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

[Kees Cook]

On Fri, Sep 23, 2011 at 11:23:33PM -0000, Serge Hallyn wrote:
> Does that make any sense?  It might mess up the use off watershed
> though.

watershed is there to keep multiple invocations of effectively the same
event in check. For example, each time a pv appears, we attempt to activate
all VGs. But if all the drives suddenly appear at once, we only need
to attempt the activation once. (See the extensive comments at the start of
watershed.c in the watershed package.)

It might be interesting to see if races are solved (or introduced) by
having watershed itself offer a "daemonize" option to put itself in the
background and immediately return to the caller (udev). This may solve it.

On the other hand, perhaps the solution is to fix up the udev rule to only
apply to PVs, and nothing else, as it certainly wasn't designed to run when
creating an LV.

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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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