Comment # 8 on bug 1209729 from Antonio Feijoo

(In reply to geheim geheim from comment #7)
> Created attachment 865903 [details]
> dracut debug output

dracut only detects that /boot is mounted and adds its proper ext2 driver. I
don't see any malfunction here.

> /usr/bin/dracut@1584(): for mp in "/" "/etc" "/bin" "/sbin" "/lib" "/lib64" "/usr" "/usr/bin" "/usr/sbin" "/usr/lib" "/usr/lib64" "/boot" "/boot/efi" "/boot/zipl"
> //usr/bin/dracut@1599(): readlink -f /
> /usr/bin/dracut@1599(): mp=/
> /usr/bin/dracut@1600(): mountpoint /
> /usr/bin/dracut@1600(): continue
> ...
> /usr/bin/dracut@1584(): for mp in "/" "/etc" "/bin" "/sbin" "/lib" "/lib64" "/usr" "/usr/bin" "/usr/sbin" "/usr/lib" "/usr/lib64" "/boot" "/boot/efi" "/boot/zipl"
> //usr/bin/dracut@1599(): readlink -f /boot
> /usr/bin/dracut@1599(): mp=/boot
> /usr/bin/dracut@1600(): mountpoint /boot
> //usr/bin/dracut@1601(): find_block_device /boot
> ...
> //usr/lib/dracut/dracut-functions.sh@437(find_mp_fstype): printf %s ext2
> //usr/lib/dracut/dracut-functions.sh@438(find_mp_fstype): return 0

Is the root partition mounted when you call dracut/zypper dup?