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selftests: mptcp_connect.sh: disconnect test timed out #499

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matttbe opened this issue Jun 10, 2024 · 4 comments
Open

selftests: mptcp_connect.sh: disconnect test timed out #499

matttbe opened this issue Jun 10, 2024 · 4 comments
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bug selftests

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@matttbe
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matttbe commented Jun 10, 2024

This issue has been seen on NIPA, with a debug kernel config: the disconnect test in v4 with MPTCP on both side failed with a timeout:

# INFO: disconnect
# 63 ns1 MPTCP -> ns1 (10.0.1.1:20001      ) MPTCP     copyfd_io_poll: poll timed out (events: POLLIN 1, POLLOUT 4)
# copyfd_io_poll: poll timed out (events: POLLIN 1, POLLOUT 4)
# main_loop_s: timed out
# (duration 60607ms) [FAIL] client exit code 2, server 2
# 
# netns ns1-H3axWx socket stat for 20001:
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Netid State      Recv-Q Send-Q Local Address:Port  Peer Address:Port                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
# tcp   ESTAB      0      0           10.0.1.1:20001     10.0.1.1:49604 ino:0 sk:1006 cgroup:unreachable:1 <->
#  ts sack cubic wscale:7,7 rto:201 rtt:0.302/0.1 ato:40 mss:32768 pmtu:65535 rcvmss:32740 advmss:65483 cwnd:10 bytes_sent:1223524 bytes_acked:1223524 bytes_received:1217280 segs_out:89 segs_in:91 data_segs_out:56 data_segs_in:57 send 8680264901bps lastsnd:60772 lastrcv:60771 lastack:60771 pacing_rate 17353347120bps delivery_rate 2978909088bps delivered:57 busy:13ms rcv_rtt:0.779 rcv_space:65483 rcv_ssthresh:65536 minrtt:0.083 tcp-ulp-mptcp flags:Mec token:0000(id:0)/719a9338(id:0) seq:a2cdd16f5e1643f8 sfseq:1292c9 ssnoff:b83253cc maplen:38
# mptcp FIN-WAIT-1 0      0           10.0.1.1:20001     10.0.1.1:49604 timer:(keepalive,59sec,0) ino:0 sk:1007 cgroup:unreachable:1 ---
#  subflows_max:2 remote_key token:719a9338 write_seq:11861448483224381307 snd_una:11861448483222639326 rcv_nxt:11731262880620102704 bytes_sent:1223524 bytes_received:1217280 bytes_acked:1223524 subflows_total:1 last_data_sent:60783 last_data_recv:60782 last_ack_recv:60782                                                                                                                                                                                                                                                       
# TcpActiveOpens                  1                  0.0
# TcpPassiveOpens                 1                  0.0
# TcpInSegs                       181                0.0
# TcpOutSegs                      180                0.0
# TcpRetransSegs                  1                  