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

[Adrian Chadd]

ok, I'll go try a stable/11 install on a device with an AR9462 and report back.

re@, I know its late notice, but i'd really like this fixed in
stable/11, so heads up for whenever I figure out what broke!



-a


On 17 July 2016 at 03:47, Wolfgang Zenker <wolfgang at lyxys.ka.sub.org> wrote:
> * Adrian Chadd <adrian at freebsd.org> [160716 17:52]:
>> ...
>
>> I'm confused as to what's going on..
>
> smells like a race condition unmasked by changed timing to me.
> But I admit I have no clue at all how that wlan stuff works and if
> it is even possible for such a race condition to exist, much less
> how to debug this.
>
>> On 16 July 2016 at 02:30, Wolfgang Zenker <wolfgang at lyxys.ka.sub.org> wrote:
>> > Hi,
>> >
>> > * 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