unregister_netdevice: waiting for lo to become free. Usage count = 2
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4051 [inline]
 netdev_hold include/linux/netdevice.h:4080 [inline]
 inetdev_init+0x1dc/0x4a0 net/ipv4/devinet.c:275
 inetdev_event+0xf04/0x12d8 net/ipv4/devinet.c:1547
 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:2014 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline]
 call_netdevice_notifiers+0x110/0x198 net/core/dev.c:2066
 register_netdevice+0x11a8/0x160c net/core/dev.c:10250
 register_netdev+0x48/0x64 net/core/dev.c:10345
 loopback_net_init+0x64/0x150 drivers/net/loopback.c:220
 ops_init+0x2b0/0x53c net/core/net_namespace.c:138
 setup_net+0x474/0xb34 net/core/net_namespace.c:336
 copy_net_ns+0x2b8/0x578 net/core/net_namespace.c:508
 create_new_namespaces+0x318/0x5ec kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x108/0x158 kernel/nsproxy.c:226
 ksys_unshare+0x3e0/0x6dc kernel/fork.c:3282
 __do_sys_unshare kernel/fork.c:3353 [inline]
 __se_sys_unshare kernel/fork.c:3351 [inline]
 __arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3351
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140