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

[Stefan Bader]

Updated to 202-0ubuntu11pitti2 (which dropped the dm cookie patch but
added a settle before exit in init-bottom/udev) and re-ran the reboot
tests. 5-6 times to Xen and once to non-Xen. All runs did set up all
LVs. Time waiting in settle/exit seems to be not longer (but maybe even
quicker) than before. Not related to this bug, but before there were
(even in older releases / Q and R) often messages about udev failing to
do an inotify_add_watch, which I cannot see at all with the settle. And
on reboot I saw that terminating processes seemed to not produce the
"ended after x s" message and the killing remaining processes failed.
This seems to be gone, too.

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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:
  Fix Committed

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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