On 5/29/23 06:06, yedc via discuss wrote:
> Hi OVS-team,
>
>
> We are using OpenStack platform create instances failed because of the tap
> device sudden deletion after create.
>
> Environment:
> OpenStack Zed
> OpenvSwitch 2.17.7
>
>
> VM port UUID: 6d5eccfa-069e-4058-a1c8-87bec9c1c280
> Tap device: tap6d5eccfa-06
>
> Here is some logs info:
>
> 1. ovsdb server log:
> record 554: 2023-05-19 10:48:42.399
> table Interface insert row "tap6d5eccfa-06" (8d7bdf97):
> table Open_vSwitch row 1a4db534 (1a4db534) diff:
> table Bridge row "br-int" (ee9ab5d4) diff:
> table Port insert row "tap6d5eccfa-06" (a4be79ec):
>
> record 555: 2023-05-19 10:48:42.411
> table Interface row "tap6d5eccfa-06" (8d7bdf97) diff:
> table Open_vSwitch row 1a4db534 (1a4db534) diff:
>
> record 556: 2023-05-19 10:48:42.909
> table Interface row "tap6d5eccfa-06" (8d7bdf97) diff:
>
> record 557: 2023-05-19 10:48:42.941 "ovs-vsctl (invoked by init (pid 0)):
> ovs-vsctl del-port tap6d5eccfa-06"
> table Open_vSwitch row 1a4db534 (1a4db534) diff:
> table Interface row "tap6d5eccfa-06" (8d7bdf97) diff:
> delete row
> table Bridge row "br-int" (ee9ab5d4) diff:
> table Port row "tap6d5eccfa-06" (a4be79ec) diff:
> delete row
>
>
> 2. ovs-vswitchd log:
> 2023-05-19T10:48:42.400Z|13247|jsonrpc|DBG|unix:/run/openvswitch/db.sock:
> received notification, method="update3",
> params=[["monid","Open_vSwitch"],"00000000-0000-0000-0000-000000000000",{"Open_vSwitch":{"1a4db534-3133-43e0-922e-dd7d5d76a802":{"modify":{"next_cfg":135}}},"Interface":{"8d7bdf97-1f91-4ef3-9b27-b2a9e7c362e2":{"insert":{"name":"tap6d5eccfa-06"}}},"Port":{"a4be79ec-df95-495b-87e1-fc373582f647":{"insert":{"name":"tap6d5eccfa-06","interfaces":["uuid","8d7bdf97-1f91-4ef3-9b27-b2a9e7c362e2"]}}},"Bridge":{"ee9ab5d4-b72b-479b-87cd-29a19d5540a8":{"modify":{"ports":["uuid","a4be79ec-df95-495b-87e1-fc373582f647"]}}}}]
> 2023-05-19T10:48:42.410Z|13248|bridge|WARN|could not open network device
> tap6d5eccfa-06 (No such device)
> 2023-05-19T10:48:42.411Z|13249|jsonrpc|DBG|unix:/run/openvswitch/db.sock:
> send request, method="transact",
> params=["Open_vSwitch",{"row":{"cur_cfg":135},"where":[["_uuid","==",["uuid","1a4db534-3133-43e0-922e-dd7d5d76a802"]]],"table":"Open_vSwitch","op":"update"},{"row":{"error":"could
> not open network device tap6d5eccfa-06 (No such
> device)","ofport":-1},"where":[["_uuid","==",["uuid","8d7bdf97-1f91-4ef3-9b27-b2a9e7c362e2"]]],"table":"Interface","op":"update"},{"op":"assert","lock":"ovs_vswitchd"}],
> id=4787
> 2023-05-19T10:48:42.412Z|13250|poll_loop|DBG|wakeup due to [POLLIN] on fd 13
> (<->/run/openvswitch/db.sock) at ../lib/stream-fd.c:157 (4% CPU usage)
> 2023-05-19T10:48:42.412Z|13251|jsonrpc|DBG|unix:/run/openvswitch/db.sock:
> received notification, method="update3",
> params=[["monid","Open_vSwitch"],"00000000-0000-0000-0000-000000000000",{"Interface":{"8d7bdf97-1f91-4ef3-9b27-b2a9e7c362e2":{"modify":{"error":"could
> not open network device tap6d5eccfa-06 (No such
> device)","ofport":-1}}},"Open_vSwitch":{"1a4db534-3133-43e0-922e-dd7d5d76a802":{"modify":{"cur_cfg":135}}}}]
>
> 2023-05-19T10:48:42.907Z|13260|vconn|DBG|unix#50: sent (Success):
