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Subject: Re: unregister_netdevice: waiting for DEV to become free (2)
To:     syzbot <syzbot+30209ea299c09d8785c9@syzkaller.appspotmail.com>,
        YueHaibing <yuehaibing@huawei.com>,
        Jouni Hogander <jouni.hogander@unikie.com>
Cc:     Julian Anastasov <ja@ssi.bg>, ddstreet@ieee.org,
        dvyukov@google.com, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com,
        Hulk Robot <hulkci@huawei.com>,
        "David S. Miller" <davem@davemloft.net>,
        Lukas Bulwahn <lukas.bulwahn@gmail.com>
References: <0000000000007d22100573d66078@google.com>
 <alpine.LFD.2.20.1808201527230.2758@ja.home.ssi.bg>
From:   Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Message-ID: <ace19af4-7cae-babd-bac5-cd3505dcd874@I-love.SAKURA.ne.jp>
Date:   Thu, 28 Nov 2019 18:56:21 +0900
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Hello people involved in commit a3e23f719f5c4a38 ("net-sysfs: call dev_hold if kobject_init_and_add success")
and commit b8eb718348b8fb30 ("net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject").

syzbot is reporting that unregister_netdevice() hangs due to underflowing
device refcount when kobject_init_and_add() failed due to -ENOMEM.

----------
11:25:02 executing program 3 (fault-call:5 fault-nth:2):
r0 = openat$tun(0xffffffffffffff9c, &(0x7f0000000100)='/dev/net/tun\x00', 0x0, 0x0)
ioctl$TUNSETIFF(r0, 0x400454ca, &(0x7f0000000000)={'vet\x00\x00\x00\x00\x00\x00\x00\x00\x00\xbdh\x00', 0x43732e5398416f1a})
ioctl$TUNSETQUEUE(r0, 0x400454d9, &(0x7f00000000c0)={'\x00', 0x400})
r1 = openat$tun(0xffffffffffffff9c, &(0x7f0000000080)='/dev/net/tun\x00', 0x0, 0x0)
ioctl$TUNSETIFF(r1, 0x400454ca, &(0x7f0000000000)={'vet\x00\x00\x00\x00\x00\x00\x00\x00\x00\xbdh\x00', 0x43732e5398416f1a})
ioctl$TUNSETQUEUE(r0, 0x400454d9, &(0x7f0000000040)={'lo\x00', 0x200})
----------

