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php-developer-list | 2001122

[PHP-DEV] Bug #14780 Updated: Segmentation fault with "mm",PHP works fine with "files" From: jlim <email protected>
Date: 12/31/01

ID: 14780
User updated by: jlim <email protected>
Reported By: jlim <email protected>
Status: Open
Bug Type: Session related
Operating System: RH 7.2
PHP Version: 4.1.1
New Comment:

A simple script that reproduces the problem with "mm". Works fine for a while until "mm" breaks under stress:

<?php
error_reporting(E_ALL);
$abc1 = '';
for ($i=0;$i<20;$i++)
        session_register('abc'.$i);
@$_SESSION['abc1'] += 2;
print "<pre>$abc1\n\n";
?>

Previous Comments:
------------------------------------------------------------------------

[2001-12-31 01:55:44] jlim <email protected>

When stress testing my web server with

ab -n5000 -c10 <url>

after about 1000-1500 requests the child processes start to fail.

In my apache error_log I see many entries like the following:

[Fri Dec 28 19:50:06 2001] [notice] child pid 14215 exit signal Segmentation fault (11)

If I repeat the "ab" test several times, eventually Apache will hang and I have to restart the web server. Here are the results:

This is ApacheBench, Version 1.3
Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright (c) 1998-1999 The Apache Group, http://www.apache.org/

Benchmarking semut (be patient)...
Server Software: Apache/1.3.20
Server Hostname: semut
Server Port: 80

Document Path: /juris/case.php
fbba51299f
Document Length: 85383 bytes

Concurrency Level: 10
Time taken for tests: 1638.945 seconds
Complete requests: 5000
Failed requests: 3446
   (Connect: 0, Length: 3446, Exceptions: 0)
Total transferred: 429091301 bytes
HTML transferred: 427029653 bytes
Requests per second: 3.05
Transfer rate: 261.81 kb/s received

Connnection Times (ms)
              min avg max
Connect: 0 9 197
Processing: 1692 3263 11353
Total: 1692 3272 11550

When I switch from "mm" to "files" everything works fine. I have a suspicion that the bug is related to the fact that I am running on an SMP processor.

------------------------------------------------------------------------

Edit this bug report at http://bugs.php.net/?id=14780&edit=1 

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