Had the same problem on a Thinkpad T41 with an Atheros 5212 and moved back to 6.3, as everything works fine there. However, maybe you want to have a look at polling(4) whether ath is supported in the meantime.
Even with USB and everything that might cause conflicts disabled, I got this error on 7.0 - even if vmstat -i shows no conflicts. Maybe try this one first - disable everything that is not required and afterwards look at vmstat ...
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