0.0
# TcpExtDelayedACKLost            1                  0.0
# TcpExtTCPPureAcks               66                 0.0
# TcpExtTCPLossProbes             1                  0.0
# TcpExtTCPDSACKOldSent           1                  0.0
# TcpExtTCPDSACKRecv              1                  0.0
# TcpExtTCPFromZeroWindowAdv      30                 0.0
# TcpExtTCPToZeroWindowAdv        32                 0.0
# TcpExtTCPWantZeroWindowAdv      9                  0.0
# TcpExtTCPOrigDataSent           112                0.0
# TcpExtTCPDelivered              114                0.0
# TcpExtTCPDSACKRecvSegs          1                  0.0
# MPTcpExtMPCapableSYNRX          1                  0.0
# MPTcpExtMPCapableSYNTX          1                  0.0
# MPTcpExtMPCapableSYNACKRX       1                  0.0
# MPTcpExtMPCapableACKRX          1                  0.0
# 
# netns ns1-H3axWx socket stat for 20001:
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Netid State      Recv-Q Send-Q Local Address:Port  Peer Address:Port                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
# tcp   ESTAB      0      0           10.0.1.1:49604     10.0.1.1:20001 ino:0 sk:3005 cgroup:unreachable:1 <->
#  ts sack cubic wscale:7,7 rto:201 rtt:0.723/0.563 ato:40 mss:32768 pmtu:65535 rcvmss:32740 advmss:65483 cwnd:10 bytes_sent:1217336 bytes_retrans:56 bytes_acked:1217281 bytes_received:1223524 segs_out:91 segs_in:90 data_segs_out:57 data_segs_in:56 send 3625781466bps lastsnd:61194 lastrcv:61194 lastack:61193 pacing_rate 7247803696bps delivery_rate 918728968bps delivered:58 busy:24ms retrans:0/1 dsack_dups:1 rcv_rtt:0.53 rcv_space:65495 rcv_ssthresh:65536 minrtt:0.132 tcp-ulp-mptcp flags:Mmec token:0000(id:0)/56769fbe(id:0) seq:a49c548d0414d2a6 sfseq:12ab2d ssnoff:c291bfb0 maplen:38
# mptcp FIN-WAIT-1 0      0           10.0.1.1:49604     10.0.1.1:20001 timer:(keepalive,28sec,0) ino:0 sk:3006 cgroup:unreachable:1 ---
#  subflows_max:2 remote_key token:56769fbe write_seq:11731262880621834545 snd_una:11731262880620102704 rcv_nxt:11861448483222639326 bytes_sent:1217280 bytes_received:1223524 bytes_acked:1217280 subflows_total:1 last_data_sent:61195 last_data_recv:61195 last_ack_recv:61194                                                                                                                                                                                                                                                                                                 
# 
# 64 ns1 MPTCP -> ns1 (dead:beef:1::1:20002) MPTCP     (duration   763ms) [ OK ]
# 65 ns1 MPTCP -> ns1 (dead:beef:1::1:20003) TCP       (duration   584ms) [ OK ]
# 66 ns1 TCP   -> ns1 (dead:beef:1::1:20004) MPTCP     (duration   569ms) [ OK ]
# [FAIL] Tests of the full disconnection have failed

