unregister_netdevice: waiting for syzkaller0 to become free. Usage count = 2
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4051 [inline]
 netdev_tracker_alloc include/linux/netdevice.h:4063 [inline]
 fib6_nh_init+0x630/0x1ad4 net/ipv6/route.c:3665
 ip6_route_info_create+0x7b0/0xf78 net/ipv6/route.c:3846
 addrconf_f6i_alloc+0x1a8/0x36c net/ipv6/route.c:4621
 ipv6_add_addr+0x3c8/0xce0 net/ipv6/addrconf.c:1121
 addrconf_add_linklocal+0x23c/0x608 net/ipv6/addrconf.c:3257
 addrconf_addr_gen+0x3ec/0x4fc net/ipv6/addrconf.c:3388
 addrconf_init_auto_addrs+0x5e0/0x94c net/ipv6/addrconf.c:-1
 addrconf_notify+0x8c4/0xc8c net/ipv6/addrconf.c:3685
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:2001 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 __dev_notify_flags+0x250/0x480 net/core/dev.c:8676
 dev_change_flags+0xc8/0x154 net/core/dev.c:8714
 dev_ifsioc+0x138/0xc04 net/core/dev_ioctl.c:326
 dev_ioctl+0x4b0/0xc74 net/core/dev_ioctl.c:572
 sock_do_ioctl+0x198/0x258 net/socket.c:1215
 sock_ioctl+0x238/0x824 net/socket.c:1320
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856