ubuntu_kernel_selftests/net:fib_rule_tests.sh fail dsfield connect tests

[Andrei Gherzan]

This was seen while testing the lunar:linux-aws 6.2.0-1005.5 release where some dsfield connect tests fail.

Full logs from http://10.246.75.167/2023.05.15/lunar/linux-aws/6.2.0-1005.5/sru-aws-aws-a1.medium-ubuntu_kernel_selftests-log.html#net:fib_rule_tests.sh-start:

Running 'make run_tests -C net TEST_PROGS=fib_rule_tests.sh TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net'
TAP version 13
1..1
# selftests: net: fib_rule_tests.sh
# net.ipv4.ip_forward = 1
#
# TEST: rule6 check: oif redirect to table [ OK ]
#
# TEST: rule6 del by pref: oif redirect to table [ OK ]
#
# TEST: rule6 check: iif redirect to table [ OK ]
#
# TEST: rule6 del by pref: iif redirect to table [ OK ]
#
# TEST: rule6 check: dsfield 1 [ OK ]
#
# TEST: rule6 check: dsfield 2 [ OK ]
#
# TEST: rule6 check: dsfield 3 [ OK ]
#
# TEST: rule6 check: tos 0x10 redirect to table [ OK ]
#
# TEST: rule6 del by pref: tos 0x10 redirect to table [ OK ]
#
# TEST: rule6 check: tos 0x11 redirect to table [ OK ]
#
# TEST: rule6 del by pref: tos 0x11 redirect to table [ OK ]
#
# TEST: rule6 check: tos 0x12 redirect to table [ OK ]
#
# TEST: rule6 del by pref: tos 0x12 redirect to table [ OK ]
#
# TEST: rule6 check: tos 0x13 redirect to table [ OK ]
#
# TEST: rule6 del by pref: tos 0x13 redirect to table [ OK ]
#
# TEST: rule6 check: fwmark redirect to table [ OK ]
#
# TEST: rule6 del by pref: fwmark redirect to table [ OK ]
#
# TEST: rule6 check: uid redirect to table [ OK ]
#
# TEST: rule6 del by pref: uid redirect to table [ OK ]
#
# TEST: rule6 check: sport and dport redirect to table [ OK ]
#
# TEST: rule6 del by pref: sport and dport redirect to table [ OK ]
#
# TEST: rule6 check: ipproto match [ OK ]
#
# TEST: rule6 del by pref: ipproto match [ OK ]
#
# TEST: rule6 check: ipproto ipv6-icmp match [ OK ]
#
# TEST: rule6 del by pref: ipproto ipv6-icmp match [ OK ]
#
# TEST: rule4 check: oif redirect to table [ OK ]
#
# TEST: rule4 del by pref: oif redirect to table [ OK ]
#
# TEST: rule4 check: iif redirect to table [ OK ]
#
# TEST: rule4 del by pref: iif redirect to table [ OK ]
#
# TEST: rule4 check: dsfield 1 [ OK ]
#
# TEST: rule4 check: dsfield 2 [ OK ]
#
# TEST: rule4 check: dsfield 3 [ OK ]
#
# TEST: rule4 check: tos 0x10 redirect to table [ OK ]
#
# TEST: rule4 del by pref: tos 0x10 redirect to table [ OK ]
#
# TEST: rule4 check: tos 0x11 redirect to table [ OK ]
#
# TEST: rule4 del by pref: tos 0x11 redirect to table [ OK ]
#
# TEST: rule4 check: tos 0x12 redirect to table [ OK ]
#
# TEST: rule4 del by pref: tos 0x12 redirect to table [ OK ]
#
# TEST: rule4 check: tos 0x13 redirect to table [ OK ]
#
# TEST: rule4 del by pref: tos 0x13 redirect to table [ OK ]
#
# TEST: rule4 check: fwmark redirect to table [ OK ]
#
# TEST: rule4 del by pref: fwmark redirect to table [ OK ]
#
# TEST: rule4 check: uid redirect to table [ OK ]
#
# TEST: rule4 del by pref: uid redirect to table [ OK ]
#
# TEST: rule4 check: sport and dport redirect to table [ OK ]
#
# TEST: rule4 del by pref: sport and dport redirect to table [ OK ]
#
# TEST: rule4 check: ipproto tcp match [ OK ]
#
# TEST: rule4 del by pref: ipproto tcp match [ OK ]
#
# TEST: rule4 check: ipproto icmp match [ OK ]
#
# TEST: rule4 del by pref: ipproto icmp match [ OK ]
#
# TEST: rule6 dsfield udp connect (dsfield 0x04) [ OK ]
#
# TEST: rule6 dsfield tcp connect (dsfield 0x04) [ OK ]
#
# TEST: rule6 dsfield udp connect (dsfield 0x05) [ OK ]
#
# TEST: rule6 dsfield tcp connect (dsfield 0x05) [ OK ]
#
# TEST: rule6 dsfield udp connect (dsfield 0x06) [ OK ]
#
# TEST: rule6 dsfield tcp connect (dsfield 0x06) [ OK ]
#
# TEST: rule6 dsfield udp connect (dsfield 0x07) [ OK ]
#
# TEST: rule6 dsfield tcp connect (dsfield 0x07) [ OK ]
#
# TEST: rule4 dsfield udp connect (dsfield 0x04) [FAIL]
#
# TEST: rule4 dsfield tcp connect (dsfield 0x04) [ OK ]
#
# TEST: rule4 dsfield udp connect (dsfield 0x05) [FAIL]
#
# TEST: rule4 dsfield tcp connect (dsfield 0x05) [ OK ]
#
# TEST: rule4 dsfield udp connect (dsfield 0x06) [FAIL]
#
# TEST: rule4 dsfield tcp connect (dsfield 0x06) [ OK ]
#
# TEST: rule4 dsfield udp connect (dsfield 0x07) [FAIL]
#
# TEST: rule4 dsfield tcp connect (dsfield 0x07) [ OK ]
#
# Tests passed: 62
# Tests failed: 4
not ok 1 selftests: net: fib_rule_tests.sh # exit=1

It is not considered a regression as this is the first time we have run these tests for lunar:linux-aws on a non-development release, while the past development releases also have this bug. See, for example, lunar:linux-aws 6.2.0-1002.2 in d2023.03.07 (http://10.246.75.167/d2023.03.07/lunar/linux-aws/6.2.0-1002.2/sru-aws-aws-a1.medium-ubuntu_kernel_selftests-log.html#net:fib_rule_tests.sh-start).

As an additional note, this doesn't affect all instance types. For example, it passed on c3.xlarge while it failed on a1.medium.

[Po-Hsu Lin (cypressyew)]

This issue can be found on Lunar Azure 6.2
On Standard_A2_v2 (-1005, with just one failure) and Standard_B1ms (-1005, -1006, -1007, with 4 failures)