Re: [Xen-devel] [Xen on Arm BUG] Alignment trap: not handling instruction

[Sander Bogaert <sander.bogaert@xxxxxxxxxxxxx>]

On 2 May 2013 15:44, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Thu, 2013-05-02 at 12:46 +0100, Sander Bogaert wrote:
>> Hi,
>>
>> just a small bug report, not sure if it's useful. I was just
>> installing some packages, not doing anything fancy, and I got:
>>
>> [ 1113.248819] Alignment trap: not handling instruction e8513f00 at 
>> [<b6e88a52>]
>> [ 1113.254644] Unhandled fault: alignment exception (0x001) at 0x20746e6f
>
> That looks like a kernel message? I assume it was running under Xen.

Yes it was.

>
> 0xb.... is a userspace address, so some bit of userspace is up to
> "something".

I'm still learning of course, I missed this. So basically
Xen is mapped on 0x5000000 - ...
Dom0 kernel on 0x8000000 - ...

If an address isn't in those ( physical ) ranges then it's userspace.
Is that correct?

>
> I'd have to reread the bits of the ARM and virt extensions to know if
> this was our doing ;-)

I was just assuming since it's a trap but it could indeed be one Xen
isn't set up to receive. Since I'm using a recent linux kernel and
wasn't doing anything funny, just normal usage, I was thinking the
'odd factor' was Xen underneath. I'll figure out which instruction
e8513f00 is.

Thanks for the help.

>
>>
>> there were no crashes, this just popped up.
>>
>> Sander
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-devel
>
>

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