From:
Operating system: Linux
PHP version: 5.3.6
Package: *Directory/Filesystem functions
Bug Type: Bug
Bug description:incorrect accounting for realpath_cache_size
Description:
------------
When items are removed from the realpath_cache, if the path is the same as
the
realpath, then the incorrect size is subtracted from realpath_cache_size.
This is due to the "realpath_cache_add" function. If the realpath and the
path are
the same, then an optimization occurs where bucket->realpath is assigned to
the
same location as bucket->path (so there's no copy being done). The size
added to
realpath_cache_size takes this into account, but not when removing.
This can cause the size to be incorrect and also be negative.
I've submitted a patch and some test code.
Test script:
---------------
<?php
// set the ini options to more easily reproduce
// realpath_cache_ttl = 1
// realpath_cache_siz = 16K
for($i = 0; $i < 5000; $i++) {
file_put_contents("/tmp/foo-$i.txt", "");
clearstatcache(true, "/tmp/foo-$i.txt");
echo "$i - stat cache is: ".realpath_cache_size()."\n";
if(realpath_cache_size() < 0) {
print "Hit realpath_cache_size bug\n";
break;
}
}
// clean up created files
for ($x = 0; $x < $i; $x++) {
unlink("/tmp/foo-$x.txt");
}
Expected result:
----------------
If bug is present it should output 'Hit realpath_cache_size bug'
--
Edit bug report at http://bugs.php.net/bug.php?id=54866&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=54866&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=54866&r=trysnapshot53
Try a snapshot (trunk):
http://bugs.php.net/fix.php?id=54866&r=trysnapshottrunk
Fixed in SVN:
http://bugs.php.net/fix.php?id=54866&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=54866&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=54866&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=54866&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=54866&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=54866&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=54866&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=54866&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=54866&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=54866&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=54866&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54866&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=54866&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=54866&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=54866&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=54866&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=54866&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=54866&r=mysqlcfg
