linux-kernel - Re: Hang in fb_notifier_call_chain with nvidia framebuffer

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Message-Id: <20061007230129.323ac807.akpm@osdl.org>
Date:	Sat, 7 Oct 2006 23:01:29 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Wink Saville <wink@...ille.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Matthias Hentges <oe@...tges.net>,
	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: Hang in fb_notifier_call_chain with nvidia framebuffer

On Wed, 04 Oct 2006 09:26:04 -0700
Wink Saville <wink@...ille.com> wrote:

> Attached in the zip file is:
> 
> log-hang1.txt	-> log showing hang
> cfg-hang1	-> config file for hang condition
> cfg-ok		-> config file that works
> fbmem.c		-> Modifications to register_framebuffer
> 
> To possibly assist I turned on debugging in nvidia.c and found that it 
> hung in the call to register_framebuffer. I then added some additional 
> debug in that routine and it appears the hang occurs in the call to 
> fb_notifier_call_chain.
> 
> Please let me know what else maybe needed.

Please:

- get sysrq working:

	set CONFIG_MAGIC_SYSRQ=y, rebuild, reboot
	echo 1 > /proc/sys/kernel/sysrq
	dmesg -n 8

- make it hang

- Hit alt-sysrq-T

- Send us the resulting output

Thanks.
-
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