From: contest - stdout

Note that the test has been re-run, and the test passed the second time.
@matttbe
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matttbe commented Jun 18, 2024 •
edited
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It looks like we just got it a second time (after 64 other attempts without issues):

# INFO: disconnect
# 63 ns1 MPTCP -> ns1 (10.0.1.1:20001      ) MPTCP     copyfd_io_poll: poll timed out (events: POLLIN 1, POLLOUT 4)
# copyfd_io_poll: poll timed out (events: POLLIN 1, POLLOUT 4)
# main_loop_s: timed out
# (duration 60609ms) [FAIL] client exit code 2, server 2
# 
# netns ns1-P3Kvbz socket stat for 20001:
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Netid State      Recv-Q Send-Q Local Address:Port  Peer Address:Port                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
# tcp   ESTAB      0      0           10.0.1.1:20001     10.0.1.1:43290 ino:0 sk:1007 cgroup:unreachable:1 <->
#  ts sack cubic wscale:7,7 rto:201 rtt:0.439/0.265 ato:40 mss:32768 pmtu:65535 rcvmss:32740 advmss:65483 cwnd:10 bytes_sent:1688748 bytes_acked:1688748 bytes_received:1570404 segs_out:131 segs_in:123 data_segs_out:94 data_segs_in:88 send 5971389522bps lastsnd:60804 lastrcv:60804 lastack:60803 pacing_rate 11929192256bps delivery_rate 714288824bps delivered:95 busy:20ms rcv_rtt:0.8 rcv_space:65483 rcv_ssthresh:65536 minrtt:0.085 tcp-ulp-mptcp flags:Mec token:0000(id:0)/e7baab78(id:0) seq:d8de468b32ba23f7 sfseq:17f62d ssnoff:d63f6e86 maplen:38
# mptcp FIN-WAIT-1 0      0           10.0.1.1:20001     10.0.1.1:43290 timer:(keepalive,59sec,0) ino:0 sk:3004 cgroup:unreachable:1 ---
#  subflows_max:2 remote_key token:e7baab78 write_seq:12549881151337605123 snd_una:12549881151335869614 rcv_nxt:15627005320687658031 bytes_sent:1688748 bytes_received:1570404 bytes_acked:1688748 subflows_total:1 last_data_sent:60815 last_data_recv:60815 last_ack_recv:60814                                                                                                                                                                                                                                                        
# TcpActiveOpens                  1                  0.0
# TcpPassiveOpens                 1                  0.0
# TcpInSegs                       255                0.0
# TcpOutSegs                      255                0.0
# TcpExtTCPPureAcks               71                 0.0
# TcpExtTCPFromZeroWindowAdv      36                 0.0
# TcpExtTCPToZeroWindowAdv        38                 0.0
# TcpExtTCPWantZeroWindowAdv      19                 0.0
# TcpExtTCPOrigDataSent           182                0.0
# TcpExtTCPDelivered              183                0.0
# MPTcpExtMPCapableSYNRX          1                  0.0
# MPTcpExtMPCapableSYNTX          1                  0.0
# MPTcpExtMPCapableSYNACKRX       1                  0.0
# MPTcpExtMPCapableACKRX          1                  0.0
# 
# netns ns1-P3Kvbz socket stat for 20001:
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Netid State      Recv-Q Send-Q Local Address:Port  Peer Address:Port                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
# tcp   ESTAB      0      0           10.0.1.1:43290     10.0.1.1:20001 ino:0 sk:3005 cgroup:unreachable:1 <->
#  ts sack cubic wscale:7,7 rto:201 rtt:0.381/0.214 ato:40 mss:32768 pmtu:65535 rcvmss:32740 advmss:65483 cwnd:10 bytes_sent:1570404 bytes_acked:1570405 bytes_received:1688748 segs_out:123 segs_in:132 data_segs_out:88 data_segs_in:94 send 6880419948bps lastsnd:61218 lastrcv:61218 lastack:61218 pacing_rate 13751816392bps delivery_rate 2148721304bps delivered:89 busy:22ms rcv_rtt:0.793 rcv_space:65495 rcv_ssthresh:65536 minrtt:0.075 tcp-ulp-mptcp flags:Mmec token:0000(id:0)/698c1c2a(id:0) seq:ae2a226a3ebeac76 sfseq:19c475 ssnoff:38f53772 maplen:38
# mptcp FIN-WAIT-1 0      0           10.0.1.1:43290     10.0.1.1:20001 timer:(keepalive,28sec,0) ino:0 sk:3006 cgroup:unreachable:1 ---
#  subflows_max:2 remote_key token:698c1c2a write_seq:15627005320689413580 snd_una:15627005320687658031 rcv_nxt:12549881151335869614 bytes_sent:1570404 bytes_received:1688748 bytes_acked:1570404 subflows_total:1 last_data_sent:61221 last_data_recv:61220 last_ack_recv:61220                                                                                                                                                                                                                                                            
# 
# 64 ns1 MPTCP -> ns1 (dead:beef:1::1:20002) MPTCP     (duration   942ms) [ OK ]
# 65 ns1 MPTCP -> ns1 (dead:beef:1::1:20003) TCP       (duration   750ms) [ OK ]
# 66 ns1 TCP   -> ns1 (dead:beef:1::1:20004) MPTCP     (duration   718ms) [ OK ]
# [FAIL] Tests of the full disconnection have failed

stdout

@matttbe
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matttbe commented Jul 5, 2024

The netdev CI might have got the same issues, with other subtests:

