unregister_netdevice: waiting for bridge0 to become free. Usage count = 3
ref_tracker: bridge0@ffff88805eeb8620 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_hold include/linux/netdevice.h:4091 [inline]
     netdev_hold include/linux/netdevice.h:4086 [inline]
     ib_device_set_netdev drivers/infiniband/core/device.c:2216 [inline]
     ib_device_set_netdev+0x2ec/0x850 drivers/infiniband/core/device.c:2185
     siw_device_create drivers/infiniband/sw/siw/siw_main.c:322 [inline]
     siw_newlink drivers/infiniband/sw/siw/siw_main.c:442 [inline]
     siw_newlink+0x4a3/0xe90 drivers/infiniband/sw/siw/siw_main.c:428
     nldev_newlink+0x391/0x660 drivers/infiniband/core/nldev.c:1795
     rdma_nl_rcv_msg+0x38b/0x6e0 drivers/infiniband/core/netlink.c:195
     rdma_nl_rcv_skb.constprop.0.isra.0+0x2e6/0x450 drivers/infiniband/core/netlink.c:239
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x53f/0x7f0 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1901
     sock_sendmsg_nosec net/socket.c:729 [inline]
     __sock_sendmsg net/socket.c:744 [inline]
     ____sys_sendmsg+0xab2/0xc90 net/socket.c:2607
     ___sys_sendmsg+0x135/0x1e0 net/socket.c:2661
     __sys_sendmsg+0x117/0x1f0 net/socket.c:2690
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f