Date: Sun, 17 Jul 2016 12:47:55 +0200 From: Wolfgang Zenker <wolfgang@lyxys.ka.sub.org> To: Adrian Chadd <adrian@freebsd.org> Cc: "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org> Subject: Re: ath (AR9460) no longer works after going to 11-STABLE r302483 Message-ID: <20160717104755.GA74205@lyxys.ka.sub.org> In-Reply-To: <CAJ-VmomF6CvSriHu87uRnzqZJf7JhyHJz8gLVF-mWNoiZfsqFw@mail.gmail.com> References: <CAJ-Vmo=MYR9H=h2j9b1_ruOwfssJnwEVJRL27UvqFEWdf1rB2Q@mail.gmail.com> <20160710174746.GA29034@lyxys.ka.sub.org> <20160710175300.GB29034@lyxys.ka.sub.org> <CAJ-VmokcVnMYr6cnznQKDPr=viViBUe09Hp7H5P7kmZSAxnjPQ@mail.gmail.com> <20160714213758.GA17141@lyxys.ka.sub.org> <CAJ-VmomyruQwO0sLEEvi=ymcFiegCOriaTvSF7bcRQfe7ftPhA@mail.gmail.com> <20160715202803.GA38281@lyxys.ka.sub.org> <CAJ-VmomVdP2XxL1Z9cje_yk5d3N18vofQb5i6WELCumaN6XAsA@mail.gmail.com> <20160716093010.GA50786@lyxys.ka.sub.org> <CAJ-VmomF6CvSriHu87uRnzqZJf7JhyHJz8gLVF-mWNoiZfsqFw@mail.gmail.com>
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* Adrian Chadd <adrian@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@lyxys.ka.sub.org> wrote: > > Hi, > > > > * Adrian Chadd <adrian@freebsd.org> [160715 22:40]: > >> On 15 July 2016 at 13:28, Wolfgang Zenker <wolfgang@lyxys.ka.sub.org> wrote: > >>> * Adrian Chadd <adrian@freebsd.org> [160715 00:00]: > >>>> On 14 July 2016 at 14:37, Wolfgang Zenker <wolfgang@lyxys.ka.sub.org> wrote: > >>>>> * Adrian Chadd <adrian@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
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