[erlang-questions] Erlang OTP 18 memory leak / SSL

Sereysethy TOUCH <>
Sun Sep 20 18:04:58 CEST 2015


FYI, I use erlang.mk to build my application.

On Sun, Sep 20, 2015 at 10:53 PM, Sereysethy TOUCH <
> wrote:

> Hello,
>
> When do you think a new version erlang 18 will be released which fixes
> this problem?
>
> So you suggest that I should build the maint branch? And what to do with
> erlang installed on my server?
>
> I will stick with shell. No gui.
>
> Sorry I seem confused. Need more helps here :-)
>
>
>
> On Sunday, 20 September 2015, Jesper Louis Andersen <
> > wrote:
>
>> Ingela suggested you try building the "maint" branch, which has a fix for
>> the session cache problem (by Ingela :)
>>
>> simply git pull https://github.com/erlang/otp
>>
>> checkout the maint branch
>>
>> build the result. Alterantively, the 'kerl' application (also on github)
>> can build Erlang. It has an experimental git-mode which may be useful here.
>>
>> I think you are looking at the SSL session cache problem.
>>
>> As for observer: observer:start() will start it:
>>
>> * You need wx in your Erlang installation, it is a GUI application
>> * You need something which can run wx applications. It is somewhat easy
>> in a local dev environment, but the shell commands can be useful in
>> contexts with no easy GUI-line :)
>>
>>
>>
>> On Sun, Sep 20, 2015 at 3:30 PM, Sereysethy TOUCH <
>> > wrote:
>>
>>> Dear Andin,
>>>
>>> To be honest, I am new to Erlang. So I am sorry sometimes for my naive
>>> questions.
>>>
>>> I just tried to fix and debug erlang code written by another person. I
>>> am not sure yet where to look at. Since we dont use anything special about
>>> SSL, beside we ask user browser to present certificate and pass it on to
>>> our agent backend to process it. I look at the code, it seems nothing is
>>> unusual.
>>>
>>> You said this bug exists since Erlang 17? But why there were no memory
>>> leak when it ran on Erlang 17.
>>>
>>> I did as Jesper Louis Andersen suggested, and I saw there a big amount
>>> of memory being used by ssl_manager.
>>>
>>> 32794           client_ssl_otp_session_cache ordered_set 0      89
>>> ssl_manager
>>> 36891           server_ssl_otp_session_cache ordered_set 1564   67995
>>>  ssl_manager
>>> 40993           httpc_manager__session_cookie_db bag   0      299
>>>  httpc_manager
>>>
>>> And it keeps increasing overtime.
>>>
>>> Can you let me know or pointing me to any documents on how to use
>>> observer application?
>>>
>>> Thanks, Sethy
>>>
>>> On Sun, Sep 20, 2015 at 5:07 AM, Ingela Andin <>
>>> wrote:
>>>
>>>> Hi!
>>>>
>>>> 2015-09-19 18:34 GMT+02:00 Sereysethy TOUCH <
>>>> >:
>>>>
>>>>> Hello,
>>>>>
>>>>> I just recently updated Erlang to latest version OTP 18 on Ubuntu
>>>>> server. It uses cowboy (websocket), ranch, ssl, erlydtl & rabbitmq. It used
>>>>> to work fine in OTP 17. The program is correctly compiled but during the
>>>>> execution the memory kept increasing. I need to restart the process every
>>>>> one or two hours to free some memory.
>>>>>
>>>>> I have read a post here [
>>>>> http://erlang.2086793.n4.nabble.com/R18-Unbounded-SSL-Session-ETS-Table-Growth-td4713697.html]
>>>>> which discussed about the ssl_session_cache ETS table which can become very
>>>>> large.
>>>>>
>>>>>
>>>> Well that bug is now fixed for 18.1 and in maint on github. This bug
>>>> however has been around for a while so it is unlikly that this bug causes
>>>> 18 to behave different from 17.
>>>>
>>>>
>>>>
>>>>> The process beam.smp can go up to more than 5G during a few hours of
>>>>> executions.
>>>>>
>>>>> I am not yet sure what is the root cause of this issue.
>>>>>
>>>>> Does anyone know how to fix this? Or where should I look at?
>>>>>
>>>>
>>>>
>>>> You could try using the observer application to inspect the node, makes
>>>> inspecting easy.
>>>> Let us know your findings.
>>>>
>>>> Regards Ingela Erlang/OTP team - Ericsson AB
>>>>
>>>>
>>>>
>>>>>
>>>>> Thanks, Sethy
>>>>>
>>>>> _______________________________________________
>>>>> erlang-questions mailing list
>>>>> 
>>>>> http://erlang.org/mailman/listinfo/erlang-questions
>>>>>
>>>>>
>>>>
>>>
>>> _______________________________________________
>>> erlang-questions mailing list
>>> 
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>>>
>>>
>>
>>
>> --
>> J.
>>
>
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