# INFO: with peek mode: saveWithPeek
# 45 ns1 MPTCP -> ns1 (10.0.1.1:10042      ) MPTCP     copyfd_io_poll: poll timed out (events: POLLIN 1, POLLOUT 4)
# copyfd_io_poll: poll timed out (events: POLLIN 1, POLLOUT 4)
# (duration 30719ms) [FAIL] client exit code 2, server 0
# 
# netns ns1-HxJyo5 socket stat for 10042:
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Netid State      Recv-Q Send-Q Local Address:Port  Peer Address:Port                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
# tcp   ESTAB      0      0           10.0.1.1:10042     10.0.1.1:51742 ino:0 sk:1 cgroup:unreachable:1 <->
#  ts sack cubic wscale:7,7 rto:201 rtt:0.849/0.84 ato:40 mss:32768 pmtu:65535 rcvmss:32740 advmss:65483 cwnd:10 bytes_sent:1481644 bytes_acked:1481644 bytes_received:1618176 segs_out:119 segs_in:125 data_segs_out:77 data_segs_in:92 send 3087679623bps lastsnd:31359 lastrcv:31358 lastack:31358 pacing_rate 6172632816bps delivery_rate 1332935592bps delivered:78 busy:29ms sndbuf_limited:1ms(3.4%) rcv_rtt:0.668 rcv_space:65483 rcv_ssthresh:65536 minrtt:0.076 tcp-ulp-mptcp flags:Mec token:0000(id:0)/a408546b(id:0) seq:74497f2de7d21852 sfseq:18b0c9 ssnoff:ac520205 maplen:38
# mptcp FIN-WAIT-1 0      0           10.0.1.1:10042     10.0.1.1:51742 timer:(keepalive,58sec,0) ino:0 sk:2 cgroup:unreachable:1 ---
#  subflows_max:2 remote_key token:a408546b write_seq:12280206055032317685 snd_una:12280206055030563488 rcv_nxt:8379368416839080074 bytes_sent:1481644 bytes_received:1618176 bytes_acked:1481644 subflows_total:1 last_data_sent:31515 last_data_recv:31514 last_ack_recv:31514                                                                                                                                                                                                                                                                                   
# TcpActiveOpens                  1                  0.0
# TcpPassiveOpens                 1                  0.0
# TcpInSegs                       245                0.0
# TcpOutSegs                      245                0.0
# TcpExtTCPPureAcks               73                 0.0
# TcpExtTCPBacklogCoalesce        1                  0.0
# TcpExtTCPFromZeroWindowAdv      30                 0.0
# TcpExtTCPToZeroWindowAdv        32                 0.0
# TcpExtTCPWantZeroWindowAdv      24                 0.0
# TcpExtTCPOrigDataSent           169                0.0
# TcpExtTCPDelivered              170                0.0
# MPTcpExtMPCapableSYNRX          1                  0.0
# MPTcpExtMPCapableSYNTX          1                  0.0
# MPTcpExtMPCapableSYNACKRX       1                  0.0
# MPTcpExtMPCapableACKRX          1                  0.0
# MPTcpExtRcvPruned               2                  0.0
# 
# netns ns1-HxJyo5 socket stat for 10042:
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Netid State      Recv-Q Send-Q Local Address:Port  Peer Address:Port                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
# tcp   ESTAB      0      0           10.0.1.1:51742     10.0.1.1:10042 ino:0 sk:1001 cgroup:unreachable:1 <->
#  ts sack cubic wscale:7,7 rto:201 rtt:0.383/0.154 ato:40 mss:32768 pmtu:65535 rcvmss:32740 advmss:65483 cwnd:10 bytes_sent:1618176 bytes_acked:1618177 bytes_received:1481644 segs_out:125 segs_in:120 data_segs_out:92 data_segs_in:77 send 6844490862bps lastsnd:32080 lastrcv:32081 lastack:32079 pacing_rate 13662228008bps delivery_rate 2259862064bps delivered:93 busy:25ms rcv_rtt:1.276 rcv_space:65495 rcv_ssthresh:65536 minrtt:0.092 tcp-ulp-mptcp flags:Mmec token:0000(id:0)/91162be3(id:0) seq:aa6c0e57feb2a268 sfseq:169b75 ssnoff:a6e73145 maplen:38
# mptcp FIN-WAIT-1 0      0           10.0.1.1:51742     10.0.1.1:10042 timer:(keepalive,57sec,0) ino:0 sk:1002 cgroup:unreachable:1 ---
#  subflows_max:2 remote_key token:91162be3 write_seq:8379368416840837003 snd_una:8379368416839080074 rcv_nxt:12280206055030563488 bytes_sent:1618176 bytes_received:1481644 bytes_acked:1618176 subflows_total:1 last_data_sent:32085 last_data_recv:32086 last_ack_recv:32084                                                                                                                                                                                                                                                              
# 
# 46 ns1 MPTCP -> ns1 (dead:beef:1::1:10043) MPTCP     (duration   704ms) [ OK ]

stdout

Here as well the MPTCP connection is in FIN-WAIT-1, but the subflow is still in ESTAB mode.

