Re: [Xen-devel] HVMs terminating as (null)

[Steven Haigh <netwiz@xxxxxxxxx>]

On 24/11/13 07:03, Andrew Cooper wrote:
> On 23/11/13 19:56, Steven Haigh wrote:
>> On 24/11/13 06:38, Steven Haigh wrote:
>>> On 24/11/13 06:27, Olaf Hering wrote:
>>>> On Sun, Nov 24, Steven Haigh wrote:
>>>>
>>>>> Running Xen 4.2.3 with all the current XSA fixes.
>>>>
>>>> How exactly did you start the guests?
>>>
>>> The DomUs were started with: xl create /etc/xen/<configfile>
>>>
>>>> Does 'ps faxu' show qemu processes for the listed domain_ids?
>>>> What is the 'xenstore-ls -f | sort' output?
>>>
>>> I'll have to check this when I manage to reproduce it. So far, I have
>>> been unable to get a reliable way to reproduce it. I managed to get a
>>> system to do it every time a HVM DomU was shutdown OR restarted - but
>>> after a reboot of the Dom0 I can't get it into that state again.
>>>
>>> As soon as I can get a system in this state again, I'll leave it to see
>>> what information I can extract.
>>
>> Ha! As always, as soon as I send this, I notice its happened on a Dom0.
>>
>> # xl list
>> Name                                        ID   Mem VCPUs      State
>> Time(s)
>> Domain-0                                     0  1579     2     r-----
>>  2731.3
>> planner.vm                                   1  1013     1     -b----
>>   189.3
>> (null)                                       2     0     1     --psrd
>>   301.1
>> tracker.vm                                   3  1013     2     -b----
>>   834.4
>>
>> Attached is the output of:
>> # xl debug-keys q
>> # xl dmesg  > xen-dmesg.log
>> # gzip xen-dmesg.log
> 
> Ok - from dmesg.
> 
> (XEN) General information for domain 2:
> (XEN)     refcnt=1 dying=2 pause_count=2
> (XEN)     nr_pages=2 xenheap_pages=0 shared_pages=0 paged_pages=0
> dirty_cpus={} max_pages=262400
> (XEN)     handle=ef58ef1a-784d-4e59-8079-42bdee87f219 vm_assist=00000000
> (XEN)     paging assistance: hap refcounts translate external
> ...
> (XEN) Memory pages belonging to domain 2:
> (XEN)     DomPage 00000000000866e0: caf=00000001, taf=0000000000000000
> (XEN)     DomPage 00000000000866e1: caf=00000001, taf=0000000000000000
> (XEN)     PoD entries=0 cachesize=0
> 
> 
> So there are indeed two outstanding pages causing this domain to become
> a zombie.  They are normal pages, with 1 outstanding ref.
> 
> Can you collect "xl debug-keys g" as well?

Sure - attached.

-- 
Steven Haigh

Email: netwiz@xxxxxxxxx
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299

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