This is a bug in mount, not nfs-utils. The warning is simply bogus and should be ignored.
As others have pointed out, you can't just ask start-stop-daemon to make a pid file, since rpc.idmapd forks.
Thus, you end up with entirely the wrong pid, which makes "/etc/init.d/nfs-common start" fire up _another_
idmapd, and at that point things start to get all wrong.
This is a bug in mount, not nfs-utils. The warning is simply bogus and should be ignored.
As others have pointed out, you can't just ask start-stop-daemon to make a pid file, since rpc.idmapd forks. d/nfs-common start" fire up _another_
Thus, you end up with entirely the wrong pid, which makes "/etc/init.
idmapd, and at that point things start to get all wrong.
/* Steinar */
(Debian nfs-utils maintainer)