On 10/14/22 13:07, Richard Shaw wrote:
Interestingly, I did not have any issues, but I'm only running a sshd
jail, which is one of the reasons I wanted wider testing.
I verified that fail2ban was restarted (systemctl status fail2ban) and
then checked the status (fail2ban-client status sshd) and everything was
fine.
I also did a tail -f on both the ssh log and the fail2ban log for a
couple of days and everything seemed fine.
I just checked fail2ban and it was once again pegged at 100% cpu and had
missed several things I look for in the apache logs. systemctl stop
does not work and I have to manually kill the process. FWIW, I ran an
strace on the fail2ban-server process and it produces the following
output that goes on until I stop the strace:
futex(0x7f819854cac8, FUTEX_WAIT_BITSET_PRIVATE, 0, {tv_sec=105267,
tv_nsec=807769996}, FUTEX_BITSET_MATCH_ANY) = -1 ETIMEDOUT (Connection
timed out)
futex(0x7f819854cad0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f819854cac8, FUTEX_WAIT_BITSET_PRIVATE, 0, {tv_sec=105267,
tv_nsec=812963592}, FUTEX_BITSET_MATCH_ANY) = -1 ETIMEDOUT (Connection
timed out)
futex(0x7f819854cad0, FUTEX_WAKE_PRIVATE, 1) = 0
After this I disabled all jails and restarted fail2ban. Then one by one
I enabled them in jail.local. After enabling a jail I did a
fail2ban-client add, then a fail2ban-client start and a fail2ban-cleint
restart. The latter is what allowed it reban past events. Everything
went fine as I reenabled my sshd and all the various apache jails.
Finally, I did my dovecot jail. Bang! As soon as I did the fail2ban
restart on it the fail2ban server process went to 100%. Right now I
assume something is wrong with the dovecot jail.
I then stopped fail2ban. I disabled just the dovecot jail and restarted
fail2ban. It seems to be working as expected. I'll let it run
overnight and check in in the morning. Then I'll see if I can figure it
out. At first glance the latest fail2ban dovecot.conf has a new macro
called _auth_worker_info. There may be more but I'll check that more
thoroughly tomorrow. Maybe just restore the older doveconf.conf from a
backup and see if it works.
Charlie
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