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

[Ivan Vučica]

I believe I may have this issue after upgrade to 16.04.

- root=/dev/mapper/MyLV-Linux locks up and halts after "Begin: Running /scripts/local-top". Debugging described below makes me think this is actually inside /scripts/local-top/lvm2.
- Removing root= drops me into (initramfs) and lets me do some debugging.
- "lvm lvchange -ay --sysinit MyLV/Linux" locks up. (For this reason, I send it into background with &.)
- "kill -9" on the lvchange process + "dmsetup mknodes" results in functional and mountable devices appearing in /dev/mapper.
- "lvm lvchange -ay --noudevsync MyLV/Linux &" helps avoid the lockup.
- "lvm lvchange -ay -v -v -v --sysinit MyLV/Linux &" ends with, approx:
Udev cookie 0xsomething (semid 65538) decremented to 6
Udev cookie 0xsomething (semid 65538) waiting for zero
- "dmsetup udevcomplete_all" results in lvchange process being unblocked. However, no /dev/mapper devices are created.
- "/lib/systemd/systemd-udevd" is not running (though this may be due to init-bottom scripts having run already). Starting it does not make a difference either; the relevant cookie is still stuck at value '6'.

Does this sound relevant? Should I file a new bug?

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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:
  Invalid
Status in udev package in Ubuntu:
  Fix Released
Status in lvm2 source package in Oneiric:
  Invalid
Status in udev source package in Oneiric:
  Fix Released
Status in lvm2 source package in Precise:
  Invalid
Status in udev source package in Precise:
  Fix Released

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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