Date:   Fri, 14 Apr 2017 15:44:53 -0700
From:   Joe Stringer <joe@....org>
To:     Mahesh Bandewar <mahesh@...dewar.net>
Cc:     Jay Vosburgh <j.vosburgh@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Veaceslav Falico <vfalico@...il.com>,
        Nikolay Aleksandrov <nikolay@...hat.com>,
        David Miller <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        netdev <netdev@...r.kernel.org>,
        Mahesh Bandewar <maheshb@...gle.com>
Subject: Re: [PATCH next 2/5] bonding: initialize work-queues during creation
 of bond

On 8 March 2017 at 10:55, Mahesh Bandewar <mahesh@...dewar.net> wrote:
> From: Mahesh Bandewar <maheshb@...gle.com>
>
> Initializing work-queues every time ifup operation performed is unnecessary
> and can be performed only once when the port is created.
>
> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
> ---
>  drivers/net/bonding/bond_main.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 619f0c65f18a..1329110ed85f 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -3270,8 +3270,6 @@ static int bond_open(struct net_device *bond_dev)
>                 }
>         }
>
> -       bond_work_init_all(bond);
> -
>         if (bond_is_lb(bond)) {
>                 /* bond_alb_initialize must be called before the timer
>                  * is started.
> @@ -4691,6 +4689,8 @@ int bond_create(struct net *net, const char *name)
>
>         netif_carrier_off(bond_dev);
>
> +       bond_work_init_all(bond);
> +
>         rtnl_unlock();
>         if (res < 0)
>                 bond_destructor(bond_dev);
> --

Hi Mahesh,

I've noticed that this patch breaks bonding within namespaces if
you're not careful to perform device cleanup correctly.

Here's my repro script, you can run on any net-next with this patch
and you'll start seeing some weird behaviour:

ip netns add foo
ip li add veth0 type veth peer name veth0+ netns foo
ip li add veth1 type veth peer name veth1+ netns foo
ip netns exec foo ip li add bond0 type bond
ip netns exec foo ip li set dev veth0+ master bond0
ip netns exec foo ip li set dev veth1+ master bond0
ip netns exec foo ip addr add dev bond0 192.168.0.1/24
ip netns exec foo ip li set dev bond0 up
ip li del dev veth0
ip li del dev veth1

The second to last command segfaults, last command hangs. rtnl is now
permanently locked. It's not a problem if you take bond0 down before
deleting veths, or delete bond0 before deleting veths. If you delete
either end of the veth pair as per above, either inside or outside the
namespace, it hits this problem.

