dhclient fails to obtain the IP address from some WiFi networks

[Yuri]

The laptop was getting the wifi connection right away, but dhclient was 
consistently failing to obtain the IP address.


Here are the ktrace dumps of the dhclient process of two instances of 
such failure:

* https://people.freebsd.org/~yuri/dump-dhclient-failure-1.txt

* https://people.freebsd.org/~yuri/dump-dhclient-failure-2.txt


The wifi driver was if_run.


Can anybody tell why did dhclient fail?


Yuri