A syslog-ng regression update has been released for Debian GNU/Linux 8 Extended LTS to address a regression introduced by the previous update.

ELA-832-2 syslog-ng regression update

Package : syslog-ng
Version : 3.5.6-2+deb8u2 (jessie)

It has been reported that the previous security update, issued as ELA-832-1,
caused a regression leading to the syslog-ng daemon restarting.
This update fixes this regression.

  ELA-832-2 syslog-ng regression update