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

[Stefan Bader]

Debugging ideas (from discussion with pitti on IRC):

(1) add a ps | grep ... wait loop into the hook until really all udev processes are gone that would confirm that the child processes actually run into the /dev issue
(2) some ulimit -c unlimited and copying core dumps to /run/udev/
(3) move 60-persistent-storage-dm.rules from IMPORT{program}="/sbin/blkid -o ... to IMPORT{builtin}="blkid --offset..., to see whether it's the external program which causes trouble
and (4) it would be helpful if you could confirm that you have udev processes running after the udevadm control --exit (with http://paste.ubuntu.com/5713055/)

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https://bugs.launchpad.net/bugs/1185394

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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