[Bug 259916] kernel panic, possibly related to ciss(4)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259916

            Bug ID: 259916
           Summary: kernel panic, possibly related to ciss(4)
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: fuz@fuz.su

Created attachment 229574
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=229574&action=edit
crash information

After trying to debug a wonky tape drive that would randomly disconnect itself
for some reason,
my FreeBSD 13.0-RELEASE-p4 server crashed with a kernel panic.  The tape drive
is attached to
a SAS controller supported by the ciss(4) driver.  The last commands I executed
before the crash
were:

    camcontrol rescan all # necessary to make the tape drive come back online
    mt rewind && mt offline

See attached files for some information about the crash.  I do have a core dump
and can run
further analysis on it if requested.

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