Re: [Xen-devel] pvh+vcpus startup issue

[Juergen Gross <jgross@xxxxxxxx>]

On 28/02/18 09:27, Roger Pau Monné wrote:
> On Wed, Feb 28, 2018 at 01:34:31PM +1300, xen@xxxxxxxxxxxxxxxxxx wrote:
>>
>> Regards, Peter
>> http://ri.mu Startups start here.  Hosting.  DNS.  Offsite backups.  
>> Monitoring.  Email.
>>
>> On 27/02/18 12:42 AM, Juergen Gross wrote:
>>> On 22/02/18 21:38, xen@xxxxxxxxxxxxxxxxxx wrote:
>>>> On 22/02/18 6:35 PM, Juergen Gross wrote:
>>>>> On 22/02/18 05:37, xen@xxxxxxxxxxxxxxxxxx wrote:
>>>>>> Hi.  I have a domU.  Its params file has: vcpus = 8.  It will start with
>>>>>> pv, but not type="pvh".  It will not start (on pvh) with vcpus = 7 or 6
>>>>>> or 5.  It does start with vcpus = 4.
>>>>>>
>>>>>> I diffed the xl -v create logs, no difference there on either startup.
>>>>>>
>>>>>> I grabbed the domU console output for a vcpus = 5 start (attached).  It
>>>>>> dies right after:
> 
> Dies as in crashes? Or simply gets stuck and there's no further output?
> 
>> domU console:
>>
>> [    0.001000] cpu 0 spinlock event irq 5
>> [    0.001000] Performance Events: unsupported p6 CPU model 23 no PMU 
>> driver, software events only.
>> [    0.001000] Hierarchical SRCU implementation.
>> [    0.001249] smp: Bringing up secondary CPUs ...
>> [    0.001582] installing Xen timer for CPU 1
>> [    0.001642] x86: Booting SMP configuration:
>> [    0.001653] .... node  #0, CPUs:      #1
>> [    0.003157] cpu 1 spinlock event irq 11
>> [    0.003305] installing Xen timer for CPU 2
>> [    0.003385]  #2
>> [    0.005152] cpu 2 spinlock event irq 17
>> [    0.005311] installing Xen timer for CPU 3
>> [    0.005375]  #3
>> [    0.007107] cpu 3 spinlock event irq 23
>> [    0.007341] installing Xen timer for CPU 4
> 
> Which exact kernel version is this, and can you also send the .config
> Linux kernel file?
> 
>> Xen domU params file:
>>
>> cat /home/users/ot.glenn/params 
>> kernel = "/home/users/ot.glenn/linux"
>> memory = 2000
>> swap = 128
> 
> This is not a xl option.
> 
>> name = "ot.glenn"
>> ipaddr = "72.x.x.x"
> 
> Same here.
> 
>> disk = [ 'phy:/dev/users/ot.glenn+centos6-x86_64-4.ext3,xvda1,w', 
>> 'phy:/dev/users/ot.glenn+swapfs.swp,xvda9,w' ]
>> root = "/dev/xvda1 ro"
>> restart = 'onreboot'
>> console = 50089
> 
> And here.
> 
>> type = "pvh"
>> vcpus = 5
>> vif = [ 'mac=aa:00:0b:67:50:64,bridge=br0' ]

Please add:

on_crash="preserve"

to your domain config file and after the domain crashed call:

/usr/lib/xen/bin/xenctx -C -s <kernel-with-syms> -a <domid>


Juergen

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