disksup crashing when spawned/forked from process

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I've got an Erlang/Elixir application that's being invoked via
child_process in Node.js.  Outside of Node.js, it's fine.  Inside, the node
crashes on startup with a badarg from disksup -- this is because the
application requires that os_mon be started.

A trivial reproducer is the following:

var child_process = require('child_process');
child_process.spawn(path_to_app_executable, ['foreground'],
 { stdio: ignore,
   detached: true });

Included is the crash:

2017-11-23 21:26:04 =ERROR REPORT====
** Generic server disksup terminating
** Last message in was timeout
** When Server state ==
[{data,[{"OS",{unix,linux}},{"Timeout",1800000},{"Threshold",80},{"D
iskData",[]}]}]
** Reason for termination ==
** {badarg,[{erlang,port_close,[#Port<0.2000>],[]},{disksup,terminate,2,[{file,"disksup.erl"
},{line,169}]},{gen_server,try_terminate,3,[{file,"gen_server.erl"},{line,629}]},{gen_server
,terminate,7,[{file,"gen_server.erl"},{line,795}]},{proc_lib,init_p_do_apply,3,[{file,"proc_
lib.erl"},{line,247}]}]}
2017-11-23 21:26:04 =CRASH REPORT====
  crasher:
    initial call: disksup:init/1
    pid: <0.913.0>
    registered_name: disksup
    exception exit:
{{badarg,[{erlang,port_close,[#Port<0.2000>],[]},{disksup,terminate,2,[{
file,"disksup.erl"},{line,169}]},{gen_server,try_terminate,3,[{file,"gen_server.erl"},{line,
629}]},{gen_server,terminate,7,[{file,"gen_server.erl"},{line,795}]},{proc_lib,init_p_do_app
ly,3,[{file,"proc_lib.erl"},{line,247}]}]},[{gen_server,terminate,7,[{file,"gen_server.erl"}
,{line,800}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]}
    ancestors: [os_mon_sup,<0.911.0>]
    messages: []
    links: [<0.912.0>]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 610
    stack_size: 27
    reductions: 368
  neighbours:
2017-11-23 21:26:04 =SUPERVISOR REPORT====
     Supervisor: {local,os_mon_sup}
     Context:    child_terminated
     Reason:
{badarg,[{erlang,port_close,[#Port<0.2000>],[]},{disksup,terminate,2,[{file
,"disksup.erl"},{line,169}]},{gen_server,try_terminate,3,[{file,"gen_server.erl"},{line,629}
]},{gen_server,terminate,7,[{file,"gen_server.erl"},{line,795}]},{proc_lib,init_p_do_apply,3
,[{file,"proc_lib.erl"},{line,247}]}]}
     Offender:
[{pid,<0.913.0>},{id,disksup},{mfargs,{disksup,start_link,[]}},{restart_typ
e,permanent},{shutdown,2000},{child_type,worker}]

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<div dir=3D"ltr">I&#39;ve got an Erlang/Elixir application that&#39;s being=
 invoked via child_process in Node.js.=C2=A0 Outside of Node.js, it&#39;s f=
ine.=C2=A0 Inside, the node crashes on startup with a badarg from disksup -=
- this is because the application requires that os_mon be started.<div><br>=
</div><div>A trivial reproducer is the following:</div><div><br></div><div>=
var child_process =3D require(&#39;child_process&#39;);</div><div>child_pro=
cess.spawn(path_to_app_executable, [&#39;foreground&#39;],=C2=A0</div><div>=
=C2=A0{ stdio: ignore,=C2=A0</div><div>=C2=A0 =C2=A0detached: true });</div=
><div><br></div><div>Included is the crash:</div><div><pre style=3D"word-wr=
ap:break-word;white-space:pre-wrap">2017-11-23 21:26:04 =3DERROR REPORT=3D=
=3D=3D=3D
** Generic server disksup terminating
** Last message in was timeout
** When Server state =3D=3D [{data,[{&quot;OS&quot;,{unix,linux}},{&quot;Ti=
meout&quot;,1800000},{&quot;Threshold&quot;,80},{&quot;D
iskData&quot;,[]}]}]
** Reason for termination =3D=3D
** {badarg,[{erlang,port_close,[#Port&lt;0.2000&gt;],[]},{disksup,terminate=
,2,[{file,&quot;disksup.erl&quot;
},{line,169}]},{gen_server,try_terminate,3,[{file,&quot;gen_server.erl&quot=
;},{line,629}]},{gen_server
,terminate,7,[{file,&quot;gen_server.erl&quot;},{line,795}]},{proc_lib,init=
_p_do_apply,3,[{file,&quot;proc_
lib.erl&quot;},{line,247}]}]}
2017-11-23 21:26:04 =3DCRASH REPORT=3D=3D=3D=3D
  crasher:
    initial call: disksup:init/1
    pid: &lt;0.913.0&gt;
    registered_name: disksup
    exception exit: {{badarg,[{erlang,port_close,[#Port&lt;0.2000&gt;],[]},=
{disksup,terminate,2,[{
file,&quot;disksup.erl&quot;},{line,169}]},{gen_server,try_terminate,3,[{fi=
le,&quot;gen_server.erl&quot;},{line,
629}]},{gen_server,terminate,7,[{file,&quot;gen_server.erl&quot;},{line,795=
}]},{proc_lib,init_p_do_app
ly,3,[{file,&quot;proc_lib.erl&quot;},{line,247}]}]},[{gen_server,terminate=
,7,[{file,&quot;gen_server.erl&quot;}
,{line,800}]},{proc_lib,init_p_do_apply,3,[{file,&quot;proc_lib.erl&quot;},=
{line,247}]}]}
    ancestors: [os_mon_sup,&lt;0.911.0&gt;]
    messages: []
    links: [&lt;0.912.0&gt;]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 610
    stack_size: 27
    reductions: 368
  neighbours:
2017-11-23 21:26:04 =3DSUPERVISOR REPORT=3D=3D=3D=3D
     Supervisor: {local,os_mon_sup}
     Context:    child_terminated
     Reason:     {badarg,[{erlang,port_close,[#Port&lt;0.2000&gt;],[]},{dis=
ksup,terminate,2,[{file
,&quot;disksup.erl&quot;},{line,169}]},{gen_server,try_terminate,3,[{file,&=
quot;gen_server.erl&quot;},{line,629}
]},{gen_server,terminate,7,[{file,&quot;gen_server.erl&quot;},{line,795}]},=
{proc_lib,init_p_do_apply,3
,[{file,&quot;proc_lib.erl&quot;},{line,247}]}]}
     Offender:   [{pid,&lt;0.913.0&gt;},{id,disksup},{mfargs,{disksup,start=
_link,[]}},{restart_typ
e,permanent},{shutdown,2000},{child_type,worker}]</pre></div></div>

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