Re: disksup crashing when spawned/forked from process

--===============7347248791536701965==
Content-Type: multipart/alternative; boundary="001a11402ef229579b055eaddd44"

--001a11402ef229579b055eaddd44
Content-Type: text/plain; charset="UTF-8"

Hi Chris -

What is "path_to_app_executable"? erl itself or a relx-type shell script
sort of thing?

On Nov 23, 2017 1:54 PM, "Christopher Meiklejohn" <
[email protected]> wrote:

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}]


_______________________________________________
erlang-questions mailing list
[email protected]
http://erlang.org/mailman/listinfo/erlang-questions

--001a11402ef229579b055eaddd44
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div>Hi Chris -<div dir=3D"auto"><div dir=3D"auto"><br></=
div><div dir=3D"auto">What is &quot;path_to_app_executable&quot;? erl itsel=
f or a relx-type shell script sort of thing?</div></div><div class=3D"gmail=
_extra"><br><div class=3D"gmail_quote">On Nov 23, 2017 1:54 PM, &quot;Chris=
topher Meiklejohn&quot; &lt;<a href=3D"mailto:christopher.meiklejohn@gmail.=
com">[email protected]</a>&gt; wrote:<br type=3D"attribution=
"><blockquote class=3D"quote" style=3D"margin:0 0 0 .8ex;border-left:1px #c=
cc solid;padding-left:1ex"><div dir=3D"ltr">I&#39;ve got an Erlang/Elixir a=
pplication that&#39;s being invoked via child_process in Node.js.=C2=A0 Out=
side of Node.js, it&#39;s fine.=C2=A0 Inside, the node crashes on startup w=
ith 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_process.spawn(path_to_<wbr>app_executable, [&#39;fo=
reground&#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-wrap:break-word;white-space:pre-wrap">2017-1=
1-23 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;<w=
br>Timeout&quot;,1800000},{&quot;Threshold&quot;<wbr>,80},{&quot;D
iskData&quot;,[]}]}]
** Reason for termination =3D=3D
** {badarg,[{erlang,port_close,[#<wbr>Port&lt;0.2000&gt;],[]},{disksup,<wbr=
>terminate,2,[{file,&quot;disksup.<wbr>erl&quot;
},{line,169}]},{gen_server,<wbr>try_terminate,3,[{file,&quot;gen_<wbr>serve=
r.erl&quot;},{line,629}]},{<wbr>gen_server
,terminate,7,[{file,&quot;gen_<wbr>server.erl&quot;},{line,795}]},{<wbr>pro=
c_lib,init_p_do_apply,3,[{<wbr>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,[<wbr>#Port&lt;0.2000&gt;]=
,[]},{disksup,<wbr>terminate,2,[{
file,&quot;disksup.erl&quot;},{line,169}<wbr>]},{gen_server,try_terminate,<=
wbr>3,[{file,&quot;gen_server.erl&quot;},{<wbr>line,
629}]},{gen_server,terminate,<wbr>7,[{file,&quot;gen_server.erl&quot;},{<wb=
r>line,795}]},{proc_lib,init_p_<wbr>do_app
ly,3,[{file,&quot;proc_lib.erl&quot;},{<wbr>line,247}]}]},[{gen_server,<wbr=
>terminate,7,[{file,&quot;gen_<wbr>server.erl&quot;}
,{line,800}]},{proc_lib,init_<wbr>p_do_apply,3,[{file,&quot;proc_lib.<wbr>e=
rl&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,[#<wbr>Port&lt;0.2000&gt;],[]}=
,{disksup,<wbr>terminate,2,[{file
,&quot;disksup.erl&quot;},{line,169}]},{<wbr>gen_server,try_terminate,3,[{<=
wbr>file,&quot;gen_server.erl&quot;},{line,<wbr>629}
]},{gen_server,terminate,7,[{<wbr>file,&quot;gen_server.erl&quot;},{line,<w=
br>795}]},{proc_lib,init_p_do_<wbr>apply,3
,[{file,&quot;proc_lib.erl&quot;},{line,<wbr>247}]}]}
     Offender:   [{pid,&lt;0.913.0&gt;},{id,disksup},<wbr>{mfargs,{disksup,=
start_link,[]<wbr>}},{restart_typ
e,permanent},{shutdown,2000},{<wbr>child_type,worker}]</pre></div></div>
<br>______________________________<wbr>_________________<br>
erlang-questions mailing list<br>
<a href=3D"mailto:[email protected]">[email protected]<=
/a><br>
<a href=3D"http://erlang.org/mailman/listinfo/erlang-questions" rel=3D"nore=
ferrer" target=3D"_blank">http://erlang.org/mailman/<wbr>listinfo/erlang-qu=
estions</a><br>
<br></blockquote></div><br></div></div></div>

--001a11402ef229579b055eaddd44--

--===============7347248791536701965==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline