Why do I see multipath errors calling out path prioritizers when /tmp is mounted with nodev option on RHEL5 ?

# multipath -ll
/sbin/mpath_prio_hds_modular exitted with 1
error calling out /sbin/mpath_prio_hds_modular 8:48
/sbin/mpath_prio_hds_modular exitted with 1
error calling out /sbin/mpath_prio_hds_modular 8:112
/sbin/mpath_prio_hds_modular exitted with 1
error calling out /sbin/mpath_prio_hds_modular 8:80
/sbin/mpath_prio_hds_modular exitted with 1
error calling out /sbin/mpath_prio_hds_modular 8:144
mpath2 (1HITACHI_770135270187) dm-5 HITACHI,DF600F
[size=30G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=-2][active]
 \_ 5:0:0:1 sdd 8:48  [active][ready]
 \_ 6:0:0:1 sdh 8:112 [active][ready]
\_ round-robin 0 [prio=-2][enabled]
 \_ 5:0:1:1 sdf 8:80  [active][ready]
 \_ 6:0:1:1 sdj 8:144 [active][ready]