[Bug 802626] Re: vgchange may deadlock in initramfs when VG present that's not used for rootfs

[Sergio Callegari]

As mentioned, the long delay at boot is definitely experienced by users
including me that have their root fs on LVM. The --no-udevsync
workaround fixes the issue that apparently started with the update to
3.00-14.  Personally, I suspect that some problem was present even
before 3.00-14 but occurring so rarely that one was not noticing it
(e.g. 1 slow boot every 100). With 3.00-14 the hang at boot became
sistematic.

As the original reporter of Bug #902491, I really hope that it can get
some attention (e.g., currently this bug has a 'high' importance and
that one a 'medium' one and most important this thread seems to host a
technical discussion). Note that all those on 902491 see that the --no-
udevsync workaround fixes the issue. Also note that following a
(possibly wrong) hint on my side 902491 was closed as a duplicate of the
current bug.

For the time being, following the comment by Steve I am re-opeining
902491 by removing the duplicate status.  Please let me know if it is
more appropriate to leave 902491 closed and open a new "vgchange may
deadlock in initramfs when VG present that's used for rootfs"

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https://bugs.launchpad.net/bugs/802626

Title:
  vgchange may deadlock in initramfs when VG present that's not used for
  rootfs

Status in “lvm2” package in Ubuntu:
  Triaged
Status in “udev” package in Ubuntu:
  Confirmed
Status in “lvm2” source package in Oneiric:
  Triaged
Status in “udev” source package in Oneiric:
  Confirmed

Bug description:
  The system is now unable to boot.
  I had to boot on previous kernel 3.0.0.
  Symptoms are boot freezes. When debugging, issuing a vgscan works ok.
  doing the vgchange -a y just hangs. I need to reboot the system afterwards.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: lvm2 2.02.66-4ubuntu2
  ProcVersionSignature: Ubuntu 3.0-0.1-generic 3.0.0-rc2
  Uname: Linux 3.0-0-generic x86_64
  Architecture: amd64
  Date: Mon Jun 27 18:15:46 2011
  ProcEnviron:
   LANGUAGE=fr_FR:en
   PATH=(custom, user)
   LANG=fr_FR.utf8
   LC_MESSAGES=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: lvm2
  UpgradeStatus: No upgrade log present (probably fresh install)

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