[Bug 1818121] Re: NFSv4 shares with option `-vers=4.0` are not mounted: mount(nfs): no hosts available

[Paul Menzel]

Our NFS server is not a Ubuntu system. It’s basically an LFS based set-
up [1]. The autofs client installed on our system has no trouble
connecting to the server, so some minor detail seems to be different,
that it doesn’t work with the Ubuntu client out of the box.

[1]: https://github.molgen.mpg.de/mariux64

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Title:
  NFSv4 shares with option `-vers=4.0` are not mounted: mount(nfs): no
  hosts available

Status in autofs package in Ubuntu:
  Incomplete

Bug description:
  With Ubuntu 18.10 and autofs 5.1.2-4ubuntu1, mounting NFSv4 shares
  does not work. Directly mounting them with `mount.nfs` works.

  ```
  Feb 28 18:08:30 nfsclient automount[22978]: expire_proc: exp_proc = 131147807650128 path /home_mariux
  Feb 28 18:08:30 nfsclient automount[22978]: expire_cleanup: got thid 131147807650128 path /home_mariux stat 0
  Feb 28 18:08:30 nfsclient automount[22978]: expire_cleanup: sigchld: exp 131147807650128 finished, switching from 2 to 1
  Feb 28 18:08:30 nfsclient automount[22978]: st_ready: st_ready(): state = 2 path /home_mariux
  Feb 28 18:08:32 nfsclient automount[22978]: handle_packet: type = 3
  Feb 28 18:08:32 nfsclient automount[22978]: handle_packet_missing_indirect: token 46, name joey, request pid 28647
  Feb 28 18:08:32 nfsclient automount[22978]: attempting to mount entry /home_mariux/joey
  Feb 28 18:08:32 nfsclient automount[22978]: lookup_mount: lookup(file): looking up joey
  Feb 28 18:08:32 nfsclient automount[22978]: lookup_mount: lookup(file): joey -> claptrap:/amd/claptrap/2/home/edv/joey
  Feb 28 18:08:32 nfsclient automount[22978]: parse_mount: parse(sun): expanded entry: claptrap:/amd/claptrap/2/home/edv/joey
  Feb 28 18:08:32 nfsclient automount[22978]: parse_mount: parse(sun): gathered options: nosuid
  Feb 28 18:08:32 nfsclient automount[22978]: parse_mount: parse(sun): dequote("claptrap:/amd/claptrap/2/home/edv/joey") -> claptrap:/amd/claptrap/2/home/edv/bucz
  Feb 28 18:08:32 nfsclient automount[22978]: parse_mount: parse(sun): core of entry: options=nosuid, loc=claptrap:/amd/claptrap/2/home/edv/joey
  Feb 28 18:08:32 nfsclient automount[22978]: sun_mount: parse(sun): mounting root /home_mariux, mountpoint joey, what claptrap:/amd/claptrap/2/home/edv/joey, f
  Feb 28 18:08:32 nfsclient automount[22978]: mount_mount: mount(nfs): root=/home_mariux name=joey what=claptrap:/amd/claptrap/2/home/edv/joey, fstype=nfs, opti
  Feb 28 18:08:32 nfsclient automount[22978]: mount_mount: mount(nfs): nfs options="nosuid", nobind=0, nosymlink=0, ro=0
  Feb 28 18:08:32 nfsclient automount[22978]: get_nfs_info: called with host claptrap(141.14.16.132) proto 6 version 0x30
  Feb 28 18:08:32 nfsclient automount[22978]: get_nfs_info: called with host claptrap(141.14.16.132) proto 17 version 0x30
  Feb 28 18:08:32 nfsclient automount[22978]: mount(nfs): no hosts available
  Feb 28 18:08:32 nfsclient automount[22978]: dev_ioctl_send_fail: token = 46
  Feb 28 18:08:32 nfsclient automount[22978]: failed to mount /home_mariux/joey
  Feb 28 18:08:32 nfsclient automount[22978]: st_readmap: state 1 path /home_mariux
  Feb 28 18:08:32 nfsclient automount[22978]: handle_packet: type = 3
  Feb 28 18:08:32 nfsclient automount[22978]: handle_packet_missing_indirect: token 47, name joey, request pid 28647
  Feb 28 18:08:32 nfsclient automount[22978]: dev_ioctl_send_fail: token = 47
  Feb 28 18:08:32 nfsclient automount[22978]: re-reading map for /home_mariux
  Feb 28 18:08:32 nfsclient automount[22978]: lookup_nss_read_map: reading map file /etc/automount/auto.home
  Feb 28 18:08:32 nfsclient automount[22978]: do_init: parse(sun): init gathered global options: nosuid
  Feb 28 18:08:32 nfsclient automount[22978]: st_ready: st_ready(): state = 4 path /home_mariux
  ```

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