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Subject: Re: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why?
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Jeff Chua <jeff.chua.linux@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Valdis.Kletnieks@vt.edu,
       Tomasz Chmielewski <mangoo@wpkg.org>,
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       Linux Kernel <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>,
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Date: Thu, 08 Oct 2009 09:35:48 -0700
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On Fri, 2009-10-09 at 00:26 +0800, Jeff Chua wrote:
> Newly compiled 64-bit kernel hangs on a previously working pure 32-bit
> 2.6.32-rc3 system ...
> 
> VFS: Mounted root (reiserfs filesystem) readonly on device 8:2.
> Freeing unused kernel memory: 444k freed
> request_module: runaway loop modprove binfmt-464c
> request_module: runaway loop modprove binfmt-464c
> request_module: runaway loop modprove binfmt-464c
> request_module: runaway loop modprove binfmt-464c
> request_module: runaway loop modprove binfmt-464c

Take a quick look in your .config in the "Executable file formats /
Emulations" section.  Make sure that you have ia32 emulation enabled:

CONFIG_IA32_EMULATION=y

That might not have been turned on if you used a .config from an old
32-bit kernel.  

-- Dave

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