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Posted to dev@httpd.apache.org by Ofer Israeli <of...@checkpoint.com> on 2011/11/09 14:37:44 UTC

Memory Leak when working with AliasMatch and Cache

Hi all,

We have just witnessed a memory leak in the case of Apache 2.2.16 with WinOpenSSL running on Windows when downloading a file that is served from the disk via the AliasMatch directive and does not reside in the cache but is configured as cacheable.
In this case, we see that the child process memory grows by the same size as the size of the file being downloaded and the memory usage does not decline.  After this initial download, the file is cached and when downloading the file again, there is no memory leak.
We have also sent that when Apache is configured not to cache this file and it is served via AliasMatch there is no leak.

Anyone seen this before?


Thanks,
Ofer Israeli
Team Leader, Endpoint Security Management
Check Point Software Technologies<http://www.checkpoint.com/>
* +972-3-753-4715 | M +972-54-749-0320

RE: Memory Leak when working with AliasMatch and Cache

Posted by Ofer Israeli <of...@checkpoint.com>.
Your hypothesis sounds reasonable to me that has to do with memory that should be written to the cache, but the question pertains why this memory is not freed once the file is written to the cache?

Ofer Israeli
Team Leader, Endpoint Security Management
Check Point Software Technologies<http://www.checkpoint.com/>
* +972-3-753-4715 | M +972-54-749-0320

________________________________
From: "Plüm, Rüdiger, VF-Group" [mailto:ruediger.pluem@vodafone.com]
Sent: Wednesday, November 09, 2011 3:57 PM
To: dev@httpd.apache.org
Subject: RE: Memory Leak when working with AliasMatch and Cache

I don't think that this has something to do with AliasMatch. Most likely this is caused by reading the file that should be delivered into some request pool backed
memory in order to write it to the cache. If you don't cache the file it is probably not read by httpd but transported via a sendmail like mechanism (transferfile on Windows?).

Regards

Rüdiger

________________________________
From: Ofer Israeli [mailto:oferi@checkpoint.com]
Sent: Mittwoch, 9. November 2011 14:38
To: dev@httpd.apache.org
Subject: Memory Leak when working with AliasMatch and Cache
Hi all,

We have just witnessed a memory leak in the case of Apache 2.2.16 with WinOpenSSL running on Windows when downloading a file that is served from the disk via the AliasMatch directive and does not reside in the cache but is configured as cacheable.
In this case, we see that the child process memory grows by the same size as the size of the file being downloaded and the memory usage does not decline.  After this initial download, the file is cached and when downloading the file again, there is no memory leak.
We have also sent that when Apache is configured not to cache this file and it is served via AliasMatch there is no leak.

Anyone seen this before?


Thanks,
Ofer Israeli
Team Leader, Endpoint Security Management
Check Point Software Technologies<http://www.checkpoint.com/>
* +972-3-753-4715 | M +972-54-749-0320

RE: Memory Leak when working with AliasMatch and Cache

Posted by "Plüm, Rüdiger, VF-Group" <ru...@vodafone.com>.
I don't think that this has something to do with AliasMatch. Most likely this is caused by reading the file that should be delivered into some request pool backed
memory in order to write it to the cache. If you don't cache the file it is probably not read by httpd but transported via a sendmail like mechanism (transferfile on Windows?).
 
Regards
 
Rüdiger


________________________________

	From: Ofer Israeli [mailto:oferi@checkpoint.com] 
	Sent: Mittwoch, 9. November 2011 14:38
	To: dev@httpd.apache.org
	Subject: Memory Leak when working with AliasMatch and Cache
	
	

	Hi all,

	 

	We have just witnessed a memory leak in the case of Apache 2.2.16 with WinOpenSSL running on Windows when downloading a file that is served from the disk via the AliasMatch directive and does not reside in the cache but is configured as cacheable.

	In this case, we see that the child process memory grows by the same size as the size of the file being downloaded and the memory usage does not decline.  After this initial download, the file is cached and when downloading the file again, there is no memory leak.

	We have also sent that when Apache is configured not to cache this file and it is served via AliasMatch there is no leak.

	 

	Anyone seen this before?

	 

	 

	Thanks,

	Ofer Israeli

	Team Leader, Endpoint Security Management

	Check Point Software Technologies <http://www.checkpoint.com/> 

	* +972-3-753-4715 | M +972-54-749-0320