[Bug 226671] sa driver error on close

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226671

            Bug ID: 226671
           Summary: sa driver error on close
           Product: Base System
           Version: 10.4-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bugReporter at ib-haakh.de

I upgrading the kernel to r330489 and added:

options MAXPHYS=(1024*1024)
options DFLTPHYS=(1024*1024)

Since then, the following error occured:

echo "gtar -v -c -b 128 -F /root/select_tape -f /dev/nsa0 --sort=name -C
/mmed/.zfs/snapshot/backup_2018-03-15 ./" |at -q A now

The log-file from at contains:
./
./Audio/
[...] Much stuff omitted
./Video/DVDs/Cary Grant/HOUSEBOAT.ISO
/usr/local/bin/gtar: /dev/nsa0: Funktion close fehlgeschlagen: Input/output
error
2018-03-15 21:06:41 Backup for ... mit gtar-opt -b 128
2018-03-15 21:06:41 Inserting TAR_VOLUME: 2
2018-03-15 21:06:41 Unloading tape: <000112L5:0> to   slot 7
2018-03-15 21:08:41 Loading tape:   <000113L5:0> from slot 8
2018-03-15 21:09:20 Resuming backup!
/usr/local/bin/gtar: /dev/nsa0: Funktion write fehlgeschlagen: Operation not
permitted
/usr/local/bin/gtar: Error is not recoverable: exiting now

The kernel is:
[ah at tmaster ~]$ uname -a
FreeBSD tmaster 10.4-STABLE FreeBSD 10.4-STABLE #0 r330489: Tue Mar  6 19:11:47
CET 2018 toor at tmaster:/usr/obj/usr/src/sys/TMASTER amd64
[ah at tmaster ~]$

The select_tape script returns the current tape from the drive to the library,
loads the next one into the drive and returns.

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