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

[Serge Hallyn]

AIUI udevcomplete_all will clean up any hanging vgchange -a y processes,
but it won't solve the problem.  udev is supposed to, in response to the
lvs created by vgchange, call 55-dm again, and thereby create the
/dev/{vg}/{lv} links (before calling dmsetup udevcomplete ${DM_COOKIE}
to un-hang vgchange).  Those links won't get created.

(I've tested this.  In a case where /dev/schroots/kvm-1 did not get
created and vgchange was hanging, I did dmsetup udevcomplete
${DM_COOKIE}" (using the cookie shown by ipcs -a).  vgchange happily
went away, /dev/schroots/kvm-1 did not show up.

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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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