> OFPT_PORT_STATUS (OF1.5) (xid=0x0): ADD: 57(tap6d5eccfa-06):
> addr:fe:16:3e:dc:bc:b8
> config: 0
> state: 0
> current: 10MB-FD COPPER
> speed: 10 Mbps now, 0 Mbps max
> 2023-05-19T10:48:42.907Z|13261|bridge|INFO|bridge br-int: added interface
> tap6d5eccfa-06 on port 57
> 2023-05-19T10:48:42.908Z|13262|hmap|DBG|Dropped 74 log messages in last 6
> seconds (most recently, 1 seconds ago) due to excessive rate
> 2023-05-19T10:48:42.908Z|13263|hmap|DBG|../ofproto/ofproto-dpif-xlate.c:884:
> 1 bucket with 6+ nodes, including 1 bucket with 7 nodes (16 nodes total
> across 16 buckets)
> 2023-05-19T10:48:42.908Z|13264|dpif_netlink|DBG|port_changed:
> dpif:system@ovs-system vport:tap6d5eccfa-06 cmd:1
> 2023-05-19T10:48:42.908Z|13265|vconn|DBG|unix#50: sent (Success):
> OFPT_PORT_STATUS (OF1.5) (xid=0x0): MOD: 57(tap6d5eccfa-06):
> addr:fe:16:3e:dc:bc:b8
> config: 0
> state: LIVE
> current: 10MB-FD COPPER
> speed: 10 Mbps now, 0 Mbps max
>
> 2023-05-19T10:48:42.971Z|13289|bridge|INFO|bridge br-int: deleted interface
> tap6d5eccfa-06 on port 57
> 2023-05-19T10:48:42.972Z|04671|poll_loop(revalidator62)|DBG|wakeup due to
> [POLLIN] on fd 43 (FIFO pipe:[154647]) at ../lib/ovs-thread.c:378 (0% CPU
> usage)
> 2023-05-19T10:48:42.972Z|04651|poll_loop(revalidator63)|DBG|wakeup due to
> [POLLIN] on fd 45 (FIFO pipe:[154648]) at ../lib/ovs-thread.c:378 (0% CPU
> usage)
> 2023-05-19T10:48:42.975Z|04672|poll_loop(revalidator62)|DBG|wakeup due to
> [POLLIN] on fd 43 (FIFO pipe:[154647]) at ../lib/ovs-thread.c:378 (0% CPU
> usage)
> 2023-05-19T10:48:42.975Z|13290|dpif|DBG|system@ovs-system: failed to query
> port tap6d5eccfa-06: No such device
> 2023-05-19T10:48:42.982Z|07648|poll_loop(revalidator61)|DBG|wakeup due to
> [POLLIN] on fd 41 (FIFO pipe:[155716]) at ../lib/ovs-thread.c:378 (10% CPU
> usage)
> 2023-05-19T10:48:42.984Z|04719|poll_loop(revalidator65)|DBG|wakeup due to
> [POLLIN] on fd 49 (FIFO pipe:[149813]) at ../lib/ovs-thread.c:378 (0% CPU
> usage)
> 2023-05-19T10:48:42.984Z|04589|poll_loop(revalidator64)|DBG|wakeup due to
> [POLLIN] on fd 47 (FIFO pipe:[154649]) at ../lib/ovs-thread.c:378 (1% CPU
> usage)
> 2023-05-19T10:48:42.985Z|13291|poll_loop|DBG|wakeup due to [POLLIN] on fd 56
> (FIFO pipe:[136293]) at ../lib/ovs-rcu.c:236 (2% CPU usage)
> 2023-05-19T10:48:42.999Z|13292|poll_loop|DBG|wakeup due to [POLLIN] on fd 56
> (FIFO pipe:[136293]) at ../lib/ovs-rcu.c:236 (2% CPU usage)
> 2023-05-19T10:48:42.999Z|13293|dpif_netlink|DBG|port_changed:
> dpif:system@ovs-system vport:tap6d5eccfa-06 cmd:2
> 2023-05-19T10:48:42.999Z|13294|dpif|DBG|system@ovs-system: failed to query
> port tap6d5eccfa-06: No such device
>
>
> It seems that OVS successfully add tap device(tap6d5eccfa-06) in br-int, then
> quickly delete the device.
>
> Any idea what’s going on here? Or how to debug in next stage.
Well, it wasn't OVS. Someone/something asked OVS to delete the port:
"ovs-vsctl (invoked by init (pid 0)): ovs-vsctl del-port tap6d5eccfa-06"
Someone/something called ovs-vsctl del-port command.
Best regards, Ilya Maximets.
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