  We describe resistive states of the system combining two types of orderings -
superconducting and ferromagnetic one. It is shown that in the presence of
magnetization dynamics such systems become inherently dissipative and in
principle cannot sustain any amount of the superconducting current because of
the voltage generated by the magnetization dynamics. We calculate generic
current-voltage characteristics of a superconductor/ferromagnet/superconductor
Josephson junction with an unpinned domain wall and find the low-current
resistance associated with the domain wall motion. We suggest the finite slope
of Shapiro steps as the characteristic feature of the regime with domain wall
oscillations driven by the ac external current flowing through the junction.
