?php //check an existing file $a = file_exists("/this/file/exists"); if($a === true) { echo "File exists!"; //expected } else { echo "File does NOT exists!"; //bug hit } //expected output: //File exists! //chance to get this output is around 1% on my machine under load //File does NOT exists! -- Edit bug report at https://bugs.php.net/bug.php?id=72517&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72517&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72517&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72517&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72517&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72517&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72517&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72517&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72517&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72517&r=support Expected behavior: https://bugs.php.net/fix.php?id=72517&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72517&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72517&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72517&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72517&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72517&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72517&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72517&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72517&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72517&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72517&r=mysqlcfg