So ich muss das Tema ausgraben, denn ich habe genau das selbe Problem.
Wed Aug 10 20:56:06 2016 (26555): Fatal Error Unable to allocate shared memory segment of 67108864 bytes: mmap: No space left on device (28)
[Wed Aug 10 20:56:06 2016] [warn] [client 79.215.xxx.xxx] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Wed Aug 10 20:56:06 2016] [error] [client 79.215.xxx.xxx] Premature end of script headers: index.php
Wed Aug 10 20:56:19 2016 (26557): Fatal Error Unable to allocate shared memory segment of 67108864 bytes: mmap: No space left on device (28)
[Wed Aug 10 20:56:19 2016] [warn] [client 79.215.xxx.xxx] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Wed Aug 10 20:56:19 2016] [error] [client 79.215.xxx.xxx] Premature end of script headers: index.php
Genau die selbe Fehlermeldung und benutze auch die selbe Distribution nur läuft das ganze auf einem Virtualserver der hat aber 4 GB Ram.
Und bei mir sind alle pakete installiert.
Wie kann man dies beheben, denn langes Googlen hat mir leider nix geholfen und brachte mich auch zufällig auf diesen Thread hier. Habe auch die Tips die hier gepostet wurden angewendet, aber brachte leider kein Erfolg.
Nach einer weile kommt dann "Internal Server Error" 
Installiert ist 
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PHP 5.6.24-1~dotdeb+7.1 (cgi-fcgi) (built: Jul 21 2016 23:05:14)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
Muss auch dazu sagen mit phpversion 5.4.x gibt es absolut keine Probleme und läuft alles top.
free -m
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                                        total       used       free     shared    buffers     cached
                   Mem:          4096       1831       2264          0          0          0
 
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root@lvps83-169-41-231:/etc/php5/cgi# ps auxf
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.0  10616   856 ?        Ss   Aug09   0:01 init [2]
root      3270  0.0  0.0  58820  1796 ?        Sl   Aug09   0:00 /usr/sbin/rsyslogd -c5
root      3295  0.0  0.0  58484  1008 ?        Ss   Aug09   0:00 /usr/sbin/saslauthd -a pam -c -m /var/run/saslauthd -n 2
root      3296  0.0  0.0  58484   640 ?        S    Aug09   0:00  \_ /usr/sbin/saslauthd -a pam -c -m /var/run/saslauthd -n 2
bind      3329  0.0  0.2 110128 12488 ?        Ssl  Aug09   0:00 /usr/sbin/named -u bind
clamav    3713  0.0  9.0 494556 380608 ?       Ssl  Aug09   0:55 /usr/sbin/clamd -c /etc/clamav/clamd.conf --pid=/run/clamav/clamd.pid
clamav    3816  0.0  0.1  76016  4940 ?        Ss   Aug09   0:31 /usr/bin/freshclam -d --quiet --config-file=/etc/clamav/freshclam.conf --pid=/run/clamav/freshclam.pid
root      3838  0.0  0.0  18848  1000 ?        Ss   Aug09   0:00 /usr/sbin/cron
116       3848  0.0  0.0  29772   976 ?        Ss   Aug09   0:00 /usr/bin/dbus-daemon --system
root      3861  0.0  0.2 195112  9596 ?        Sl   Aug09   0:43 /usr/bin/python /usr/bin/fail2ban-server -b -s /var/run/fail2ban/fail2ban.sock
root      3863  0.0  0.0  22264  1640 ?        S    Aug09   0:00 /usr/lib/gamin/gam_server
root      3912  0.0  0.0   4144   708 ?        S    Aug09   0:00 /bin/sh /usr/bin/mysqld_safe
mysql     5298  0.0  2.3 416756 98852 ?        Sl   Aug09   0:07  \_ /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/
root      5300  0.0  0.0   4052   668 ?        S    Aug09   0:00  \_ logger -t mysqld -p daemon.error
root      5431  0.0  0.0  21484   968 ?        Ss   Aug09   0:00 /usr/sbin/dovecot -c /etc/dovecot/dovecot.conf
dovecot   5442  0.0  0.0  13012  1120 ?        S    Aug09   0:00  \_ dovecot/anvil
root      5443  0.0  0.0  13140  1316 ?        S    Aug09   0:00  \_ dovecot/log
