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

Sereysethy TOUCH <>
Mon Sep 21 09:04:25 CEST 2015


Hello,

I use erlang.mk to build my application. After I successfully built erlang
from maint branch using kerl, when I compiled my application, I got this
error:

My erlang is Erlang/OTP 18 [erts-7.0.3] [source-5991161] [64-bit] [smp:4:4]
[async-threads:10] [hipe] [kernel-poll:false]

Failed to solve release:

 Dependency ssl is specified as a dependency but is not reachable by the
system.


Any ideas?

On Sun, Sep 20, 2015 at 11:18 PM, Loïc Hoguin <> wrote:

> As far as I understand, 18.1 will be released very soon, maybe this week,
> so perhaps your problems will be gone in a few days without having to do
> anything. :-)
>
> On 09/20/2015 06:04 PM, Sereysethy TOUCH wrote:
>
>> FYI, I use erlang.mk <http://erlang.mk> to build my application.
>>
>> On Sun, Sep 20, 2015 at 10:53 PM, Sereysethy TOUCH
>> < <mailto:>> 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
>>     <
>>     <mailto:>> 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
>>
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>>
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>>
>>
>>         --
>>         J.
>>
>>
>>
>>
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>>
> --
> Loïc Hoguin
> http://ninenines.eu
> Author of The Erlanger Playbook,
> A book about software development using Erlang
>
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