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

[Christopher Meiklejohn]

Hi Luke,

Sorry for the delay in responding.  Yes, this is a relx/distillery wrapper
around launching beam.smp.

Thanks,
Christopher

On Thu, Nov 23, 2017 at 10:21 PM Luke Bakken <luke@REDACTED> wrote:

> 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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