Here's some kernel logs:
[ 1221.801610] bond0: Enslaving veth0+ as an active interface with an up link
[ 1224.449581] bond0: Enslaving veth1+ as an active interface with an up link
[ 1281.193863] bond0: Releasing backup interface veth0+
[ 1281.193866] bond0: the permanent HWaddr of veth0+ -
16:bf:fb:e0:b8:43 - is still in use by bond0 - set the HWaddr of
veth0+ to a different address to avoid conflicts
[ 1281.193867] ------------[ cut here ]------------
[ 1281.193873] WARNING: CPU: 0 PID: 2024 at kernel/workqueue.c:1511
__queue_delayed_work+0x13f/0x150
[ 1281.193873] Modules linked in: bonding veth openvswitch nf_nat_ipv6
nf_nat_ipv4 nf_nat autofs4 nfsd auth_rpcgss nfs_acl binfmt_misc nfs
lockd grace sunrpc fscache ppdev vmw_balloon coretemp psmouse
serio_raw vmwgfx ttm drm_kms_helper vmw_vmci netconsole parport_pc
configfs drm i2c_piix4 fb_sys_fops syscopyarea sysfillrect sysimgblt
shpchp mac_hid nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4
nf_defrag_ipv4 nf_conntrack libcrc32c lp parport hid_generic usbhid
hid mptspi mptscsih e1000 mptbase ahci libahci
[ 1281.193905] CPU: 0 PID: 2024 Comm: ip Tainted: G        W
4.10.0-bisect-bond-v0.14 #37
[ 1281.193906] Hardware name: VMware, Inc. VMware Virtual
Platform/440BX Desktop Reference Platform, BIOS 6.00 09/30/2014
[ 1281.193906] Call Trace:
[ 1281.193912]  dump_stack+0x63/0x89
[ 1281.193915]  __warn+0xd1/0xf0
[ 1281.193917]  warn_slowpath_null+0x1d/0x20
[ 1281.193918]  __queue_delayed_work+0x13f/0x150
[ 1281.193920]  queue_delayed_work_on+0x27/0x40
[ 1281.193929]  bond_change_active_slave+0x25b/0x670 [bonding]
[ 1281.193932]  ? synchronize_rcu_expedited+0x27/0x30
[ 1281.193935]  __bond_release_one+0x489/0x510 [bonding]
[ 1281.193939]  ? addrconf_notify+0x1b7/0xab0
[ 1281.193942]  bond_netdev_event+0x2c5/0x2e0 [bonding]
[ 1281.193944]  ? netconsole_netdev_event+0x124/0x190 [netconsole]
[ 1281.193947]  notifier_call_chain+0x49/0x70
[ 1281.193948]  raw_notifier_call_chain+0x16/0x20
[ 1281.193950]  call_netdevice_notifiers_info+0x35/0x60
[ 1281.193951]  rollback_registered_many+0x23b/0x3e0
[ 1281.193953]  unregister_netdevice_many+0x24/0xd0
[ 1281.193955]  rtnl_delete_link+0x3c/0x50
[ 1281.193956]  rtnl_dellink+0x8d/0x1b0
[ 1281.193960]  rtnetlink_rcv_msg+0x95/0x220
[ 1281.193962]  ? __kmalloc_node_track_caller+0x35/0x280
[ 1281.193964]  ? __netlink_lookup+0xf1/0x110
[ 1281.193966]  ? rtnl_newlink+0x830/0x830
[ 1281.193967]  netlink_rcv_skb+0xa7/0xc0
[ 1281.193969]  rtnetlink_rcv+0x28/0x30
[ 1281.193970]  netlink_unicast+0x15b/0x210
[ 1281.193971]  netlink_sendmsg+0x319/0x390
[ 1281.193974]  sock_sendmsg+0x38/0x50
[ 1281.193975]  ___sys_sendmsg+0x25c/0x270
[ 1281.193978]  ? mem_cgroup_commit_charge+0x76/0xf0
[ 1281.193981]  ? page_add_new_anon_rmap+0x89/0xc0
[ 1281.193984]  ? lru_cache_add_active_or_unevictable+0x35/0xb0
