unregister_netdevice: waiting for blkio.throttle. to become free. Usage count = 2
ref_tracker: blkio.throttle.@ffff888075cf8610 has 1/1 users at
     dev_ifsioc+0x93b/0xba0 net/core/dev_ioctl.c:590
     dev_ioctl+0x508/0xf80 net/core/dev_ioctl.c:787
     sock_do_ioctl+0x238/0x460 net/socket.c:1236
     sock_ioctl+0x4ca/0x7e0 net/socket.c:1341
     vfs_ioctl fs/ioctl.c:51 [inline]
     __do_sys_ioctl fs/ioctl.c:871 [inline]
     __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0x81/0x180 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x63/0x6b