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From: Martin Roukala <martin.roukala@mupuf.org>
To: Maxime Ripard <maxime@cerno.tech>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Daniel Vetter <daniel.vetter@intel.com>,
	David Airlie <airlied@linux.ie>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Christoph Lameter <cl@linux.com>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	Roman Gushchin <roman.gushchin@linux.dev>
Cc: netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	dri-devel@lists.freedesktop.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: RaspberryPi4 Panic in net_ns_init()
Date: Thu, 8 Sep 2022 11:14:29 +0300	[thread overview]
Message-ID: <cc9ff9ea-1f2e-16e9-a612-2ad4521440a6@mupuf.org> (raw)
In-Reply-To: <20220905111832.73nqtlzpiuwpj7lx@houat>

On 9/5/22 14:18, Maxime Ripard wrote:
> On Wed, Aug 31, 2022 at 04:42:05PM +0200, Maxime Ripard wrote:
>> Sorry for the fairly broad list of recipients, I'm not entirely sure
>> where the issue lies exactly, and it seems like multiple areas are
>> involved.
>>
>> Martin reported me an issue discovered with the VC4 DRM driver that
>> would prevent the RaspberryPi4 from booting entirely. At boot, and
>> apparently before the console initialization, the board would just die.
>>
>> It first appeared when both DYNAMIC_DEBUG and DRM_VC4 were built-in. We
>> started to look into what configuration would trigger it.
>>
>> It looks like a good reproducer is:
>>
>> ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make -j18 defconfig mod2yesconfig
>> ./scripts/config -e CONFIG_DYNAMIC_DEBUG
>> ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make -j18 olddefconfig
> 
> Interestingly, this was making the kernel Image cross the 64MB boundary.
> I've compiled the same configuration but with -Os, and then tried to
> boot the failing configuration with U-Boot instead of the RaspberryPi
> firmware, and both of them worked. I guess that leaves us with a
> bootloader bug, and nothing related to Linux after all.
> 
> Sorry for the noise,
> Maxime

Thanks a lot for figuring this out, Maxime! The idea to use -Os is much 
nicer than what I was going for: padding a working kernel with 0s at the 
end!

I unfortunately did not try to reproduce your success with u-boot, but 
I'll get to it in the near future.

Thanks again to everyone involved for all the help and support!
Martin


      reply	other threads:[~2022-09-08  8:15 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-31 14:42 RaspberryPi4 Panic in net_ns_init() Maxime Ripard
2022-09-05 11:18 ` Maxime Ripard
2022-09-08  8:14   ` Martin Roukala [this message]

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