[Bug 192285] New: sa(4) fails to correctly report current tape position after "mt fsf 32767"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192285

            Bug ID: 192285
           Summary: sa(4) fails to correctly report current tape position
                    after "mt fsf 32767"
           Product: Base System
           Version: 10.0-STABLE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: joerg at FreeBSD.org

When performing an "mt fsf 32767", the expectation is the driver moves
the tape to EOD, and then "mt status" reports the number of tape files
(filemarks) that have been encountered before reaching EOD.

However, it (usually) reports 32767 instead.

The bug was triggered by SVN r256843 (on HEAD, merged to 10-stable in
r260387).

See the discussion starting at:

http://docs.freebsd.org/cgi/mid.cgi?20140729090724.GA26577

for details.

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