I've got a couple win7 clients under virtualbox on sabayon hosts. Seems there's an error in vbox that's re-appeared where the shared folders (from the host) disappear if you put much I/O stress on copying/moving/etc files/folders from the shares. The problem is described in the ticket below:
So, basically, to get around that, I've masked out the newer (>5.0.20-r1) from being installed. 5.0.20 works just fine, and doesn't present that error. I masked them like so:
In file /etc/entropy/packages/package.mask I added the following entries (I'm running a 4.6 kernel, but other kernels don't fix the problem, I've tried different versions without fixing the underlying vbox problem).
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# 2016-10-10 mask newer virtualbox until share freeze issue fixed -- Ticket #15662
Install the matching virtualbox-modules and guest-additions for your kernel, and the older (I fortunately kept my files, perhaps this could be added back to the repositories until the ticket is fixed??) virtualbox-bin and all should be ok.
Like so (for the version I had a file still in the packages downloaded):
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equo install /var/lib/entropy/client/packages/packages-nonfree/amd64/5/app-emulation/app-emulation:virtualbox-bin-126.96.36.199931.3eb163127b7b45ad7376fb4802e4ee3b7d48e186~0.tbz2
equo install app-emulation/virtualbox-modules-5.0.20#4.6.0-sabayon app-emulation/virtualbox-guest-additions-5.0.20#4.6.0-sabayon
Hope that helps anyone dealing with similar issues, it's been working for me so far!
EDIT, More details from vbox ticket in case these help.
From VirtualBox Ticket #15662 which very closely matches my experience including windows 7 client, etc; different software project of course:
I have a Windows 7 development box for my main project. I use shared folders to build the release executable (Delphi code, Git, Finalbuilder to create the installation package).
When I start the build under VBox 5.1.2, at a point in time, something freeze. The shared folders seems "disconnected" (visible from the windows explorer but not browseable anymore). And I can't shutdown the guest OS. Have to kill it from VirtualBox Manager GUI (or by clicking the "close" button)
Host is Windows 10 1607 v14388.0 Guest is Windows 7 Pro (updates applied)
With VirtualBox 5.0.26 (and below) it works. With VirtualBox 5.1.2 it fails even with Guest Additions 5.0.26.