Re: [Xen-devel] Re: 2.6.37-rc1 mainline domU - BUG: unable to handle kernel paging request

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 12/02/2010 10:05 AM, Bruce Edge wrote:
> On Thu, Dec 2, 2010 at 6:41 AM, Bruce Edge <bruce.edge@xxxxxxxxx> wrote:
>>
>> On Wed, Dec 1, 2010 at 10:33 PM, Jeremy Fitzhardinge <jeremy@xxxxxxxx>
>> wrote:
>>> On 12/01/2010 01:32 PM, Bruce Edge wrote:
>>>> I just checked the recently released 2.6.73-rc4,
>>> Do you mean mainline 2.6.37-rc4, or the one in xen/next-2.6.37?
>> mainline
>>
>>>>  and while the BUG
>>>> signature is different, it still fails under NFS accesses. This is
>>>> 100% recreatable.
>>> Please try this patch which is queued up for mainline.  It's already in
>>> xen/next-2.6.37.
>> After testing the mainline .37 I also tried xen/next-2.6.37 with the same
>> result. At least, I still hit a BUG after accessing an NFS mount. I didn't
>> compare the stack, but the BUG condition looked the same.
>> I'll reconfirm the location and traceback of the xen/next kernel.
>>
>> -Bruce
>>
>>
> I re-ran the test with xen/next-2.6.37. The fault was a bit different this 
> time.
> The dom0 started spewing these as the domU appeared to hang:

OK, these look like exactly the sort of symptoms which should be fixed
by that patch, so assuming you're actually running the right kernel
(worth checking!  I get bitten by this occasionally), there's something
else going on here.

What NFS version are you using, and other parameters?  What is the NFS
server?  What's the file access pattern going on?

Thanks,
    J

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