----------
[   60.043899] IPVS: ftp: loaded support on port[0] = 21
[   60.275782] chnl_net:caif_netlink_parms(): no params data found
[   60.305039] bridge0: port 1(bridge_slave_0) entered blocking state
[   60.305551] bridge0: port 1(bridge_slave_0) entered disabled state
[   60.306366] device bridge_slave_0 entered promiscuous mode
[   60.311776] bridge0: port 2(bridge_slave_1) entered blocking state
[   60.312032] bridge0: port 2(bridge_slave_1) entered disabled state
[   60.312858] device bridge_slave_1 entered promiscuous mode
[   60.336705] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   60.338321] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   60.357851] team0: Port device team_slave_0 added
[   60.359250] team0: Port device team_slave_1 added
[   60.522829] device hsr_slave_0 entered promiscuous mode
[   60.651798] device hsr_slave_1 entered promiscuous mode
[   60.790287] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   60.854953] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   60.911733] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   60.974063] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   61.109590] bridge0: port 2(bridge_slave_1) entered blocking state
[   61.109922] bridge0: port 2(bridge_slave_1) entered forwarding state
[   61.110384] bridge0: port 1(bridge_slave_0) entered blocking state
[   61.110556] bridge0: port 1(bridge_slave_0) entered forwarding state
[   61.151643] 8021q: adding VLAN 0 to HW filter on device bond0
[   61.156692] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   61.164101] bridge0: port 1(bridge_slave_0) entered disabled state
[   61.190521] bridge0: port 2(bridge_slave_1) entered disabled state
[   61.230466] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[   61.283759] 8021q: adding VLAN 0 to HW filter on device team0
[   61.364323] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[   61.366383] bridge0: port 1(bridge_slave_0) entered blocking state
[   61.366568] bridge0: port 1(bridge_slave_0) entered forwarding state
[   61.367033] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[   61.367556] bridge0: port 2(bridge_slave_1) entered blocking state
[   61.367727] bridge0: port 2(bridge_slave_1) entered forwarding state
[   61.372342] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[   61.377760] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[   61.381755] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[   61.383474] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[   61.386511] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
[   61.405483] 8021q: adding VLAN 0 to HW filter on device batadv0
[   61.408968] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[   61.412478] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
[   61.414712] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
[   61.466051] FAULT_INJECTION: forcing a failure.
               name failslab, interval 1, probability 0, space 0, times 1
[   61.468544] CPU: 6 PID: 6365 Comm: syz-executor Not tainted 5.4.0+ #223
[   61.469778] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/29/2019
[   61.473052] Call Trace:
[   61.475277]  dump_stack+0x163/0x1d5
[   61.476597]  should_fail+0x655/0x740
[   61.477847]  ? fault_create_debugfs_attr+0x170/0x170
[   61.479192]  ? ___might_sleep+0x1de/0x500
[   61.480520]  __should_failslab+0xde/0x130
[   61.481834]  should_failslab+0x9/0x14
[   61.483145]  kmem_cache_alloc+0x28e/0x770
[   61.484448]  ? memcpy+0x45/0x50
[   61.486397]  ? kstrdup+0x59/0x70
[   61.488702]  __kernfs_new_node+0xde/0x6f0
[   61.490999]  ? kernfs_dop_revalidate+0x380/0x380
[   61.493038]  ? __put_user_ns+0x60/0x60
[   61.495621]  ? mark_lock+0x11f/0xc60
[   61.497768]  ? put_dec+0xc0/0xc0
[   61.499926]  kernfs_new_node+0x97/0x110
[   61.501971]  kernfs_create_dir_ns+0x4d/0x150
[   61.504019]  sysfs_create_dir_ns+0x13b/0x2a0
[   61.505973]  ? sysfs_create_mount_point+0xb0/0xb0
[   61.507978]  ? rwlock_bug.part.2+0x90/0x90
[   61.509917]  ? lock_acquire+0x19f/0x3f0
[   61.511893]  ? __kasan_check_read+0x11/0x20
[   61.513887]  ? do_raw_spin_unlock+0x54/0x260
[   61.515829]  kobject_add_internal+0x223/0x9a0
[   61.517825]  kobject_init_and_add+0xff/0x170
[   61.519811]  ? kset_create_and_add+0x180/0x180
[   61.521849]  ? lock_acquire+0x19f/0x3f0
[   61.523865]  ? rtnl_lock+0x17/0x20
[   61.525787]  netdev_queue_update_kobjects+0xeb/0x370
[   61.527816]  netif_set_real_num_tx_queues+0x188/0x740
[   61.530219]  ? mutex_lock_io_nested+0x14b0/0x14b0
[   61.532255]  tun_attach+0x4bd/0x1250
[   61.534231]  ? lock_acquire+0x19f/0x3f0
[   61.536130]  __tun_chr_ioctl+0x6fd/0x3b50
[   61.537960]  ? tun_flow_update+0xba0/0xba0
[   61.539709]  ? __kasan_check_read+0x11/0x20
[   61.541376]  ? mark_lock+0x11f/0xc60
[   61.543057]  ? _kstrtoull+0x11c/0x1c0
[   61.544725]  ? __kasan_check_read+0x11/0x20
[   61.546556]  ? __lock_acquire+0xc5c/0x3b30
[   61.548282]  ? __kasan_check_read+0x11/0x20
[   61.550033]  ? mark_lock+0x11f/0xc60
[   61.551749]  ? __kasan_check_read+0x11/0x20
[   61.553502]  ? __lock_acquire+0xc5c/0x3b30
[   61.555247]  ? __fget+0x31c/0x4d0
[   61.556976]  ? tun_chr_compat_ioctl+0x50/0x50
[   61.558743]  tun_chr_ioctl+0x2a/0x40
[   61.560255]  ? tun_chr_ioctl+0x2a/0x40
[   61.562490]  do_vfs_ioctl+0x1a2/0x1150
[   61.564138]  ? rcu_read_lock_held+0x9c/0xb0
[   61.565830]  ? ioctl_preallocate+0x1e0/0x1e0
[   61.567495]  ? __fget+0x33e/0x4d0
[   61.569168]  ? do_dup2+0x4d0/0x4d0
[   61.570928]  ? fput_many+0xe6/0x150
[   61.572618]  ? fput+0x1a/0x20
[   61.574382]  ? security_file_ioctl+0x81/0xb0
[   61.576049]  ksys_ioctl+0x94/0xb0
[   61.577783]  __x64_sys_ioctl+0x73/0xb0
[   61.579526]  do_syscall_64+0xde/0x6c0
[   61.581302]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   61.583010] RIP: 0033:0x45a729
[   61.584734] Code: bd b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00
[   61.590407] RSP: 002b:00007f25d540ec88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   61.592488] RAX: ffffffffffffffda RBX: 000000000071bf00 RCX: 000000000045a729
[   61.594552] RDX: 0000000020000040 RSI: 00000000400454d9 RDI: 0000000000000003
[   61.596829] RBP: 00007f25d540eca0 R08: 0000000000000000 R09: 0000000000000000
[   61.598540] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f25d540f6d4
[   61.600278] R13: 00000000004ac5a5 R14: 00000000006ee8a0 R15: 0000000000000005
[   61.655323] kobject_add_internal failed for tx-1 (error: -12 parent: queues)
[   71.760970] unregister_netdevice: waiting for vet to become free. Usage count = -1
[   82.028434] unregister_netdevice: waiting for vet to become free. Usage count = -1
[   92.140031] unregister_netdevice: waiting for vet to become free. Usage count = -1
----------

