several tests failed with 6.13 kernel

[funglee2k22]

To whom it may concern,

I hit some strange test failures when running packetdrill against 6.13 kernel build from net-next repo. For example, it seems some TCP Cubic related tests failed. Basically, hystart exits earlier than expected.

Is there anybody else see similar error ? I repeat the same test against 6.8 kernel, everything looks fine (a.k.a al l tests are passed).

Thanks.

Yours
Feng Li
here is the traces run as a local test

root@ip-172-31-42-18:/extra_spaces_3/repo/packetdrill/gtests/net# ./packetdrill/run_all.py -S -v -L -l tcp/cubic/cubic-bulk-166k-idle-restart.pkt
FAIL [/extra_spaces_3/repo/packetdrill/gtests/net/tcp/cubic/cubic-bulk-166k-idle-restart.pkt (ipv4)]
stdout:
20
30
36
stderr:
cubic-bulk-166k-idle-restart.pkt:51: error in Python code
Traceback (most recent call last):
File "/tmp/code_XcteFU", line 365, in
print(tcpi_snd_cwnd); assert tcpi_snd_cwnd == 40, tcpi_snd_cwnd
AssertionError: 36
cubic-bulk-166k-idle-restart.pkt: error executing code: 'python3' returned non-zero status 1
FAIL [/extra_spaces_3/repo/packetdrill/gtests/net/tcp/cubic/cubic-bulk-166k-idle-restart.pkt (ipv4-mapped-v6)]
stdout:
20
30
36
stderr:
cubic-bulk-166k-idle-restart.pkt:51: error in Python code
Traceback (most recent call last):
File "/tmp/code_y8aczG", line 365, in
print(tcpi_snd_cwnd); assert tcpi_snd_cwnd == 40, tcpi_snd_cwnd
AssertionError: 36
cubic-bulk-166k-idle-restart.pkt: error executing code: 'python3' returned non-zero status 1
FAIL [/extra_spaces_3/repo/packetdrill/gtests/net/tcp/cubic/cubic-bulk-166k-idle-restart.pkt (ipv6)]
stdout:
20
30
36
stderr:
cubic-bulk-166k-idle-restart.pkt:51: error in Python code
Traceback (most recent call last):
File "/tmp/code_HgdH8g", line 365, in
print(tcpi_snd_cwnd); assert tcpi_snd_cwnd == 40, tcpi_snd_cwnd
AssertionError: 36
cubic-bulk-166k-idle-restart.pkt: error executing code: 'python3' returned non-zero status 1
Ran 3 tests: 0 passing, 3 failing, 0 timed out (31.38 sec): tcp/cubic/cubic-bulk-166k-idle-restart.pkt