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Bug#593760: linux-image-2.6.32-5-amd64: gdb /bin/true crashes the system if oprofile is in use under xen

On Sat, Aug 21, 2010 at 05:04:02AM +0100, Ben Hutchings wrote:
> Somehow I didn't notice earlier that this is an alignment check and not
> a seg-fault or similar.  Alignment checks are normally disabled on x86.
> This may well be a bug in the hypervisor.

The hypervisor cleans the AC bit before the normal entry into the kernel. This
fix was introduced somewhere between Xen 3.0 and 3.1.

Maybe there is another path, that is unfixed. Or the OP uses Xen 3.0,
which may be unfixed.


I object to intellect without discipline;  I object to power without
constructive purpose.
		-- Spock, "The Squire of Gothos", stardate 2124.5

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