On 07/10, Andrii Nakryiko wrote:
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
Nothing pops up, I don't think we did any fixes to address any
occasional failles like that.
The only fixes we did are:
d8fe449a9c51 - bpf: Don't return EINVAL from {get,set}sockopt when optlen >
PAGE_SIZE
9babe825da76 - bpf: always allocate at least 16 bytes for setsockopt hook
And I don't see how this test can hang without any of those (should
either always pass or fail).
Let's maybe try to disable it, as you suggested, and see if that's
indeed this sockopt_inherit test that's misbehaving?
I can try to find some time next week to reproduce.