Worrisome part is that tun_attach() calls tun_set_real_num_queues() at the end of tun_attach()
but tun_set_real_num_queues() is not handling netif_set_real_num_tx_queues() failure.
That is, tun_attach() is returning success even if netdev_queue_update_kobjects() from
netif_set_real_num_tx_queues() failed.

  static void tun_set_real_num_queues(struct tun_struct *tun)
  {
          netif_set_real_num_tx_queues(tun->dev, tun->numqueues);
          netif_set_real_num_rx_queues(tun->dev, tun->numqueues);
  }

And I guess that ignoring that failure causes clean-up function to drop a refcount
which was not held by initialization function. Applying below diff seems to avoid
this problem. Please check.

----------
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index ae3bcb1540ec..562d06c274aa 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1459,14 +1459,14 @@ static int netdev_queue_add_kobject(struct net_device *dev, int index)
 	struct kobject *kobj = &queue->kobj;
 	int error = 0;
 
+	dev_hold(queue->dev);
+
 	kobj->kset = dev->queues_kset;
 	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
 				     "tx-%u", index);
 	if (error)
 		goto err;
 
-	dev_hold(queue->dev);
-
 #ifdef CONFIG_BQL
 	error = sysfs_create_group(kobj, &dql_group);
 	if (error)
----------

