[Bug 223381] mpt driver hangs with iscsi devices and scsi drives defined in VBOX FBSD guest

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223381

            Bug ID: 223381
           Summary: mpt driver hangs with iscsi devices and scsi drives
                    defined in VBOX FBSD guest
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: randomnoise058 at gmail.com

iSCSI Reference bug report: id=223238

VirtualBox (VBOX) guest system: FBSD-11.1-Release, Oct 25 2017
Host system: FBSD-9.3-STABLE
iSCSI server: Synology d216+II SAN/NAS delivering multiple targets and multiple
LUNs to guest system.

Reference attachments from above bug report:
https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187481
https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187624

Problem description:

With (VBOX) SCSI drives (LSIlogic/BUSlogic) combined with iSCSI targets, there
comes a time when the guest system locks up as shown in attachment 187481
screen shot. The other attachement shows the FBSD VBOX storage assigments
during the problem event. This problem is repetitive.

Temporary solution: remove VBOX SCSI drives.

Note that I am not able to test this on a physical FBSD system at this time.

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