Unknown filesystem signature jmicron_raid_member in lsblk command output.

Issue

• lsblk command output shows unexpected filesystem signature jmicron_raid_member.

# lsblk --fs
    NAME                            FSTYPE              LABEL UUID                                   MOUNTPOINT
    sda                                                                                              
    ├─sda1                          ext4                      c6eb3525-d978-4ba3-bee5-4e5a3af67a74   /boot
    └─sda2                          LVM2_member               OdI3Yu-b36L-cOkH-f1Vd-WjEO-cfXj-mO1OMB 
      ├─vgroot-root (dm-0)          ext4                      f164f2b8-5844-4e3e-9b5c-bc598b0ece88   /
      ├─vgroot-swap (dm-1)          swap                      5ab592d8-9e7e-4aba-8ecb-f50f4d5ae7af   [SWAP]
      ├─vgroot-tmp (dm-9)           ext4                      9fbbf8a6-da4f-4fb6-a6bb-62b25381b3f7   /tmp
      ├─vgroot-var (dm-10)          ext4                      a825a7b7-7274-4c06-9fb6-184ccdea9f62   /var
    sdb                             LVM2_member               JVOsBh-zqFF-GTAp-XSzB-44GE-toD9-PIld2S 
      ├─testvg-datalv (dm-2)        ext4                      45f36511-616f-4c48-83b1-21ed12c77166   /data 
      ├─testvg-testlv (dm-3)        jmicron_raid_member                                              /test
      └─testvg-loglv (dm-4)         ext4                      25f29f43-b632-4b13-93c7-c50bfd8b242d   /logs   

 # blkid
/dev/sda1: UUID="c6eb3525-d978-4ba3-bee5-4e5a3af67a74" TYPE="ext4" 
/dev/sda2: UUID="OdI3Yu-b36L-cOkH-f1Vd-WjEO-cfXj-mO1OMB" TYPE="LVM2_member" 
/dev/mapper/vgroot-root: UUID="f164f2b8-5844-4e3e-9b5c-bc598b0ece88" TYPE="ext4" 
/dev/mapper/vgroot-swap: UUID="5ab592d8-9e7e-4aba-8ecb-f50f4d5ae7af" TYPE="swap" 
/dev/mapper/vgroot-tmp: UUID="9fbbf8a6-da4f-4fb6-a6bb-62b25381b3f7" TYPE="ext4" 
/dev/mapper/vgroot-var: UUID="a825a7b7-7274-4c06-9fb6-184ccdea9f62" TYPE="ext4" 
/dev/sdb: UUID="JVOsBh-zqFF-GTAp-XSzB-44GE-toD9-PIld2S" TYPE="LVM2_member" 
/dev/mapper/testvg-datalv: UUID="45f36511-616f-4c48-83b1-21ed12c77166" TYPE="ext4" 
/dev/mapper/testvg-testlv: UUID="5a1557f3-dfe8-47dd-bf77-af05412e668c" TYPE="ext4" 
/dev/mapper/testvg-loglv : UUID="25f29f43-b632-4b13-93c7-c50bfd8b242d" TYPE="ext4"