[Bug 200904] crash in scif_cb_domain_device_removed when disk goes away

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200904

            Bug ID: 200904
           Summary: crash in scif_cb_domain_device_removed when disk goes
                    away
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: allanjude at FreeBSD.org

Created attachment 157803
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=157803&action=edit
Screenshot of panic

I've now seen this crash twice in a week

One of the disks on my isci(4) controller is going bad, and sometimes hangs and
times out on the controller.

When this happens, and the controller goes to remove the device, it panics the
system.

I wasn't able to use the debugger prompt because I had to reset the IPMI
interface to get it to let me connect, so lost the USB keyboard.

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