[SR-Users] Memory usage problem in xmpp modules

[Anca Vamanu]

Hi,

Looking roughly in the pua_xmpp module I found some error cases where 
the memory allocated by libxml2 was not freed. I have fixed them now in 
master.
Not sure though if there are related to the memory leak Laura observed. 
Laura, can you check if there were any error messages in the logs 
printed by pua_xmpp module?

Regards,
Anca



On 01/26/2012 03:06 PM, Peter Dunkley wrote:
> Hello,
>
> Some of the memory leaks we found here at Crocodile were to do with 
> the use of libxml2.
>
> Various calls to libxml2 functions resulted in libxml2 malloc'ing 
> memory.  This means you have to call the appropriate xmlFree...() 
> functions in the Kamailio modules to free up this memory.  In some 
> places xmlFree() wasn't called, in other places xmlFree() was called 
> when a different function (for example, xmlFreeDoc()) should have been 
> used.
>
> These memory leaks were not in Kamailio shared or private memory so 
> the statistics from Kamailio didn't show anything unusual.
>
> As xmpp is an XML based protocol I would start by looking at where 
> libxml2 functions which allocate memory are being used and confirm 
> that the correct xmlFree...() functions are called during both normal 
> and abnormal cases.
>
> Regards,
>
> Peter
>
>
> On Thu, 2012-01-26 at 14:53 +0200, Marius Zbihlei wrote:
>> On 01/26/2012 02:34 PM, laura testi wrote:
>> >  Hi Hennings,
>> >  thanks a lot for your answer.
>> >
>> >  I'm sending you other information about our Kamailio xmpp server.
>> >
>> >  in attach the "sercmd cfg.set_now_int core mem_dump_shm" output.
>> >
>> >  And here:
>> >
>> >  kamctl fifo get_statistics | grep mem
>> >
>> >  shmem:fragments = 13107
>> >  shmem:free_size = 99724520
>> >  shmem:max_used_size = 57559216
>> >  shmem:real_used_size = 34493208
>> >  shmem:total_size = 134217728
>> >  shmem:used_size = 25651280
>> >
>> >  Thanks an kind regards,
>> Hello,
>>
>> This seems pretty low (and normal). Probably there are some problems
>> with external libraries (API) using malloc and not properly freeing
>> memory. This is not a problem with the library itself, but more with the
>> way the library is used. For example the libpcre library had this sort
>> of leak when used in the regex modules.
>>
>> Look for external libraries (by checking the dependency list) for the
>> custom setup you have. Then, try to match every external library
>> instantiation(allocation) (via library method) to a corresponding
>> release of resources.
>>
>> Cheers
>> Marius
>>
>
> -- 
> Peter Dunkley
> Technical Director
> Crocodile RCS Ltd
>

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