  A new set of measurements of the top quark mass are presented, based on the
proton-proton data recorded by the CMS experiment at the LHC at sqrt(s) = 8 TeV
corresponding to a luminosity of 19.7 inverse femtobarns. The top quark mass is
measured using the lepton + jets, all-jets and dilepton decay channels, giving
values of 172.35 +/- 0.16 (stat) +/- 0.48 (syst) GeV, 172.32 +/- 0.25 (stat)
+/- 0.59 (syst) GeV, and 172.82 +/- 0.19 (stat) +/- 1.22 (syst) GeV,
respectively. When combined with the published CMS results at sqrt(s) = 7 TeV,
they provide a top quark mass measurement of 172.44 +/- 0.13 (stat) +/- 0.47
(syst) GeV. The top quark mass is also studied as a function of the event
kinematical properties in the lepton + jets decay channel. No indications of a
kinematic bias are observed and the collision data are consistent with a range
of predictions from current theoretical models of t t-bar production.
