linux-kernel - Re: kernel panic when using disable_mtrr_trim [was: Re: memory beyond4GB invisible to the system even though CONFIG

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Message-Id: <20090129160943.1bb0d3b5.akpm@linux-foundation.org>
Date:	Thu, 29 Jan 2009 16:09:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"James Kirin" <james.kirin40@...il.com>
Cc:	yinghai@...nel.org, rdreier@...co.com, linux-kernel@...r.kernel.org
Subject: Re: kernel panic when using disable_mtrr_trim [was: Re: memory
 beyond4GB invisible to the system even though CONFIG_HIGHMEM64G=y]

On Tue, 20 Jan 2009 13:18:15 -0500
"James Kirin" <james.kirin40@...il.com> wrote:

> Hi Yinghai,
> 
> When I boot with "disable_mtrr_trim mem=4g", the system boots fine.
> Then I changed that to
> "disable_mtrr_trim mem=6g" and a kernel panic occurs:
> 
> [...] Freeing unused kernel memory: 296k freed
> [...]  Write protecting the kernel text: 3040k
> [...]  Write protecting the kernel read-only data: 1352k
> [...]  khelper used greatest stack depth: 6724 byytes left
> [...]  Kernel panic - not syncing: No init found. Try passing init=
> option to kernel.
> 
> I can always reproduce this: all it takes it to boot from a rescue CD,
> switch between "mem=4g"  and "mem=6g" in /etc/lilo.conf, run lilo and
> reboot. If it is 4g, it boots fine; if it is 6g, a kernel panic
> occurs. No other changes at all were made.
> 
> Same thing (kernel panic) occurs if mem=5g is used.
> 
> I am attaching the kernel config used when this happens.
> 
> Please let me know how I can help fix this. Does it somehow depend on
> all those MTRR/etc memory-related options in the kernel configuration?
> 

Did this get fixed?

Which kernel versions are affected?

Thanks.
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