e list of known hosts.
executing program
BUG: memory leak
unreferenced object 0xffff88811d8c1600 (size 128):
  comm "syz-executor237", pid 7136, jiffies 4294943337 (age 8.090s)
  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:
    [<000000002dee2c6a>] kmemleak_alloc_recursive include/linux/kmemleak.h:55 [inline]
    [<000000002dee2c6a>] slab_post_alloc_hook mm/slab.h:439 [inline]
    [<000000002dee2c6a>] slab_alloc mm/slab.c:3326 [inline]
    [<000000002dee2c6a>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
    [<000000007395adc4>] kmalloc include/linux/slab.h:547 [inline]
    [<000000007395adc4>] kzalloc include/linux/slab.h:742 [inline]
    [<000000007395adc4>] fanout_add net/packet/af_packet.c:1659 [inline]
    [<000000007395adc4>] packet_setsockopt+0xcad/0x1160 net/packet/af_packet.c:3817
    [<00000000955e34a8>] __sys_setsockopt+0x98/0x120 net/socket.c:2078
    [<0000000040c08840>] __do_sys_setsockopt net/socket.c:2089 [inline]
    [<0000000040c08840>] __se_sys_setsockopt net/socket.c:2086 [inline]
    [<0000000040c08840>] __x64_sys_setsockopt+0x26/0x30 net/socket.c:2086
    [<00000000286ecd84>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301
    [<00000000ed17b975>] entry_SYSCALL_64_after_hwframe+0x44/0xa9