Comment 3 for bug 1256158

I am experiencing this as well; same macbook pro (11,1) as Julien.

I experience many occurrences of this in /var/log/syslog:
 ERROR @wl_cfg80211_get_station : Wrong Mac address

Eventually, the card disassociates, and fails repeatedly to reconnect to the AP. Sometimes it succeeds, but will fail again soon after (the driver remains in a bad state).

I have a very rough "workaround", reloading the wl module, but it's time-consuming and is no real fix.
After running this, the card reassociates on its first try, then works well until the problem re-occurs.
This indicates to me that it's a problem in the driver, not something to do with any state on the card.

sudo service network-manager stop
sudo pkill wpa_supplicant
sudo rmmod wl

sudo modprobe wl
sudo service network-manager restart