root     26295  0.0  0.0  27160  2880 ?        S    20:29   0:00  \_ dovecot/config
dovenull 26422  0.0  0.0  24228  3240 ?        S    20:41   0:00  \_ dovecot/imap-login
dovenull 26423  0.0  0.0  24228  3244 ?        S    20:41   0:00  \_ dovecot/imap-login
dovenull 26424  0.0  0.0  24228  3244 ?        S    20:41   0:00  \_ dovecot/imap-login
vmail    26427  0.0  0.0  25212  2992 ?        S    20:41   0:00  \_ dovecot/imap
vmail    26429  0.0  0.0  25476  3140 ?        S    20:41   0:00  \_ dovecot/imap
vmail    26431  0.0  0.0  25228  2952 ?        S    20:41   0:00  \_ dovecot/imap
dovenull 26432  0.0  0.0  24228  3240 ?        S    20:42   0:00  \_ dovecot/imap-login
vmail    26433  0.0  0.0  25200  2840 ?        S    20:42   0:00  \_ dovecot/imap
root      5671  0.0  0.0  37840  2512 ?        Ss   Aug09   0:00 /usr/lib/postfix/master
postfix   5685  0.0  0.0  40076  2640 ?        S    Aug09   0:00  \_ qmgr -l -t fifo -u
postfix   7508  0.0  0.0  42428  3484 ?        S    Aug09   0:00  \_ tlsmgr -l -t unix -u -c
postfix  24252  0.0  0.0  39908  2388 ?        S    19:27   0:00  \_ pickup -l -t fifo -u -c -o content_filter= -o receive_override_options=no_header_body_checks
root      5687  0.0  0.0  49908  1248 ?        Ss   Aug09   0:00 /usr/sbin/sshd
root     26188  0.0  0.0  54540  3320 ?        Ss   20:20   0:00  \_ sshd: micha [priv]
micha    26190  0.0  0.0  54700  1572 ?        R    20:20   0:00      \_ sshd: micha@pts/0
micha    26191  0.0  0.0  17888  2040 pts/0    Ss   20:20   0:00          \_ -bash
root     26194  0.0  0.0  46308  1728 pts/0    S    20:20   0:00              \_ su root
root     26195  0.0  0.0  17892  2048 pts/0    S    20:20   0:00                  \_ bash
root     26460  0.0  0.0  15268  1152 pts/0    R+   20:52   0:00                      \_ ps auxf
root      5708  0.0  0.0  19528   980 ?        Ss   Aug09   0:00 /usr/sbin/xinetd -pidfile /var/run/xinetd.pid -stayalive -inetd_compat -inetd_ipv6
root      7611  0.0  1.3 141560 58160 ?        Ss   Aug09   0:01 /usr/sbin/spamd --create-prefs --max-children 5 --helper-home-dir -d --pidfile=/var/run/spamd.pid
root      7640  0.0  1.3 141560 55596 ?        S    Aug09   0:00  \_ spamd child
root      7641  0.0  1.3 141560 55596 ?        S    Aug09   0:00  \_ spamd child
amavis    7633  0.0  2.2 213388 94156 ?        Ss   Aug09   0:01 /usr/sbin/amavisd-new (master)
amavis    7643  0.0  2.2 215540 94868 ?        S    Aug09   0:00  \_ /usr/sbin/amavisd-new (ch2-avail)
amavis    7644  0.0  2.2 215196 94624 ?        S    Aug09   0:00  \_ /usr/sbin/amavisd-new (ch1-avail)
root     24415  0.0  0.5 303220 24220 ?        Ss   19:40   0:00 /usr/sbin/apache2 -k start
www-data 26353  0.0  0.2 157544  8912 ?        S    20:34   0:00  \_ /usr/sbin/apache2 -k start
micha    26356  0.0  0.6 237440 27784 ?        S    20:34   0:00  |   \_ /usr/bin/php5-cgi
micha    26364  0.0  0.6 238468 27176 ?        S    20:34   0:00  |   \_ /usr/bin/php5-cgi
micha    26435  0.0  0.5 243688 22556 ?        S    20:44   0:00  |   \_ /usr/bin/php5-cgi
micha    26438  0.0  0.4 241248 19952 ?        S    20:44   0:00  |   \_ /usr/bin/php5-cgi
micha    26439  0.0  0.4 242264 20872 ?        S    20:44   0:00  |   \_ /usr/bin/php5-cgi
www-data 26355  0.0  0.2 304036 11824 ?        S    20:34   0:00  \_ /usr/sbin/apache2 -k start
www-data 26360  0.0  0.2 304108 11780 ?        S    20:34   0:00  \_ /usr/sbin/apache2 -k start
www-data 26361  0.0  0.2 304072 11796 ?        S    20:34   0:00  \_ /usr/sbin/apache2 -k start
www-data 26362  0.0  0.2 303916 11768 ?        S    20:34   0:00  \_ /usr/sbin/apache2 -k start
www-data 26363  0.0  0.2 303676 11440 ?        S    20:34   0:00  \_ /usr/sbin/apache2 -k start
Kann mir da jemand helfen??