BUG: memory leak
unreferenced object 0xffff88810c808490 (size 576):
  comm "mkdir", pid 4709, jiffies 4294939811 (age 360.720s)
  hex dump (first 32 bytes):
    00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    60 1f 5d 0c 81 88 ff ff a8 84 80 0c 81 88 ff ff  `.].............
  backtrace:
    [<ffffffff816311fe>] kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]
    [<ffffffff816311fe>] slab_post_alloc_hook mm/slab.h:766 [inline]
    [<ffffffff816311fe>] slab_alloc_node mm/slub.c:3478 [inline]
    [<ffffffff816311fe>] slab_alloc mm/slub.c:3486 [inline]
    [<ffffffff816311fe>] __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
    [<ffffffff816311fe>] kmem_cache_alloc_lru+0x2ee/0x520 mm/slub.c:3509
    [<ffffffff84b5d81f>] xas_alloc+0xef/0x110 lib/xarray.c:375
    [<ffffffff84b5f59c>] xas_expand lib/xarray.c:582 [inline]
    [<ffffffff84b5f59c>] xas_create+0x10c/0x6f0 lib/xarray.c:653
    [<ffffffff84b607eb>] xas_store+0x7b/0xad0 lib/xarray.c:787
    [<ffffffff84b61ef9>] __xa_alloc+0xe9/0x1f0 lib/xarray.c:1833
    [<ffffffff84b62073>] __xa_alloc_cyclic+0x73/0x180 lib/xarray.c:1872
    [<ffffffff816ebbb4>] xa_alloc_cyclic include/linux/xarray.h:977 [inline]
    [<ffffffff816ebbb4>] simple_offset_add+0x74/0xd0 fs/libfs.c:288
    [<ffffffff81564292>] shmem_mknod+0xf2/0x170 mm/shmem.c:3239
    [<ffffffff81564341>] shmem_mkdir+0x31/0x60 mm/shmem.c:3288
    [<ffffffff816afaea>] vfs_mkdir+0x29a/0x390 fs/namei.c:4106
    [<ffffffff816b7c10>] do_mkdirat+0x1d0/0x220 fs/namei.c:4129
    [<ffffffff816b7d99>] __do_sys_mkdir fs/namei.c:4149 [inline]
    [<ffffffff816b7d99>] __se_sys_mkdir fs/namei.c:4147 [inline]
    [<ffffffff816b7d99>] __x64_sys_mkdir+0x69/0x90 fs/namei.c:4147
    [<ffffffff84b67d8f>] do_syscall_x64 arch/x86/entry/common.c:51 [inline]
    [<ffffffff84b67d8f>] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0x6b