Module load crash and no traffic after a WPA2 handshake
One user reported a kernel NULL-pointer error when the module loaded, together with repeated fatal PCI interrupt messages. A second user described a different symptom on a low-cost PCI adapter: the WPA2 handshake completed, yet no ping or data frames were ever sent.
Swapping the card for one using another driver restored traffic with identical settings, which pointed to the driver version in use. The report listed the regulatory tools and backport release in play.
Takeaway. Report the exact kernel, the backport snapshot, the regulatory-domain setup and the first error in the log. In this case the driver version was suspected; a handshake that succeeds with no data frames is one sign that the problem may lie in the driver or firmware rather than the key.