Unable to blacklist a disk using 'scsi:sas' blacklist entry in '/etc/multipath.conf'

Issue

• Unable to blacklist a disk using scsi:sas protocol blacklist entry in /etc/multipath.conf

• The system is having a disk connected to LSI MegaRAID Tri-Mode SAS3508 controller and scsi:sas entry is added in blacklist section, but dm-multipath still creates multipath device for it:

  $ lspci |grep "58:00.0"
  58:00.0 RAID bus controller [0104]: Broadcom / LSI MegaRAID Tri-Mode SAS3508 [1000:0016] (rev 01)
  
  $ less /etc/multipath.conf
  [...]
  blacklist {
          protocol "(scsi:adt|scsi:sbp|scsi:sas)"
  }
  
  $ multipath -ll
  mpathb (36000c2981b91daec7ba1234123456789) dm-0 Lenovo  ,RAID 930-8i-2GB
  size=500G features='0' hwhandler='0' wp=rw
  `-+- policy='service-time 0' prio=1 status=enabled
   `- 2:0:1:0 sdb 8:16 active ready running