sounds like a systemd library issue and our fix for it past 0.9.1:

commit 6dfddbcdf62553d56483d4990e84261845f46508
Author: Serg G. Brester <[email protected]>
Date:   Fri Nov 7 01:21:38 2014 +0100

    Bug fix in formatJournalEntry, gh-851
    
     Unhandled exception in fail2ban 0.9.1 #851



On Sun, 26 Apr 2015, Ivan Demkovitch wrote:

>    Hello list!
>    I'm trying to get fail2ban running on CentOS7 (no SELinux) and it uses
>    firewalld. My goal is to set it to ban Asterisk password fails.
>    Setup was default yum install fail2ban-all
>    Config-wise I ONLY added jail.local with following:
>        [DEFAULT]
>        destemail = [email protected]
>        sender = [email protected]


>        [asterisk]
>        enabled = true

>    Now when I reboot fail2ban service I get fail2ban.log entries like this:
>    2015-04-26 13:52:53,159 fail2ban.server         [2915]: INFO    Changed
>    logging target to /var/log/fail2ban.log for Fail2ban v0.9.1
>    2015-04-26 13:52:53,161 fail2ban.database       [2915]: INFO    Connected
>    to fail2ban persistent database '/var/lib/fail2ban/fail2ban.sqlite3'
>    2015-04-26 13:52:53,169 fail2ban.jail           [2915]: INFO    Creating
>    new jail 'asterisk'
>    2015-04-26 13:52:53,193 fail2ban.jail           [2915]: INFO    Jail
>    'asterisk' uses systemd
>    2015-04-26 13:52:53,225 fail2ban.jail           [2915]: INFO    Initiated
>    'systemd' backend
>    2015-04-26 13:52:53,232 fail2ban.filter         [2915]: INFO    Set
>    maxRetry = 10
>    2015-04-26 13:52:53,234 fail2ban.actions        [2915]: INFO    Set
>    banTime = 600
>    2015-04-26 13:52:53,235 fail2ban.filter         [2915]: INFO    Set
>    findtime = 600
>    2015-04-26 13:52:53,322 fail2ban.filtersystemd  [2915]: NOTICE  Jail
>    started without 'journalmatch' set. Jail regexs will be checked against
>    all journal entries, which is not advised for performance reasons.
>    2015-04-26 13:52:53,409 fail2ban.jail           [2915]: INFO    Jail
>    'asterisk' started
>    2015-04-26 13:52:53,510 fail2ban                [2915]: CRITICAL Unhandled
>    exception in Fail2Ban:
>    Traceback (most recent call last):
>      File "/usr/lib/python2.7/site-packages/fail2ban/server/jailthread.py",
>    line 64, in run_with_except_hook
>        run(*args, **kwargs)
>      File
>    "/usr/lib/python2.7/site-packages/fail2ban/server/filtersystemd.py", line
>    244, in run
>        *self.formatJournalEntry(logentry))
>      File
>    "/usr/lib/python2.7/site-packages/fail2ban/server/filtersystemd.py", line
>    172, in formatJournalEntry
>        'SYSLOG_PID', logentry['_PID']))
>    KeyError: '_PID'
>    I did search online and it seems like it related to a**backenda**. But it
>    does pick backend correctly. What am I missing?

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-- 
Yaroslav O. Halchenko, Ph.D.
http://neuro.debian.net http://www.pymvpa.org http://www.fail2ban.org
Research Scientist,            Psychological and Brain Sciences Dept.
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
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Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
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