Re: It's back! (Re: [REGRESSION] NFS is creating a hidden port (left over from xs_bind() ))

From: Steven Rostedt
Date: Thu Jun 30 2016 - 18:10:40 EST

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In reply to: Steven Rostedt: "Re: It's back! (Re: [REGRESSION] NFS is creating a hidden port (left over from xs_bind() ))"
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On Thu, 30 Jun 2016 16:07:26 -0400
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> I can reproduce this by having the client unmount and remount the
> directory.

It gets even more interesting. When I unmount the directory, the hidden
port does not go away. It is still there. But if I mount it again, it
goes away (until it times out again).

Even more info:

When I first mount it, it creates 3 sockets, where one immediately is
closed:

tcp 0 0 192.168.23.9:892 192.168.23.22:44672 TIME_WAIT -
tcp 0 0 192.168.23.9:2049 192.168.23.22:815 ESTABLISHED -
tcp 0 0 192.168.23.9:754 192.168.23.22:44672 ESTABLISHED -

(192.168.23.22 is the machine remotely mounting a directory from the
server 192.168.23.9)

The trace of port 892 is this:

kworker/u32:1-13473 [000] .... 4093.915114: xs_setup_tcp: RPC: set up xprt to 192.168.23.22 (port 44672) via tcp
kworker/u32:1-13473 [000] .... 4093.915122: xprt_create_transport: RPC: created transport ffff8803b1c38000 with 65536 slots
kworker/0:1H-129 [000] .... 4093.915152: xprt_alloc_slot: RPC: 47 reserved req ffff88040b27ca00 xid c50ccaff
kworker/0:1H-129 [000] .... 4093.915157: xprt_connect: RPC: 47 xprt_connect xprt ffff8803b1c38000 is not connected
kworker/0:1H-129 [000] .... 4093.915159: xs_connect: RPC: xs_connect scheduled xprt ffff8803b1c38000
kworker/0:1H-129 [000] ..s. 4093.915170: inet_csk_get_port: snum 892
kworker/0:1H-129 [000] ..s. 4093.915177: <stack trace>
=> sched_clock
=> inet_addr_type_table
=> security_capable
=> inet_bind
=> xs_bind
=> release_sock
=> sock_setsockopt
=> __sock_create
=> xs_create_sock.isra.19
=> xs_tcp_setup_socket
=> process_one_work
=> worker_thread
=> worker_thread
=> kthread
=> ret_from_fork
=> kthread
kworker/0:1H-129 [000] ..s. 4093.915178: inet_bind_hash: add 892 ffff8803bb9b5cc0
kworker/0:1H-129 [000] ..s. 4093.915184: <stack trace>
=> inet_csk_get_port
=> sched_clock
=> inet_addr_type_table
=> security_capable
=> inet_bind
=> xs_bind
=> release_sock
=> sock_setsockopt
=> __sock_create
=> xs_create_sock.isra.19
=> xs_tcp_setup_socket
=> process_one_work
=> worker_thread
=> worker_thread
=> kthread
=> ret_from_fork
=> kthread
kworker/0:1H-129 [000] .... 4093.915185: xs_bind: RPC: xs_bind 4.136.255.255:892: ok (0)
kworker/0:1H-129 [000] .... 4093.915186: xs_tcp_setup_socket: RPC: worker connecting xprt ffff8803b1c38000 via tcp to 192.168.23.22 (port 44672)
kworker/0:1H-129 [000] .... 4093.915221: xs_tcp_setup_socket: RPC: ffff8803b1c38000 connect status 115 connected 0 sock state 2
<idle>-0 [003] ..s. 4093.915434: xs_tcp_state_change: RPC: xs_tcp_state_change client ffff8803b1c38000...
