linux-kernel - Math-emu kills the kernel on Athlon64 X2

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Message-ID: <9a8748490609181518j2d12e4f0l2c55e755e40d38c2@mail.gmail.com>
Date:	Tue, 19 Sep 2006 00:18:51 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Cc:	billm@...bpc.org.au, billm@...urbia.net,
	"Linus Torvalds" <torvalds@...l.org>
Subject: Math-emu kills the kernel on Athlon64 X2

Hi,

If I enable the math emulator in 2.6.18-rc7-git2 (only version I've
tried this with) and then boot the kernel with "no387" then I only get
as far as lilo's "...Booting the kernel." message and then the system
hangs.

The kernel is a 32bit kernel build for K8 and my CPU is a Athlon64 X2 4400+

If I boot the same kernel without the "no387" option, then it boots
and runs just fine, so it seems the math emulator code is lethal on
newer CPU's :-(

Now, I need some help debugging this. The crash happens very early and
doesn't result in anything printed to the screen (I guess it's too
early to call printk()) - How on earth can I get a lead on what's
going wrong?  Any help would be appreciated.

-- 
Jesper Juhl <jesper.juhl@...il.com>
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