Re: Erlang SSH client hangs after some thousand requests

Do you call ssh_connection:adjust_window/3?

-Hans

On 12/12/2016 06:01 PM, Mario Santoro wrote:
> Hi all,
> =

> I wrote an Erlang ssh client module for running commands on a remote
> host over an ssh connection.
> =

> The main calls to Erlang ssh library functions to setup the connection
> are the following:
> =

> ssh:connect/4
> =

> ssh_connection:session_channel/2
> =

> ssh_connection:ptty_alloc/3
> =

> ssh_connection:shell/2
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>  =

> =

> afterwards I=92m issuing a command to remote host via:
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> ssh_connection:send/3
> =

>  =

> =

> and receiving related reply in a msg loop, with the following format:
> =

> {ssh_cm, ConnectionRef, {data, ChannelId, Type, Data}}
> =

>  =

> =

> Everything works fine and I=92m able to issue commands and receive
> responses correctly.
> =

>  =

> =

> What I=92m experiencing is a strange behavior on long lasting ssh
> sessions: when I start a long loop of
> =

> ssh send-receive requests, it seems like the client connection hangs
> after a certain number or positive command requests (several thousands),
> =

> waiting indefinitely for a reply, wherefrom it exits with timeout.
> =

> The only way to recover from this status is to disconnect and reconnect
> to the server.
> =

>  =

> =

> I tried with both Erlang OTP/17.x and OTP/18.x and towards remote hosts
> running Linux and/or  Solaris OS, but the result is the same.
> =

>  =

> =

> This behavior seems to be deterministic: given a command, it happens
> after the same number of issued requests (e.g. for a trivial =93pwd=94 co=
mmand,
> =

> the client always hangs after 2510 tries!!).
> =

> This make me think as there=92s a limited receive buffer size somewhere
> into the client ssh library or something similar (maybe something that I
> should set at connection setup?);
> =

> since I=92m quite newbie to Erlang, I=92d very much appreciate if anyone
> could help me to find out the reason for this behaviour.
> =

>  =

> =

> Thanks in advance for your help!
> =

>  =

> =

> Regards,
> =

> /Mario
> =

>  =

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>  =

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>  =

> =

> Ericsson <http://www.ericsson.com/>
> =

> *MARIO SANTORO *
> Service Project Manager
> Region Mediterranean
> RMED ITC CU SCM SL AIB DMO
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