Date: Fri, 17 Jun 2016 09:39:26 -0600 From: Ian Lepore <ian@freebsd.org> To: Adrian Chadd <adrian.chadd@gmail.com>, Keith White <kwhite@site.uottawa.ca> Cc: freebsd-arm <freebsd-arm@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: RPI-B 11.0-ALPHA3 r301815 panic ["when connecting via WiFi"] Message-ID: <1466177966.51702.13.camel@freebsd.org> In-Reply-To: <CAJ-Vmo=xY=a5VyBeS3dgOOpdAez8MuDTWekFYTK_8iFEp6b9Lg@mail.gmail.com> References: <5B47CB62-5BB6-41F3-82F9-507B42EF161B@dsl-only.net> <alpine.BSF.2.20.1606160658100.8225@localhost.my.domain> <alpine.BSF.2.20.1606170714240.16142@localhost.my.domain> <CAJ-Vmo=xY=a5VyBeS3dgOOpdAez8MuDTWekFYTK_8iFEp6b9Lg@mail.gmail.com>
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On Fri, 2016-06-17 at 07:52 -0700, Adrian Chadd wrote:
> Just disable 11n for now. ifconfig wlan0 -ht (and reassociate.)
>
> See if it's that.
>
>
>
> -adrian
>
You can see from the crash info that it's an alignment fault:
r6 =c21a4876
ldmib r6,{r1-r2}
An ldm instruction requires 4-byte alignment. Now the question is why
undefining __NO_STRICT_ALIGNMENT didn't fix the problem. Maybe the
wifi code doesn't use __NO_STRICT_ALIGNMENT the same way other network
drivers do?
Unfortunately the pasted info lists the nearby symbol as $a.17+0x38,
which doesn't help find the actual code. A stack backtrace might help.
-- Ian
>
> On 17 June 2016 at 04:19, Keith White <kwhite@site.uottawa.ca> wrote:
> > On Thu, 16 Jun 2016, Keith White wrote:
> >
> > > On Wed, 15 Jun 2016, Mark Millard wrote:
> > >
> > > > https://lists.freebsd.org/pipermail/freebsd-current/2016-June/0
> > > > 61904.html
> > > > reports an RPI-B alignment fault for -r301815 (the snapshot)
> > > > "when
> > > > connecting via WiFi".
> > > >
> > > > -r301872 (
> > > > https://lists.freebsd.org/pipermail/svn-src-head/2016-June/0883
> > > > 39.html ) has
> > > > a fix for networking vs. alignment handling for armv6 contexts
> > > > that might be
> > > > needed. Quoting:
> > > >
> > > > > Author: ian
> > > > > Date: Mon Jun 13 16:48:27 2016
> > > > > New Revision: 301872
> > > > > URL:
> > > > > https://svnweb.freebsd.org/changeset/base/301872
> > > >
> > > > ...
> > >
> > >
> > > Thanks for pointing this out! I'll see if a (complete) rebuild
> > > at
> > > that rev fixes the problem.
> > >
> >
> > Tried that. I still get a panic.
> >
> > I cross built on an amd64 at r301840, I'll try upgrading that
> > machine too.
> >
> > In the meantime, other suggestions?
> >
> > FreeBSD 11.0-ALPHA3 #0 r301872: Thu Jun 16 21:11:44 EDT 2016
> > kwhite@freebsd11:/usr/obj/arm.armv6/usr/src/sys/RPI-B arm
> > FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based
> > on LLVM
> > 3.8.0)
> > VT: init without driver.
> > ...
> > Starting devd.
> > urtwn0: <vendor 0x0bda product 0x8176, class 0/0, rev 2.00/2.00,
> > addr 4> on
> > usbus0
> > urtwn0: MAC/BB RTL8188CUS, RF 6052 1T1R
> > urtwn0: enabling 11n
> > wlan0: Ethernet address: 00:13:ef:74:07:a8
> > Created wlan(4) interfaces: wlan0.
> > ...
> >
> > [ nc rpi-b 22 ]
> > Fatal kernel mode data abort: 'Alignment Fault' on read
> > trapframe: 0xc18f28c0
> > FSR=00000001, FAR=c21a487a, spsr=60000013
> > r0 =c07a6548, r1 =00000004, r2 =c0605338, r3 =000007b6
> > r4 =c18f2a28, r5 =c18f2b40, r6 =c21a4876, r7 =c1ccd240
> > r8 =c1ccd240, r9 =c21a4Stopped at $a.17+0x38: ldmib r6,
> > {r1-r2}
> > db>
> >
> >
> > ...keith
> > _______________________________________________
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