I have made these test:
- new lx-ubuntu 14.04 instance - OK
- new lx-centos6 instance - OK
- my ubuntu running zimbra 8.6 instance - ERROR, after issuing top screen is 
locked


1) zimbra services are running:

root@b87509dd-33f1-cbdb-f444-f4ae30fed80a:~# ps ax
  PID TTY      STAT   TIME COMMAND
18399 /opt/zimbra/log/nginx.log Ss   0:00 nginx: master process 
/opt/zimbra/nginx/sbin/ngi
20490 ?        S      0:00 showq -t unix -u
19072 /opt/zimbra/log/zmswatch.out S   0:00 /usr/bin/perl 
/opt/zimbra/libexec/swatch --con
38654 ?        Rs     0:00 sshd: root@pts/2
20673 ?        S      0:00 proxymap -t unix -u
20998 ?        S      0:00 scache -l -t unix -u
16037 ?        S      0:00 upstart-file-bridge --daemon
16790 ?        Sl     1:44 /opt/zimbra/java/bin/java -client -Xmx256m 
-Dhttps.protocols=TL
18249 ?        Ss     0:00 /opt/zimbra/libexec/zmmailboxdmgr start 
-Dfile.encoding=UTF-8 -
17950 /opt/zimbra/log/mysql_error.log S   0:00 /bin/sh 
/opt/zimbra/mariadb/bin/mysqld_safe
12922 ?        Ss     0:00 dbus-daemon --system --fork
18250 /opt/zimbra/log/zmmailboxd.out Sl   1:32 /opt/zimbra/java/bin/java 
-Dfile.encoding=U
17852 /opt/zimbra/log/zmlogswatch.out S   0:01 /usr/bin/perl 
/opt/zimbra/libexec/zmlogger
    1 ?        S      0:00 /sbin/init
17690 ?        Ss     0:00 /opt/zimbra/unbound/sbin/unbound
15655 ?        Ss     0:00 /usr/sbin/sshd
43624 /opt/zimbra/data/tmp/zmcontrol.error.WoGv3 S   0:00 /bin/bash 
/opt/zimbra/bin/zmdnsc
20166 ?        Ss     0:00 /sbin/getty -8 38400 console
15909 ?        Ss     0:00 cron
20997 ?        S      0:00 smtp -n smtp-amavis -t unix -u -o 
smtp_data_done_timeout=1200 -
18449 ?        Sl     0:00 /usr/bin/perl -T 
/opt/zimbra/amavisd/sbin/amavis-services msg-f
15996 ?        S      0:00 upstart-socket-bridge --daemon
18381 ?        Ssl    0:00 /opt/zimbra/memcached/bin/memcached -d -P 
/opt/zimbra/log/memca
15939 ?        Ssl    0:00 rsyslogd
16557 ?        Ssl    0:01 /opt/zimbra/openldap/sbin/slapd -l LOCAL0 -u zimbra 
-h ldap://z
18401 /opt/zimbra/log/nginx.log S   0:00 nginx: worker process
13036 ?        Ssl    0:00 /lib/inet/ipmgmtd
18558 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (ch1-avail)
18138 /opt/zimbra/log/mysql_error.log Sl   0:03 /opt/zimbra/mariadb/bin/mysqld 
--defaults-
18075 /opt/zimbra/log/zmlogswatch.out S   0:00 zmlogger: zmrrdfetch: server
18400 /opt/zimbra/log/nginx.log S   0:00 nginx: worker process
17851 /opt/zimbra/log/zmlogswatch.out Ss   0:01 /opt/zimbra/libexec/logswatch 
--config-fil
20684 ?        S      0:00 lmtp -t unix -u
18402 /opt/zimbra/log/nginx.log S   0:00 nginx: worker process
18403 /opt/zimbra/log/nginx.log S   0:00 nginx: worker process
18447 ?        S      0:00 /usr/bin/perl -T /opt/zimbra/amavisd/sbin/amavis-mc
19036 ?        Ss     0:03 /opt/zimbra/clamav/bin/freshclam 
--config-file=/opt/zimbra/conf
18452 ?        Sl     0:00 /usr/bin/perl -T 
/opt/zimbra/amavisd/sbin/amavis-services child
18453 ?        Sl     0:00 /usr/bin/perl -T 
/opt/zimbra/amavisd/sbin/amavis-services snmp-
19165 ?        Ss     0:00 /opt/zimbra/cyrus-sasl/sbin/saslauthd -r -a zimbra
18552 ?        Ss     0:02 /opt/zimbra/amavisd/sbin/amavisd (master)
18559 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (ch1-avail)
18560 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (ch1-avail)
18561 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (ch1-avail)
18564 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (ch1-avail)
18567 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (virgin child)
18570 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (virgin child)
18573 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (virgin child)
18576 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (virgin child)
18577 ?        Sl     0:00 /opt/zimbra/amavisd/sbin/amavisd (virgin child)
19042 ?        Sl     0:00 /opt/zimbra/opendkim/sbin/opendkim -x 
/opt/zimbra/conf/opendkim
19102 ?        Sl     0:01 /opt/zimbra/httpd-2.4.10/bin/httpd -k start -f 
/opt/zimbra/conf
