[Bug 833891] Re: lvscan often times out during boot

[Serge Hallyn]

Quoting Alex Lyakas (alex at zadarastorage.com):

Thanks for the information, Alex.

> Activating the LVs (that ubuntu's rule does) is perhaps not a bad thing. But
> the problem is that this is done within the context of udev event
> processing, which may cause the udev event processing to get stuck.

So I wonder if it would suffice to fire off the vgchange call asynchronously,
so that vgchange can then spin on the lock while the udev rule proceeds to
exit.  Then vgchange can proceed when udev drops the lv lock.

Does that make any sense?  It might mess up the use off watershed
though.

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https://bugs.launchpad.net/bugs/833891

Title:
  lvscan often times out during boot

Status in “udev” package in Ubuntu:
  Confirmed

Bug description:
  I'm not 100% certain that mountall is the problem, but seems a good
  place to start.

  I have some LVM partitions on my laptop, and some filesystems on there
  are mounted through fstab:

  /dev/schroots/schroots /srv/devel ext3 defaults,relatime 0 0
  /dev/schroots/isos /iso ext4 defaults,relatime 0 0

  Often (1/3 of the time?) boot hangs, and after a minute or so I get a
  message saying something about watershed and lvscan timing out.  Then
  it proceeds to mount everything readonly.

  Other times boot proceeds with no problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: mountall 2.31
  ProcVersionSignature: Ubuntu 3.0.0-9.12-generic 3.0.3
  Uname: Linux 3.0.0-9-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Thu Aug 25 10:56:52 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110627.1)
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: mountall
  UpgradeStatus: No upgrade log present (probably fresh install)

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