the behavior below is pretty sure fixed upstream
"Greeter becomes a zombie process after login" is marked as done
[root@srv-rhsoft:~]$ ps aux | grep sddm-greeter | grep -v grep
sddm 4337 0.0 0.3 465604 54224 ? Sl 01:54 0:41 /usr/bin/sddm-greeter --socket /tmp/sddm-:1-Xauhqj --theme /usr/share/sddm/themes/harry
root 21128 0.0 0.0 208192 12428 ? Sl 16:04 0:00 /usr/libexec/sddm-helper --socket /tmp/Auth21118.1429797892 --id 2 --start /usr/bin/sddm-greeter --socket /tmp/sddm-:1-xuMzZc --theme /usr/share/sddm/themes/harry --user sddm --greeter
sddm 21138 0.3 0.3 465576 64956 ? Sl 16:04 0:00 /usr/bin/sddm-greeter --socket /tmp/sddm-:1-xuMzZc --theme /usr/share/sddm/themes/harry
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