Re: [Xen-devel] Question of xl dump-core

[wj zhou <zhouwjenter@xxxxxxxxx>]

Hi,

Thanks a lot for your reply!

On Tue, Jun 14, 2016 at 11:02 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Tue, Jun 14, 2016 at 08:21:16AM +0800, wj zhou wrote:
>> Hello all,
>
> Hey,
>
> CC-ing Daniel, and Dave.
>>
>> Sorry to disturb you, but I really want to figure it out.
>> The xen core of redhat 6 with pod is unable to be used with crash.
>>
>> I installed a hvm of redhat 6 by xen 4.7.0-rc2.
>> And the memory is set as below:
>> memory=1024
>> maxmem=4096
>>
>> "xl dump-core" is executed, and the core is produced successfully.
>> I got the following message:
>> xc: info: exceeded nr_pages (261111) losing pages
>>
>> Unfortunately, I got some errors when executing crash with it.
>> The below is the log of crash.
>>
>> <cut>
>> crash 7.0.9-4.el7
>
> http://people.redhat.com/anderson says that the latest is 7.1.5.
> Can you try that version?
>

I have just tried the latest crash version, and got the same error message.
Since the following info exists, I think there is something wrong in xen.
xc: info: exceeded nr_pages (261111) losing pages

>> ...
>>
>> please wait... (gathering kmem slab cache data)
>> crash: read error: kernel virtual address: ffff88010b532e00  type:
>> "kmem_cache buffer"
>>
>> crash: unable to initialize kmem slab cache subsystem
>>
>> please wait... (gathering module symbol data)
>> crash: read error: physical address: 1058a1000  type: "page table"
>> <cut>
>>
>> I knew balloon is not supported by redhat 6, so pod is also not supported.
>
> ?
>

In redhat 6 hvm, there is no balloon module.

>> But I wonder the reason why the above error happens.
>> Balloon and pod are also not supported by redhat 7, but it won't
>> happen in redhat 7 hvm.
>> I'm very appreciated if someone can help me.
>
> Well, does it work if you maxmem != memory ?
>

Yes, it works in redhat 7 hvm when maxmem>memory.

But I found something strange.
"free -m" performs quite different between redhat6 and redhat7 hvm.
In redhat 6 the value by "free -m" equals maxmem(4096).
However, in redhat 7 it equals memory(1024),

-- 
Regards
Zhou

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