----------
[   64.482925] IPVS: ftp: loaded support on port[0] = 21
[   64.684701] chnl_net:caif_netlink_parms(): no params data found
[   64.757440] bridge0: port 1(bridge_slave_0) entered blocking state
[   64.757596] bridge0: port 1(bridge_slave_0) entered disabled state
[   64.760043] device bridge_slave_0 entered promiscuous mode
[   64.761799] bridge0: port 2(bridge_slave_1) entered blocking state
[   64.762025] bridge0: port 2(bridge_slave_1) entered disabled state
[   64.793334] device bridge_slave_1 entered promiscuous mode
[   64.818373] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   64.822950] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   64.843403] team0: Port device team_slave_0 added
[   64.844859] team0: Port device team_slave_1 added
[   64.933830] device hsr_slave_0 entered promiscuous mode
[   64.972990] device hsr_slave_1 entered promiscuous mode
[   65.048057] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   65.113612] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   65.191758] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   65.262611] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   65.339507] bridge0: port 2(bridge_slave_1) entered blocking state
[   65.339821] bridge0: port 2(bridge_slave_1) entered forwarding state
[   65.340340] bridge0: port 1(bridge_slave_0) entered blocking state
[   65.340514] bridge0: port 1(bridge_slave_0) entered forwarding state
[   65.486729] 8021q: adding VLAN 0 to HW filter on device bond0
[   65.545043] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   65.567266] bridge0: port 1(bridge_slave_0) entered disabled state
[   65.592695] bridge0: port 2(bridge_slave_1) entered disabled state
[   65.631471] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[   65.656557] 8021q: adding VLAN 0 to HW filter on device team0
[   65.660768] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   65.661411] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[   65.661949] bridge0: port 1(bridge_slave_0) entered blocking state
[   65.662127] bridge0: port 1(bridge_slave_0) entered forwarding state
[   65.693984] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   65.697297] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[   65.701488] bridge0: port 2(bridge_slave_1) entered blocking state
[   65.703895] bridge0: port 2(bridge_slave_1) entered forwarding state
[   65.706370] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready
[   65.724296] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
[   65.728690] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
[   65.777203] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready
[   65.782476] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready
[   65.785989] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[   65.789006] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
[   65.796973] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[   65.801313] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready
[   65.804748] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[   65.807939] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready
[   65.811874] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[   65.814814] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[   65.824311] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
[   65.835888] 8021q: adding VLAN 0 to HW filter on device batadv0
[   65.840711] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
[   65.843289] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
[   66.055083] FAULT_INJECTION: forcing a failure.
               name failslab, interval 1, probability 0, space 0, times 1
[   66.058933] CPU: 1 PID: 6375 Comm: syz-executor Not tainted 5.4.0+ #224
[   66.060904] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/29/2019
[   66.065868] Call Trace:
[   66.068993]  dump_stack+0x163/0x1d5
[   66.071611]  should_fail+0x655/0x740
[   66.074082]  ? fault_create_debugfs_attr+0x170/0x170
[   66.076772]  ? ___might_sleep+0x1de/0x500
