using gen_tcp new interface inet_backend socket cann't listen multiple sockets in one port

[dogtapdsd]

I try -kernel inet_backend socket options in erlang otp 24, follow the example from acceptor_SUITE:do_ssl_10_acceptors_10_listen_sockets/0, start listen 2 sockets from one port，it fail like this

=ERROR REPORT==== 14-Aug-2021::17:20:17.254374 ===
Failed to start Ranch listener cb_gen_tcp_listener in ranch_tcp:listen(#{connection_type => supervisor,max_connections => infinity,num_acceptors => 40,num_conns_sups => 40,num_listen_sockets => 2,socket_opts => [{cacerts,'...'},{key,'...'},{cert,'...'},{port,8000},{raw,1,15,<<1,0,0,0>>},{nodelay,false},{ip,any},{backlog,2048},{delay_send,false},{send_timeout,5000},{keepalive,true},{exit_on_close,true},{sndbuf,72000},{recbuf,12000}]}) for reason eaddrinuse (address already in use)

=SUPERVISOR REPORT==== 14-Aug-2021::17:20:17.266430 ===
supervisor: {<0.255.0>,ranch_listener_sup}
errorContext: start_error
reason: {listen_error,cb_gen_tcp_listener,eaddrinuse}
offender: [{pid,undefined},
{id,ranch_acceptors_sup},
{mfargs,
{ranch_acceptors_sup,start_link,
[cb_gen_tcp_listener,ranch_tcp,logger]}},
{restart_type,permanent},
{significant,false},
{shutdown,infinity},
{child_type,supervisor}]

=CRASH REPORT==== 14-Aug-2021::17:20:17.266517 ===
crasher:
initial call: supervisor:ranch_acceptors_sup/1
pid: <0.297.0>
registered_name: []
exception exit: {listen_error,cb_gen_tcp_listener,eaddrinuse}
in function ranch_acceptors_sup:listen_error/5 (src/ranch_acceptors_sup.erl, line 95)
in call from ranch_acceptors_sup:'-start_listen_sockets/5-lc$^0/1-0-'/5 (src/ranch_acceptors_sup.erl, line 70)
in call from ranch_acceptors_sup:start_listen_sockets/5 (src/ranch_acceptors_sup.erl, line 71)
in call from ranch_acceptors_sup:init/1 (src/ranch_acceptors_sup.erl, line 34)
in call from supervisor:init/1 (supervisor.erl, line 330)
in call from gen_server:init_it/2 (gen_server.erl, line 423)
in call from gen_server:init_it/6 (gen_server.erl, line 390)
ancestors: [<0.255.0>,ranch_sup,<0.120.0>]
message_queue_len: 0
messages: []
links: [<0.255.0>]
dictionary: []
trap_exit: true
status: running
heap_size: 4185
stack_size: 29
reductions: 8783
neighbours:

