Edit report at https://bugs.php.net/bug.php?id=47640&edit=1
ID: 47640
Comment by: connie at jaygoss dot com
Reported by: manuel dot schmitt at manitu dot de
Summary: Session does not unlock file in /tmp/
Status: Open
Type: Bug
Package: Session related
Operating System: Linux
PHP Version: 5.2.9
Block user comment: N
Private report: N
New Comment:
I just encountered this bug on version 5.3.13. The script worked fine for about
a year, then stopped working for no known reason (no code changes, version
upgrades, etc.)
This script works:
echo "<br>Flock Test Without Session<br>";
$fp = fopen("_order_id.txt", "r+");
if (flock($fp, LOCK_EX)) {
/* do an exclusive lock to get an order number */
$id = fread($fp,filesize("_order_id.txt"));
$id++;
echo "<br>Got the lock, id is now $id";
ftruncate($fp, 0); /* truncate file */
rewind($fp); /* reset pointer */
fwrite($fp, $id); /* write new order id */
flock($fp, LOCK_UN); /* release the lock */
} else {
echo "Couldn't get the lock";
}
However, if I put the same code inside a session, it fails on my live site, but
still works fine in my localhost (version 5.3.8):
session_start();
echo "<br>Flock Test With Session<br>";
$fp = fopen("_order_id.txt", "r+");
if (flock($fp, LOCK_EX)) {
/* do an exclusive lock to get an order number */
$id = fread($fp,filesize("_order_id.txt"));
$id++;
echo "<br>Got the lock, id is now $id";
ftruncate($fp, 0); /* truncate file */
rewind($fp); /* reset pointer */
fwrite($fp, $id); /* write new order id */
flock($fp, LOCK_UN); /* release the lock */
} else {
echo "Couldn't get the lock";
}
session_destroy();
Previous Comments:
------------------------------------------------------------------------
[2012-09-12 03:14:57] aharvey@php.net
Explanation provided separately, since it's not relevant to this bug. Bug reopened.
------------------------------------------------------------------------
[2012-09-12 03:10:26] laruence@php.net
...maybe it's chagned by the reporter self, no action history log in the changes
tab
------------------------------------------------------------------------
[2012-09-11 20:39:24] kriscraig@php.net
Could somebody explain why the status was changed to "Not a bug?" I'm not seeing
anything in the comments to indicate why that edit was made. Looks like a real
bug to me and everything else seems to check-out, so I'm assuming that was an
error given the lack of an explanation.
I'm re-opening this with "Feedback" status. If you're the one who closed this
(the edit history is empty), please post a comment explaining your reasoning.
Thanks!
------------------------------------------------------------------------
[2012-05-27 01:04:29] bugs dot php dot net at jrs-s dot net
I worked around this problem by simply moving sessions from file storage to
memcache.
session.save_handler = memcache
session.save_path = "tcp://serv01:11211,tcp://serv02:11211,tcp://serv03:11211"
An application pool that had been creeping up to MaxCli (900 children apiece, in
this case) within a couple hours of a restart due to this FLOCK issue settled
down and has now been running happily for several days on fewer than 150
children per server. I highly recommend just NOT USING php's file based session
storage in the first place, because of exactly this issue.
------------------------------------------------------------------------
[2012-02-01 19:50:15] pio at rdl dot pl
Hello !
Is there any news with this issue ?
Piotr
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