linux-kernel - Re: UML broken - runaway loop modprobe binfmt-464c

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Date:	Mon, 15 Feb 2010 19:37:30 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Adam Nielsen <a.nielsen@...kadi.net>
Cc:	LKML Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: UML broken - runaway loop modprobe binfmt-464c

On Mon, Feb 15, 2010 at 04:47:49PM +1000, Adam Nielsen wrote:
> Hi all,
>
> I've been forced to upgrade an old machine running a couple of UML VMs, 
> but I can't for the life of me figure out how to make them work on the 
> new machine.
>
> I've compiled the latest kernel from kernel.org with ARCH=um and when I 
> run it says this a few times and then stops:
>
> request_module: runaway loop modprobe binfmt-464c
>
> From Google it appears the cause of this is when you run a 64-bit system 
> with a 32-bit kernel, but I'm running a 64-bit kernel with a 32-bit 
> system.  I vaguely recall something about IA32 emulation in the normal 
> kernel build, but I can't see anything like that in the UML kernel 
> config.
>
> Does anyone know what might fix this?
>

So you are using 32-bit modprobe binary and 64-bit kernel?

This will not work, since kernel binfmt_elf module checks
if e_machine is EM_X86_64.

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