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

[Stefan Bader]

Also a braindump it gets late. Tried to figure out what changed between the udev-175 udevd and the new one. Taking away the whitespace changes. Most things are log function renames. Thought there is a hunk missing that would copy dev entries but that might have been old support code for tmpfs /dev.
There is also a related change missing from us which was handling events with timeout as urgently as dm cookie ones. And it looks a bit as the number of workers got reduced from min 128 to 8 + <nr cpus> * 2.

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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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