<idle>-0 [003] ..s. 4093.915435: xs_tcp_state_change: RPC: state 1 conn 0 dead 0 zapped 1 sk_shutdown 0
kworker/3:1H-145 [003] .... 4093.915558: xprt_connect_status: RPC: 47 xprt_connect_status: retrying
kworker/3:1H-145 [003] .... 4093.915560: xprt_prepare_transmit: RPC: 47 xprt_prepare_transmit
kworker/3:1H-145 [003] .... 4093.915562: xprt_transmit: RPC: 47 xprt_transmit(72)
kworker/3:1H-145 [003] .... 4093.915588: xs_tcp_send_request: RPC: xs_tcp_send_request(72) = 0
kworker/3:1H-145 [003] .... 4093.915589: xprt_transmit: RPC: 47 xmit complete
<idle>-0 [003] ..s. 4093.915969: xs_tcp_data_ready: RPC: xs_tcp_data_ready...
kworker/3:1H-145 [003] .... 4093.916081: xs_tcp_data_recv: RPC: xs_tcp_data_recv started
kworker/3:1H-145 [003] .... 4093.916083: xs_tcp_data_recv: RPC: reading TCP record fragment of length 24
kworker/3:1H-145 [003] .... 4093.916084: xs_tcp_data_recv: RPC: reading XID (4 bytes)
kworker/3:1H-145 [003] .... 4093.916085: xs_tcp_data_recv: RPC: reading request with XID c50ccaff
kworker/3:1H-145 [003] .... 4093.916086: xs_tcp_data_recv: RPC: reading CALL/REPLY flag (4 bytes)
kworker/3:1H-145 [003] .... 4093.916087: xs_tcp_data_recv: RPC: read reply XID c50ccaff
kworker/3:1H-145 [003] ..s. 4093.916088: xs_tcp_data_recv: RPC: XID c50ccaff read 16 bytes
kworker/3:1H-145 [003] ..s. 4093.916089: xs_tcp_data_recv: RPC: xprt = ffff8803b1c38000, tcp_copied = 24, tcp_offset = 24, tcp_reclen = 24
kworker/3:1H-145 [003] ..s. 4093.916090: xprt_complete_rqst: RPC: 47 xid c50ccaff complete (24 bytes received)
kworker/3:1H-145 [003] .... 4093.916091: xs_tcp_data_recv: RPC: xs_tcp_data_recv done
kworker/3:1H-145 [003] .... 4093.916098: xprt_release: RPC: 47 release request ffff88040b27ca00
kworker/u32:1-13473 [002] .... 4093.976056: xprt_destroy: RPC: destroying transport ffff8803b1c38000
kworker/u32:1-13473 [002] .... 4093.976068: xs_destroy: RPC: xs_destroy xprt ffff8803b1c38000
kworker/u32:1-13473 [002] .... 4093.976069: xs_close: RPC: xs_close xprt ffff8803b1c38000
kworker/u32:1-13473 [002] ..s. 4093.976096: xs_tcp_state_change: RPC: xs_tcp_state_change client ffff8803b1c38000...
kworker/u32:1-13473 [002] ..s. 4093.976098: xs_tcp_state_change: RPC: state 4 conn 1 dead 0 zapped 1 sk_shutdown 3
kworker/u32:1-13473 [002] .... 4093.976103: xprt_disconnect_done: RPC: disconnected transport ffff8803b1c38000
kworker/u32:1-13473 [002] .... 4093.976104: xprt_disconnect_done: disconnect transport!
kworker/u32:1-13473 [002] .... 4093.976113: <stack trace>
=> xs_destroy
=> xprt_switch_free
=> rpc_free_client
=> rpc_release_client
=> rpc_shutdown_client
=> load_balance
=> ttwu_do_wakeup
=> nfsd4_process_cb_update.isra.14
=> __switch_to
=> pick_next_task_fair
=> nfsd4_run_cb_work
=> process_one_work
=> worker_thread
=> worker_thread
=> kthread
=> ret_from_fork
=> kthread

Immediately followed by setting up of the port that will eventually turn into the hidden port:

