[Bug 236917] emulators/virtualbox-ose: Sleeping thread owns a non-sleepable lock kernel panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236917

--- Comment #1 from Derek Schrock <dereks at lifeofadishwasher.com> ---
Created attachment 203654
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=203654&action=edit
Three set of panic backtraces

After upgrading to virtualbox-ose-5.2.26_4 today three panics in a row with
mildly different backtraces.  Disabling vboxheadless and starting vboxheadless
by hand did not panic the machine.

All panics were "Sleeping thread (tid X, pid Y) owns a non-sleepable lock"
All referencing VBoxDrvFreeBSDIOCtl and rtR0SemEventWait

Should this be reported to upsteam?

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