Re: [Xen-devel] Trying out vixen: qemu processes left behind

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

On Thu, Jan 11, 2018 at 3:00 PM, Andy Smith <andy@xxxxxxxxxxxxxx> wrote:
> Hi,
>
> I'm giving Vixen a try by following the instructions in
> https://xenbits.xen.org/xsa/xsa254/README.vixen
>
> Debian jessie, xen 4.8.1 packages from jessie-backports with XSAs
> applied.
>
> I finally got a guest booted although its networking doesn't work.
> Every time I've started a guest and had it crash it's left behind a
> domain called "(null)" and a matching qemu process so I assume
> that's the device model. I thought that was just because the guest
> was failing to start.
>
> Now that I have one which boots, even when I shut it down cleanly
> there's still a domain left behind:
>
> $ sudo xl list
> Name                                        ID   Mem VCPUs      State   
> Time(s)
> Domain-0                                     0  2048     2     r-----  
> 104114.0
> (null)                                      17     1     2     --ps-d      
> 14.2
> $ ps awux | grep qemu
> root      3310  1.2  1.2 430648 24676 ?        SLl  22:48   0:06 
> /usr/local/lib/xen/bin/qemu-system-i386 -xen-domid 17 -chardev 
> socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-17,server,nowait -no-shutdown 
> -mon chardev=libxl-cmd,mode=control -chardev 
> socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-17,server,nowait 
> -mon chardev=libxenstat-cmd,mode=control -nodefaults -no-user-config -name 
> debtest1 -display none -serial pty -boot order=c -smp 2,maxcpus=2 -netdev 
> type=tap,id=net0,ifname=vif17.0-emu,script=no,downscript=no -machine xenfv 
> -cdrom /var/lib/xen/pvshim-sidecars/debtest1.iso -m 2552
>
> If I kill the qemu process then the domain does away.
>
> Is this expected? It doesn't seem workable if so.

Usually this means there is a dangling backend that wasn't properly
terminated.  It would be useful to xenstore-ls the domain and see
which backend is not in a disconnected state.

Regards,

Anthony Liguori

> Cheers,
> Andy
>
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