Re: HVMs terminating as (null)

[Andrew Cooper <andrew.cooper3@citrix.com>]

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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?

~Andrew



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