Same here:

# 01 New MPTCP socket can be blocked via sysctl                           [ OK ]
# 02 Validating network environment with pings                            [ OK ]
# INFO: Using loss of 0.36% delay 40 ms reorder 97% 58% with delay 10ms on ns3eth4
# 03 ns1 MPTCP -> ns1 (10.0.1.1:10000      ) MPTCP     (duration   560ms) [ OK ]
# 04 ns1 MPTCP -> ns1 (10.0.1.1:10001      ) TCP       (duration   502ms) [ OK ]
# 05 ns1 TCP   -> ns1 (10.0.1.1:10002      ) MPTCP     (duration   513ms) [ OK ]
# 06 ns1 MPTCP -> ns1 (dead:beef:1::1:10003) MPTCP     copyfd_io_poll: poll timed out (events: POLLIN 1, POLLOUT 0)
# copyfd_io_poll: poll timed out (events: POLLIN 1, POLLOUT 4)
# (duration 30580ms) [FAIL] client exit code 2, server 0
# 
# netns ns1-SK0yn5 socket stat for 10003:
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Netid State      Recv-Q Send-Q    Local Address:Port      Peer Address:Port                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
# tcp   ESTAB      0      0      [dead:beef:1::1]:10003 [dead:beef:1::1]:56948 ino:0 sk:3005 cgroup:unreachable:1 <->
#  ts sack cubic wscale:7,7 rto:201 rtt:0.264/0.026 ato:40 mss:32768 pmtu:65536 rcvmss:32740 advmss:65464 cwnd:10 bytes_sent:2143092 bytes_acked:2143092 bytes_received:2435968 segs_out:179 segs_in:179 data_segs_out:124 data_segs_in:132 send 9929696970bps lastsnd:30754 lastrcv:30753 lastack:30753 pacing_rate 19821852544bps delivery_rate 2870189776bps delivered:125 busy:23ms sndbuf_limited:6ms(26.1%) rcv_rtt:0.485 rcv_space:65464 rcv_ssthresh:65536 minrtt:0.073 tcp-ulp-mptcp flags:Mec token:0000(id:0)/f106dcf3(id:0) seq:92b25b83905f79b8 sfseq:252b49 ssnoff:18e456a2 maplen:38
# mptcp FIN-WAIT-1 0      0      [dead:beef:1::1]:10003 [dead:beef:1::1]:56948 timer:(keepalive,59sec,0) ino:0 sk:3006 cgroup:unreachable:1 ---
#  subflows_max:2 remote_key token:f106dcf3 write_seq:10047283554366318455 snd_una:10047283554364572746 rcv_nxt:10570611896012995056 bytes_sent:2143092 bytes_received:2435968 bytes_acked:2143092 subflows_total:1 last_data_sent:30758 last_data_recv:30757 last_ack_recv:30757                                                                                                                                                                                                                                                                                        
# TcpActiveOpens                  1                  0.0
# TcpPassiveOpens                 1                  0.0
# TcpInSegs                       359                0.0
# TcpOutSegs                      358                0.0
# TcpRetransSegs                  1                  0.0
# TcpExtDelayedACKLost            1                  0.0
# TcpExtTCPPureAcks               101                0.0
# TcpExtTCPLossProbes             1                  0.0
# TcpExtTCPDSACKOldSent           1                  0.0
# TcpExtTCPDSACKRecv              1                  0.0
# TcpExtTCPFromZeroWindowAdv      45                 0.0
# TcpExtTCPToZeroWindowAdv        47                 0.0
# TcpExtTCPWantZeroWindowAdv      61                 0.0
# TcpExtTCPOrigDataSent           255                0.0
# TcpExtTCPDelivered              257                0.0
# TcpExtTCPDSACKRecvSegs          1                  0.0
# MPTcpExtMPCapableSYNRX          1                  0.0
# MPTcpExtMPCapableSYNTX          1                  0.0
# MPTcpExtMPCapableSYNACKRX       1                  0.0
# MPTcpExtMPCapableACKRX          1                  0.0
# MPTcpExtRcvPruned               6                  0.0
# 
# netns ns1-SK0yn5 socket stat for 10003:
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Failed to find cgroup2 mount
# Netid State      Recv-Q Send-Q    Local Address:Port      Peer Address:Port                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
# tcp   ESTAB      0      0      [dead:beef:1::1]:56948 [dead:beef:1::1]:10003 ino:0 sk:6 cgroup:unreachable:1 <->
#  ts sack cubic wscale:7,7 rto:201 rtt:0.385/0.262 ato:40 mss:32768 pmtu:65536 rcvmss:32740 advmss:65464 cwnd:10 bytes_sent:2436024 bytes_retrans:56 bytes_acked:2435969 bytes_received:2143092 segs_out:179 segs_in:180 data_segs_out:132 data_segs_in:124 send 6808935065bps lastsnd:31181 lastrcv:31182 lastack:31181 pacing_rate 13586990600bps delivery_rate 4737542168bps delivered:133 busy:32ms retrans:0/1 dsack_dups:1 rcv_rtt:0.707 rcv_space:65476 rcv_ssthresh:65536 minrtt:0.072 tcp-ulp-mptcp flags:Mmec token:0000(id:0)/d22cfecc(id:0) seq:8b6f1f28ef864412 sfseq:20b33d ssnoff:708ec62c maplen:38
# mptcp FIN-WAIT-1 0      0      [dead:beef:1::1]:56948 [dead:beef:1::1]:10003 timer:(keepalive,58sec,0) ino:0 sk:3007 cgroup:unreachable:1 ---
#  subflows_max:2 remote_key token:d22cfecc write_seq:10570611896014170509 snd_una:10570611896012995056 rcv_nxt:10047283554364572746 bytes_sent:2435968 bytes_received:2143092 bytes_acked:2435968 subflows_total:1 last_data_sent:31185 last_data_recv:31185 last_ack_recv:31184                                                                                                                                                                                                                                                                                                      
# 
# [FAIL] Could not even run loopback v6 test
# Time: 78 seconds

