Re: [Xen-devel] null domains | xen4.4

[Alexey <alukardd@xxxxxxxxxxxx>]

xl list two domains for example:
(null)                                      67     0     8     --pssd  
135229.6
(null)                                      69     0     4     --ps-d    
4172.2
vif67.0 still exist in my dom0 and i can't "ip link delete" it.
Attached block device marked as busy also.

We try to use the last 3.10 kernel, now new nodes use 3.10.61 kernel, 
but this node on which I can experiment was booted with 3.10.55 kernel.
I attach xl-dmesg after 'q' trigger.

We will discuss tmem with colleagues.

On 2014-12-01 12:59, Ian Campbell wrote:
> On Mon, 2014-12-01 at 12:48 +0300, Alexey wrote:
> > Hi, all!
> >
> > We are once again faced with the null-domains problem.
> > At this moment we have xen node with 49 null-domains and if I create 
> > new
> > domain and shutdown it I w'll get a new one null-domain.
> >
> > All blkback and netback kernel process are exists. There is no qemu
> > process running.
> > I can't delete any vif or stop disk, which was used by dead domain.
> What do you mean here, does a vif or disk still exist for the dead
> domain then?
>
> > How we can prevent appearance of null-domains?
> > How we can unlock resources of existing null-domains?
> A null domain remains when a page owned by that domain is still
> referenced from somewhere. The output of the 'q' debug key sometimes
> exposes the source of such references. ("xl debug-key q" will send 
> that,
> the result appears in "xl dmesg", alternatively Ctrl-A three times on
> the serial console then 'q').
>
> > # xl info
> > host                   : xen23
> > release                : 3.10-3-amd64
> Any chance you could try a newer dom0 kernel?
>
> > xen_commandline        : tmem=1 loglvl=all noreboot dom0_mem=5120M
> > dom0_vcpus_pin console=vga vga=current
> Are you able to reproduce when tmem is not enabled?
>
> Ian.

Attachment: xl-dmesg
Description: Text document

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