inet:i().
Port Module Recv Sent Owner Local Address Foreign Address State Type
16 inet_tcp 0 0 <0.60.0> *:40001 : ACCEPTING STREAM
esock[18] gen_tcp_socket 6 27 <0.58.0> localhost:33328 localhost:epmd CD:SD STREAM
esock[41] gen_tcp_socket 13014 4216 <0.203.0> localhost:58544 localhost:mysql CD:SD STREAM
esock[40] gen_tcp_socket 12831 4219 <0.200.0> localhost:58540 localhost:mysql CD:SD STREAM
esock[39] gen_tcp_socket 12899 4199 <0.197.0> localhost:58538 localhost:mysql CD:SD STREAM
esock[38] gen_tcp_socket 12940 4224 <0.194.0> localhost:58536 localhost:mysql CD:SD STREAM
esock[37] gen_tcp_socket 12831 4276 <0.191.0> localhost:58534 localhost:mysql CD:SD STREAM
esock[36] gen_tcp_socket 12790 4299 <0.188.0> localhost:58532 localhost:mysql CD:SD STREAM
esock[35] gen_tcp_socket 14070 4402 <0.185.0> localhost:58530 localhost:mysql CD:SD STREAM
esock[34] gen_tcp_socket 12882 4238 <0.182.0> localhost:58528 localhost:mysql CD:SD STREAM
esock[33] gen_tcp_socket 12790 4249 <0.179.0> localhost:58526 localhost:mysql CD:SD STREAM
esock[32] gen_tcp_socket 12790 4246 <0.176.0> localhost:58524 localhost:mysql CD:SD STREAM
esock[31] gen_tcp_socket 12790 4278 <0.173.0> localhost:58522 localhost:mysql CD:SD STREAM
esock[30] gen_tcp_socket 12790 4250 <0.170.0> localhost:58520 localhost:mysql CD:SD STREAM
esock[29] gen_tcp_socket 12790 4278 <0.167.0> localhost:58518 localhost:mysql CD:SD STREAM
esock[28] gen_tcp_socket 12790 4244 <0.164.0> localhost:58516 localhost:mysql CD:SD STREAM
esock[27] gen_tcp_socket 12779 4185 <0.161.0> localhost:58514 localhost:mysql CD:SD STREAM
esock[26] gen_tcp_socket 12779 4185 <0.158.0> localhost:58512 localhost:mysql CD:SD STREAM
esock[25] gen_tcp_socket 12779 4185 <0.155.0> localhost:58510 localhost:mysql CD:SD STREAM
esock[24] gen_tcp_socket 12779 4185 <0.152.0> localhost:58508 localhost:mysql CD:SD STREAM
esock[22] gen_tcp_socket 12779 4185 <0.149.0> localhost:58506 localhost:mysql CD:SD STREAM
esock[21] gen_tcp_socket 12779 4185 <0.144.0> localhost:58504 localhost:mysql CD:SD STREAM

if change to old inet interface like “-kernel inet_backend inet”, That will work fine , Is any possible use this features with new socket nif API ?

[essen]

Please try #297

[dogtapdsd]

Thanks， This is confuse me.
https://bugs.erlang.org/browse/ERL-1287
It say Fixed in 23.1 as OTP-16743.
but I when using otp 24 still get this error
eaddrinuse (address already in use)

[dogtapdsd]

ERL-1287 happen again In otp 24. so sad...

Erlang/OTP 24 [erts-12.0.3] [source] [64-bit] [smp:1:1] [ds:1:1:10] [async-threads:1]
Eshell V12.0.3 (abort with ^G)
1>
1> gen_tcp:listen(0, [{inet_backend, socket}, {raw, 1, 15, <<1:32/native>>}, {port, 8888}, {ip, any}]).
{ok,{'$inet',gen_tcp_socket,
{<0.82.0>,
{'$socket',#Ref<0.1220593668.1297743873.200397>}}}}
2>
2> gen_tcp:listen(0, [{inet_backend, socket}, {raw, 1, 15, <<1:32/native>>}, {port, 8888}, {ip, any}]).
{error,eaddrinuse}

Erlang/OTP 23 [erts-11.2] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1] [hipe]
Eshell V11.2 (abort with ^G)
1>
1> gen_tcp:listen(0, [{inet_backend, socket}, {raw, 1, 15, <<1:32/native>>}, {port, 8888}, {ip, any}]).
{ok,{'$inet',gen_tcp_socket,
{<0.83.0>,
{'$socket',#Ref<0.3300202661.3446013953.155967>}}}}
2>
2> gen_tcp:listen(0, [{inet_backend, socket}, {raw, 1, 15, <<1:32/native>>}, {port, 8888}, {ip, any}]).
{ok,{'$inet',gen_tcp_socket,
{<0.85.0>,
{'$socket',#Ref<0.3300202661.3446013953.155982>}}}}

I test in anther vps with otp 23.3 , this bug was fixed. "{inet_backend, socket}" option could listen mutiple sockets

[essen]

Should be fixed in the next OTP-24 release now that erlang/otp#5122 is merged. I will close the ticket. Thanks for the reports!

[Maria-12648430]

I read erlang/otp#5122, and Raimo tagged it for milestone 24.1. So I guess the fix won't be available before that, right?

[essen]

Sounds like it.