From: johnkarl at nbnet dot nb dot ca
Operating system: Windows 2000 Professional SP4
PHP version: 5.0.1
PHP Bug Type: XML related
Bug description: passing empty string to xml_parser_create causes 100% CPU utilization
Description:
------------
In PHP5, if xml_parser_create is called with an empty string as the
character encoding parameter, a server will utilize 100% of the CPU.
Restarting Apache will sometimes cause the system to revert to normal, but
usually a reboot is needed.
In PHP4, calling xml_parser_create("") will cause Expat to autodetect the
character encoding. In the user comments of www.php.net, this is
purportedly true of PHP5 as well; however this is not the case.
This problem has been reproduced on a number of other machines as well.
I'm not sure if the same happens with IIS.
Reproduce code:
---------------
$parser = xml_parser_create("");
Expected result:
----------------
a reference to the parser should be returned
Actual result:
--------------
Apache stalls, 100% CPU usage
--
Edit bug report at http://bugs.php.net/?id=30186&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=30186&r=trysnapshot4
Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=30186&r=trysnapshot50
Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=30186&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=30186&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=30186&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=30186&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=30186&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=30186&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=30186&r=support
Expected behavior: http://bugs.php.net/fix.php?id=30186&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=30186&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=30186&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=30186&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=30186&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=30186&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=30186&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=30186&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=30186&r=float
MySQL Configuration Error: http://bugs.php.net/fix.php?id=30186&r=mysqlcfg
