[Bug 240775] emulators/virtualbox-ose random crashes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240775

            Bug ID: 240775
           Summary: emulators/virtualbox-ose random crashes
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: vbox at FreeBSD.org
          Reporter: 000.fbsd at quip.cz
          Assignee: vbox at FreeBSD.org
             Flags: maintainer-feedback?(vbox at FreeBSD.org)

We are using VirtualBox for a long time as headless on few machines. Some times
ago it started crashing guest running 1 - 2 weeks. No longer uptime possible.
Hosts and guest are running FreeBSD 11.3 amd64. (crashes were seen on 11.2 too
before upgrade), one guest running ubuntu-mini (crashes too)

Guest are running different services. One is busy serving Zabbix 4.0 server
(crashing more often), one is almost idle doing just IPSec gateway for other
machines in LAN.

Today 3 of 4 guests crashed almost at the same time:
on host 1 (only 1 guest running):
Sep 23 09:52:01 XXX kernel: pid 783 (VBoxHeadless), jid 0, uid 920: exited on
signal 11

on host 2 (3 guest running):
Sep 23 09:50:33 YYY kernel: pid 19569 (VBoxHeadless), jid 0, uid 920: exited on
signal 11
Sep 23 09:50:40 YYY kernel: pid 19551 (VBoxHeadless), jid 0, uid 920: exited on
signal 11

All guests has 1 CPU configured.

Am I the only one with this kind of problem?

What is the right way to debug this issue?

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