The SIGTERM is normal, it's lightdm + greeter terminating so session can start
Code:
Jan 10 17:40:41 localhost audit[970]: USER_AUTH pid=970 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:authentication grantors=pam_unix,pam_gnome_keyring acct="leigh" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 10 17:40:41 localhost audit[970]: USER_ACCT pid=970 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:accounting grantors=pam_unix,pam_localuser acct="leigh" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 10 17:40:41 localhost systemd[1]: session-c1.scope: Killing process 849 (lightdm) with signal SIGTERM.
Jan 10 17:40:41 localhost systemd[1]: session-c1.scope: Killing process 863 (slick-greeter) with signal SIGTERM.
Jan 10 17:40:41 localhost systemd[1]: Stopping Session c1 of user lightdm.
Jan 10 17:40:41 localhost lightdm[849]: pam_unix(lightdm-greeter:session): session closed for user lightdm
Jan 10 17:40:41 localhost audit[849]: USER_END pid=849 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:session_close grantors=pam_unix,pam_systemd acct="lightdm" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 10 17:40:41 localhost audit[849]: CRED_DISP pid=849 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:setcred grantors=pam_env,pam_permit acct="lightdm" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 10 17:40:41 localhost systemd[1]: Stopped Session c1 of user lightdm.
Jan 10 17:40:41 localhost lightdm[714]: Could not chown user data directory /var/lib/lightdm-data/leigh: Error creating directory /var/lib/lightdm-data/leigh: File exists
Jan 10 17:40:41 localhost systemd-logind[593]: Removed session c1.
Jan 10 17:40:41 localhost audit[970]: CRED_ACQ pid=970 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:setcred grantors=pam_unix,pam_gnome_keyring acct="leigh" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 10 17:40:41 localhost systemd[1]: Stopping User Manager for UID 993...
Jan 10 17:40:41 localhost systemd[857]: Stopping Virtual filesystem service...
Jan 10 17:40:41 localhost systemd[857]: Stopping Accessibility services bus...
Jan 10 17:40:41 localhost systemd[857]: Stopped target Default.
Jan 10 17:40:41 localhost systemd[857]: Stopping D-Bus User Message Bus...
Jan 10 17:40:41 localhost systemd[857]: Stopped D-Bus User Message Bus.
Jan 10 17:40:41 localhost systemd[857]: Stopped Accessibility services bus.
Jan 10 17:40:41 localhost systemd[857]: Stopped Virtual filesystem service.
Jan 10 17:40:41 localhost systemd[857]: Stopped target Basic System.
Jan 10 17:40:41 localhost systemd[857]: Stopped target Timers.
Jan 10 17:40:41 localhost systemd[857]: Stopped target Paths.
Jan 10 17:40:41 localhost systemd[857]: Stopped target Sockets.
Jan 10 17:40:41 localhost systemd[857]: Closed D-Bus User Message Bus Socket.
Jan 10 17:40:41 localhost systemd[857]: Reached target Shutdown.
Jan 10 17:40:41 localhost systemd[857]: Starting Exit the Session...
Jan 10 17:40:41 localhost systemd[857]: Received SIGRTMIN+24 from PID 1052 (kill).
Jan 10 17:40:41 localhost systemd[1]: Stopped User Manager for UID 993.
Jan 10 17:40:41 localhost audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=user@993 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 10 17:40:41 localhost systemd-logind[593]: New session 2 of user leigh.
Jan 10 17:40:41 localhost systemd[1]: Removed slice User Slice of lightdm.
Jan 10 17:40:41 localhost systemd[1]: Created slice User Slice of leigh.
Jan 10 17:40:41 localhost systemd[1]: Starting User Manager for UID 1000...
Jan 10 17:40:41 localhost systemd[1]: Started Session 2 of user leigh.
Jan 10 17:40:41 localhost audit[1053]: USER_ACCT pid=1053 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:accounting grantors=pam_unix,pam_localuser acct="leigh" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 10 17:40:41 localhost systemd[1053]: pam_unix(systemd-user:session): session opened for user leigh by (uid=0)
Jan 10 17:40:41 localhost audit[1053]: USER_START pid=1053 uid=0 auid=1000 ses=3 msg='op=PAM:session_open grantors=pam_selinux,pam_selinux,pam_loginuid,pam_keyinit,pam_limits,pam_systemd,pam_unix acct="leigh" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 10 17:40:41 localhost systemd[1053]: Reached target Timers.
Jan 10 17:40:41 localhost audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=user@1000 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 10 17:40:41 localhost audit[970]: USER_START pid=970 uid=0 auid=1000 ses=2 msg='op=PAM:session_open grantors=pam_selinux,pam_loginuid,pam_selinux,pam_keyinit,pam_namespace,pam_gnome_keyring,pam_keyinit,pam_limits,pam_systemd,pam_unix,pam_lastlog,pam_lastlog acct="leigh" exe="/usr/sbin/lightdm" hostname=? addr=? terminal=:0 res=success'
Jan 10 17:40:41 localhost audit[970]: USER_LOGIN pid=970 uid=0 auid=1000 ses=2 msg='op=login id=1000 exe="/usr/sbin/lightdm" hostname=localhost addr=? terminal=/dev/tty1 res=success'
Jan 10 17:40:41 localhost systemd[1053]: Reached target Paths.
