unregister_netdevice: waiting for syzkaller1 to become free. Usage count = 2
ref_tracker: netdev@00000000e4333f87 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4483 [inline]
     netdev_get_by_index+0x88/0xe0 net/core/dev.c:1027
     fib6_nh_init+0x258/0x14bc net/ipv6/route.c:3606
     ip6_route_info_create_nh+0x120/0x9a8 net/ipv6/route.c:3905
     addrconf_f6i_alloc+0x1e4/0x3b4 net/ipv6/route.c:4697
     ipv6_add_addr+0x458/0xd70 net/ipv6/addrconf.c:1126
     addrconf_add_linklocal+0x1e0/0x378 net/ipv6/addrconf.c:3311
     addrconf_addr_gen+0x27c/0x2e0 net/ipv6/addrconf.c:-1
     addrconf_init_auto_addrs+0x390/0x764 net/ipv6/addrconf.c:-1
     addrconf_notify+0x7a0/0xbe4 net/ipv6/addrconf.c:3752
     notifier_call_chain+0x194/0x60c kernel/notifier.c:85
     raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
     call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2249
     call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
     call_netdevice_notifiers net/core/dev.c:2301 [inline]
     __dev_notify_flags+0x160/0x27c net/core/dev.c:9794
     netif_change_flags+0xd0/0x15c net/core/dev.c:9823
     dev_change_flags+0x10c/0x204 net/core/dev_api.c:68
     devinet_ioctl+0x7d0/0x15bc net/ipv4/devinet.c:1199