cilium / cilium / 12123
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coverage: 46.073% (+0.02%) from 46.054%
12123

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brb 
bpf, nodeport: fix CT GC race where syn/ack reply gets dropped locally

While testing BPF nodeport with local backend under stress, I've noticed that
once in every several thousand cases the SYN/ACK is 'stuck' and not being pushed
back to the remote node.

'Odd' case seen:

  [...]
  <- stack flow 0x65f91604 identity 0->0 state new ifindex eno1 orig-ip 0.0.0.0: 192.168.1.120:58490 -> 192.168.1.125:30000 tcp SYN
  <- host flow 0x65f91604 identity 2->0 state new ifindex eno1 orig-ip 0.0.0.0: 192.168.1.120:58490 -> 10.11.14.171:80 tcp SYN
  -> endpoint 893 flow 0x65f91604 identity 2->16777217 state established ifindex lxc962bf03db31a orig-ip 192.168.1.120: 192.168.1.120:58490 -> 10.11.14.171:80 tcp SYN
  <- endpoint 893 flow 0xed432cf identity 16777217->0 state new ifindex 0 orig-ip 0.0.0.0: 10.11.14.171:80 -> 192.168.1.120:58490 tcp SYN, ACK
  -> stack flow 0xed432cf identity 16777217->2 state reply ifindex 0 orig-ip 0.0.0.0: 10.11.14.171:80 -> 192.168.1.120:58490 tcp SYN, ACK  <---- BUGGY
  [...]

'Regular' case:

  [...]
  <- stack flow 0xe5afda01 identity 0->0 state new ifindex eno1 orig-ip 0.0.0.0: 192.168.1.120:58470 -> 192.168.1.125:30000 tcp SYN
  <- host flow 0xe5afda01 identity 2->0 state new ifindex eno1 orig-ip 0.0.0.0: 192.168.1.120:58470 -> 10.11.14.171:80 tcp SYN
  -> endpoint 893 flow 0xe5afda01 identity 2->16777217 state established ifindex lxc962bf03db31a orig-ip 192.168.1.120: 192.168.1.120:58470 -> 10.11.14.171:80 tcp SYN
  <- endpoint 893 flow 0xdb0f605a identity 16777217->0 state new ifindex 0 orig-ip 0.0.0.0: 10.11.14.171:80 -> 192.168.1.120:58470 tcp SYN, ACK
  <- stack flow 0xe5afda01 identity 0->0 state new ifindex eno1 orig-ip 0.0.0.0: 192.168.1.120:58470 -> 192.168.1.125:30000 tcp ACK  <---- OK
  <- stack flow 0xe5afda01 identity 0->0 state new ifindex eno1 orig-ip 0.0.0.0: 192.168.1.120:58470 -> 192.168.1.125:30000 tcp ACK
  <- host flow 0xe5afda01 identity 2->0 state new ifindex eno1 orig-ip 0.0.0.0: 192.168.1.120:58470 -> 1... (continued)

26411 of 57324 relevant lines covered (46.07%)

1571.76 hits per line

Jobs
ID Job ID Ran Files Coverage
1 12123.1 0
46.07
 Travis Job 12123.1
Source Files on build 12123
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