kmalloc-xx slab leak observed in the system due to an issue with 'falcon_lsm_pinned_xxxx' module.

Issue

• The system is going into Out of memory situation due to slab usage growth.
• The issue has been observed after upgrading the system including falcon rpm as well.

• Unreclaimable slab cache(kmalloc-xxx) usage keeps growing in the system.

  # grep ^S /proc/meminfo  | tail -3
  Slab:           57003944 kB
  SReclaimable:     630612 kB
  SUnreclaim:     56373332 kB
  
  # cat /proc/slabinfo | awk '{printf "  %6i MB %s \n",$6*$15/256,$1}' | sort -nrk1 | head
     54941 MB kmalloc-16 
       180 MB xfs_inode 
       149 MB radix_tree_node 
       116 MB buffer_head 
        90 MB proc_inode_cache 
  
  # cat /proc/slabinfo |awk '{printf "%7i MiB : %s\n",$6*$(NF-1)/256,$1}'|sort -nk 1 -r|head -5
     114092 MiB : kmalloc-64
      64526 MiB : kmalloc-16
            138 MiB : acfs_inode_cache
             95 MiB : acfs_buffer_cache_512
             87 MiB : xfs_inode