Bug #69136 [Com]: Session file empty when session-path on NFS mount

Edit report at https://bugs.php.net/bug.php?id=69136&edit=1 ID: 69136 Comment by: sprunka at gmail dot com Reported by: maggus dot staab at googlemail dot com Summary: Session file empty when session-path on NFS mount Status: Feedback Type: Bug Package: Session related Operating System: Ubuntu 14 LTS PHP Version: 5.6.6 Assigned To: yohgaki Block user comment: N Private report: N New Comment: Two separate vagrant VM instances. 1) CentOS release 6.5 (Final) PHP 5.6.17 Session save path is shared with host machine via vagrant default sync settings (not NFS, SMB, RSync, or VirtualBox) 2) CentOS release 6.7 (Final) PHP 5.6.17 (Also tested with PHP 7 -- not sure which build, ame problem existed) Session save path is shared with host machine via vagrant default sync settings (not NFS, SMB, RSync, or VirtualBox) However, I have also tried this setup using the NFS sync type and it also failed. Previous Comments: ------------------------------------------------------------------------ [2016-01-17 07:39:23] yohgaki@php.net Sorry for the delay, but I couldn't reproduce this on my Fedora23 and CentOS7. "files" handler is working as it should. Do you have this issue still? I think you have some kind of permission issue such as you are writing session data by multiple user IDs. It wouldn't work with multiple user IDs or root ID. ------------------------------------------------------------------------ [2015-03-28 21:14:18] yohgaki@php.net Locking under shared directory is unreliable. I guess this is the reason why. Better approach to share sessions across servers is to use databases/caches like memcached/mongodb/redis/etc. Anyway, I may look into details... ------------------------------------------------------------------------ [2015-02-27 11:08:28] me at kelunik dot com Same thing happens with a NTFS partition mounted with under Ubuntu 14.10 ntfs defaults,umask=0000,permissions,uid=1000 0 0. ------------------------------------------------------------------------ [2015-02-27 10:59:29] maggus dot staab at googlemail dot com 1) I dont understand why the session cannot be written, since I checked is_dir, is_writable and is_readable beforehand. Even setting the dir to "0777" makes it work. 2) when basic things like writing a session doesnt work, I would expect a ERROR instead of a WARNING ------------------------------------------------------------------------ [2015-02-27 10:56:47] maggus dot staab at googlemail dot com Description: ------------ php -v PHP 5.6.5-1+deb.sury.org~trusty+1 Test script: --------------- <?php $path = '/path/to/a/dir/mounted/via/nfs/'; if (!is_dir($path) || !is_writable($path) || !is_readable($path)) { throw new Exception("$path is not a proper dir"); } //ini_set("session.save_path", $path); // neither this works session_save_path($path); // nor this does session_start(); $_SESSION['cnt'] = $_SESSION['cnt']+1; var_dump($_SESSION['cnt']); if ($_SESSION['cnt'] > 1) { echo "<h1>WORKS</h1>"; session_destroy(); } exit(); Expected result: ---------------- on each 2nd request "WORKS" is printed. Actual result: -------------- session is not persisted. session file gets created but does not contain any content. therefore subsequent calls will never echo "WORKS" because session cannot be continued. with default Ubuntu php.ini a error/warning doesnt show up at all. After adding ini_set("display_errors", "On"); error_reporting(E_ALL); I get a warning "Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/XX..ZZ..YY/tmp/www/session/) in Unknown on line 0" ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=69136&edit=1