also affect kernel 4.17rc2 kernels 4.15.18 and 4.16.2 work fine
issue still present in 4.16.5
some more info: im using manjaro my mobo is asus b350m-e no error is shown when shutdown or rebooting, system just freezes with the same text as a normal shutdown
bug fixed in 4.17rc3
bug still present in 4.16.6 leaving it open until its also fixed there
bug fixed also in 4.16.7 closing