Jan 10 17:40:41 localhost lightdm[970]: pam_unix(lightdm:session): session opened for user leigh by (uid=0)
Jan 10 17:40:41 localhost systemd[1053]: Starting D-Bus User Message Bus Socket.
Jan 10 17:40:41 localhost dbus-daemon[600]: [system] Activating via systemd: service name='org.freedesktop.GeoClue2' unit='geoclue.service' requested by ':1.29' (uid=1000 pid=1059 comm="/usr/bin/redshift ")
Jan 10 17:40:41 localhost redshift[1059]: Trying location provider `geoclue2'...
Jan 10 17:40:41 localhost redshift[1059]: Using provider `geoclue2'.
Jan 10 17:40:41 localhost systemd[1053]: Listening on D-Bus User Message Bus Socket.
Jan 10 17:40:41 localhost systemd[1053]: Reached target Sockets.
Jan 10 17:40:41 localhost systemd[1053]: Reached target Basic System.
Jan 10 17:40:41 localhost systemd[1]: Started User Manager for UID 1000.
Jan 10 17:40:41 localhost systemd[1053]: Started Redshift display colour temperature adjustment.
Jan 10 17:40:41 localhost systemd[1053]: Reached target Default.
Jan 10 17:40:41 localhost systemd[1053]: Startup finished in 35ms.
Jan 10 17:40:41 localhost systemd[1]: Starting Location Lookup Service...
Jan 10 17:40:41 localhost dbus-daemon[600]: [system] Successfully activated service 'org.freedesktop.GeoClue2'
Jan 10 17:40:41 localhost audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=geoclue comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 10 17:40:41 localhost systemd[1]: Started Location Lookup Service.
Jan 10 17:40:42 localhost systemd[1053]: Started D-Bus User Message Bus.
Jan 10 17:40:42 localhost dbus-daemon[1078]: [session uid=1000 pid=1078] Activating service name='com.redhat.imsettings' requested by ':1.3' (uid=1000 pid=1137 comm="/usr/libexec/imsettings-check --check-modules ")
Jan 10 17:40:42 localhost dbus-daemon[1078]: [session uid=1000 pid=1078] Activating via systemd: service name='org.gtk.vfs.Daemon' unit='gvfs-daemon.service' requested by ':1.4' (uid=1000 pid=1141 comm="/usr/libexec/imsettings-daemon ")
Jan 10 17:40:42 localhost systemd[1053]: Starting Virtual filesystem service...
Jan 10 17:40:42 localhost dbus-daemon[1078]: [session uid=1000 pid=1078] Successfully activated service 'org.gtk.vfs.Daemon'
Jan 10 17:40:42 localhost systemd[1053]: Started Virtual filesystem service.
Jan 10 17:40:42 localhost dbus-daemon[1078]: [session uid=1000 pid=1078] Successfully activated service 'com.redhat.imsettings'
Jan 10 17:40:42 localhost com.redhat.imsettings[1078]: [ 1515606042.154063]: IMSettings-Daemon[1141]: INFO: Starting imsettings-daemon...
Jan 10 17:40:42 localhost com.redhat.imsettings[1078]: [ 1515606042.154240]: IMSettings-Daemon[1141]: INFO: [HOME=/home/leigh/.config/imsettings]
Jan 10 17:40:42 localhost com.redhat.imsettings[1078]: [ 1515606042.154300]: IMSettings-Daemon[1141]: INFO: [XINPUTRCDIR=/etc/X11/xinit/]
Jan 10 17:40:42 localhost com.redhat.imsettings[1078]: [ 1515606042.154353]: IMSettings-Daemon[1141]: INFO: [XINPUTDIR=/etc/X11/xinit/xinput.d/]
Jan 10 17:40:42 localhost com.redhat.imsettings[1078]: [ 1515606042.154395]: IMSettings-Daemon[1141]: INFO: [MODULEDIR=/usr/lib64/imsettings]
Jan 10 17:40:42 localhost com.redhat.imsettings[1078]: [ 1515606042.154436]: IMSettings-Daemon[1141]: INFO: [MODULES=cinnamon-gsettings]
Jan 10 17:40:42 localhost chronyd[688]: Selected source 109.74.206.120
Jan 10 17:40:42 localhost chronyd[688]: System clock TAI offset set to 37 seconds
Jan 10 17:40:42 localhost dbus-daemon[1078]: [session uid=1000 pid=1078] Activating via systemd: service name='org.a11y.Bus' unit='at-spi-dbus-bus.service' requested by ':1.21' (uid=1000 pid=1060 comm="cinnamon-session --session cinnamon ")
I note quite a few 'label="unconfined_u:unconfined_r:unconfined_t:s0-s0' messages, can you try with selinux disabled?