Hi Kuniyuki,
The bpf CI has recently hit failure in the "migrate_reuseport/IPv4
TCP_NEW_SYN_RECV" test. It does not always fail but becomes more flaky recently:
https://github.com/kernel-patches/bpf/actions/runs/8354884067/job/22869153115
It could be due to some slowness in the bpf CI environment but failing because
of environment slowness is still not expected.
I took a very quick look. It seems like the test depends on the firing of the
timer's handler "reqsk_timer_handler()", so there is a sleep(1) in the test.
May be the timer fired slower and the test failed? If that is the case, it may
help to directly trace the reqsk_timer_handler() and wait for enough time to
ensure it is called.
This test has been temporarily disabled for now
(https://github.com/kernel-patches/vmtest/blob/master/ci/vmtest/configs/DENYLIST).
Once you have a fix, we can re-enable it again to ensure this migrate feature
will not regress.
Thanks,
Martin
