linux-kernel - [REGRESSION] Xorg segfaults on Asus Chromebook CP101 with Linux v5.2 (was Asus C101P Chromeboot fails to boot with Linux 5.2)

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Message-ID: <f47f8759-8113-812a-b17a-4be09665369e@gmx.co.uk>
Date:   Sat, 13 Jul 2019 12:38:45 +0100
From:   Alex Dewar <alex.dewar@....co.uk>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Boris Brezillon <boris.brezillon@...labora.com>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org
Subject: [REGRESSION] Xorg segfaults on Asus Chromebook CP101 with Linux v5.2
 (was Asus C101P Chromeboot fails to boot with Linux 5.2)

Hi all,

I initially thought my machine was failing to boot entirely, but it
turns out it was just failing to start the display manager. I managed to
escape to a tty by hammering the keyboard a bit.

I suspect the culprit is the rockchip_vpu driver (in staging/media),
which has been renamed to hantro in this merge window. When I run startx
from a terminal, X fails to start and Xorg segfaults (log here:
http://users.sussex.ac.uk/~ad374/xorg.log). X seems to work without any
issues in v5.1.

I've also tried running trace on the Xorg process, but the output was
pretty verbose. I can share if that would be helpful though.

Best,
Alex