gdb -p 12232

(gdb) bt

#0  0x00007f39f71cf283 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6

#1  0x00000000005b1009 in check_fd_events (max_res=512, timeout_time=-9223372036854775808, ps=0x7f39b6ec0060) at sys/common/erl_poll.c:2273

#2  erts_poll_wait_kp (ps=0x7f39b6ec0060, pr=pr@entry=0x7f39f83c0028, len=len@entry=0x7ffc292e8790, timeout_time=timeout_time@entry=-9223372036854775808) at sys/common/erl_poll.c:2460

#3  0x00000000005b3662 in erts_check_io_kp (do_wait=0) at sys/common/erl_check_io.c:1646

#4  0x00000000004d80d9 in scheduler_wait (rq=0x7f39b6ec6300, esdp=0x7f39b6ec6540, fcalls=<synthetic pointer>) at beam/erl_process.c:3263

#5  erts_schedule (esdp=0x7f39b6ec6540, p=<optimized out>, calls=<optimized out>) at beam/erl_process.c:9813

#6  0x000000000043dc2a in process_main () at beam/beam_emu.c:1338

#7  0x0000000000477750 in erl_start (argc=79, argv=<optimized out>) at beam/erl_init.c:2306

#8  0x000000000043a4d9 in main (argc=<optimized out>, argv=<optimized out>) at sys/unix/erl_main.c:30

diff --git a/src/rabbit_reader.erl b/src/rabbit_reader.erl

index b10e8b1..bc7a35a 100644

--- a/src/rabbit_reader.erl

+++ b/src/rabbit_reader.erl

@@ -412,11 +412,14 @@ start_connection(Parent, HelperSup, Deb, Sock) ->

         %% the socket. However, to keep the file_handle_cache

         %% accounting as accurate as possible we ought to close the

         %% socket w/o delay before termination.

-        rabbit_net:fast_close(Sock),

+        R = rabbit_net:fast_close(Sock),

+        rabbit_log:error("CLOSING PORT WITH SOCK ~p", [Sock]),

+        rabbit_log:error("RESULT FROM FAST_CLOSE ~p IN PROCESS PID ~p", [R, self()]),

         rabbit_networking:unregister_connection(self()),

        rabbit_core_metrics:connection_closed(self()),

         rabbit_event:notify(connection_closed, [{pid, self()}])

     end,

+    rabbit_log:error("CLOSING RABBIT READER WITH PID ~p", [self()]),

     done.

 log_connection_exception(Name, Ex) ->

=ERROR REPORT==== 25-May-2017::15:21:27 ===

CLOSING PORT WITH SOCK #Port<0.35375>

RESULT FROM FAST_CLOSE ok IN PROCESS PID <0.1523.0>

CLOSING RABBIT READER WITH PID <0.1523.0>

closing AMQP connection <0.1602.0> (10.0.1.11:44950 -> 10.0.16.34:5672, vhost: '/', user: 'redeliver'):

client unexpectedly closed TCP connection

    Ports = erlang:ports(),

    TcpPortInfos = [erlang:port_info(Port) || Port <- Ports, erlang:port_info(Port, name) =:= {name, "tcp_inet"}],

    lists:map(

      fun (PortInfo) ->

        Pid = proplists:get_value(connected, PortInfo),

        ProcessInfo = erlang:process_info(Pid, [initial_call, current_function, dictionary]),

        [{process_info, ProcessInfo} | PortInfo]

      end, TcpPortInfos

    ).