unregister_netdevice: waiting for bridge0 to become free. Usage count = 3
ref_tracker: bridge0@ffff88805d650620 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_hold include/linux/netdevice.h:4091 [inline]
     ib_device_set_netdev+0x2cb/0x6b0 drivers/infiniband/core/device.c:2216
     siw_device_create drivers/infiniband/sw/siw/siw_main.c:322 [inline]
     siw_newlink+0x425/0xe50 drivers/infiniband/sw/siw/siw_main.c:442
     nldev_newlink+0x5c2/0x640 drivers/infiniband/core/nldev.c:1795
     rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
     rdma_nl_rcv+0x6df/0x9e0 drivers/infiniband/core/netlink.c:259
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f8/0x990 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
     sock_sendmsg_nosec net/socket.c:729 [inline]
     __sock_sendmsg+0x223/0x270 net/socket.c:744
     ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2607
     ___sys_sendmsg net/socket.c:2661 [inline]
     __sys_sendmsg+0x292/0x380 net/socket.c:2690
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f