Delete bucket hangs indefinitely if connection(s) in conn_nread state

[{registered_name,'ns_memcached-default'},

  {status,waiting},

  {initial_call,{proc_lib,init_p,5}},

  {backtrace,[<<"Program counter: 0x00007f343a1b45d0 (prim_inet:recv0/3 + 224)">>,

              <<"CP: 0x0000000000000000 (invalid)">>,<<"arity = 0">>,<<>>,

              <<"0x00007f33d503f5e8 Return addr 0x00007f3431929b78 (mc_binary:recv/3 + 280)">>,

              <<"y(0)     41090">>,<<"y(1)     #Port<0.262766>">>,<<>>,

              <<"0x00007f33d503f600 Return addr 0x00007f3431939300 (mc_client_binary:cmd_vocal_recv/5 + 176)">>,

              <<"y(0)     infinity">>,<<"y(1)     res">>,

              <<"y(2)     #Port<0.262766>">>,<<>>,

              <<"0x00007f33d503f620 Return addr 0x00007f343193a4d8 (mc_client_binary:delete_bucket/3 + 416)">>,

              <<"y(0)     []">>,<<"y(1)     []">>,<<"y(2)     infinity">>,

              <<"y(3)     undefined">>,<<"y(4)     undefined">>,

              <<"y(5)     #Port<0.262766>">>,<<"y(6)     134">>,<<>>,

              <<"0x00007f33d503f660 Return addr 0x00007f34316d4a88 (ns_memcached:terminate/2 + 2120)">>,

              <<"y(0)     []">>,<<"y(1)     []">>,<<>>,

              <<"0x00007f33d503f678 Return addr 0x00007f3438db83e0 (gen_server:terminate/6 + 184)">>,

              <<"y(0)     Catch 0x00007f34316d4ac0 (ns_memcached:terminate/2 + 2176)">>,

              <<"y(1)     Catch 0x00007f34316d4c38 (ns_memcached:terminate/2 + 2552)">>,

              <<"y(2)     false">>,<<"y(3)     []">>,<<"y(4)     shutdown">>,

              <<"y(5)     #Port<0.262766>">>,<<"y(6)     \"default\"">>,

              <<"y(7)     true">>,<<>>,

              <<"0x00007f33d503f6c0 Return addr 0x00007f34316cc9c8 (ns_memcached:init/1 + 856)">>,

              <<"y(0)     []">>,

              <<"(1)     {state,0,0,0,{[],[]},{[],[]},{[],[]},warmed,{1464,299229,602145},\"default\",#Port<0.262766>,{interval,#Ref<0.0.38">>,

              <<"y(2)     ns_memcached">>,

              <<"y(3)     {'EXIT',<0.20711.33>,shutdown}">>,

              <<"y(4)     <0.20712.33>">>,<<"y(5)     shutdown">>,

              <<"y(6)     Catch 0x00007f3438db83e0 (gen_server:terminate/6 + 184)">>,

              <<>>,

              <<"0x00007f33d503f700 Return addr 0x00007f3438db2a88 (gen_server:init_it/6 + 376)">>,

              <<"y(0)     []">>,<<"y(1)     []">>,<<"y(2)     []">>,

              <<"y(3)     []">>,<<"y(4)     []">>,<<>>,

              <<"0x00007f33d503f730 Return addr 0x00007f3438c992f0 (proc_lib:init_p_do_apply/3 + 56)">>,

              <<"y(0)     Catch 0x00007f3438db2a88 (gen_server:init_it/6 + 376)">>,

              <<"y(1)     'ns_memcached-default'">>,<<"y(2)     []">>,

              <<"y(3)     ns_memcached">>,

              <<"y(4)     {local,'ns_memcached-default'}">>,