linux-kernel - Re: [PATCH] ARM: dts: meson8b: add reserved memory zone to fix silent freezes

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Message-ID: <7h1smf992b.fsf@baylibre.com>
Date:   Fri, 06 Oct 2017 15:59:40 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Linus Lüssing <linus.luessing@...3.blue>
Cc:     linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Carlo Caione <carlo@...one.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH] ARM: dts: meson8b: add reserved memory zone to fix silent freezes

Linus Lüssing <linus.luessing@...3.blue> writes:

> So far, the stress-ng tool for instance quickly resulted in a silent
> freeze of the system with no prior notice on a serial console when
> running its filesystem or memory stressor classes.
>
> Even with a panic-on-OOM and reboot-on-panic (vm.panic_on_oom=1,
> kernel.panic=10) configured, the system would neither reboot nor
> would the OOM killer get any chance to otherwise do its job.
>
> The Amlogic reference source code uses a 2MB PHYS_OFFSET. With these 2MB
> reserved via DT, stress-ng was able to run on an Odroid C1+ just fine for
> several hours, the OOM killer was able to kill processes again and if
> configured would successfully trigger a reboot of the system.
>
> Fixes: 4a69fcd3a108 ("ARM: meson: Add DTS for Odroid-C1 and Tronfy MXQ boards")
> Signed-off-by: Linus Lüssing <linus.luessing@...3.blue>

Applied to v4.15/dt with Martin's Tested-by,

Thanks,

Kevin