BUG: memory leak
unreferenced object 0xffff8881178734e0 (size 32):
  comm "syz-executor166", pid 6862, jiffies 4294945074 (age 14.130s)
  hex dump (first 32 bytes):
    73 69 74 32 00 74 61 73 6b 2f 36 38 36 32 00 00  sit2.task/6862..
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000484b95d9>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000484b95d9>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000484b95d9>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000484b95d9>] __do_kmalloc mm/slab.c:3653 [inline]
    [<00000000484b95d9>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3670
    [<00000000722b5ab2>] kstrdup+0x3a/0x70 mm/util.c:60
    [<000000001b7f8d6a>] kstrdup_const+0x48/0x60 mm/util.c:82
    [<0000000094c4e099>] kvasprintf_const+0x7e/0xe0 lib/kasprintf.c:48
    [<000000000cf6dd52>] kobject_set_name_vargs+0x40/0xe0 lib/kobject.c:289
    [<00000000bfb8d07f>] dev_set_name+0x63/0x90 drivers/base/core.c:2006
    [<00000000f4544839>] netdev_register_kobject+0x5a/0x1b0 net/core/net-sysfs.c:1727
    [<000000006fccf9b4>] register_netdevice+0x397/0x610 net/core/dev.c:9086
    [<00000000bf4cb500>] ipip6_tunnel_create+0x7c/0xd0 net/ipv6/sit.c:208
    [<00000000220b6f88>] ipip6_newlink+0xb1/0x170 net/ipv6/sit.c:1589
    [<000000008c6514ed>] __rtnl_newlink+0x892/0xb30 net/core/rtnetlink.c:3197
    [<0000000057aefa55>] rtnl_newlink+0x4e/0x80 net/core/rtnetlink.c:3255
    [<00000000203351f7>] rtnetlink_rcv_msg+0x178/0x4b0 net/core/rtnetlink.c:5224
    [<00000000a5312f64>] netlink_rcv_skb+0x61/0x170 net/netlink/af_netlink.c:2477
    [<0000000026ba79dd>] rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5242
    [<000000009bf05c0a>] netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
    [<000000009bf05c0a>] netlink_unicast+0x1ec/0x2d0 net/netlink/af_netlink.c:1328