kworker/u32:1-13473 [002] .... 4093.976128: xs_setup_tcp: RPC: set up xprt to 192.168.23.22 (port 44672) via tcp
kworker/u32:1-13473 [002] .... 4093.976136: xprt_create_transport: RPC: created transport ffff8803b8c22000 with 65536 slots
kworker/2:1H-144 [002] .... 4093.976209: xprt_alloc_slot: RPC: 48 reserved req ffff8803bfe89c00 xid 10c028fe
kworker/2:1H-144 [002] .... 4093.976213: xprt_connect: RPC: 48 xprt_connect xprt ffff8803b8c22000 is not connected
kworker/2:1H-144 [002] .... 4093.976215: xs_connect: RPC: xs_connect scheduled xprt ffff8803b8c22000
kworker/2:1H-144 [002] ..s. 4093.976231: inet_csk_get_port: snum 754
kworker/2:1H-144 [002] ..s. 4093.976239: <stack trace>
=> sched_clock
=> inet_addr_type_table
=> security_capable
=> inet_bind
=> xs_bind
=> release_sock
=> sock_setsockopt
=> __sock_create
=> xs_create_sock.isra.19
=> xs_tcp_setup_socket
=> process_one_work
=> worker_thread
=> worker_thread
=> kthread
=> ret_from_fork
=> kthread
kworker/2:1H-144 [002] ..s. 4093.976239: inet_bind_hash: add 754 ffff8803afc20e40
kworker/2:1H-144 [002] ..s. 4093.976247: <stack trace>
=> inet_csk_get_port
=> sched_clock
=> inet_addr_type_table
=> security_capable
=> inet_bind
=> xs_bind
=> release_sock
=> sock_setsockopt
=> __sock_create
=> xs_create_sock.isra.19
=> xs_tcp_setup_socket
=> process_one_work
=> worker_thread
=> worker_thread
=> kthread
=> ret_from_fork
=> kthread
kworker/2:1H-144 [002] .... 4093.976248: xs_bind: RPC: xs_bind 4.136.255.255:754: ok (0)
kworker/2:1H-144 [002] .... 4093.976250: xs_tcp_setup_socket: RPC: worker connecting xprt ffff8803b8c22000 via tcp to 192.168.23.22 (port 44672)
kworker/2:1H-144 [002] .... 4093.976284: xs_tcp_setup_socket: RPC: ffff8803b8c22000 connect status 115 connected 0 sock state 2
<idle>-0 [003] ..s. 4093.976456: xs_tcp_state_change: RPC: xs_tcp_state_change client ffff8803b8c22000...
<idle>-0 [003] ..s. 4093.976458: xs_tcp_state_change: RPC: state 1 conn 0 dead 0 zapped 1 sk_shutdown 0
kworker/3:1H-145 [003] .... 4093.976588: xprt_connect_status: RPC: 48 xprt_connect_status: retrying
kworker/3:1H-145 [003] .... 4093.976590: xprt_prepare_transmit: RPC: 48 xprt_prepare_transmit
kworker/3:1H-145 [003] .... 4093.976604: xprt_transmit: RPC: 48 xprt_transmit(72)
kworker/3:1H-145 [003] .... 4093.976622: xs_tcp_send_request: RPC: xs_tcp_send_request(72) = 0
kworker/3:1H-145 [003] .... 4093.976623: xprt_transmit: RPC: 48 xmit complete
<idle>-0 [003] ..s. 4093.977040: xs_tcp_data_ready: RPC: xs_tcp_data_ready...
kworker/3:1H-145 [003] .... 4093.977151: xs_tcp_data_recv: RPC: xs_tcp_data_recv started
kworker/3:1H-145 [003] .... 4093.977153: xs_tcp_data_recv: RPC: reading TCP record fragment of length 24
kworker/3:1H-145 [003] .... 4093.977154: xs_tcp_data_recv: RPC: reading XID (4 bytes)
kworker/3:1H-145 [003] .... 4093.977155: xs_tcp_data_recv: RPC: reading request with XID 10c028fe
kworker/3:1H-145 [003] .... 4093.977156: xs_tcp_data_recv: RPC: reading CALL/REPLY flag (4 bytes)
kworker/3:1H-145 [003] .... 4093.977157: xs_tcp_data_recv: RPC: read reply XID 10c028fe
kworker/3:1H-145 [003] ..s. 4093.977158: xs_tcp_data_recv: RPC: XID 10c028fe read 16 bytes
kworker/3:1H-145 [003] ..s. 4093.977159: xs_tcp_data_recv: RPC: xprt = ffff8803b8c22000, tcp_copied = 24, tcp_offset = 24, tcp_reclen = 24
kworker/3:1H-145 [003] ..s. 4093.977160: xprt_complete_rqst: RPC: 48 xid 10c028fe complete (24 bytes received)
kworker/3:1H-145 [003] .... 4093.977161: xs_tcp_data_recv: RPC: xs_tcp_data_recv done
kworker/3:1H-145 [003] .... 4093.977167: xprt_release: RPC: 48 release request ffff8803bfe89c00

That "2049" port is what is used for all transferring of data.

