VirtualBox VM hangs on shutdown / stopping [SOLVED] - VNC problem

[Miroslav Lachman]

Derek Schrock wrote on 2017/12/11 00:27:
> On Sat, Dec 09, 2017 at 05:49:57PM EST, Miroslav Lachman wrote:
>> I did a fresh installation on FreeBSD 10.4-RELEASE-p5 amd64 GENERIC.
>>
>> Whenever I need to stop the VM it hangs indefinitely. The OS in VM is
>> also FreeBSD 10.4-p5 amd64. Virtual machine runs fine, but if is use
>> shutdown -r now, shutdown -p now (in VM) or use ACPI PowerOff in
>> phpVirtualBox or VBoxManage it always hangs after OS in VM is completely
>> down (buffers synced etc.)
>>
>> Packages used:
>>     virtualbox-ose-kmod-5.2.0_1
>>     virtualbox-ose-nox11-5.2.0_1
>>
>> Built with Options        :
>>           PYTHON         : off
>>           R0LOGGING      : off
>>           UDPTUNNEL      : on
>>           VDE            : on
>>           VNC            : on
>>           WEBSERVICE     : on
>>
>>
>>     The process is still running:
>>
>> # ps auxww | grep FBSD_104_tpl
>> vboxusers 1268   0.0  5.3 1062960 891668  -  I    11:30PM   0:32.43
>> /usr/local/lib/virtualbox/VBoxHeadless --comment FBSD_104_tpl --startvm
>> ba50a283-41fa-48ae-8ff2-87591c50bfed --vrde config
>>
>> # VBoxManage list vms
>> "FBSD_104_tpl" {ba50a283-41fa-48ae-8ff2-87591c50bfed}
>>
>>      but no running VMs listed by VBoxManage
>>
>> # VBoxManage list runningvms
>>
>> # VBoxManage controlvm "FBSD_104_tpl" poweroff
>> VBoxManage: error: The virtual machine is being powered down
>> VBoxManage: error: Details: code VBOX_E_INVALID_VM_STATE (0x80bb0002),
>> component ConsoleWrap, interface IConsole, callee nsISupports
>> VBoxManage: error: Context: "PowerDown(progress.asOutParam())" at line
>> 578 of file VBoxManageControlVM.cpp
>>
>> The above is the second try to stop VM after few minutes of waiting on
>> "Stopping" in phpVirtualBox.
>>
>> It must be killed by "kill PID", then I can run the VM again.
>> (phpVirtualBox says "Aborted")
>>
>>
>> Can anybody help me to debug and fix this issues?
>>
>> I never see this problem on different machines with slightly older
>> version of VirtualBox. We are using the same setup for years.

> What are the chances that you're VNC'ed to the VM during shutdown?  I've
> yet to gather all the parts but there is a bug in libvncserver/vbox that
> fails to allow a VM to quit if the VNC session isn't closed before the
> the VM is shutdown.

Thank you! You saved me a lot of time.
Yes, this is the problem. When VNC is connected, the VM cannot be shut 
down. If I disconnect VNC then shutdown works fine.
It is really annoying bug but at least I know a workaround now.
Thank you.

Do you know if this bug is reported somewhere?

Kind Regards
Miroslav Lachman