[Bug 213019] Virtual Box 5.1.6 (110634) shut down hang

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213019

            Bug ID: 213019
           Summary: Virtual Box 5.1.6 (110634) shut down hang
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: tony01 at rochester.rr.com

a VM such as windows or ubuntu that has a graphical desktop will not terminate
the process using the power button inside the VM.

If the VM does not have a graphical desktop suck as ubuntu server then it will
shutdown from a terminal inside the VM fine.

it seems the issue is with VNC. attached is a portion of a trace.

Thread 1 (LWP 100934 of process 2646):
#0  0x000000080083913c in ?? () from /lib/libthr.so.3
#1  0x000000080082f246 in ?? () from /lib/libthr.so.3
#2  0x000000080083759e in ?? () from /lib/libthr.so.3
#3  0x0000000807546d6b in rfbClientConnectionGone () from
/usr/local/lib/libvncserver.so.0
#4  0x0000000807545b70 in rfbShutdownServer () from
/usr/local/lib/libvncserver.so.0
#5  0x0000000807335f77 in ?? () from
/usr/local/lib/virtualbox/ExtensionPacks/VNC/freebsd.amd64/VBoxVNC.so
#6  0x00000008060e0ebd in ConsoleVRDPServer::Stop (this=0x801e09400)
    at
/usr/ports/emulators/virtualbox-ose/work/VirtualBox-5.1.6/src/VBox/Main/src-client/ConsoleVRDPServer.cpp:3015
#7  0x00000008060864b2 in Console::i_powerDown (this=0x801d14c00,
aProgress=0x810032f20)
    at
/usr/ports/emulators/virtualbox-ose/work/VirtualBox-5.1.6/src/VBox/Main/src-client/ConsoleImpl.cpp:7632
#8  0x00000008060a95f7 in Console::i_powerDownThreadTask (pTask=0x810033100)
    at
/usr/ports/emulators/virtualbox-ose/work/VirtualBox-5.1.6/src/VBox/Main/src-client/ConsoleImpl.cpp:10054
#9  0x000000080606d7bc in ThreadTask::taskHandlerThreadProc
(pvUser=0x810033100)
    at
/usr/ports/emulators/virtualbox-ose/work/VirtualBox-5.1.6/src/VBox/Main/src-all/ThreadTask.cpp:123
---Type <return> to continue, or q <return> to quit---
#10 0x00000008020fe1cc in rtThreadMain (pThread=0x801c2b000,
NativeThread=<optimized out>, pszThreadName=0x0)
    at
/usr/ports/emulators/virtualbox-ose/work/VirtualBox-5.1.6/src/VBox/Runtime/common/misc/thread.cpp:717
#11 0x000000080217ae2e in rtThreadNativeMain (pvArgs=0x801c2b000)
    at
/usr/ports/emulators/virtualbox-ose/work/VirtualBox-5.1.6/src/VBox/Runtime/r3/posix/thread-posix.cpp:327
#12 0x000000080082d855 in ?? () from /lib/libthr.so.3
#13 0x0000000000000000 in ?? ()

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