Re: [Xen-devel] Error during domain creation on xen 4.8

[Sarah Newman <srn@xxxxxxxxx>]

On 06/13/2017 10:28 AM, Sarah Newman wrote:
> On 06/13/2017 10:08 AM, Wei Liu wrote:
>> On Tue, Jun 13, 2017 at 05:56:26PM +0100, Wei Liu wrote:
>>> On Tue, Jun 13, 2017 at 09:29:22AM -0700, Sarah Newman wrote:
>>>> Hi,
>>>>
>>>> With xen 4.8.1, I got the error message:
>>>>
>>>> libxl: error: libxl_dom.c:60:libxl__domain_cpupool: got info for dom2098, 
>>>> wanted dom2097
>>>> : No such file or directory
>>>>
>>>> This was while creating an HVM domain with a stub domain, probably 
>>>> concurrent to creating a PV domain. The domains were created as 2098 + 
>>>> 2099 I
>>>> believe. I was also using oxenstored.
>>>
>>> The xc_domain_getinfolist function is a bit awful to work with.
>>
>> To give you a bit more information: that function searches for N domains
>> starting from the one you specify.
>>
>> That the parameter was 2097 but there wasn't dom2097 in Xen, so Xen
>> returned 2098. The toolstack (correctly) bailed out.
>>
>> I'm still a bit baffled at this point. Maybe 2097 crashed?
>>
> 
> It was probably a domain shut down on purpose. Rerunning with -vvv.
> 
> --Sarah
> 

Could this be happening from the block script? There's a function that uses 
xenstore (I'm using oxenstored) and checks whether a given block device is
in use by the dom0 or another guest.

libxl: debug: libxl_device.c:1157:device_hotplug: calling hotplug script: 
/etc/xen/scripts/block add
libxl: debug: libxl_device.c:1158:device_hotplug: extra args:
libxl: debug: libxl_device.c:1166:device_hotplug: env:
libxl: debug: libxl_device.c:1173:device_hotplug:       script: 
/etc/xen/scripts/block
libxl: debug: libxl_device.c:1173:device_hotplug:       XENBUS_TYPE: vbd
libxl: debug: libxl_device.c:1173:device_hotplug:       XENBUS_PATH: 
backend/vbd/2853/268441856
libxl: debug: libxl_device.c:1173:device_hotplug:       XENBUS_BASE_PATH: 
backend
libxl: debug: libxl_aoutils.c:593:libxl__async_exec_start: forking to execute: 
/etc/xen/scripts/block add
libxl: debug: libxl_event.c:686:libxl__ev_xswatch_deregister: watch 
w=0x1ad98f0: deregister unregistered
libxl: debug: libxl_linux.c:200:libxl__get_hotplug_script_info: num_exec 1, not 
running hotplug scripts
libxl: debug: libxl_device.c:1143:device_hotplug: No hotplug script to execute
libxl: debug: libxl_event.c:686:libxl__ev_xswatch_deregister: watch 
w=0x1ad98f0: deregister unregistered
libxl: error: libxl_dom.c:60:libxl__domain_cpupool: got info for dom2852, 
wanted dom2851
: No such file or directory
libxl: debug: libxl_numa.c:502:libxl__get_numa_candidate: New best NUMA 
placement candidate found: nr_nodes=1, nr_cpus=20, nr_vcpus=184, 
free_memkb=151897
libxl: debug: libxl_numa.c:502:libxl__get_numa_candidate: New best NUMA 
placement candidate found: nr_nodes=1, nr_cpus=20, nr_vcpus=183, 
free_memkb=157905


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