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Bug #29724 PHP Encountered an Access Violation
Submitted: 2004-08-18 00:44 UTC Modified: 2004-09-04 01:00 UTC
Votes:14
Avg. Score:4.4 ± 0.9
Reproduced:14 of 14 (100.0%)
Same Version:6 (42.9%)
Same OS:12 (85.7%)
From: bojo at gvea dot com Assigned:
Status: No Feedback Package: Reproducible crash
PHP Version: 5.0.1 OS: Windows 2003 Server
Private report: No CVE-ID: None
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 [2004-08-18 00:44 UTC] bojo at gvea dot com
Description:
------------
The original bug found in PHP 5.0.0, referenced here: http://bugs.php.net/bug.php?id=29127 was never actually resolved.

PHP 5.0.1 continues to give the following error under IIS 6.0 on Windows 2003 Server: PHP has encountered an Access Violation at [random memory address].

Expected result:
----------------
Page processes completely.

Actual result:
--------------
Program bails with the following error: PHP has encountered an Access Violation at [random memory address]

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 [2004-08-18 02:29 UTC] edink@php.net
Not enough information was provided for us to be able
to handle this bug. Please re-read the instructions at
http://bugs.php.net/how-to-report.php

If you can provide more information, feel free to add it
to this bug and change the status back to "Open".

Thank you for your interest in PHP.

 [2004-09-04 01:00 UTC] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 [2005-07-15 14:56 UTC] andrej at seznam dot org
This error is following me on 3 different server configs, from php 4 version on. I encountered this error on combination of:
- Windows server (XP, 2000 server, 2003 server)
- IIS 5.0, 5.1 and 6.0
- PHP from 4 to latest 5.1.0b2
- MySQL from versions 4.0.x to latest 5.0.7 beta3

Finally, I was able to reproduce the bug and eliminate it! But only in one single case:

This PHP code produced Access Violation; It is only weird, that the EXACT THE SAME code worked without problems for months, but then, suddenly, it begins constantly producing Access Violation error:

for($i=0;$i<$rows;$i++) {
  $sqls="UPDATE sms_log SET delivered_date=\"$delivered_date[$i]\", send_date=\"$send_date[$i]\", delivered_status=\"$state[$i]\" WHERE msg_id=\"$msg_id[$i]\" AND to_user RLIKE $to_user[$i]";
  $rs=mysql_query($sqls);
}

Now, I only changed the UPDATE to UPDATE LOW_PRIORITY, and Error was gone! Notise the only difference of UPDATE priorite switch:

for($i=0;$i<$rows;$i++) {
  $sqls="UPDATE LOW_PRIORITY sms_log SET delivered_date=\"$delivered_date[$i]\", send_date=\"$send_date[$i]\", delivered_status=\"$state[$i]\" WHERE msg_id=\"$msg_id[$i]\" AND to_user RLIKE $to_user[$i]";
  $rs=mysql_query($sqls);
}

The only concern I have is that the whole loop of queries took quite a long time to execute, even if they were executed in some other PHP application. I did tests with phpMyAdmin program, and inserted the whole bunch of about 50 queries from the mentioned loop into SQL query textbox. It took around a minute to execute!

BUT
if I executed the SAME bunch of queries from the command prompt, directly to MySQL, it executed in a second!

THEREFORE it is NOT MySQL issue, but is related to how PHP executes MySQL statements. It might me php_mysql.dll library, might be libmysql.dll, or PHP core itself.

Hope this would help with determining the cause of this wide spread and unpredictable error.
 
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