Same issue here on opensuse 11.0, daily lockups requiring hard reboot.
Syslog-ng version is syslog-ng-1.6.12-76.1 which seems to be newer than the one in the server:/syslog-ng repo? It's most probably not newer. The build number probably just don't match up, as
https://bugzilla.novell.com/show_bug.cgi?id=414955
User rhafer@novell.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=414955#c17
--- Comment #17 from Ralf Haferkamp