[OpenSIPS-Users] Chasing down unreleased memory

Răzvan Crainea razvan at opensips.org
Tue Oct 2 04:41:59 EDT 2018 

Hi, Jock!

Good news :) I've just figured out the pkg memleak in mc_compact, and 
I've already pushed a fix upstream. Please pull the latest version and 
run a few tests, and let us know how they go.
In the meantime, I will investigate the shm leak.

Best regards,
Razvan

On 10/2/18 10:13 AM, Răzvan Crainea wrote:
> Hi, Jock!
> 
> I am pretty busy these days, so I couldn't pay too much attention to 
> this thread. Nevertheless, I will try to prioritize it this week and get 
> back to you.
> I have also tracked down the pkg mem leak to the mc_compact() module, 
> but I can't pinpoint for now exactly the issue. Although I have some 
> assumptions, I can't be sure until I run some tests.
> If I need extra info during my debug, I will definitely let you know, so 
> keep an eye on this thread.
> 
> Best regards,
> Răzvan
> 
> On 10/1/18 9:14 PM, Jock McKechnie wrote:
>> Greetings;
>>
>> I should have done this last week but, to be honest, it just didn't
>> occur to me. I pulled the compression module out (and commented out
>> mc_compact()) and re-ran my tests and the memory usage was massively
>> lower (losing 100k of memory per minute vs 3-5MB/minute) and within a
>> few minutes of calling ceasing almost all of the memory was released
>> (went from 42MB down to 3.8MB within 6 minutes).
>>
>> So it appears that there's something leaking in the compression module.
>>
>> I'm going to poke around a few more tests (include compression.so
>> without actually calling it, etc) but I wanted to pass this on as
>> there appears to be a bug that needs addressing.
>>
>> Is there anything I can provide that might be useful in debugging this?
>>
>> As always, thank you for your help.
>>
>>   - Jock
>>
>> On Fri, Sep 21, 2018 at 8:12 AM, Jock McKechnie
>> <jock.mckechnie at gmail.com> wrote:
>>> Thank you very much, Răzvan;
>>>
>>> We are using the compression module for mc_compact(). We use SIP
>>> headers for passing around data (don't ask) and the compact headers
>>> are mandatory or else we hit MTU/fragmentation problems. We're on the
>>> cusp of moving to SIP/TCP but haven't gotten there quite yet.
>>> The mc_compact() lives in the main route[1] block and is simply this, 
>>> in whole:
>>>      mc_compact("P-Asserted-Identity|Remote-Party-ID|X-UCID");
>>>
>>> And my apologies for not including the shm dump segment - please find 
>>> it below.
>>> https://pastebin.com/itSTER7Y
>>>
>>> Let me know what else I can provide, this is fairly easy to replicate
>>> (although it takes about an hour of runtime pummeling it to get nice
>>> easy to read dumps). Thank you, again, very much.
>>>
>>>   - Jock
>>>
>>> On Fri, Sep 21, 2018 at 3:01 AM, Răzvan Crainea <razvan at opensips.org> 
>>> wrote:
>>>> Hi, Jock!
>>>>
>>>> I think you are actually heating two memory leaks: one in private 
>>>> memory and
>>>> one in shared memory.
>>>> In the memory dump you sent I can spot a pkg mem related to (I 
>>>> believe) the
>>>> compression module. Can you tell me what functions of the 
>>>> compression module
>>>> you are using and what flags are you using for them?
>>>>
>>>> Besides that, you claim there is a shared memory leak as well. Can 
>>>> you send
>>>> us the logs for the shared memory? They are dumped by the first process
>>>> (attendant) and should start with the string "Memory status (shm):". 
>>>> Can you
>>>> post those logs as well?
>>>>
>>>> Best regards,
>>>> Razvan
>>>>
>>>>
>>>> On 9/20/18 9:43 PM, Jock McKechnie wrote:
>>>>>
>>>>> Greetings OpenSIPS gurus;
>>>>>
>>>>> I've run into an issue that I'm not making any real headway with on my
>>>>> own. I have an OpenSIPS 2.4.2 running on CentOS7 that does not appear
>>>>> to be releasing the bulk of its shared memory when calls die off.
>>>>> Eventually OpenSIPS runs itself out of shared memory and goes beserk
>>>>> when it can't reclaim memory for new transactions, or I've also seen
>>>>> the kernel oomkiller take it down.
>>>>>
>>>>> The setup is, as mentioned, a 2.4.2 which has a chunk of perl living
>>>>> on its back that handles some API directed call decisions. Because of
>>>>> the inevitable delay in the API lookups I am running a large number of
>>>>> threads (100) to ensure that I don't start dropping packets under high
