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

[Dimitri John Ledkov]

@james-page

Things started to look better I think. I have retried all the things I
have spotted on the report page you pointed at, such that hopefully the
new rabbitmq server will migrate... But I'm about to go EOY, so will not
be able to monitor this further.

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https://bugs.launchpad.net/bugs/1808984

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

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in elixir-lang package in Ubuntu:
  Invalid
Status in erlang package in Ubuntu:
  Fix Released
Status in rabbitmq-server package in Ubuntu:
  Invalid

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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