[erlang-questions] "Kernel pid terminated" error getting release to run (newbie)

[Ransom Richardson]

I'm building my first non-trivial Erlang application. I've gotten it working in the shell. Now I'm trying to build a release using rebar. "rebar generate" succeeds, but when I try to run the application I get the error below. I'm trying to follow these tutorials:
http://www.metabrew.com/article/erlang-rebar-tutorial-generating-releases-upgrades
http://alancastro.org/2010/05/01/erlang-application-management-with-rebar.html

I have named both my application and my node "session". The error seems rather unhelpful, so any suggestions on how to debug are appreciated.

thanks,
Ransom



cocomo@REDACTED:~/dev/talko/service/session$ ./rel/session/bin/session console
Exec: /home/cocomo/dev/talko/service/session/rel/session/erts-5.9/bin/erlexec -boot /home/cocomo/dev/talko/service/session/rel/session/releases/1/session -mode embedded -config /home/cocomo/dev/talko/service/session/rel/session/releases/1/sys.config -args_file /home/cocomo/dev/talko/service/session/rel/session/releases/1/vm.args -- console
Root: /home/cocomo/dev/talko/service/session/rel/session
Erlang R15B (erts-5.9) [source] [smp:2:2] [async-threads:0] [hipe] [kernel-poll:false]

1
2

=INFO REPORT==== 6-Feb-2012::18:15:15 ===
    application: session
    exited: {shutdown,{session_app,start,[normal,[]]}}
    type: permanent
Eshell V5.9  (abort with ^G)
(session@REDACTED)1> {"Kernel pid terminated",application_controller,"{application_start_failure,session,{shutdown,{session_app,start,[normal,[]]}}}"}

Crash dump was written to: erl_crash.dump
Kernel pid terminated (application_controller) ({application_start_failure,session,{shutdown,{session_app,start,[normal,[]]}}})


FILE session_app.erl


-module(session_app).

-behaviour(application).

%% Application callbacks
-export([start/0, start/2, stop/1]).

%% ===================================================================
%% Application callbacks
%% ===================================================================

%% start/0 is only to use for testing in the shell
start() ->
    {ok, Pid} = session_sup:start_link(),
    unlink(Pid).

start(_StartType, _StartArgs) ->
    session_sup:start_link().

stop(_State) ->
    ok.



FILE session_sup.erl


-module(session_sup).

-behaviour(supervisor).

%% API
-export([start_link/0]).

%% Supervisor callbacks
-export([init/1]).

%% Helper macro for declaring children of supervisor
-define(CHILD(I, Type), {I, {I, start_link, []}, permanent, 5000, Type, [I]}).

%% ===================================================================
%% API functions
%% ===================================================================

start_link() ->
    supervisor:start_link({local, ?MODULE}, ?MODULE, []).

%% ===================================================================
%% Supervisor callbacks
%% ===================================================================

init([]) ->
    Controller = ?CHILD(controller, worker),
    {ok, { {one_for_one, 5, 10}, [Controller]} }.


FILE reltool.config


{sys, [
       {lib_dirs, ["../../"]},
       {erts, [{mod_cond, derived}, {app_file, strip}]},
       {app_file, strip},
       {rel, "session", "1",
        [
         kernel,
         stdlib,
         sasl,
         session
        ]},
       {rel, "start_clean", "",
        [
         kernel,
         stdlib
        ]},
       {boot_rel, "session"},
       {profile, embedded},
       {incl_cond, exclude},
       {excl_archive_filters, [".*"]}, %% Do not archive built libs
       {excl_sys_filters, ["^bin/.*", "^erts.*/bin/(dialyzer|typer)",
                           "^erts.*/(doc|info|include|lib|man|src)"]},
       {excl_app_filters, ["\.gitignore"]},
       {app, sasl,   [{incl_cond, include}]},
       {app, stdlib, [{incl_cond, include}]},
       {app, kernel, [{incl_cond, include}]},
       {app, session, [{incl_cond, include}]}
      ]}.

{target_dir, "session"}.

{overlay, [
           {mkdir, "log/sasl"},
           {copy, "files/erl", "\{\{erts_vsn\}\}/bin/erl"},
           {copy, "files/nodetool", "\{\{erts_vsn\}\}/bin/nodetool"},
           {copy, "files/session", "bin/session"},
           {copy, "files/sys.config", "releases/\{\{rel_vsn\}\}/sys.config"},
           {copy, "files/session.cmd", "bin/session.cmd"},
           {copy, "files/start_erl.cmd", "bin/start_erl.cmd"},
           {copy, "files/vm.args", "releases/\{\{rel_vsn\}\}/vm.args"}
          ]}.


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