linux-kernel - Re: initify plugin crashes on arm allmodconfig

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Date:   Wed, 1 Feb 2017 22:39:55 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     pageexec@...email.hu
Cc:     Kees Cook <keescook@...omium.org>,
        Emese Revfy <re.emese@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Josh Triplett <josh@...htriplett.org>,
        yamada.masahiro@...ionext.com, minipli@...linux.so,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        linux@...musvillemoes.dk, david.brown@...aro.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        tglx@...utronix.de, Andrew Morton <akpm@...ux-foundation.org>,
        jlayton@...chiereds.net, sam@...nborg.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: initify plugin crashes on arm allmodconfig

On Wed, Feb 1, 2017 at 5:07 PM, PaX Team <pageexec@...email.hu> wrote:
> On 1 Feb 2017 at 16:26, Arnd Bergmann wrote:
>> If you can't reproduce with the version below, I'll dig in further.
>
> no dice, both 5.4 and 6.3 worked fine (save for a few -Wunused-but-set-variable
> warnings).
>

Maybe one more thing to try, I've uploaded my current branch to
git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git#randconfig-4.11-next
now, so maybe try this sequence:

arnd@...rfel:~/git/arm-soc$ git fetch
git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git
randconfig-4.11-next
>From git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground
 * branch            randconfig-4.11-next -> FETCH_HEAD

arnd@...rfel:~/git/arm-soc$ git checkout FETCH_HEAD
HEAD is now at fbb1b68... fixup! [SUBMITTED 20170201] [RFC v2] sched:
make DECLARE_COMPLETION_ONSTACK() work with clang

arnd@...rfel:~/git/arm-soc$ make -skj20 O=obj-arm
CROSS_COMPILE=/home/arnd/cross-gcc/bin/arm-linux-gnueabi- ARCH=arm
allmodconfig

arnd@...rfel:~/git/arm-soc$ make -skj20 O=obj-arm
CROSS_COMPILE=/home/arnd/cross-gcc/bin/arm-linux-gnueabi- ARCH=arm
drivers/video/fbdev/atmel_lcdfb.o
CC=/home/arnd/cross-gcc/bin/arm-linux-gnueabi-gcc-5.3.1

Interestingly, the first time I run this, I seem to always get into
out-of-memory, while the second run is then an immediate crash.

     Arnd