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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Jan 12, 2018 at 01:56:17AM +0000, Andy Smith wrote:
> Hi Anthony,
> 
> On Thu, Jan 11, 2018 at 03:47:25PM -0800, Anthony Liguori wrote:
> > On Thu, Jan 11, 2018 at 3:00 PM, Andy Smith <andy@xxxxxxxxxxxxxx> wrote:
> > > $ 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.
> 
> After halting that:
> 
> $ sudo xl list
> Name                                        ID   Mem VCPUs      State   
> Time(s)
> Domain-0                                     0  2048     2     r-----  
> 104246.6
> (null)                                      19     1     2     --ps-d      
> 86.6
> $ sudo xenstore-ls
> tool = ""
>  xenstored = ""
> local = ""
>  domain = ""
>   0 = ""
>    control = ""
>     feature-poweroff = "1"
>     feature-reboot = "1"
>     feature-suspend = "1"
>    domid = "0"
>    name = "Domain-0"
>    device-model = ""
> vm = ""
> libxl = ""
> $ sudo xenstore-ls /local/domain/19
> xenstore-ls: xs_directory (/local/domain/19): No such file or directory
> 

There is a bug in the dm wrapper that would cause QEMU to become
orphaned. An updated version will be provided.

Wei.

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