Public bug reported:

Binary package hint: udev

The new iwlist driver for the intel wireless cards 3945 etc installs a second 
`interface' called wmaster.
When upgrading from iwp3945 to ivl3945 udev gets confused and tries to rename 
the real interface from 
wlan0 to eth1 since there is a corresponding entry in 70-persistent-net.rules. 
It gets stuck and ends up with an
interface named wla0_rename.

Fix: adding `wmaster*' to the pattern for network cards in 
75-persistent-net-generator.rules worked for me.
It then created a rule in 70-persistent-net.rules:

SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="xxxxxxxxxxxxx",
NAME="wmaster0"

and permitted to leave the one for the real interface

SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="xxxxxxxxxxxxxxxxxx",
ATTRS{type}=="1", NAME="eth1"

unchanged. In particular this leaves the name of the interface to what it had 
been (eth1 for me), which is preferable for 
not having to change other scripts.

** Affects: udev (Ubuntu)
     Importance: Undecided
         Status: New

-- 
wmaster missing in udev
https://bugs.launchpad.net/bugs/176853
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