[ 1281.193985]  ? __handle_mm_fault+0x4e9/0x1170
[ 1281.193987]  __sys_sendmsg+0x45/0x80
[ 1281.193989]  SyS_sendmsg+0x12/0x20
[ 1281.193991]  do_syscall_64+0x6e/0x180
[ 1281.193993]  entry_SYSCALL64_slow_path+0x25/0x25
[ 1281.193995] RIP: 0033:0x7f6ec122f5a0
[ 1281.193995] RSP: 002b:00007ffe69e89c48 EFLAGS: 00000246 ORIG_RAX:
000000000000002e
[ 1281.193997] RAX: ffffffffffffffda RBX: 00007ffe69e8dd60 RCX: 00007f6ec122f5a0
[ 1281.193997] RDX: 0000000000000000 RSI: 00007ffe69e89c90 RDI: 0000000000000003
[ 1281.193998] RBP: 00007ffe69e89c90 R08: 0000000000000000 R09: 0000000000000003
[ 1281.193999] R10: 00007ffe69e89a10 R11: 0000000000000246 R12: 0000000058f14b9f
[ 1281.193999] R13: 0000000000000000 R14: 00000000006473a0 R15: 00007ffe69e8e450
[ 1281.194001] ---[ end trace 713a77486cbfbfa3 ]---
[ 1281.194002] ------------[ cut here ]------------
[ 1281.194004] WARNING: CPU: 0 PID: 2024 at kernel/workqueue.c:1513
__queue_delayed_work+0x103/0x150
[ 1281.194004] Modules linked in: bonding veth openvswitch nf_nat_ipv6
nf_nat_ipv4 nf_nat autofs4 nfsd auth_rpcgss nfs_acl binfmt_misc nfs
lockd grace sunrpc fscache ppdev vmw_balloon coretemp psmouse
serio_raw vmwgfx ttm drm_kms_helper vmw_vmci netconsole parport_pc
configfs drm i2c_piix4 fb_sys_fops syscopyarea sysfillrect sysimgblt
shpchp mac_hid nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4
nf_defrag_ipv4 nf_conntrack libcrc32c lp parport hid_generic usbhid
hid mptspi mptscsih e1000 mptbase ahci libahci
[ 1281.194022] CPU: 0 PID: 2024 Comm: ip Tainted: G        W
4.10.0-bisect-bond-v0.14 #37
[ 1281.194023] Hardware name: VMware, Inc. VMware Virtual
Platform/440BX Desktop Reference Platform, BIOS 6.00 09/30/2014
[ 1281.194023] Call Trace:
[ 1281.194025]  dump_stack+0x63/0x89
[ 1281.194027]  __warn+0xd1/0xf0
[ 1281.194028]  warn_slowpath_null+0x1d/0x20
[ 1281.194030]  __queue_delayed_work+0x103/0x150
[ 1281.194031]  queue_delayed_work_on+0x27/0x40
[ 1281.194034]  bond_change_active_slave+0x25b/0x670 [bonding]
[ 1281.194035]  ? synchronize_rcu_expedited+0x27/0x30
[ 1281.194039]  __bond_release_one+0x489/0x510 [bonding]
[ 1281.194043]  ? addrconf_notify+0x1b7/0xab0
[ 1281.194047]  bond_netdev_event+0x2c5/0x2e0 [bonding]
[ 1281.194048]  ? netconsole_netdev_event+0x124/0x190 [netconsole]
[ 1281.194050]  notifier_call_chain+0x49/0x70
[ 1281.194052]  raw_notifier_call_chain+0x16/0x20
[ 1281.194053]  call_netdevice_notifiers_info+0x35/0x60
[ 1281.194054]  rollback_registered_many+0x23b/0x3e0
[ 1281.194056]  unregister_netdevice_many+0x24/0xd0
[ 1281.194057]  rtnl_delete_link+0x3c/0x50
[ 1281.194059]  rtnl_dellink+0x8d/0x1b0
[ 1281.194062]  rtnetlink_rcv_msg+0x95/0x220
[ 1281.194064]  ? __kmalloc_node_track_caller+0x35/0x280
[ 1281.194065]  ? __netlink_lookup+0xf1/0x110