>>>>> levels of load (50 CPS+ - until I bumped children counts up I was
>>>>> seeing packets being ignored which got the End User very excitable). I
>>>>> appreciate having lots of children amplifies memory usage but my
>>>>> belief is during regular load on our side (~6000 calls at ~30 - 40CPS)
>>>>> I should have a full day's runtime easily w/o running into problems.
>>>>> The issue is that because the memory is not released overnight it
>>>>> starts the next day with half its shared memory gone, and then things
>>>>> go to pot the next day when it runs through all its remaining shared
>>>>> memory.
>>>>>
>>>>> I have it configured for a very large (I think) amount of memory to
>>>>> attempt to compensate short-term - 2048MB shared memory, 128MB package
>>>>> memory. This is not a well thought-out number, just me throwing RAM at
>>>>> the problem. (For reference this is on a VM running with 4 cores and
>>>>> 4096MB of RAM)
>>>>>
>>>>> I have graphed the memory stats out of the FIFO, after enabling
>>>>> memstats and DBG_MALLOC/etc. The graphs can be found here:
>>>>> https://imgur.com/a/oapKYJW
>>>>>
>>>>> You'll see that the first graph, the main shmem:, shows the usage gets
>>>>> tied up and remains after calls die off (these examples run for 20
>>>>> minutes after the calls stopped - but I can leave it overnight and the
>>>>> shmem: usage won't drop). This being said, the other graphed modules
>>>>> show that it releases memory correctly after calls quit like they
>>>>> should. None of the other modules graphed (eg, _all_ of the modules I
>>>>> was using in OpenSIPS) showed no significant usage and I've omitted
>>>>> them.
>>>>>
>>>>> Interesting that the 'perl' module shows no stats ever which makes me
>>>>> wonder if the stats on this module works. I am not storing anything
>>>>> inside perl, besides lots of local session variables, and all channel
>>>>> variables are pushed back into OpenSIPS AVPs, but I assume there must
>>>>> be some memory overhead, although it may not significantly change.
>>>>>
>>>>> When I shut OpenSIPS down I get child dumps like the following: (I've
>>>>> included only one for brevity, but they're all much of a muchness)
>>>>> https://pastebin.com/KG2qxxBa
>>>>>
>>>>> If I'm reading this right (and there's a strong possibility I'm
>>>>> misunderstanding what I'm looking at) the memory is tied up in io_wait
>>>>> and the parser. I'm not sure what this signifies, however.
>>>>>
>>>>> So I guess what I'm asking is:
>>>>> Am I understanding what I'm looking at correctly and that OpenSIPS is
>>>>> not releasing its shared memory which causes it to run out of memory
>>>>> quicker the following day? (Which lines up with the symptoms of
>>>>> shorter runtimes before failure)
>>>>>
>>>>> Based on the dumps where should I look for the source of this issue?
>>>>>
>>>>> Finally, and unrelated to the above, I attempted to mail the official
>>>>> OpenSIPS peeps to talk about paid support but none of the 'contact us'
>>>>> submits appear to work - when I click on the submit button it changes
>>>>> shade but does not appear to act. Certainly I never received any
>>>>> response. If there was a direct eMail address I could send to that
>>>>> would be preferable.
>>>>>
>>>>> As always, my thanks for your time.
>>>>>
>>>>>    - Jock
>>>>>
>>>>> PS -
>>>>> List of modules I'm using in this config:loadmodule "signaling.so"
>>>>> loadmodule "sl.so"
>>>>> loadmodule "tm.so"
>>>>> loadmodule "rr.so"
>>>>> loadmodule "maxfwd.so"
>>>>> loadmodule "textops.so"
>>>>> loadmodule "uri.so"
>>>>> loadmodule "mi_fifo.so"
>>>>> loadmodule "siptrace.so"
>>>>> loadmodule "sipmsgops.so"
>>>>> loadmodule "dialog.so"
>>>>> loadmodule "uac_auth.so"
>>>>> loadmodule "uac.so"
>>>>> loadmodule "perl.so"
>>>>> loadmodule "acc.so"
>>>>> loadmodule "proto_hep.so"
>>>>> loadmodule "proto_udp.so"
>>>>> loadmodule "compression.so"
>>>>>
>>>>> _______________________________________________
>>>>> Users mailing list
>>>>> Users at lists.opensips.org
>>>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>>>>
>>>>
>>>> -- 
>>>> Răzvan Crainea
>>>> OpenSIPS Core Developer
>>>>    http://www.opensips-solutions.com
>>>>
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> 

-- 
Răzvan Crainea
OpenSIPS Core Developer
   http://www.opensips-solutions.com

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