e list of known hosts.
executing program
BUG: memory leak
unreferenced object 0xffff8881154fc400 (size 128):
  comm "syz-executor633", pid 7053, jiffies 4294942670 (age 7.960s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000f75a746c>] kmemleak_alloc_recursive include/linux/kmemleak.h:55 [inline]
    [<00000000f75a746c>] slab_post_alloc_hook mm/slab.h:439 [inline]
    [<00000000f75a746c>] slab_alloc mm/slab.c:3326 [inline]
    [<00000000f75a746c>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
    [<00000000c8c2cfee>] kmalloc include/linux/slab.h:547 [inline]
    [<00000000c8c2cfee>] kzalloc include/linux/slab.h:742 [inline]
    [<00000000c8c2cfee>] fanout_add net/packet/af_packet.c:1653 [inline]
    [<00000000c8c2cfee>] packet_setsockopt+0xcad/0x1160 net/packet/af_packet.c:3811
    [<00000000378a346c>] __sys_setsockopt+0x98/0x120 net/socket.c:2072
    [<000000000f9ca17f>] __do_sys_setsockopt net/socket.c:2083 [inline]
    [<000000000f9ca17f>] __se_sys_setsockopt net/socket.c:2080 [inline]
    [<000000000f9ca17f>] __x64_sys_setsockopt+0x26/0x30 net/socket.c:2080
    [<000000003debe27f>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301
    [<0000000020f89c0b>] entry_SYSCALL_64_after_hwframe+0x44/0xa9