autofs fails to mount an IPv6 server. It seems to be that, regardless of
proto=tcp6, the DNS lookup uses IPv4:

Feb 26 15:09:15 svartkulp automount[21673]: mount_mount: mount(nfs): nfs 
options="nfsvers=4,proto=tcp6,rsize=32768,wsize=32768,soft,async,intr,noatime,nodiratime,rw",
 nobind=0, nosymlink=0, ro=0
Feb 26 15:09:15 svartkulp automount[21673]: mount_mount: mount(nfs): calling 
mkdir_path /nfs/adm
Feb 26 15:09:15 svartkulp automount[21673]: mount_mount: mount(nfs): calling 
mount -t nfs -s -o 
nfsvers=4,proto=tcp6,rsize=32768,wsize=32768,soft,async,intr,noatime,nodiratime,rw
 10.1.1.4:/filesrv/adm /nfs/adm
Feb 26 15:09:15 svartkulp automount[21673]: >> mount.nfs: Failed to resolve 
server 10.1.1.4: Address family for hostname not supported
Feb 26 15:09:15 svartkulp automount[21673]: mount(nfs): nfs: mount failure 
nfs.simula.nornet:/filesrv/adm on /nfs/adm
Feb 26 15:09:15 svartkulp automount[21673]: dev_ioctl_send_fail: token = 103
Feb 26 15:09:15 svartkulp automount[21673]: failed to mount /nfs/adm
Feb 26 15:09:15 svartkulp automount[21673]: handle_packet: type = 3
Feb 26 15:09:15 svartkulp automount[21673]: handle_packet_missing_indirect: 
token 104, name adm, request pid 21681
Feb 26 15:09:15 svartkulp automount[21673]: attempting to mount entry /nfs/adm
Feb 26 15:09:15 svartkulp automount[21673]: lookup_mount: lookup(file): looking 
up adm
Feb 26 15:09:15 svartkulp automount[21673]: dev_ioctl_send_fail: token = 104
Feb 26 15:09:15 svartkulp automount[21673]: failed to mount /nfs/adm

My system runs Ubuntu 12.04.4 LTS.

** Also affects: autofs (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: autofs5 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1101779

Title:
  autofs "lookup_mount: exports lookup" fails on IPv6-only hosts

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