It fails to start on install on both, although it fails differently.

The logs (journald) didn't have too much info other than failing, but when I ignore the service and run the binary I get:

x86:
/usr/sbin/rabbitmq-server
ERROR: epmd error for host d: address (cannot connect to host/port)

s390x:
/usr/sbin/rabbitmq-server
2018-12-17 09:17:28.163245 
    args: []
    format: "Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only"
    label: {error_logger,error_msg}
2018-12-17 09:17:28.163616 crash_report        #{label=>{proc_lib,crash},report=>[[{initial_call,{auth,init,['Argument__1']}},{pid,<0.58.0>},{registered_name,[]},{error_info,{error,"Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only",[{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,610},{stack_size,27},{reductions,559}],[]]}
2018-12-17 09:17:28.163996 supervisor_report   #{label=>{supervisor,start_error},report=>[{supervisor,{local,net_sup}},{errorContext,start_error},{reason,{"Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only",[{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}]}]}
2018-12-17 09:17:28.166119 supervisor_report   #{label=>{supervisor,start_error},report=>[{supervisor,{local,kernel_sup}},{errorContext,start_error},{reason,{shutdown,{failed_to_start_child,auth,{"Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only",[{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}]}]}
2018-12-17 09:17:28.168806 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,{"Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only",[{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,184}],[]]}
2018-12-17 09:17:28.171059 std_info            #{label=>{application_controller,exit},report=>[{application,kernel},{exited,{{shutdown,{failed_to_start_child,net_sup,{shutdown,{failed_to_start_child,auth,{"Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only",[{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,{\"Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only\",[{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,{"Cookie file /var/lib/rabbitmq/.erlan

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