I noticed the ath9k in the stack dump as well. Sony VAIO VPCCW21FD here. I do notice that my wireless is having issues where the connection is intermittent. When downloading a large file for example, there are short periods of activity, followed by long periods of no network activity. I dual boot with Windows 7 on this machine and do not see the issue on the Windows instance.
I noticed the ath9k in the stack dump as well. Sony VAIO VPCCW21FD here. I do notice that my wireless is having issues where the connection is intermittent. When downloading a large file for example, there are short periods of activity, followed by long periods of no network activity. I dual boot with Windows 7 on this machine and do not see the issue on the Windows instance.