When the FIN/ACK is sent by the client, the socket is destroyed (no more connections
can be used) but the port is not freed up, because it appears there's still an owner
attached to it. That means this port will *never* be used again. Even if the client
unmount the directory. That port is still in limbo.

When the FIN/ACK comes in, it goes into the TIME_WAIT state here:

kworker/3:1H-145 [003] ..s. 4394.370019: xs_tcp_state_change: RPC: xs_tcp_state_change client ffff8803b8c22000...
kworker/3:1H-145 [003] ..s. 4394.370022: xs_tcp_state_change: RPC: state 4 conn 1 dead 0 zapped 1 sk_shutdown 3
<idle>-0 [003] ..s. 4394.370352: xs_tcp_state_change: RPC: xs_tcp_state_change client ffff8803b8c22000...
<idle>-0 [003] ..s. 4394.370354: xs_tcp_state_change: RPC: state 5 conn 0 dead 0 zapped 1 sk_shutdown 3
<idle>-0 [003] ..s. 4394.370375: tcp_time_wait: moving xs_bind sock to time wait
<idle>-0 [003] ..s. 4394.370396: <stack trace>
=> tcp_data_queue
=> tcp_rcv_state_process
=> tcp_v4_inbound_md5_hash
=> tcp_v4_do_rcv
=> tcp_v4_rcv
=> ipv4_confirm
=> nf_iterate
=> ip_local_deliver_finish
=> ip_local_deliver
=> ip_local_deliver_finish
=> ip_rcv
=> packet_rcv
=> ip_rcv_finish
=> __netif_receive_skb_core
=> kmem_cache_alloc
=> netif_receive_skb_internal
=> br_pass_frame_up
=> br_flood
=> br_handle_frame
=> br_handle_frame_finish
=> enqueue_task_fair
=> br_handle_frame
=> br_handle_frame
=> find_busiest_group
=> __netif_receive_skb_core
=> inet_gro_receive
=> netif_receive_skb_internal
=> napi_gro_receive
=> e1000_clean_rx_irq
=> e1000_clean
=> net_rx_action
=> __do_softirq
=> irq_exit
=> do_IRQ
=> ret_from_intr
=> cpuidle_enter_state
=> cpuidle_enter_state
=> cpu_startup_entry
=> start_secondary

Then eventually, the socket is freed, and 'netstat' no longer shows it.

<idle>-0 [003] .Ns. 4454.371802: inet_bind_bucket_destroy: destroy 754 empty=0 ffff8803afc20e40
<idle>-0 [003] .Ns. 4454.371813: <stack trace>
=> inet_twsk_bind_unhash
=> inet_twsk_kill
=> tw_timer_handler
=> call_timer_fn
=> tw_timer_handler
=> run_timer_softirq
=> __do_softirq
=> irq_exit
=> do_IRQ
=> ret_from_intr
=> cpuidle_enter_state
=> cpuidle_enter_state
=> cpu_startup_entry
=> start_secondary

"empty=0" means the tb->owners associated with the port is not empty, and the
freeing of the port is skipped.

Now when I go and remount the directory from the client, the code finally cleans
up the port:

kworker/u32:0-25031 [000] .... 4544.674603: xprt_destroy: RPC: destroying transport ffff8803b8c22000
kworker/u32:0-25031 [000] .... 4544.674616: xs_destroy: RPC: xs_destroy xprt ffff8803b8c22000
kworker/u32:0-25031 [000] .... 4544.674617: xs_close: RPC: xs_close xprt ffff8803b8c22000
kworker/u32:0-25031 [000] ..s. 4544.674619: xs_tcp_state_change: RPC: xs_tcp_state_change client ffff8803b8c22000...
kworker/u32:0-25031 [000] ..s. 4544.674620: xs_tcp_state_change: RPC: state 7 conn 0 dead 0 zapped 1 sk_shutdown 3
kworker/u32:0-25031 [000] ..s. 4544.674621: xprt_disconnect_done: RPC: disconnected transport ffff8803b8c22000
kworker/u32:0-25031 [000] ..s. 4544.674621: xprt_disconnect_done: disconnect transport!

