[erlang-questions] disksup crashing when spawned/forked from process

[Luke Bakken]

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" <
christopher.meiklejohn@REDACTED> 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}]


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