stdout

Note that all failed tests are using the same IP for both the client and the server, maybe a link?

@pabeni
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pabeni commented Jul 5, 2024

I think (I'm reasonably sure) this last batch of failures have a different root cause: there is a MPTcpExtRcvPruned even (packet drop after sending the mptcp-level ack due to memory limits) and the transfer is partial.

I think/fear addressing this later issue for good requires a significant refactor

@matttbe
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matttbe commented Jul 26, 2024

Our CI (first time) just found a similar issue with a debug kernel config

# INFO: disconnect
# 63 ns1 MPTCP -> ns1 (10.0.1.1:20001      ) MPTCP     (duration   407ms) [ OK ]
# 64 ns1 MPTCP -> ns1 (10.0.1.1:20002      ) TCP       (duration   277ms) [ OK ]
# 65 ns1 TCP   -> ns1 (10.0.1.1:20003      ) MPTCP     (duration   252ms) [ OK ]
# 66 ns1 MPTCP -> ns1 (dead:beef:1::1:20004) MPTCP     (duration   444ms) [ OK ]
# 67 ns1 MPTCP -> ns1 (dead:beef:1::1:20005) TCP       main_loop_s: timed out
# (duration 61069ms) [FAIL] client exit code 124, server 2
# 
# netns ns1-bLdL3I socket stat for 20005:
# Netid State     Recv-Q Send-Q    Local Address:Port      Peer Address:Port                                     
# tcp   TIME-WAIT 0      0      [dead:beef:1::1]:20005 [dead:beef:1::1]:41764 timer:(timewait,,0) ino:0 sk:212d
# 	
# tcp   TIME-WAIT 0      0      [dead:beef:1::1]:20005 [dead:beef:1::1]:41750 timer:(timewait,,0) ino:0 sk:212e
# 	
# TcpActiveOpens                  2                  0.0
# TcpPassiveOpens                 2                  0.0
# TcpInSegs                       1028               0.0
# TcpOutSegs                      1029               0.0
# TcpExtTW                        2                  0.0
# TcpExtTCPHPHits                 3                  0.0
# TcpExtTCPPureAcks               153                0.0
# TcpExtTCPSACKReorder            1                  0.0
# TcpExtTCPSackShiftFallback      1                  0.0
# TcpExtTCPOFOQueue               1                  0.0
# TcpExtTCPFromZeroWindowAdv      1                  0.0
# TcpExtTCPToZeroWindowAdv        1                  0.0
# TcpExtTCPWantZeroWindowAdv      67                 0.0
# TcpExtTCPOrigDataSent           872                0.0
# TcpExtTCPHystartTrainDetect     1                  0.0
# TcpExtTCPHystartTrainCwnd       16                 0.0
# TcpExtTCPDelivered              874                0.0
# MPTcpExtMPCapableSYNTX          2                  0.0
# MPTcpExtMPCapableFallbackSYNACK 2                  0.0
# 
# netns ns1-bLdL3I socket stat for 20005:
# Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
# 
# [FAIL] Tests of the full disconnection have failed

But here, there was a fallback to TCP! (MPTCP → TCP)

https://github.com/multipath-tcp/mptcp_net-next/actions/runs/10109852800

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@matttbe @pabeni