Most likely you hit this issue: device_set_syspath: Segmentation fault logging into GNOME Shell · Issue #25299 · systemd/systemd · GitHub
No, I think that this is problem: /usr/bin/gjs: error while loading shared libraries: libmozjs-102.so: cannot open shared object file: No such file or directory
Problem is that I don’t know which package installs that library…
most likely js102
Thanx, now I log into Gnome but there is nothing except apps that I start on login.
Error is now:gsd-xsettings[101835]: Failed to get current display configuration state: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name “org.gnome.Mutter.DisplayConfig” does not exist
Maybe you have an partly updated system …
It says everything up to date. Before update, there were no problems.
Perhaps, problem is beacause I update with pacman -Syudd ?
using -dd is not recommended at all as it ignores dependency checks completely. why you came up with that?
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Well, it worked so far good 
In future, I’ll be more carefull. Googlong around problem
is probably because incompatibility between mutter and
Gnome settings.