kworker/u32:0-25031 [000] ..s. 4544.674647: inet_bind_bucket_destroy: destroy 754 empty=1 ffff8803afc20e40
kworker/u32:0-25031 [000] ..s. 4544.674655: <stack trace>
=> inet_put_port
=> tcp_v4_destroy_sock
=> inet_csk_destroy_sock
=> tcp_close
=> inet_release
=> sock_release
=> xs_close
=> xs_destroy
=> xprt_switch_free
=> rpc_free_client
=> rpc_release_client
=> rpc_shutdown_client
=> nfsd4_process_cb_update.isra.14
=> update_curr
=> dequeue_task_fair
=> __switch_to
=> pick_next_task_fair
=> nfsd4_run_cb_work
=> process_one_work
=> worker_thread
=> worker_thread
=> kthread
=> ret_from_fork
=> kthread
kworker/u32:0-25031 [000] .... 4544.674660: xprt_disconnect_done: RPC: disconnected transport ffff8803b8c22000

Notice that "empty=1" now, and the port is freed.

Then it goes back doing everything all over again:

kworker/3:1H-145 [003] .... 4558.442458: xs_bind: RPC: xs_bind 4.136.255.255:973: ok (0)
kworker/3:1H-145 [003] .... 4558.442460: xs_tcp_setup_socket: RPC: worker connecting xprt ffff8803d7fd3800 via tcp to 192.168.23.22 (port 45075)
kworker/3:1H-145 [003] .... 4558.442496: xs_tcp_setup_socket: RPC: ffff8803d7fd3800 connect status 115 connected 0 sock state 2
<idle>-0 [002] ..s. 4558.442691: xs_tcp_state_change: RPC: xs_tcp_state_change client ffff8803d7fd3800...
<idle>-0 [002] ..s. 4558.442693: xs_tcp_state_change: RPC: state 1 conn 0 dead 0 zapped 1 sk_shutdown 0
kworker/2:1H-144 [002] .... 4558.442732: xprt_connect_status: RPC: 49 xprt_connect_status: retrying
kworker/2:1H-144 [002] .... 4558.442734: xprt_prepare_transmit: RPC: 49 xprt_prepare_transmit
kworker/2:1H-144 [002] .... 4558.442737: xprt_transmit: RPC: 49 xprt_transmit(72)
kworker/2:1H-144 [002] .... 4558.442753: xs_tcp_send_request: RPC: xs_tcp_send_request(72) = 0
kworker/2:1H-144 [002] .... 4558.442754: xprt_transmit: RPC: 49 xmit complete
nfsd-4382 [002] ..s. 4558.443203: xs_tcp_data_ready: RPC: xs_tcp_data_ready...
kworker/2:1H-144 [002] .... 4558.443227: xs_tcp_data_recv: RPC: xs_tcp_data_recv started
kworker/2:1H-144 [002] .... 4558.443229: xs_tcp_data_recv: RPC: reading TCP record fragment of length 24
kworker/2:1H-144 [002] .... 4558.443230: xs_tcp_data_recv: RPC: reading XID (4 bytes)
kworker/2:1H-144 [002] .... 4558.443231: xs_tcp_data_recv: RPC: reading request with XID e2e1dc21
kworker/2:1H-144 [002] .... 4558.443232: xs_tcp_data_recv: RPC: reading CALL/REPLY flag (4 bytes)
kworker/2:1H-144 [002] .... 4558.443233: xs_tcp_data_recv: RPC: read reply XID e2e1dc21
kworker/2:1H-144 [002] ..s. 4558.443235: xs_tcp_data_recv: RPC: XID e2e1dc21 read 16 bytes
kworker/2:1H-144 [002] ..s. 4558.443236: xs_tcp_data_recv: RPC: xprt = ffff8803d7fd3800, tcp_copied = 24, tcp_offset = 24, tcp_reclen = 24
kworker/2:1H-144 [002] ..s. 4558.443237: xprt_complete_rqst: RPC: 49 xid e2e1dc21 complete (24 bytes received)
kworker/2:1H-144 [002] .... 4558.443238: xs_tcp_data_recv: RPC: xs_tcp_data_recv done
kworker/2:1H-144 [002] .... 4558.443246: xprt_release: RPC: 49 release request ffff8800dba14800
kworker/u32:1-13473 [003] .... 4558.496850: xprt_destroy: RPC: destroying transport ffff8803d7fd3800
kworker/u32:1-13473 [003] .... 4558.496860: xs_destroy: RPC: xs_destroy xprt ffff8803d7fd3800
kworker/u32:1-13473 [003] .... 4558.496861: xs_close: RPC: xs_close xprt ffff8803d7fd3800
kworker/u32:1-13473 [003] ..s. 4558.496888: xs_tcp_state_change: RPC: xs_tcp_state_change client ffff8803d7fd3800...
kworker/u32:1-13473 [003] ..s. 4558.496889: xs_tcp_state_change: RPC: state 4 conn 1 dead 0 zapped 1 sk_shutdown 3
kworker/u32:1-13473 [003] .... 4558.496894: xprt_disconnect_done: RPC: disconnected transport ffff8803d7fd3800
kworker/u32:1-13473 [003] .... 4558.496895: xprt_disconnect_done: disconnect transport!

