unregister_netdevice: waiting for syzkaller1 to become free. Usage count = 2
ref_tracker: syzkaller1@ffff8880326a4618 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4148 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4160 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:897
     fib6_nh_init+0x1d8/0x2160 net/ipv6/route.c:3531
     ip6_route_info_create+0x9c8/0x12c0 net/ipv6/route.c:3799
     addrconf_f6i_alloc+0x3c2/0x7f0 net/ipv6/route.c:4572
     ipv6_add_addr+0x5b6/0x1090 net/ipv6/addrconf.c:1131
     addrconf_add_linklocal+0x368/0xa20 net/ipv6/addrconf.c:3271
     addrconf_addr_gen+0x510/0xbb0
     addrconf_dev_config net/ipv6/addrconf.c:3447 [inline]
     addrconf_init_auto_addrs+0x96a/0xeb0 net/ipv6/addrconf.c:3525
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3698
     notifier_call_chain+0x18f/0x3b0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8725
     devinet_ioctl+0xab8/0x1bc0 net/ipv4/devinet.c:1167
     inet_ioctl+0x3d7/0x4f0 net/ipv4/af_inet.c:1000
     sock_do_ioctl+0x158/0x460 net/socket.c:1222
     sock_ioctl+0x629/0x8e0 net/socket.c:1341