[SR-Users] Memory Leak on DB Errors?

[Daniel-Constantin Mierla]

Hello,

seem the leak is in snmpstats, I see lot of allocations like:

ALERT: qm_status:    37599. N  address=0xf30cdf74 frag=0xf30cdf5c 
size=20 used=1
ALERT: qm_status:           alloc'd from snmpstats: 
interprocess_buffer.c: handleContactCallbacks(143)
ALERT: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, 
abcdefed
ALERT: qm_status:    37600. N  address=0xf30cdfb8 frag=0xf30cdfa0 
size=16 used=1
ALERT: qm_status:           alloc'd from snmpstats: utilities.c: 
convertStrToCharString(62)
ALERT: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, 
abcdefed

There are some from usrloc, but very likely they are ok, because they 
are persistent in shm for long time, unless snmpstats asks for some 
clones of the structures from usrloc and forgets to free them (i see one 
allocation is from handleContactCallbacks).

No time to look in the sources, but this is a lead to follow if you want 
to investigate further.

In general, fr a memleak you have to look at allocated chunks that are 
done from same place in the code and there are many of them. The decide 
whether it is something that should be there for long time (like usrloc 
records) or they should be freed quicker comparing with the number of 
allocations.

Pkg log looks very clean, allocations only from startup time (maybe is 
the main process).

Cheers,
Daniel

On 10/6/11 5:31 PM, Klaus Darilion wrote:
> Indeed, DBG_QM_MALLOC is defined. So I have set memlog=1 and dumped 
> mem_info with:
> sercmd cfg.set_now_int core mem_dump_pkg 13286
> sercmd cfg.set_now_int core mem_dump_shm 13286
>
> The dumps were done after ~1h uptime. I can not offload the traffic 
> and wait until transactions are freed, thus the logs are quite huge 
> (~15MByte)
>
> http://pernau.at/kd/memlog.zip
>
> I have no idea for what I should look for - any hints how to analyze 
> the mem_dump?
>
> Thanks
> Klaus
>
>
> On 06.10.2011 13:07, Daniel-Constantin Mierla wrote:
>> Hello,
>>
>> On 10/5/11 11:18 AM, Klaus Darilion wrote:
>>>
>>>
>>> On 04.10.2011 14:03, Daniel-Constantin Mierla wrote:
>>>> Hello,
>>>>
>>>> On 10/4/11 12:27 PM, Klaus Darilion wrote:
>>>>> Meanwhile the server was restarted and the DB problems were fixed. As
>>>>> it is a production server I can not reproduce anymore.
>>>>
>>>> So, once it started it didn't recovered, continued always with that
>>>> error? How much of shm did you configure?
>>>>
>>>> You can try to attach from time to time to one process (can be even 
>>>> the
>>>> main one to avoid blocking a sip worker) and walk through the shm
>>>> allocated chunks, in order to see if there are some unexpected
>>>> repetitions of allocation from same place in sources.
>>>>
>>>> I posted the gdb script for walking through pkg at some point, the
>>>> difference will be to start from the head of shm list (i.e., starting
>>>> with shm_block->first_frag instead of mem_block->first_frag):
>>>>
>>>> http://www.kamailio.org/dokuwiki/doku.php/troubleshooting:memory#walking_through_pkg_with_gdb 
>>>>
>>>>
>>>
>>> Hi Daniel!
>>>
>>> After reading this wiki page I came to the conclusion that for further
>>> debugging I have to recompile Kamailio (using DBG_QM_MALLOC memory
>>> manager instead of F_MALLOC). With the default memory manager it is
>>> not possible to debug the problem. Is it correct?
>> in 3.1 malloc debug was left on (with the goal of catching buffer
>> overflows quickly after several years of development of no using this
>> flag in production), so unless you switched if off, you should get the
>> reports. you can check in the output of kamailio -V
>>
>> Cheers,
>> Daniel
>>

-- 
Daniel-Constantin Mierla -- http://www.asipto.com
Kamailio Advanced Training, Dec 5-8, Berlin: http://asipto.com/u/kat
http://linkedin.com/in/miconda -- http://twitter.com/miconda