19041 ?        Ss     0:00 /opt/zimbra/opendkim/sbin/opendkim -x 
/opt/zimbra/conf/opendkim
18856 ?        Ssl    0:15 /opt/zimbra/clamav/sbin/clamd 
--config-file=/opt/zimbra/conf/cl
20169 /opt/zimbra/log/zmswatch.out S   0:01 /usr/bin/perl 
/opt/zimbra/data/tmp/.swatch_scr
19098 ?        Sl     0:01 /opt/zimbra/httpd-2.4.10/bin/httpd -k start -f 
/opt/zimbra/conf
19430 /opt/zimbra/zmstat/zmstat.out S   0:01 /usr/bin/perl -w 
/opt/zimbra/libexec/zmstat-p
19108 ?        Sl     0:01 /opt/zimbra/httpd-2.4.10/bin/httpd -k start -f 
/opt/zimbra/conf
19091 ?        Ss     0:00 /opt/zimbra/httpd-2.4.10/bin/httpd -k start -f 
/opt/zimbra/conf
19093 ?        S      0:00 /opt/zimbra/httpd/bin/rotatelogs 
/opt/zimbra/log/httpd_error.lo
19094 ?        S      0:00 /opt/zimbra/httpd/bin/rotatelogs 
/opt/zimbra/log/httpd_access.l
19166 ?        S      0:00 /opt/zimbra/cyrus-sasl/sbin/saslauthd -r -a zimbra
19168 ?        S      0:00 /opt/zimbra/cyrus-sasl/sbin/saslauthd -r -a zimbra
19169 ?        S      0:00 /opt/zimbra/cyrus-sasl/sbin/saslauthd -r -a zimbra
19170 ?        S      0:00 /opt/zimbra/cyrus-sasl/sbin/saslauthd -r -a zimbra
19383 ?        Ss     0:00 /opt/zimbra/postfix/libexec/master -w
38669 ?        Ss     0:00 -bash
21005 ?        S      0:00 trivial-rewrite -n rewrite -t unix -u
19385 ?        S      0:00 qmgr -l -t unix -u
19440 /opt/zimbra/zmstat/zmstat.out S   0:00 /usr/bin/perl -w 
/opt/zimbra/libexec/zmstat-i
19384 ?        S      0:00 pickup -l -t unix -u
19438 /opt/zimbra/zmstat/zmstat.out S   0:00 /usr/bin/perl -w 
/opt/zimbra/libexec/zmstat-d
19436 /opt/zimbra/zmstat/zmstat.out S   0:00 /usr/bin/perl -w 
/opt/zimbra/libexec/zmstat-i
19444 /opt/zimbra/zmstat/zmstat.out S   3:21 /usr/bin/perl -w 
/opt/zimbra/libexec/zmstat-a
19447 /opt/zimbra/zmstat/zmstat.out S   0:00 /usr/bin/perl -w 
/opt/zimbra/libexec/zmstat-m
19450 /opt/zimbra/zmstat/zmstat.out S   0:00 /usr/bin/perl -w 
/opt/zimbra/libexec/zmstat-m
19453 /opt/zimbra/zmstat/zmstat.out S   3:32 /usr/bin/perl -w 
/opt/zimbra/libexec/zmstat-n
20478 /opt/zimbra/zmstat/zmstat.out S   0:00 /usr/bin/iostat -d -k 30
21002 ?        S      0:00 smtpd -n [127.0.0.1]:10025 -t inet -u -o 
content_filter= -o loc
20674 ?        S      0:00 trivial-rewrite -n rewrite -t unix -u
21009 ?        S      0:00 smtpd -n [127.0.0.1]:10025 -t inet -u -o 
content_filter= -o loc
21003 ?        S      0:00 smtpd -n [127.0.0.1]:10025 -t inet -u -o 
content_filter= -o loc
20916 ?        S      0:00 smtpd -n [127.0.0.1]:10025 -t inet -u -o 
content_filter= -o loc
19506 /opt/zimbra/zmstat/zmstat.out S   0:01 /usr/bin/perl -w 
/opt/zimbra/libexec/zmstat-l
20991 ?        S      0:00 cleanup -z -t unix -u
20675 ?        S      0:00 smtp -n smtp-amavis -t unix -u -o 
smtp_data_done_timeout=1200 -
43641 ?        R      0:03 ps ax
20676 ?        S      0:00 tlsmgr -l -t unix -u
20476 /opt/zimbra/zmstat/zmstat.out S   0:00 /usr/bin/iostat -d -k -x 30


stop => blank screen, must kill from another console


2) stopping zimbra services => htop is ok !


zimbra@b87509dd-33f1-cbdb-f444-f4ae30fed80a:~$ zmcontrol stop
Host zimbra-1.bring.out.test
        Stopping vmware-ha...skipped.
                /opt/zimbra/bin/zmhactl missing or not executable.
        Stopping zmconfigd...Done.
        Stopping zimlet webapp...Done.
        Stopping zimbraAdmin webapp...Done.
        Stopping zimbra webapp...Done.
        Stopping service webapp...Done.
        Stopping stats...Done.
        Stopping mta...Done.
        Stopping spell...Done.
        Stopping snmp...Done.
        Stopping cbpolicyd...Done.
        Stopping archiving...Done.
        Stopping opendkim...Done.
        Stopping amavis...Done.
        Stopping antivirus...Done.
        Stopping antispam...Done.
        Stopping proxy...Done.
        Stopping memcached...Done.
        Stopping mailbox...Done.
        Stopping logger...Done.
        Stopping dnscache...Done.
        Stopping ldap...Done.


htop is working.


So, one of the above zimbra processes is the cause of the problem.


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