Where 973 is the port that gets added and disconnected right away (and freed)

kworker/3:1H-145 [003] .... 4558.496991: xs_bind: RPC: xs_bind 4.136.255.255:688: ok (0)
kworker/3:1H-145 [003] .... 4558.496993: xs_tcp_setup_socket: RPC: worker connecting xprt ffff8803bb889000 via tcp to 192.168.23.22 (port 45075)
kworker/3:1H-145 [003] .... 4558.497024: xs_tcp_setup_socket: RPC: ffff8803bb889000 connect status 115 connected 0 sock state 2
<idle>-0 [002] .Ns. 4558.497171: xs_tcp_state_change: RPC: xs_tcp_state_change client ffff8803bb889000...
<idle>-0 [002] .Ns. 4558.497173: xs_tcp_state_change: RPC: state 1 conn 0 dead 0 zapped 1 sk_shutdown 0
kworker/2:1H-144 [002] .... 4558.497196: xprt_connect_status: RPC: 50 xprt_connect_status: retrying
kworker/2:1H-144 [002] .... 4558.497197: xprt_prepare_transmit: RPC: 50 xprt_prepare_transmit
kworker/2:1H-144 [002] .... 4558.497199: xprt_transmit: RPC: 50 xprt_transmit(72)
kworker/2:1H-144 [002] .... 4558.497210: xs_tcp_send_request: RPC: xs_tcp_send_request(72) = 0
kworker/2:1H-144 [002] .... 4558.497210: xprt_transmit: RPC: 50 xmit complete
<idle>-0 [002] ..s. 4558.497475: xs_tcp_data_ready: RPC: xs_tcp_data_ready...
kworker/2:1H-144 [002] .... 4558.497569: xs_tcp_data_recv: RPC: xs_tcp_data_recv started
kworker/2:1H-144 [002] .... 4558.497571: xs_tcp_data_recv: RPC: reading TCP record fragment of length 24
kworker/2:1H-144 [002] .... 4558.497571: xs_tcp_data_recv: RPC: reading XID (4 bytes)
kworker/2:1H-144 [002] .... 4558.497572: xs_tcp_data_recv: RPC: reading request with XID a4418f34
kworker/2:1H-144 [002] .... 4558.497573: xs_tcp_data_recv: RPC: reading CALL/REPLY flag (4 bytes)
kworker/2:1H-144 [002] .... 4558.497573: xs_tcp_data_recv: RPC: read reply XID a4418f34
kworker/2:1H-144 [002] ..s. 4558.497574: xs_tcp_data_recv: RPC: XID a4418f34 read 16 bytes
kworker/2:1H-144 [002] ..s. 4558.497575: xs_tcp_data_recv: RPC: xprt = ffff8803bb889000, tcp_copied = 24, tcp_offset = 24, tcp_reclen = 24
kworker/2:1H-144 [002] ..s. 4558.497575: xprt_complete_rqst: RPC: 50 xid a4418f34 complete (24 bytes received)
kworker/2:1H-144 [002] .... 4558.497577: xs_tcp_data_recv: RPC: xs_tcp_data_recv done
kworker/2:1H-144 [002] .... 4558.497581: xprt_release: RPC: 50 release request ffff8800db28d800

And 688 will be the port that becomes the new hidden port.

Thus it looks like there's something that is not cleaning up ports properly. There's
some timing issues here.

Any thoughts why. Because this is obviously wrong, and not only is it wasting a port
and memory to store it, but it's causing rkhunter to report it, because it's one of
the things that rootkits do.

-- Steve

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