Client "failed to dial: invalid argument" on s390x big-endian architecture

[rposts]

Hi there,

I am trying to build Calico on s390x architecture which uses this package for SCTP related logic. I noticed that client would not connect to server spitting out following message:

/tmp/gotest/sctp/example# ./example -port 1000 -ip localhost
2021/05/04 08:04:41 Resolved address 'localhost' to 127.0.0.1
2021/05/04 08:04:41 raw addr: [0 2 3 232 127 0 0 1 0 0 0 0 0 0 0 0]
2021/05/04 08:04:41 failed to dial: invalid argument

Upon debugging I found that SCTP_SOCKOPT_CONNECTX3 flag used here caused the issue. When I replaced the flag with SCTP_SOCKOPT_CONNECTX then it works fine.

I am using go version go1.15.2 linux/s390x to compile/run the example included in the repository.

Just wondering what would cause this issue and whether SCTP_SOCKOPT_CONNECTX can be used exclusively during SCTPConnect function?

Thanks!

[rposts]

Some more update: I noticed that by only changing optlen to uintptr(unsafe.Pointer(&optlen)) makes it work across most of s390x distros. It certainly looks like getsockopt function is having trouble passing the optlen arguments. Wonder if there are other ways of achieving similar results?

[rposts]

Closing - N/A.