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

[Jeremy Kerr]

I'm seeing the same issue on Precise, with a non-root LVM disk: a
60-second delay in the boot process, while scripts/init-bottom/udev is
waiting for the `udevadm control --exit` process to finish, which is in
turn waiting for the `watershed vgscan; vgchange` RUN command.

When run under watershed, the vgchange process hangs forever, waiting
for a semop() syscall to return.

If I remove the watershed wrapper from the 85-lvm2 udev rule, then the
vgchange process completes sucessfully, and boot returns to normal.

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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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