[   66.079324]  __should_failslab+0xde/0x130
[   66.082540]  should_failslab+0x9/0x14
[   66.084806]  kmem_cache_alloc+0x28e/0x770
[   66.087262]  ? memcpy+0x45/0x50
[   66.089712]  ? kstrdup+0x59/0x70
[   66.092133]  __kernfs_new_node+0xde/0x6f0
[   66.094512]  ? kernfs_dop_revalidate+0x380/0x380
[   66.096934]  ? __put_user_ns+0x60/0x60
[   66.099303]  ? mark_lock+0x11f/0xc60
[   66.101585]  ? put_dec+0xc0/0xc0
[   66.104388]  kernfs_new_node+0x97/0x110
[   66.106537]  kernfs_create_dir_ns+0x4d/0x150
[   66.108622]  sysfs_create_dir_ns+0x13b/0x2a0
[   66.110584]  ? sysfs_create_mount_point+0xb0/0xb0
[   66.112769]  ? rwlock_bug.part.2+0x90/0x90
[   66.114866]  ? lock_acquire+0x19f/0x3f0
[   66.116925]  ? __kasan_check_read+0x11/0x20
[   66.118888]  ? do_raw_spin_unlock+0x54/0x260
[   66.120909]  kobject_add_internal+0x223/0x9a0
[   66.122835]  kobject_init_and_add+0xff/0x170
[   66.124860]  ? kset_create_and_add+0x180/0x180
[   66.126944]  ? lock_acquire+0x19f/0x3f0
[   66.129143]  ? rtnl_lock+0x17/0x20
[   66.131087]  netdev_queue_update_kobjects+0x118/0x390
[   66.133028]  ? __kasan_check_read+0x11/0x20
[   66.134944]  netif_set_real_num_tx_queues+0x188/0x740
[   66.137012]  ? mutex_lock_io_nested+0x14b0/0x14b0
[   66.139043]  tun_attach+0x4bd/0x1250
[   66.140950]  ? lock_acquire+0x19f/0x3f0
[   66.142870]  __tun_chr_ioctl+0x6fd/0x3b50
[   66.144724]  ? tun_flow_update+0xba0/0xba0
[   66.146532]  ? __kasan_check_read+0x11/0x20
[   66.148821]  ? mark_lock+0x11f/0xc60
[   66.150635]  ? _kstrtoull+0x11c/0x1c0
[   66.152399]  ? __kasan_check_read+0x11/0x20
[   66.154056]  ? __lock_acquire+0xc5c/0x3b30
[   66.155701]  ? __kasan_check_read+0x11/0x20
[   66.157438]  ? mark_lock+0x11f/0xc60
[   66.159265]  ? __kasan_check_read+0x11/0x20
[   66.161032]  ? __lock_acquire+0xc5c/0x3b30
[   66.162885]  ? __fget+0x31c/0x4d0
[   66.164619]  ? tun_chr_compat_ioctl+0x50/0x50
[   66.166104]  tun_chr_ioctl+0x2a/0x40
[   66.167538]  ? tun_chr_ioctl+0x2a/0x40
[   66.169199]  do_vfs_ioctl+0x1a2/0x1150
[   66.170969]  ? rcu_read_lock_held+0x9c/0xb0
[   66.172735]  ? ioctl_preallocate+0x1e0/0x1e0
[   66.174487]  ? __fget+0x33e/0x4d0
[   66.176170]  ? do_dup2+0x4d0/0x4d0
[   66.177866]  ? fput_many+0xe6/0x150
[   66.179520]  ? fput+0x1a/0x20
[   66.181176]  ? security_file_ioctl+0x81/0xb0
[   66.182909]  ksys_ioctl+0x94/0xb0
[   66.184452]  __x64_sys_ioctl+0x73/0xb0
[   66.186169]  do_syscall_64+0xde/0x6c0
[   66.187908]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   66.189678] RIP: 0033:0x45a729
[   66.191328] Code: bd b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00
[   66.196839] RSP: 002b:00007f08f9987c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   66.198849] RAX: ffffffffffffffda RBX: 000000000071bf00 RCX: 000000000045a729
[   66.200876] RDX: 0000000020000040 RSI: 00000000400454d9 RDI: 0000000000000003
[   66.202947] RBP: 00007f08f9987ca0 R08: 0000000000000000 R09: 0000000000000000
[   66.204491] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f08f99886d4
[   66.205688] R13: 00000000004ac5a5 R14: 00000000006ee8a0 R15: 0000000000000005
[   66.277453] kobject_add_internal failed for tx-1 (error: -12 parent: queues)
[   67.499501] syz-executor (6368) used greatest stack depth: 23704 bytes left
[   70.237146] tipc: TX() has been purged, node left!
[   75.794671] device bridge_slave_1 left promiscuous mode
[   75.797354] bridge0: port 2(bridge_slave_1) entered disabled state
[   75.861863] device bridge_slave_0 left promiscuous mode
[   75.864646] bridge0: port 1(bridge_slave_0) entered disabled state
[   79.752910] device hsr_slave_0 left promiscuous mode
[   79.841067] device hsr_slave_1 left promiscuous mode
[   79.939879] team0 (unregistering): Port device team_slave_1 removed
[   79.963767] team0 (unregistering): Port device team_slave_0 removed
[   79.985156] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   80.090348] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   80.352617] bond0 (unregistering): Released all slaves
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