[Bug 1808984] Re: s390x: erlang.cookie creation fails when changing file permissions

[Dimitri John Ledkov]

create_cookie(Name) ->
    Seed = abs(erlang:monotonic_time()
               bxor erlang:unique_integer()),
    Cookie = random_cookie(20, Seed, []),
    case file:open(Name, [write, raw]) of
        {ok, File} ->
            R1 = file:write(File, Cookie),
            ok = file:close(File),
            R2 = file:raw_write_file_info(Name, make_info(Name)),
            case {R1, R2} of
                {ok, ok} ->
                    ok;
                {{error,Reason}, _} ->
                    {error,
                     lists:flatten(
                       io_lib:format("Failed to write to cookie file '~ts': ~p", [Name, Reason]))};
                {ok, {error, Reason}} ->
                    {error, "Failed to change mode: " ++ atom_to_list(Reason)}
            end;
        {error,Reason} ->
            {error,
             lists:flatten(
               io_lib:format("Failed to create cookie file '~ts': ~p", [Name, Reason]))}
    end.


So, R2 = file:raw_write_file_info(Name, make_info(Name)), is failing.
raw_write_file_info is obsolete, and is a wrapper around write_file_info now.
Digging more.... maybe i could invoke an erlang expert.

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Title:
  s390x: erlang.cookie creation fails when changing file permissions

Status in Ubuntu on IBM z Systems:
  New
Status in elixir-lang package in Ubuntu:
  New
Status in erlang package in Ubuntu:
  New
Status in rabbitmq-server package in Ubuntu:
  New

Bug description:
  Ubuntu: disco development

  On a new deployment, erlang will create a cookie with a random secret
  value for use; however it must have 0400 permissions otherwise erlang
  will refuse to use it.

  On s390x the automatic cookie creation code fails with:

     args: []
      format: "Failed to change mode: einval"
      label: {error_logger,error_msg}
  2018-12-18 13:52:08.629474 crash_report        #{label=>{proc_lib,crash},report=>[[{initial_call,{auth,init,['Argument__1']}},{pid,<0.58.0>},{registered_name,[]},{error_info,{error,"Failed to change mode: einval",[{auth,init_cookie,0,[{file,"auth.erl"},{line,286}]},{auth,init,1,[{file,"auth.erl"},{line,140}]},{gen_server,init_it,2,[{file,"gen_server.erl"},{line,374}]},{gen_server,init_it,6,[{file,"gen_server.erl"},{line,342}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,249}]}]}},{ancestors,[net_sup,kernel_sup,<0.46.0>]},{message_queue_len,0},{messages,[]},{links,[<0.56.0>]},{dictionary,[]},{trap_exit,true},{status,running},{heap_size,987},{stack_size,27},{reductions,1164}],[]]}
  2018-12-18 13:52:08.629867 supervisor_report   #{label=>{supervisor,start_error},report=>[{supervisor,{local,net_sup}},{errorContext,start_error},{reason,{"Failed to change mode: einval",[{auth,init_cookie,0,[{file,"auth.erl"},{line,286}]},{auth,init,1,[{file,"auth.erl"},{line,140}]},{gen_server,init_it,2,[{file,"gen_server.erl"},{line,374}]},{gen_server,init_it,6,[{file,"gen_server.erl"},{line,342}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,249}]}]}},{offender,[{pid,undefined},{id,auth},{mfargs,{auth,start_link,[]}},{restart_type,permanent},{shutdown,2000},{child_type,worker}]}]}
  2018-12-18 13:52:08.634421 supervisor_report   #{label=>{supervisor,start_error},report=>[{supervisor,{local,kernel_sup}},{errorContext,start_error},{reason,{shutdown,{failed_to_start_child,auth,{"Failed to change mode: einval",[{auth,init_cookie,0,[{file,"auth.erl"},{line,286}]},{auth,init,1,[{file,"auth.erl"},{line,140}]},{gen_server,init_it,2,[{file,"gen_server.erl"},{line,374}]},{gen_server,init_it,6,[{file,"gen_server.erl"},{line,342}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,249}]}]}}}},{offender,[{pid,undefined},{id,net_sup},{mfargs,{erl_distribution,start_link,[]}},{restart_type,permanent},{shutdown,infinity},{child_type,supervisor}]}]}
  2018-12-18 13:52:08.636693 crash_report        #{label=>{proc_lib,crash},report=>[[{initial_call,{application_master,init,['Argument__1','Argument__2','Argument__3','Argument__4']}},{pid,<0.45.0>},{registered_name,[]},{error_info,{exit,{{shutdown,{failed_to_start_child,net_sup,{shutdown,{failed_to_start_child,auth,{"Failed to change mode: einval",[{auth,init_cookie,0,[{file,"auth.erl"},{line,286}]},{auth,init,1,[{file,"auth.erl"},{line,140}]},{gen_server,init_it,2,[{file,"gen_server.erl"},{line,374}]},{gen_server,init_it,6,[{file,"gen_server.erl"},{line,342}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,249}]}]}}}}},{kernel,start,[normal,[]]}},[{application_master,init,4,[{file,"application_master.erl"},{line,138}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,249}]}]}},{ancestors,[<0.44.0>]},{message_queue_len,1},{messages,[{'EXIT',<0.46.0>,normal}]},{links,[<0.44.0>,<0.43.0>]},{dictionary,[]},{trap_exit,true},{status,running},{heap_size,987},{stack_size,27},{reductions,225}],[]]}
  2018-12-18 13:52:08.640322 std_info            #{label=>{application_controller,exit},report=>[{application,kernel},{exited,{{shutdown,{failed_to_start_child,net_sup,{shutdown,{failed_to_start_child,auth,{"Failed to change mode: einval",[{auth,init_cookie,0,[{file,"auth.erl"},{line,286}]},{auth,init,1,[{file,"auth.erl"},{line,140}]},{gen_server,init_it,2,[{file,"gen_server.erl"},{line,374}]},{gen_server,init_it,6,[{file,"gen_server.erl"},{line,342}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,249}]}]}}}}},{kernel,start,[normal,[]]}}},{type,permanent}]}
  {"Kernel pid terminated",application_controller,"{application_start_failure,kernel,{{shutdown,{failed_to_start_child,net_sup,{shutdown,{failed_to_start_child,auth,{\"Failed to change mode: einval\",[{auth,init_cookie,0,[{file,\"auth.erl\"},{line,286}]},{auth,init,1,[{file,\"auth.erl\"},{line,140}]},{gen_server,init_it,2,[{file,\"gen_server.erl\"},{line,374}]},{gen_server,init_it,6,[{file,\"gen_server.erl\"},{line,342}]},{proc_lib,init_p_do_apply,3,[{file,\"proc_lib.erl\"},{line,249}]}]}}}}},{kernel,start,[normal,[]]}}}"}
  Kernel pid terminated (application_controller) ({application_start_failure,kernel,{{shutdown,{failed_to_start_child,net_sup,{shutdown,{failed_to_start_child,auth,{"Failed to change mode: einval",[{aut

  Crash dump is being written to:
  /var/log/rabbitmq/erl_crash.dump...done

  Works fine on all other architectures so suspect something endian
  related.

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