On Fri, 27 Mar 2015, Warren Block wrote:

On Fri, 27 Mar 2015, Ivo Karabojkov wrote:

I usually use VirtualBox with VNC and webservice on headless servers.
I noticed that after any update if the VMs are not turned off but with
saved state the new version of VirtualBox is unable to start them and
the process terminates with an error. To start the VMs you should
discard their states by running (as vboxusers if this is the user who
runs VirtualBox services):

VBoxManage discardstate <vmname>

This is always necesarry in my case after almost any update of VirtualBox

My VMs were all shut down before the upgrade.

At this point, I have tried multiple versions of the operating system, rebuilding everything VirtualBox depends on, removing CPUTYPE from make.conf, and twm rather than xfce. The problem has not changed, though.

A diff between the truss output of a failed session of 'VBoxManage list vms' and a working one shows that the problems start here:

  connect(5,{ AF_UNIX "/tmp/.vbox-wblock-ipc/ipcd" },106) ERR#61 'Connection 
refused'

When the command works:

  connect(5,{ AF_UNIX "/tmp/.vbox-wblock-ipc/ipcd" },106) = 0 (0x0)

In a new terminal window, 'VBoxManage list vms' fails the first three times, then works. After that, it usually works again in that same terminal. It still can't start a VM.
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