unregister_netdevice: waiting for syzkaller0 to become free. Usage count = 2
ref_tracker: netdev@ffff8880346d4658 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4470 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4482 [inline]
     netdev_get_by_index+0x79/0xb0 net/core/dev.c:1027
     fib6_nh_init+0x285/0x1e30 net/ipv6/route.c:3610
     ip6_route_info_create_nh+0x16a/0xad0 net/ipv6/route.c:3909
     addrconf_f6i_alloc+0x3b7/0x630 net/ipv6/route.c:4701
     ipv6_add_addr+0x59c/0x1100 net/ipv6/addrconf.c:1126
     addrconf_add_linklocal+0x20c/0x460 net/ipv6/addrconf.c:3311
     addrconf_addr_gen+0x2f8/0x360 net/ipv6/addrconf.c:3447
     addrconf_notify+0xb1e/0x1050 net/ipv6/addrconf.c:3752
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
     call_netdevice_notifiers net/core/dev.c:2301 [inline]
     __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9794
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9823
     dev_change_flags+0x130/0x270 net/core/dev_api.c:68
     dev_ioctl+0x7b4/0x1150 net/core/dev_ioctl.c:816
     sock_do_ioctl+0x23e/0x320 net/socket.c:1327
     sock_ioctl+0x5c6/0x7f0 net/socket.c:1434
     vfs_ioctl fs/ioctl.c:51 [inline]
     __do_sys_ioctl fs/ioctl.c:597 [inline]
     __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583