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Date:      Fri, 14 Nov 2014 12:03:53 +0000
From:      Andrew Turner <andrew@fubar.geek.nz>
To:        Ulrich Grey <usenet@ulrich-grey.de>
Cc:        freebsd-arm@freebsd.org, Rui Paulo <rpaulo@me.com>
Subject:   Re: Wandboard-Quad crashes
Message-ID:  <20141114120353.49988a3e@bender.lan>
In-Reply-To: <20141114120521.06926bd12d6b2958c6f380dc@ulrich-grey.de>
References:  <20141113125236.b16cd4e5f0e339eac0494cd4@ulrich-grey.de> <C6FED1A5-490C-47BE-B071-484271ED370E@me.com> <20141114120521.06926bd12d6b2958c6f380dc@ulrich-grey.de>

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On Fri, 14 Nov 2014 12:05:21 +0100
Ulrich Grey <usenet@ulrich-grey.de> wrote:

> On Thu, 13 Nov 2014 08:37:13 -0800
> Rui Paulo <rpaulo@me.com> wrote:
> 
> > On Nov 13, 2014, at 03:52, Ulrich Grey <usenet@ulrich-grey.de>
> > wrote:
> > > 
> > > I am running FreeBSD on a Wandboard-Quad:
> > > 
> > > FreeBSD 11.0-CURRENT #0 r274420M: Wed Nov 12 14:17:26 UTC 2014
> > >    user@quad:/usr/local/DEVEL/obj/usr/local/DEVEL/SRC/head/sys/WANDBOARD-QUAD
> > > arm FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final
> > > 208032) 20140512 WARNING: WITNESS option enabled, expect reduced
> > > performance. CPU: Cortex A9-r2 rev 10 (Cortex-A core)
> > > Supported features: ARM_ISA THUMB2 JAZELLE THUMBEE ARMv4
> > > Security_Ext
> > > 
> > > If I try to compile x11/libX11 the system frequently crashes:
> > > 
> > > Fatal kernel mode data abort: 'Alignment Fault 1'
> > > trapframe: 0xf72e0ae8
> > > FSR=00000001, FAR=000000a7, spsr=60000013
> > > r0 =00000004, r1 =00000000, r2 =c242b953, r3 =00000970
> > > r4 =c847fd80, r5 =c242b953, r6 =000000a7, r7 =c7df6810
> > > r8 =00000000, r9 =00000097, r10=00000970, r11=f72e0b68
> > > r12=000000c0, ssp=f72e0b38, slr=c220ebf4, pc =c214fbb4
> > > 
> > > [ thread pid 23015 tid 100147 ]
> > > 
> > > Stopped at      __mtx_lock_flags+0x50:  ldr     r0, [r6]
> > > 
> > > What can I do?
> > 
> > Can you send us the backtrace?
> > 
> > --
> > Rui Paulo
> > 
> --------------------------------------------------------
> 
> After some hours compiling, the Wandboard crashes again:

This looks similar to the problem I have seen compiling ports on a
Wandboard. It appears to be a bug in the pmap code but I never tracked
it down, and in the end used the pmap implementation from Svatopluk
Kraus and Michal Melound.

Unfortunately I don't have the time to shepard this code into the tree
at the moment.

Andrew



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