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+0x620/0x19cc net/ipv6/route.c:3665
 ip6_route_info_create+0x7b0/0xf7c net/ipv6/route.c:3846
 addrconf_f6i_alloc+0x188/0x330 net/ipv6/route.c:4621
 ipv6_add_addr+0x3b4/0xccc net/ipv6/addrconf.c:1121
 addrconf_add_linklocal+0x22c/0x5d0 net/ipv6/addrconf.c:3258
 addrconf_addr_gen+0x3b4/0x4a8 net/ipv6/addrconf.c:3389
 addrconf_init_auto_addrs+0x5a8/0x994 net/ipv6/addrconf.c:-1
 addrconf_notify+0x8dc/0xca8 net/ipv6/addrconf.c:3691
 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+0x250/0x46c net/core/dev.c:-1
 dev_change_flags+0xc8/0x154 net/core/dev.c:8702
 dev_ifsioc+0x524/0xed0 net/core/dev_ioctl.c:327
 dev_ioctl+0x4c8/0xc8c net/core/dev_ioctl.c:588
 sock_do_ioctl+0x18c/0x240 net/socket.c:1218
 sock_ioctl+0x5c4/0x840 net/socket.c:1321
 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