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

[Serge Hallyn]

The fix to the udev --exit bug did not fix this bug.  After uninstalling
my daemonizing watershed package, here is some debug info of the hung
vgchange -a y task.  It is hung in dm_udev_wait() in semop on a
semaphore which is stuck at 1.

I'm not sure what other task could have set that value (and
exited/died).  Will try (not right now) a run with udev -D.

** Attachment added: "lvm.debug"
   https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/802626/+attachment/2532644/+files/lvm.debug

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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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