[ 1281.194066]  ? rtnl_newlink+0x830/0x830
[ 1281.194068]  netlink_rcv_skb+0xa7/0xc0
[ 1281.194069]  rtnetlink_rcv+0x28/0x30
[ 1281.194070]  netlink_unicast+0x15b/0x210
[ 1281.194071]  netlink_sendmsg+0x319/0x390
[ 1281.194073]  sock_sendmsg+0x38/0x50
[ 1281.194074]  ___sys_sendmsg+0x25c/0x270
[ 1281.194076]  ? mem_cgroup_commit_charge+0x76/0xf0
[ 1281.194077]  ? page_add_new_anon_rmap+0x89/0xc0
[ 1281.194079]  ? lru_cache_add_active_or_unevictable+0x35/0xb0
[ 1281.194080]  ? __handle_mm_fault+0x4e9/0x1170
[ 1281.194082]  __sys_sendmsg+0x45/0x80
[ 1281.194084]  SyS_sendmsg+0x12/0x20
[ 1281.194085]  do_syscall_64+0x6e/0x180
[ 1281.194087]  entry_SYSCALL64_slow_path+0x25/0x25
[ 1281.194087] RIP: 0033:0x7f6ec122f5a0
[ 1281.194088] RSP: 002b:00007ffe69e89c48 EFLAGS: 00000246 ORIG_RAX:
000000000000002e
[ 1281.194089] RAX: ffffffffffffffda RBX: 00007ffe69e8dd60 RCX: 00007f6ec122f5a0
[ 1281.194090] RDX: 0000000000000000 RSI: 00007ffe69e89c90 RDI: 0000000000000003
[ 1281.194090] RBP: 00007ffe69e89c90 R08: 0000000000000000 R09: 0000000000000003
[ 1281.194091] R10: 00007ffe69e89a10 R11: 0000000000000246 R12: 0000000058f14b9f
[ 1281.194092] R13: 0000000000000000 R14: 00000000006473a0 R15: 00007ffe69e8e450
[ 1281.194093] ---[ end trace 713a77486cbfbfa4 ]---
[ 1281.194103] ------------[ cut here ]------------
[ 1281.194148] kernel BUG at kernel/time/timer.c:933!
[ 1281.194173] invalid opcode: 0000 [#1] PREEMPT SMP
[ 1281.194197] Modules linked in: bonding veth openvswitch nf_nat_ipv6
nf_nat_ipv4 nf_nat autofs4 nfsd auth_rpcgss nfs_acl binfmt_misc nfs
lockd grace sunrpc fscache ppdev vmw_balloon coretemp psmouse
serio_raw vmwgfx ttm drm_kms_helper vmw_vmci netconsole parport_pc
configfs drm i2c_piix4 fb_sys_fops syscopyarea sysfillrect sysimgblt
shpchp mac_hid nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4
nf_defrag_ipv4 nf_conntrack libcrc32c lp parport hid_generic usbhid
hid mptspi mptscsih e1000 mptbase ahci libahci
[ 1281.194436] CPU: 0 PID: 2024 Comm: ip Tainted: G        W
4.10.0-bisect-bond-v0.14 #37
[ 1281.194475] Hardware name: VMware, Inc. VMware Virtual
Platform/440BX Desktop Reference Platform, BIOS 6.00 09/30/2014
[ 1281.194523] task: ffff945934df8000 task.stack: ffffb3da03030000
[ 1281.194553] RIP: 0010:__mod_timer.part.35+0x4/0x6
[ 1281.194578] RSP: 0018:ffffb3da03033748 EFLAGS: 00010046
[ 1281.194604] RAX: 00000001000ef8bc RBX: ffff9459379ccbf0 RCX: 00000001000ef8bd
[ 1281.194656] RDX: ffff9459379ccbd0 RSI: 0000000000000000 RDI: ffff9459379ccbf0
[ 1281.194690] RBP: ffffb3da03033748 R08: 0000000000000000 R09: 0000000000000706
[ 1281.194722] R10: 0000000000000004 R11: 0000000000000000 R12: ffff945939575800
[ 1281.194755] R13: 00000001000ef8bd R14: ffff945934362000 R15: ffff9459379cc000
[ 1281.194788] FS:  00007f6ec190f740(0000) GS:ffff94593b600000(0000)
