From: chris at lodesys dot com
Operating system: Windows 2000
PHP version: 5.1.1
PHP Bug Type: Reproducible crash
Bug description: Extending Exception class causes random failures when
multi-threaded
Description:
------------
When running 2 or more requests simultaneously on my 850 MHz laptop,
including "class MyException extends Exception{}" to a simple Hello World
script causes Apache to crash randomly.
The setup is a stand alone 850 MHz laptop running Windows 2000,
Apache/1.3.34, PHP/5.1.1, and Apache's JMeter. Apache is configured with
ThreadsPerChild = 50 and PHP loaded as a module (LoadModule php5_module
c:/php/php5apache.dll).
Launching Apache's JMeter, I accessed the test script using single or
multiple threads, no timing pauses, and enough loops to drive the CPU load
to 100% (e.g., 1 thread/600 loops, 2 threads/300 loops, and 30 threads/20
loops).
Reproduce code:
---------------
<?php
class MyException extends Exception {
}
print("Hello World\n");
?>
Expected result:
----------------
Script should run without problem when accessed using 1 or multiple
threads.
Actual result:
--------------
Running single threaded access, there were no problems. When accessed
using multiple threads, there were consistent random failures of Apache.
For example, usually see around 7 crashes while running 600 requests with
30 threads.
Dr. Watson reports them as Exception number: c0000005 (access violation)
or occasionally Exception number: 000006a6 ().
Removing "class MyException extends Exception{}" from the script
eliminated the multi-thread crashing problem. All thread settings (1, 2 &
30) would run to completion without problems.
--
Edit bug report at http://bugs.php.net/?id=35650&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=35650&r=trysnapshot44
Try a CVS snapshot (PHP 5.1):
http://bugs.php.net/fix.php?id=35650&r=trysnapshot51
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=35650&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=35650&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=35650&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=35650&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=35650&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=35650&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=35650&r=support
Expected behavior: http://bugs.php.net/fix.php?id=35650&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=35650&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=35650&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=35650&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=35650&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=35650&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=35650&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=35650&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=35650&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=35650&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=35650&r=mysqlcfg
