NULL ifd for bcm port

Hi, I have two EX2300-48. running 15.1X53-D59.3 in virtualchasis,   All of my logs are full of these, there are 27  lines per second.

Dec 22 06:25:06 switch-md1 dc-pfe: BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 3 
Dec 22 06:25:06 switch-md1 fpc1 BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 0 
Dec 22 06:25:06 switch-md1 fpc0 BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 3 
Dec 22 06:25:06 switch-md1 dc-pfe: BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 3 
Dec 22 06:25:06 switch-md1 fpc1 BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 0 
Dec 22 06:25:06 switch-md1 dc-pfe: BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 3 
Dec 22 06:25:06 switch-md1 fpc0 BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 3 
Dec 22 06:25:06 switch-md1 fpc0 BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 3 
Dec 22 06:25:06 switch-md1 dc-pfe: BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 3 
Dec 22 06:25:06 switch-md1 fpc0 BRCM_SALM:brcm_salm_l2_addr_process_notif(),380: NULL ifd for bcm port = 0 ,device no = 3 

The oldest record is December 22 and I continue to receive these records, they do not stop at any time.

I searched in google and I didn't find anything about this messages. What can be a reason? Thank you!