kexec & memtest86+: inconsistent memory errors

[Forest Bond]

Hi,

On Tue, Oct 07, 2008 at 02:23:50PM -0400, Forest Bond wrote:
> We've been using kexec to drop into memtest86+ for a few years now.  We run
> memtest86+ from within our Linux-based hardware test suite.  This has always
> worked quite well.  It was painful to get running at first (kexec was still
> young then and wasn't included with our distribution's kernel), but is very easy
> to use now.
> 
> Unfortunately, though, we've hit a new snag with our latest platform version.
> This is based on Ubuntu 8.04.
> 
> Specific software version info:
> 
>   kernel version 2.6.24-19-generic
>   kexec-tools-testing 20070330 released 30th March 2007
>   memtest86+ version 2.01
> 
> The problem is that memtest86+ reports numerous memory errors when booted via
> kexec, booting directly into memtest86+ does not turn up these errors.
> 
> I suspect a device is getting mapped into memory and not deallocated prior to
> kexec execution (but I may be putting my ignorance on display).
> 
> Any ideas?

Can anyone confirm that my suspicions about this might be correct?  Can anyone
recommend troubleshooting techniques?

Thanks,
Forest
-- 
Forest Bond
http://www.alittletooquiet.net
http://www.pytagsfs.org
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