Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

SCTP not working on LTS kernels when build on alpine 3.13 #332

Open
RoadRunnr opened this issue Mar 25, 2021 · 5 comments · May be fixed by #477
Open

SCTP not working on LTS kernels when build on alpine 3.13 #332

RoadRunnr opened this issue Mar 25, 2021 · 5 comments · May be fixed by #477

Comments

@RoadRunnr
Copy link

Somewhere after Linux 5.4 (which is still in use on many LTS releases of distros and on many clouds) the SCTP user space API changed. Alpine 3.13 uses a sctp.h from a kernel with the newer API, preventing Erlang SCTP from working on those kernels.

Builds that use the older SCTP continue to work on newer kernels.
@mgumz
Copy link

mgumz commented Apr 1, 2021

is torvalds/linux@af6bb61 the root-cause?

@RoadRunnr
Copy link
Author

is torvalds/linux@af6bb61 the root-cause?

No

@mgumz
Copy link

mgumz commented Apr 1, 2021

do you know which change did break the userland-api? iirc, breaking userland-api is rather a nongoal of LT

@RoadRunnr
Copy link
Author

do you know which change did break the userland-api? iirc, breaking userland-api is rather a nongoal of LT

b6e6b5f1da7e8

but it is somewhat debatable if that broke UAPI. Applications compiled for older kernel will work happily after that change, so backward compatibility is maintained. Only applications compiled for newer kernel will not work on older kernels. Not sure if that kind of forward compatibility is a goal for UAPI. You would need to ask the kernel net-dev mailing list for that.

@fholzhauser
Copy link

The fix would be then to build erlang OTP against 5.4 linux headers (from the 3.12 repository) on alpine 3.13. I've tried it locally and it works. We could prepare a PR either to change the build of the alpine variants accordingly or create a new variant (e.g. alpine-lts ?) as long as it is needed and kernel versions catch up in the most commonly used LTS distributions. It would be great if the maintainers could help with their preference.
Thanks @RoadRunnr for the hint

@fholzhauser fholzhauser mentioned this issue Apr 12, 2021
Open
@RoadRunnr RoadRunnr mentioned this issue Oct 8, 2021
Closed
@RoadRunnr RoadRunnr linked a pull request Jul 3, 2024 that will close this issue
Open
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
None yet
Projects
None yet
Milestone
No milestone
Development

Successfully merging a pull request may close this issue.

make SCTP in images work older Linux kernels RoadRunnr/docker-erlang-otp
3 participants
@RoadRunnr @fholzhauser @mgumz