Comment # 25 on bug 911898 from Stanislav Brabec

According to comment 23, this bug should not appear again with sg3_utils-1.41.

Wed Jul  8 07:35:53 UTC 2015 - jthumshirn@suse.com

- Update to new upstream release 1.41
...
  * increase sanity on Unit Serial number VPD page
...

So either something went wrong or you are experiencing a different bug.

Could you provide following information on a system with sg3_utils-1.41?

syslog messages when the device is inserted

And output of following commands:
blkid
udevadm info -q property /dev/sdg
/usr/bin/sg_inq --export /dev/sdg
/usr/bin/sg_inq --verbose --page=sn --export /dev/sdg