Description of problem:

The system/udev code should use VPD83 NAA ID if VPD83 TGT(type 5) not found.
Code:
        systemd/src/udev/scsi_id/scsi_id.c
            scsi_id()
        systemd/src/udev/scsi_id/scsi_serial.c
            scsi_get_serial()
                do_scsi_page83_inquiry()
                    check_fill_0x83_id()
                        static const struct scsi_id_search_values id_search_list

But got this output:
===
$ sudo sg_vpd --page 0x83  /dev/disk/by-id/wwn-0x606c03f24ee65001|grep -A1 NAA
                                                 ^^^^^^^^^^^^^^^^
    designator type: NAA,  code set: Binary
        0x50014ee603f2606c
          ^^^^^^^^^^^^^^^^
$ udevadm info -q property /dev/disk/by-id/wwn-0x606c03f24ee65001|grep ID_WWN_
ID_WWN_WITH_EXTENSION=0x606c03f24ee65001
                      ^^^^^^^^^^^^^^^^^^
===

The correct VPD83 NAA ID above is: 0x50014ee603f2606c
But          ID_WWN_WITH_EXTENSION=0x606c03f24ee65001


Version-Release number of selected component (if applicable):
RHEL-7.2-20151015.0
systemd-219-19.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Install OS on a server.
2. ls -l /dev/disk/by-id/ |grep wwn
3. sudo sg_vpd --page 0x83  /dev/disk/by-id/wwn-<WWN>|grep -A1 NAA

Actual results:
ID_WWN_WITH_EXTENSION is different from SCSI VPD83 NAA ID.

Expected results:
ID_WWN_WITH_EXTENSION use SCSI VPD83 NAA ID when VPD83 TGT ID not available.

Additional info:

Sounds like a big-endian vs little-endian issue to me.

Not sure a regression or not yet, still trying to reproduce this on other server.