Description of problem:
I am booting a diskless RHEL-6 environment using dracut this way:
[victim@data ~]$ cat /proc/cmdline
initrd=rhel6-ws-boot/initramfs.img console=ttyS0,115200 console=tty0 root=nfs4:192.168.60.50:/vol/vol1/OS/rhel6/root crashkernel=256M@16M nomodeset vesa BOOT_IMAGE=rhel6-ws-boot/vmlinuz
The system boots up correctly with / mounted via nfs4 but all files are reported to be owned by root:nobody. I restarted rpc.idmapd with verbose output and it seems that there is no activity whatsoever performed by this daemon:

[root@data .snapshot]# rpc.idmapd -vvvf
rpc.idmapd: libnfsidmap: using domain: dublin.ad.s3group.com

rpc.idmapd: libnfsidmap: processing 'Method' list

rpc.idmapd: libnfsidmap: loaded plugin /usr/lib64/libnfsidmap/nsswitch.so for method nsswitch

rpc.idmapd: Expiration time is 600 seconds.
rpc.idmapd: nfsdopenone: Opening /proc/net/rpc/nfs4.nametoid/channel failed: errno 2 (No such file or directory)
rpc.idmapd: New client: 0
rpc.idmapd: New client: 2

..it stays so for ever (no matter if I try to mount something via nfs4, list content...

Note that this setup worked fine with RHEL-5

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How reproducible:
always

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