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

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Message-ID: <baeb34bc0901201018s5c6eaedcp9ba0dc7e81642509@mail.gmail.com>
Date:	Tue, 20 Jan 2009 13:18:15 -0500
From:	"James Kirin" <james.kirin40@...il.com>
To:	"Yinghai Lu" <yinghai@...nel.org>
Cc:	"Roland Dreier" <rdreier@...co.com>, linux-kernel@...r.kernel.org
Subject: kernel panic when using disable_mtrr_trim [was: Re: memory beyond4GB invisible to the system even though CONFIG_HIGHMEM64G=y]

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?

Thank you so much,

James

Download attachment "kernel.config" of type "application/octet-stream" (46613 bytes)