knlGS:0000000000000000
[ 1281.194825] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1281.194852] CR2: 00007ffe69e89c70 CR3: 000000007680f000 CR4: 00000000000006f0
[ 1281.194930] Call Trace:
[ 1281.194952]  add_timer+0x1ee/0x1f0
[ 1281.194973]  __queue_delayed_work+0x78/0x150
[ 1281.194995]  queue_delayed_work_on+0x27/0x40
[ 1281.195021]  bond_change_active_slave+0x25b/0x670 [bonding]
[ 1281.195049]  ? synchronize_rcu_expedited+0x27/0x30
[ 1281.195076]  __bond_release_one+0x489/0x510 [bonding]
[ 1281.195107]  ? addrconf_notify+0x1b7/0xab0
[ 1281.195133]  bond_netdev_event+0x2c5/0x2e0 [bonding]
[ 1281.195159]  ? netconsole_netdev_event+0x124/0x190 [netconsole]
[ 1281.195189]  notifier_call_chain+0x49/0x70
[ 1281.195945]  raw_notifier_call_chain+0x16/0x20
[ 1281.196690]  call_netdevice_notifiers_info+0x35/0x60
[ 1281.197439]  rollback_registered_many+0x23b/0x3e0
[ 1281.198178]  unregister_netdevice_many+0x24/0xd0
[ 1281.198908]  rtnl_delete_link+0x3c/0x50
[ 1281.199641]  rtnl_dellink+0x8d/0x1b0
[ 1281.200355]  rtnetlink_rcv_msg+0x95/0x220
[ 1281.201043]  ? __kmalloc_node_track_caller+0x35/0x280
[ 1281.201717]  ? __netlink_lookup+0xf1/0x110
[ 1281.202369]  ? rtnl_newlink+0x830/0x830
[ 1281.203000]  netlink_rcv_skb+0xa7/0xc0
[ 1281.203609]  rtnetlink_rcv+0x28/0x30
[ 1281.204202]  netlink_unicast+0x15b/0x210
[ 1281.204779]  netlink_sendmsg+0x319/0x390
[ 1281.205332]  sock_sendmsg+0x38/0x50
[ 1281.205875]  ___sys_sendmsg+0x25c/0x270
[ 1281.206411]  ? mem_cgroup_commit_charge+0x76/0xf0
[ 1281.206949]  ? page_add_new_anon_rmap+0x89/0xc0
[ 1281.207480]  ? lru_cache_add_active_or_unevictable+0x35/0xb0
[ 1281.208011]  ? __handle_mm_fault+0x4e9/0x1170
[ 1281.208540]  __sys_sendmsg+0x45/0x80
[ 1281.209064]  SyS_sendmsg+0x12/0x20
[ 1281.209585]  do_syscall_64+0x6e/0x180
[ 1281.210093]  entry_SYSCALL64_slow_path+0x25/0x25
[ 1281.210596] RIP: 0033:0x7f6ec122f5a0
[ 1281.211085] RSP: 002b:00007ffe69e89c48 EFLAGS: 00000246 ORIG_RAX:
000000000000002e
[ 1281.211591] RAX: ffffffffffffffda RBX: 00007ffe69e8dd60 RCX: 00007f6ec122f5a0
[ 1281.212108] RDX: 0000000000000000 RSI: 00007ffe69e89c90 RDI: 0000000000000003
[ 1281.212630] RBP: 00007ffe69e89c90 R08: 0000000000000000 R09: 0000000000000003
[ 1281.213151] R10: 00007ffe69e89a10 R11: 0000000000000246 R12: 0000000058f14b9f
[ 1281.213665] R13: 0000000000000000 R14: 00000000006473a0 R15: 00007ffe69e8e450
[ 1281.214178] Code: 07 27 00 89 c3 eb aa 4c 89 e7 4c 89 ee 49 81 c4
40 02 00 00 e8 7b 58 69 00 e9 56 ff ff ff 5b 41 5c 41 5d 41 5e 5d c3
55 48 89 e5 <0f> 0b 55 31 c0 b9 14 00 00 00 48 89 e5 48 83 ec 50 48 8d
7d b0
[ 1281.215859] RIP: __mod_timer.part.35+0x4/0x6 RSP: ffffb3da03033748
[ 1281.217612] ---[ end trace 713a77486cbfbfa5 ]---

Any ideas how to fix this?

Cheers,
Joe

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