Hey Stanislav, I've noticed that on 5.5 kernel libbpf Travis CI test runs occasionally fail due to selftests hanging indefinitely. It seems like it always happens after sockopt tests succeed, and while sockopt_inherit test is running. Doesn't seem like the latest kernel is affected (I haven't found hangs for the latest kernel in recent history). This is the latest version of selftests, but running on an older (5.5) version of kernel. So whatever fixes went into selftests are there already. So I wonder if there were any kernel bugs that were fixed already but could cause hangs on 5.5? I can disable that specific test for 5.5, but though I should bring this up first, just in case there are still some bugs in selftests. Thanks for checking! Two most recent failures (not that they are helpful, because there is no output until tests completes, but still): - https://travis-ci.com/github/libbpf/libbpf/jobs/359067538 - https://travis-ci.com/github/libbpf/libbpf/jobs/359784775
