Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Wed, 1 Jan 2020 19:18:57 +0100
From:   Jonathan =?utf-8?Q?Neusch=C3=A4fer?= <j.neuschaefer@gmx.net>
To:     Brian Masney <masneyb@onstation.org>
Cc:     robdclark@gmail.com, bjorn.andersson@linaro.org, joro@8bytes.org,
        agross@kernel.org, iommu@lists.linux-foundation.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] iommu/qcom: fix NULL pointer dereference during probe
 deferral
Message-ID: <20200101181857.GB2110@latitude>
References: <20200101033949.755-1-masneyb@onstation.org>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha512;
        protocol="application/pgp-signature"; boundary="mP3DRpeJDSE+ciuQ"
Content-Disposition: inline
In-Reply-To: <20200101033949.755-1-masneyb@onstation.org>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


--mP3DRpeJDSE+ciuQ
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Tue, Dec 31, 2019 at 10:39:49PM -0500, Brian Masney wrote:
[...]
>     (kernel_init) from ret_from_fork (arch/arm/kernel/entry-common.S:156)
>     Exception stack(0xee89dfb0 to 0xee89dff8)
>     dfa0:                                     00000000 00000000 00000000 =
00000000
>     dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 =
00000000
>     dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
>     Code: e92d4070 e1a04000 e3a01004 e240501c (e5930014)

This looks like ARM code...

>     All code
>     =3D=3D=3D=3D=3D=3D=3D=3D
>        0:	70 40                	jo     0x42
>        2:	2d e9 00 40 a0       	sub    $0xa04000e9,%eax
>        7:	e1 04                	loope  0xd
>        9:	10 a0 e3 1c 50 40    	adc    %ah,0x40501ce3(%rax)
>        f:	e2 14                	loop   0x25
>       11:*	00                   	.byte 0x0		<-- trapping instruction
>       12:	93                   	xchg   %eax,%ebx
>       13:	e5                   	.byte 0xe5

=2E.. disassembled as x86 code.

I suspect that scripts/decodecode picked up the wrong architecture
somehow. Perhaps CROSS_COMPILE wasn't set?

>=20
>     Code starting with the faulting instruction
>     =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>        0:	14 00                	adc    $0x0,%al
>        2:	93                   	xchg   %eax,%ebx
>        3:	e5                   	.byte 0xe5


Greetings and a happy new year,
Jonathan Neusch=C3=A4fer

--mP3DRpeJDSE+ciuQ
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----
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=xMEO
-----END PGP SIGNATURE-----

--mP3DRpeJDSE+ciuQ--