#35650 [Opn->Fbk]: Extending Exception class causes random failures when multi-threaded

ID: 35650 Updated by: sniper@php.net Reported By: chris at lodesys dot com -Status: Open +Status: Feedback Bug Type: Reproducible crash Operating System: Windows 2000 PHP Version: 5.1.1 New Comment: Please try using this CVS snapshot: http://snaps.php.net/php5.1-latest.tar.gz For Windows: http://snaps.php.net/win32/php5.1-win32-latest.zip Previous Comments: ------------------------------------------------------------------------ [2005-12-12 21:09:31] chris at lodesys dot com 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 this bug report at http://bugs.php.net/?id=35650&edit=1