[Bug 1185394] Re: systemd-udev fails when processing many logical volumes on boot

[Stefan Bader]

So summarizing: Maybe two problems:

1. Boot as Xen host, higher chance of having the segfault resulting in
udevadm returning before workers have ended and that yields /dev/null
not found.

2. Some problem in the sequence leading to missed events. Could be that
vgchange running after udevd terminates. Any events created there
probably are lost...

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Title:
  systemd-udev fails when processing many logical volumes on boot

Status in “systemd” package in Ubuntu:
  In Progress

Bug description:
  With recent systemd/udev updates in Saucy I see problems when /dev
  gets moved to the real root. It seems to be related to running
  vgscan/vgchange through watershed by systemd-udevd. The symptoms
  include a crash of one systemd-udevd process and several messages
  about systemd-udevd (or childs of it) not finding files in /dev.

  Setup:

  sda: contains the root fs (no separate /boot) and a swap partition
  sdb: contains vg1 with /home
  sdc and sdd: contain vg2 with 31 LVs, one of them mounted to /home/isos

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