High memory consumption in `kmalloc-32`, `kmalloc-64` when use the module `airlockdriver`

Issue

• Memory was mainly consumed in SLAB

crash> kmem -i
                 PAGES        TOTAL      PERCENTAGE
    TOTAL MEM  8190373      31.2 GB         ----
         FREE   244850     956.4 MB    2% of TOTAL MEM
         USED  7945523      30.3 GB   97% of TOTAL MEM
       SHARED   266686         1 GB    3% of TOTAL MEM
      BUFFERS      520         2 MB    0% of TOTAL MEM
       CACHED   630496       2.4 GB    7% of TOTAL MEM
         SLAB  6913239      26.4 GB   84% of TOTAL MEM  <---

   TOTAL HUGE        0            0         ----
    HUGE FREE        0            0    0% of TOTAL HUGE

   TOTAL SWAP  2097151         8 GB         ----
    SWAP USED   340544       1.3 GB   16% of TOTAL SWAP
    SWAP FREE  1756607       6.7 GB   83% of TOTAL SWAP

 COMMIT LIMIT  6192337      23.6 GB         ----
    COMMITTED  1192737       4.5 GB   19% of TOTAL LIMIT

• Most SLAB was consumed in kmalloc-64 and kmalloc-32, kmalloc-16.

crash> kmem -s | awk '{print $1 "\t" $NF "\t" $2*$4/1024.0/1024.0 " MB"}' | column -t | sort -k3nr | head
ffff9270bfc07b00  kmalloc-64               12319.6    MB
ffff9270bfc07c00  kmalloc-32               12169.4    MB
ffff9270bfc07d00  kmalloc-16               2063.82    MB
ffff92775dff0600  xfs_inode                116.334    MB
ffff9270bfc05000  dentry                   68.5833    MB
ffff9270bfc06300  radix_tree_node          46.2079    MB
ffff9270bfc07400  kmalloc-2048             27.0312    MB
ffff9270bfc05500  buffer_head              24.1021    MB
ffff9270bfc04f00  inode_cache              13.0492    MB
ffff9270bfc05400  selinux_inode_security   11.4745    MB