ath (AR9460) no longer works after going to 11-STABLE r302483

[Wolfgang Zenker]

Hi,

[sorry, forgot to Cc current first]

* Adrian Chadd <adrian at freebsd.org> [160715 22:40]:
> On 15 July 2016 at 13:28, Wolfgang Zenker <wolfgang at lyxys.ka.sub.org> wrote:
>> * Adrian Chadd <adrian at freebsd.org> [160715 00:00]:
>>> On 14 July 2016 at 14:37, Wolfgang Zenker <wolfgang at lyxys.ka.sub.org> wrote:
>>>> * Adrian Chadd <adrian at freebsd.org> [160710 21:47]:
>>>>> Since you've reverted the ath driver directories without success, I'm
>>>>> mostly out of simple ideas. I think you need to bisect the whole
>>>>> kernel version until you find the commit that broke things.

>>>> done. The commit is 11-STABLE r302410. AFAICS the only change here
>>>> is the removal of debugging options from the GENERIC kernel config:

>>>> https://svnweb.freebsd.org/base/stable/11/sys/amd64/conf/GENERIC?r1=302408&r2=302410

>>> ... loool, okay. Let me see.

>>> Try INVARIANTS and INVARIANT_SUPPORT. Maybe something in the ath
>>> driver needs it.. oops!

>> Nope, wlan0 still works after disabling INVARIANTS and INVARIANT_SUPPORT.
>> Any suggestions for next try?

> Just try disabling the others and see what happens.

commenting out DEADLKRES and MALLOC_DEBUG_MAXZONES in addition to 
INVARIANTS and INVARIANT_SUPPORT did not change the situation: ath
still worked. Re-enabling all of the above and disabling WITNESS
resulted in ath failing.

Wolfgang