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Date:      Sat, 2 Jun 2012 13:16:41 -0400
From:      Steve Tuts <yiz5hwi@gmail.com>
To:        freebsd-emulation@freebsd.org
Subject:   one virtualbox vm disrupts all vms and entire network
Message-ID:  <CAEXKtDreCQ0O4NAi5opGm_KnR4As=dDvc-zP5Z0z5g84GQQuyg@mail.gmail.com>

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Hi, we have a Dell poweredge server with a dozen interfaces.  It hosts a
few guests of web app and email servers with VirtualBox-4.0.14.  The host
and all guests are FreeBSD 9.0 64bit.  Each guest is bridged to a distinct
interface.  The host and all guests are set to 10.0.0.0 network NAT'ed to a
cicso router.

This runs well for a couple months, until we added a new guest recently.
Every few hours, none of the guests can be connected.  We can only connect
to the host from outside the router.  We can also go to the console of the
guests (except the new guest), but from there we can't ping the gateway
10.0.0.1 any more.  The new guest just froze.

Furthermore, on the host we can see a vboxheadless process for each guest,
including the new guest.  But we can not kill it, not even with "kill -9".
We looked around the web and someone suggested we should use "kill
-SIGCONT" first since the "ps" output has the "T" flag for that
vboxheadless process for that new guest, but that doesn't help.  We also
tried all the VBoxManager commands to poweroff/reset etc that new guest,
but they all failed complaining that vm is in Aborted state.  We also tried
VBoxManager commands to disconnect the network cable for that new guest, it
didn't complain, but there was no effect.

For a couple times, on the host we disabled the interface bridging that new
guest, then that vboxheadless process for that new guest disappeared (we
attempted to kill it before that).  And immediately all other vms regained
connection back to normal.

But there is one time even the above didn't help - the vboxheadless process
for that new guest stubbonly remains, and we had to reboot the host.

This is already a production server, so we can't upgrade virtualbox to the
latest version until we obtain a test server.

Would you advise:

1. is there any other way to kill that new guest instead of rebooting?
2. what might cause the problem?
3. what setting and test I can do to analyze this problem?



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