[Mainline-Build 2704]: one flow is stuck and never deleted

[alok kumar]

one of the reverse flow is stuck with Action F-

   403484<=>458048 2002:1::6:9002 6 (1)
                         2002:2::3:10002
    (K(nh):34, Action:F, Flags:, TCP:Sr, S(nh):34, Statistics:0/0 UdpSrcPort 64185

for sometime I saw forward flow in HOLD state(but unlinked with reverse flow) and deleted after sometime(may be flow aged out):

   403484<=>458048 2002:1::6:9002 6 (1)
                         2002:2::3:10002
    (K(nh):34, Action:F, Flags:, TCP:Sr, S(nh):34, Statistics:0/0 UdpSrcPort 64185

   450272 :::0 0 (1)
                         :::0
    (K(nh):0, Action:D(Unknown), Flags:E, S(nh):0, Statistics:5/371 UdpSrcPort 0

   458048 2002:2::3:10002 6 (1)
                         2002:1::6:9002
    (K(nh):34, Action:H, Flags:, TCP:S, S(nh):0, Statistics:17/1360 UdpSrcPort 0

root@nodec62:~# flow -l --show-evicted | grep 458048 -A3 ------> grep with HOLD flow index(which got deleted after sometime)
   403484<=>458048 2002:1::6:9002 6 (1)
                         2002:2::3:10002
    (K(nh):34, Action:F, Flags:, TCP:Sr, S(nh):34, Statistics:0/0 UdpSrcPort 64185

test steps:
test was to try to create tcp session to non-existing port(reset will be sent from other end) in loop.

on VM 2002:2::3 ran below cmd:
"while true;do echo hi | nc -6 2002:1::6 9002 -p 10002 -vv -q 2000;done"

[alok kumar (kalok)]

setup Info :

env.roledefs = {
    'all': [host1,host2,host3,host4],
    'cfgm': [host1],
    'openstack':[host2],
    'control': [host1,host2],
    'compute': [host3,host4],
    'collector': [host1,host2],
    'webui': [host1],
    'database': [host1],
    'build': [host_build],
}

env.hostnames = {
    'all': ['nodec64', 'nodeg18', 'nodec62', 'nodec12']

[alok kumar (kalok)]

one more flow to the existing port 22 in HOLD state -

root@nodec12:~# flow -l --show-evicted | grep 2002:2::3 -A2 -B2 | grep 2002:1::6 -A2 -B2

   388832 2002:2::3:10002 6 (3)
                         2002:1::6:22
    (K(nh):56, Action:H, Flags:, TCP:S, S(nh):0, Statistics:6/564 UdpSrcPort 0

[alok kumar (kalok)]

3 new flows stuck. This happened when Fat flow was added for TCP port 22 and remains forever even when Fat flow config is removed.

root@nodec12:~# flow -l --show-evicted| grep :22 -A2 -B1

   192316<=>289976 1.1.1.4:22 6 (1)
                         1.1.1.3:0
    (K(nh):21, Action:D(Unknown), Flags:, TCP:Sr, S(nh):21, Statistics:0/0 UdpSrcPort 55055
--

   220516<=>394524 1.1.1.3:22 6 (1)
                         1.1.1.2:33519
    (K(nh):16, Action:F, Flags:, TCP:, S(nh):16, Statistics:4/904 UdpSrcPort 52355
--

   384220<=>86728 1.1.1.4:22 6 (1)
                         1.1.1.2:44004
    (K(nh):21, Action:F, Flags:, TCP:, S(nh):21, Statistics:9/594 UdpSrcPort 55335

[alok kumar (kalok)]

1 more flow stuck with HOLD state.this is also with Fat flow.

root@nodec12:~# flow -l --show-evicted| grep Action:H -B2
   222136 1.1.1.4:22 6 (1)
                         1.1.1.3:36667
    (K(nh):21, Action:H, Flags:, TCP:F, S(nh):0, Statistics:9/594 UdpSrcPort 0