Date: Fri, 17 Jun 2016 12:39:46 -0600 From: Ian Lepore <ian@freebsd.org> To: Keith White <kwhite@site.uottawa.ca> Cc: Adrian Chadd <adrian.chadd@gmail.com>, 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: <1466188786.34556.21.camel@freebsd.org> In-Reply-To: <alpine.BSF.2.20.1606171215160.3021@genf-2.site.uottawa.ca> 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> <1466177966.51702.13.camel@freebsd.org> <alpine.BSF.2.20.1606171215160.3021@genf-2.site.uottawa.ca>
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On Fri, 2016-06-17 at 12:28 -0400, Keith White wrote:
> On Fri, 17 Jun 2016, Ian Lepore wrote:
>
> > 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
> > ...
>
> What do I need to type at the "db> " prompt that would be useful?
> I should be able to access the RPI-B in 5 hours.
>
> Here's the result of a "where" taken from an earlier logged session
> (different r6 value):
>
"where" is a synonym for getting a stack backtrace, that's just what I
needed. Now I know what's wrong, but not yet how to fix it.
-- Ian
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