> Just a vanilla linux. No udev.

So likely a userspace problem where udev is now assumed to be present.
 
quoted text
> > Provide long listing of /dev/mapper and any dm/lvm devices in /dev.

You can do that by running:
  ls -l /dev/mapper /dev/vg01

Also:
  cat /proc/devices
  cat /proc/misc

Alasdair

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