Comment # 8 on bug 1167388 from Takashi Iwai

At best, try the latest 5.6-rc kernel in OBS Kernel:HEAD repository.
If the problem persists with it (I guess so), report it to upstream, e.g.
bugzilla.kernel.org.

But now I see that you're using Nvidia binary driver.  Could you try without
this?  We can't exclude the possibility of the bug in Nvidia driver because of
its binary-only nature.

Also, the dmesg output in comment 6 doesn't contain the Oops from ath9k.  It's
helpful to see the condition before the Oops is triggered.