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

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Date:	Sun, 21 Feb 2010 13:00:02 +1000
From:	Adam Nielsen <a.nielsen@...kadi.net>
To:	Jeff Dike <jdike@...toit.com>
CC:	Américo Wang <xiyou.wangcong@...il.com>,
	LKML Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: UML broken - runaway loop modprobe binfmt-464c

>> 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.
>
> Not just 32-bit modprobe - any 32-bit binary on a 64-bit UML will
> cause this, I think.

Thanks for the suggestions.  After some more investigation and off-list 
pointers, it seems the problem is caused because compiling UML for x86_64 
doesn't allow you to enable IA32 emulation.

Is this just a case of the Kconfig option being missed, or is there a more 
fundamental reason as to why, unlike with the Linux kernel, it's not possible 
to run 32-bit apps inside a 64-bit UML?

Thanks,
Adam.
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