This package fontconfig 1:2.13.1-1 have the same issue here :
https://bugs.archlinux.org/task/59889
We need i recompiled version
Rebuilding fontconfig cache.../usr/share/fonts/100dpi: failed to write cache
/usr/share/fonts/75dpi: failed to write cache
/usr/share/fonts/cyrillic: failed to write cache
/usr/share/fonts/encodings/large: failed to write cache
/usr/share/fonts/util: failed to write cache
done.