guam-0.8.3-1.4.el7.kolab_16.x86_64 throws frequently the following error. There can be only one active client at that time, a K-9 Mail on Android with imap IDLE connections.
```
guam: 00:29:03.000 [warning] lager_error_logger_h dropped 17823 messages in the last second that exceeded the limit of 50 messages/sec
```
And sometimes this follows:
```
kernel: Out of memory: Kill process 2492 (beam) score 333 or sacrifice child
```
guam crash.log entry (there are a lot of them):
```
2016-11-15 00:43:13 =ERROR REPORT====
** Generic server <0.18831.84> terminating
** Last message in was {'$gen_cast',accept}
** When Server state == {state,{sslsocket,nil,{#Port<0.1388>,{config,{ssl_options,tls,[{3,3},{3,2},{3,1}],verify_none,{#Fun<ssl.7.104555794>,[]},#Fun<ssl.8.104555794>,false,false,undefined,1,<<"/etc/pki/cyrus-imapd/cyrus-imapd.pem">>,undefined,<<"/etc/pki/cyrus-imapd/cyrus-imapd.pem">>,undefined,[],undefined,<<>>,u
ndefined,undefined,undefined,undefined,undefined,[<<"À,">>,<<"À0">>,<<"À$">>,<<"À(">>,<<"À.">>,<<"À2">>,<<"À&">>,<<"À*">>,<<0,159>>,<<0,163>>,<<0,107>>,<<0,106>>,<<0,157>>,<<0,61>>,<<"À+">>,<<"À/">>,<<"À#">>,<<"À'">>,<<"À-">>,<<"À1">>,<<"À%">>,<<"À)">>,<<0,158>>,<<0,162>>,<<0,103>>,<<0,64>>,<<0,156>>,<<0,60>>,<<"À\
n">>,<<192,20>>,<<0,57>>,<<0,56>>,<<192,5>>,<<192,15>>,<<0,53>>,<<"À\b">>,<<192,18>>,<<0,22>>,<<0,19>>,<<192,3>>,<<"À\r">>,<<0,10>>,<<"À\t">>,<<192,19>>,<<0,51>>,<<0,50>>,<<192,4>>,<<192,14>>,<<0,47>>,<<0,21>>,<<0,9>>],#Fun<ssl.1.104555794>,true,268435456,false,true,undefined,false,undefined,undefined,undefined,und
efined,true,undefined,[],undefined,false,true,undefined,false,{ssl_crl_cache,{internal,[]}},[{sha512,ecdsa},{sha512,rsa},{sha384,ecdsa},{sha384,rsa},{sha256,ecdsa},{sha256,rsa},{sha224,ecdsa},{sha224,rsa},{sha,ecdsa},{sha,rsa},{sha,dsa},{md5,rsa}]},[{reuseaddr,true},{active,false},inet6],<0.106.0>,[inet6,{reuseaddr
,true},{packet_size,0},{packet,0},{header,0},{active,false},{mode,binary}],{gen_tcp,tcp,tcp_closed,tcp_error},tls_connection}}},undefined,<0.94.0>,[{certfile,"/etc/pki/cyrus-imapd/cyrus-imapd.pem"}],true,false,[{host,"127.0.0.1"},{port,9993},{tls,true}],[],[{kolab_guam_rule_filter_groupware,{state,undefined,<<>>,fa
lse,<<>>,[<<"LIST">>,<<"list">>,<<"XLIST">>,<<"xlist">>,<<"LSUB">>,<<"lsub">>]}}],undefined,undefined,undefined}
** Reason for termination ==
** {{badmatch,{error,emfile}},[{kolab_guam_session,post_accept_bookkeeping,4,[{file,"src/kolab_guam_session.erl"},{line,143}]},{kolab_guam_session,accept_client,1,[{file,"src/kolab_guam_session.erl"},{line,127}]},{kolab_guam_session,handle_cast,2,[{file,"src/kolab_guam_session.erl"},{line,51}]},{gen_server,try_disp
atch,4,[{file,"gen_server.erl"},{line,615}]},{gen_server,handle_msg,5,[{file,"gen_server.erl"},{line,681}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,240}]}]}
2016-11-15 00:43:13 =CRASH REPORT====
crasher:
initial call: kolab_guam_session:init/1
pid: <0.18831.84>
registered_name: []
exception exit: {{{badmatch,{error,emfile}},[{kolab_guam_session,post_accept_bookkeeping,4,[{file,"src/kolab_guam_session.erl"},{line,143}]},{kolab_guam_session,accept_client,1,[{file,"src/kolab_guam_session.erl"},{line,127}]},{kolab_guam_session,handle_cast,2,[{file,"src/kolab_guam_session.erl"},{line,51}]},{g
en_server,try_dispatch,4,[{file,"gen_server.erl"},{line,615}]},{gen_server,handle_msg,5,[{file,"gen_server.erl"},{line,681}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,240}]}]},[{gen_server,terminate,7,[{file,"gen_server.erl"},{line,826}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,240}
]}]}
ancestors: [<0.94.0>,kolab_guam_sup,<0.89.0>]
messages: []
links: [<0.94.0>]
dictionary: []
trap_exit: true
status: running
heap_size: 1598
stack_size: 27
reductions: 273
neighbours:
```
guam console.log:
```
2016-11-15 00:43:13.441 [error] <0.18831.84> gen_server <0.18831.84> terminated with reason: no match of right hand value {error,emfile} in kolab_guam_session:post_accept_bookkeeping/4 line 143
2016-11-15 00:43:13.441 [error] <0.18831.84> CRASH REPORT Process <0.18831.84> with 0 neighbours exited with reason: no match of right hand value {error,emfile} in kolab_guam_session:post_accept_bookkeeping/4 line 143 in gen_server:terminate/7 line 826
```
and also:
```
2016-11-15 01:01:45.309 [error] <0.116.0> gen_server <0.116.0> terminated with reason: no match of right hand value {error,closed} in kolab_guam_session:accept_client/1 line 129
```
Thanks in advance! (If the <<"X">> thingy from the crash log contain sensitive info, please remove that part from my report. Thanks!)