[Bug 525154] Re: mountall for /var or other nfs mount races with rpc.statd

[Clint Byrum]

Excerpts from dennis berger's message of Thu Oct 13 09:14:05 UTC 2011:
> It seems we ran into the same problem today.
> System is 11.04 natty from yesterday.
> 
> boot.log from today.
> 
> Begin: Loading essential drivers ... done.
> Begin: Running /scripts/init-premount ... done.
> Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
> Begin: Running /scripts/local-premount ... done.
> Begin: Running /scripts/local-bottom ... done.
> done.
> Begin: Running /scripts/init-bottom ... done.
> fsck from util-linux-ng 2.17.2
> fsck from util-linux-ng 2.17.2
> fsck from util-linux-ng 2.17.2
> /dev/mapper/raid1-root: sauber, 356460/3662848 Dateien, 12171413/14648320 Blöcke
> /dev/sda1: sauber, 236/488640 Dateien, 118485/975872 Blöcke
> /dev/mapper/raid1-profiles: sauber, 12/6553600 Dateien, 426582/26214400 Blöcke
> init: portmap-wait (statd) main process (409) killed by TERM signal^M
> init: statd-mounting main process (402) killed by TERM signal^M
> mount.nfs: Failed to resolve server apps: Name or service not known

This is a slightly different problem. Here, you don't have network yet,
so sm-notify can't lookup the server to inform it of the reboot. This
is a pretty tricky problem, but one I think that can be solved with some
TLC in the sequencing of statd and mounting.

I'd suggest opening a new bug and linking back your comment from it,
so that we can evaluate the problem.

Also if you can try a similar setup in 11.10, the way the network comes
up has changed somewhat, and may solve the issue.

Thanks!

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https://bugs.launchpad.net/bugs/525154

Title:
  mountall for /var or other nfs mount races with rpc.statd

Status in “mountall” package in Ubuntu:
  Invalid
Status in “nfs-utils” package in Ubuntu:
  Fix Released
Status in “portmap” package in Ubuntu:
  Fix Released
Status in “mountall” source package in Lucid:
  Invalid
Status in “nfs-utils” source package in Lucid:
  Fix Released
Status in “portmap” source package in Lucid:
  Fix Released
Status in “mountall” source package in Maverick:
  Invalid
Status in “nfs-utils” source package in Maverick:
  Fix Released
Status in “portmap” source package in Maverick:
  Fix Released
Status in “mountall” source package in Natty:
  Invalid
Status in “nfs-utils” source package in Natty:
  Fix Released
Status in “portmap” source package in Natty:
  Fix Released

Bug description:
  If one has /var (or /var/lib or /var/lib/nfs for that matter) on its
  own filesystem the statd.conf start races with the mounting of /var as
  rpc.statd needs /var/lib/nfs to be available in order to work.

  I am sure this is not the only occurrence of this type of problem.

  A knee-jerk solution is to simply spin in statd.conf waiting for
  /var/lib/nfs to be available, but polling sucks, especially for
  something like upstart whose whole purpose is to be an event driven
  action manager.

  SRU justification: NFS mounts do not start reliably on boot in lucid
  and maverick (depending on the filesystem layout of the client system)
  due to race conditions in the startup of statd.  This should be fixed
  so users of the latest LTS can make reliable use of NFS.

  Regression potential:  Some systems may fail to mount NFS filesystems
  at boot time that didn't fail before.  Some systems may hang at boot.
  Some systems may hang while upgrading the packages (this version or in
  a future SRU).  I believe the natty update adequately guards against
  all of these possibilities, but the risk is there.

  TEST CASE:
  1. Configure a system with /var as a separate partition.
  2. Add one or more mounts of type 'nfs' to /etc/fstab.
  3. Boot the system.
  4. Verify whether statd has started (status statd) and whether all NFS filesystems have been mounted.
  5. Repeat 3-4 until the race condition is triggered.
  6. Upgrade to the new version of portmap and nfs-common from -proposed.
  7. Repeat steps 3-4 until satisfied that statd now starts reliably and all non-gss-authenticated NFSv3 filesystems mount correctly at boot time.

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