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Bug #35820 php4ts.dll memory leak
Submitted: 2005-12-27 19:28 UTC Modified: 2006-01-17 20:00 UTC
Votes:4
Avg. Score:5.0 ± 0.0
Reproduced:4 of 4 (100.0%)
Same Version:4 (100.0%)
Same OS:4 (100.0%)
From: ottawaremovethissixtyseven at hotmail dot com Assigned:
Status: Closed Package: IIS related
PHP Version: 5CVS-2006-01-05 (snap) OS: W2K
Private report: No CVE-ID: None
View Developer Edit
 [2005-12-27 19:28 UTC] ottawaremovethissixtyseven at hotmail dot com 
Description:
------------
Latest 4.x snapshot has memory leaks in php4ts.dll.

Here is the output from the debugger:
---------------------------------------------------
php4ts.dll is responsible for 45.47 MBytes worth of outstanding allocations (92% Leak Probability). The following are the top 2 memory consuming functions:

php4ts!XmlParseXmlDecl+9d: 21.43 MBytes worth of outstanding allocations.
php4ts!XmlParseXmlDecl+fb: 13.86 MBytes worth of outstanding allocations.
---------------------------------------------------

We are running performance tests against W2K/IIS5 in ISAPI mode. Very simple PHP scripts which open a connection to Oracle thru ODBC. These performance test run without issue in CGI mode but the CPU performance is unacceptable so we are trying to get ISAPI working.

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 [2006-01-04 22:50 UTC] tony2001@php.net 
Debug symbols:
http://snaps.php.net/win32/php5.1-dbgpack-win32-latest.zip

>There is a significant memory leak in php5ts.dll.
It's great that you keep repeating this and still have not provided any information about the problem.
Does your debugger provide it?

Honestly saying, I don't think this leak even exists, because I can't see any leaks with valgrind on Linux (and I'm sure nobody is able to reproduce it on Windows) and I incline to think that your debugging tool gives you wrong results.
 [2006-01-07 04:46 UTC] ottawaremovethissixtyseven at hotmail dot com 
Load Test:

5 hours. 300 concurrent users loading phpinfo().

DebugDiag results:

php5ts.dll is responsible for 83.81 MBytes worth of outstanding allocations (69% Leak Probability). The following are the top 2 memory consuming functions:

php5ts!_zend_hash_add_or_update+2da: 39.46 MBytes worth of outstanding allocations.

php5ts!_zend_hash_add_or_update+15d: 23.05 MBytes worth of outstanding allocations.
 [2006-01-07 11:45 UTC] tony2001@php.net 
Nice try, but this info is totally useless without a calltrace.
 [2006-01-07 17:06 UTC] ottawaremovethissixtyseven at hotmail dot com 
What exactly is a calltrace? I will try and provide this.
 [2006-01-07 17:11 UTC] sniper@php.net 
It's the thing that contains the function calls that called those functions that leaked. But try provide a reproducing script first. And not one with phpinfo(); which we know leaks.
(it's meant to leak, no bug there)
 [2006-01-08 13:22 UTC] nlopess@php.net 
I assume you are using the new IIS Debug Diagnostics Tool, so if you load the PHP debug symbols correctly you'll receive a more human-understandable report that you can send to us.
I have not tried PHP4, but I don't get any error with PHP 5 (well I don't know which extensions you are using..)
 [2006-01-11 19:18 UTC] ottawaremovethissixtyseven at hotmail dot com 
Yes. We are using IIS Debug Diagnostics Tool. We will send a human readable report shortly.

Can you please tell me where I can find the debug symbols for the PHP 5.1.1 official November 28th release?
 [2006-01-11 22:19 UTC] sniper@php.net 
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

You can find the debug pack here for it: http://snaps.php.net/
 [2006-01-17 17:31 UTC] ottawaremovethissixtyseven at hotmail dot com 
There is a memory leak in php4ts.dll.
The answer is to switch to PHP 5.

There is no memory leak in php5ts.dll (version 5.1).

We thought there was a memory leak in php5ts.dll but found out phpinfo() is meant to leak. It's not a bug. We didn't know this.

As soon as we switched to a different script for testing, we saw no more memory leaks in php5ts.dll

You can close this case and thank you all for your patience and help in this issue.
 
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