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Subject: Re: [PATCH v6 0/6] KASan for arm
To:     Marco Felsch <m.felsch@pengutronix.de>,
        Florian Fainelli <f.fainelli@gmail.com>
Cc:     mark.rutland@arm.com, alexandre.belloni@bootlin.com,
        mhocko@suse.com, julien.thierry@arm.com, catalin.marinas@arm.com,
        christoffer.dall@arm.com, dhowells@redhat.com,
        yamada.masahiro@socionext.com, ryabinin.a.a@gmail.com,
        glider@google.com, kvmarm@lists.cs.columbia.edu, corbet@lwn.net,
        liuwenliang@huawei.com, daniel.lezcano@linaro.org,
        linux@armlinux.org.uk, kasan-dev@googlegroups.com,
        geert@linux-m68k.org, dvyukov@google.com,
        bcm-kernel-feedback-list@broadcom.com, drjones@redhat.com,
        vladimir.murzin@arm.com, keescook@chromium.org, arnd@arndb.de,
        marc.zyngier@arm.com, andre.przywara@arm.com, pombredanne@nexb.com,
        jinb.park7@gmail.com, tglx@linutronix.de, kernel@pengutronix.de,
        linux-arm-kernel@lists.infradead.org, nico@fluxnic.net,
        gregkh@linuxfoundation.org, ard.biesheuvel@linaro.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        rob@landley.net, philip@cog.systems, akpm@linux-foundation.org,
        thgarnie@google.com, kirill.shutemov@linux.intel.com
References: <20190617221134.9930-1-f.fainelli@gmail.com>
 <20191114181243.q37rxoo3seds6oxy@pengutronix.de>
 <7322163f-e08e-a6b7-b143-e9d59917ee5b@gmail.com>
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From:   Florian Fainelli <f.fainelli@gmail.com>
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Date:   Mon, 18 Nov 2019 16:13:55 -0800
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Sender: linux-kernel-owner@vger.kernel.org
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On 11/15/19 3:44 AM, Marco Felsch wrote:
> 
> With your v7 it is working on my imx6 but unfortunately I can't run my
> gstreamer testcase. My CPU load goes to 100% after starting gstreamer
> and nothing happens.. But the test_kasan module works =) So I decided to
> check a imx6quadplus but this target did not boot.. I used another
> toolchain for the imx6quadplus gcc-9 instead of gcc-8. So it seems that
> something went wrong during compilation. Because you didn't changed
> something within the logic.
> 
> I wonder why we must not define the CONFIG_KASAN_SHADOW_OFFSET for arm.

That is was oversight. I have pushed updates to the branch here:

https://github.com/ffainelli/linux/pull/new/kasan-v7

which defines CONFIG_KASAN_SHADOW_OFFSET from the PAGE_OFFSET value
directly, and recalculate KASAN_SHADOW_START/END accordingly using the
same formula as ARM64.

can you try them out? If that still does not work, can you detail the
imx6qdp memory layout a little more? Any chance of running a kernel with
DEBUG_LL/EARLYPRINTK turned on so we can see where the problem could be?
-- 
Florian