linux-kernel - Nouveau crashes in 4.6-rc on arm64

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Message-ID: <57064992.1060509@arm.com>
Date:	Thu, 7 Apr 2016 12:50:42 +0100
From:	Robin Murphy <robin.murphy@....com>
To:	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	acourbot@...dia.com
Subject: Nouveau crashes in 4.6-rc on arm64

Hello,

With 4.6-rc2 (and -rc1) I'm seeing Nouveau blowing up at boot, from the 
look of it by dereferencing some offset from NULL inside 
nouveau_fbcon_imageblit(). My setup is an old XFX 7600GT card plugged 
into an ARM Juno r1 board, which works fine with 4.5 and earlier.

Attached are a couple of logs from booting arm64 defconfig plus DRM and 
Nouveau enabled - the second also has framebuffer console rotation 
turned on, which interestingly seems to move the point of failure, and 
the display does eventually come up to show the tail end of the panic in 
that case.

I might be able to find time for a full bisection next week if isn't 
something sufficiently obvious to anyone who knows this driver.

Thanks,
Robin.

View attachment "log.txt" of type "text/plain" (48776 bytes)

View attachment "log2.txt" of type "text/plain" (48723 bytes)