unregister_netdevice: waiting for syz_tun to become free. Usage count = 3
ref_tracker: netdev@ffff888055b1c700 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4496 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4508 [inline]
     netdev_get_by_index+0x79/0xb0 net/core/dev.c:1027
     fib6_nh_init+0x285/0x1e40 net/ipv6/route.c:3615
     ip6_route_info_create_nh+0x16a/0xad0 net/ipv6/route.c:3914
     addrconf_f6i_alloc+0x3b7/0x630 net/ipv6/route.c:4706
     ipv6_add_addr+0x59c/0x1110 net/ipv6/addrconf.c:1132
     inet6_addr_add+0x43c/0xb50 net/ipv6/addrconf.c:3073
     inet6_rtm_newaddr+0x9f3/0xdf0 net/ipv6/addrconf.c:5094
     rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7076
     netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
     sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775
     __sock_sendmsg net/socket.c:790 [inline]
     __sys_sendto+0x408/0x5a0 net/socket.c:2252
     __do_compat_sys_socketcall net/compat.c:-1 [inline]
     __se_compat_sys_socketcall net/compat.c:422 [inline]
     __ia32_compat_sys_socketcall+0x44f/0xa50 net/compat.c:422
     do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
     do_int80_emulation+0x19a/0x550 arch/x86/entry/syscall_32.c:172
     asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:598

ref_tracker: netdev@ffff888055b1c700 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4496 [inline]
     netdev_hold include/linux/netdevice.h:4525 [inline]
     ipv6_add_dev+0x50f/0x13a0 net/ipv6/addrconf.c:411
     addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3685
     notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     register_netdevice+0x18a4/0x1eb0 net/core/dev.c:11484
     tun_set_iff+0x814/0xec0 drivers/net/tun.c:2813
     __tun_chr_ioctl+0x7bb/0x1e10 drivers/net/tun.c:3094
     __do_compat_sys_ioctl fs/ioctl.c:695 [inline]
     __se_compat_sys_ioctl fs/ioctl.c:638 [inline]
     __ia32_compat_sys_ioctl+0x5ea/0x950 fs/ioctl.c:638
     do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
     __do_fast_syscall_32+0x23e/0x6f0 arch/x86/entry/syscall_32.c:307
     do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
     entry_SYSENTER_compat_after_hwframe+0x84/0x8e