On Mon, 19 Oct 2020 16:12:12 -0400, Don Zickus wrote: > Sorry about that. I thought things were failing because of ARK infra but > now they are failing due to libbpf on s390x. Does bpf compile there? > [...] > 00:01:25 LINK resolve_btfids > 00:04:11 libbpf: non-native ELF endianness is not supported Thanks for the log. The problem seems to be the cross-compiling. While eBPF was supposed to be architecture independent byte code, the authors failed in reaching the goal - eBPF is not endianess neutral. eBPF byte code compiled on a little endian machine cannot be used on a big endian machine and vice versa. Now, libbpf does non-trivial rewriting of eBPF code (you can think of it as a compiler of sort). And apparently, libbpf compiled and running on a little endian machine cannot handle big endian eBPF byte code. I'm not sure what exactly is causing this failure. My guess would be CONFIG_DEBUG_INFO_BTF. If I'm right, we'll probably have to disable it on s390x while cross compiling for the time being. Could you try a cross-compile with CONFIG_DEBUG_INFO_BTF disabled? It's something that will have to be done only for cross-compiling, we want that config option enabled on native builds. On a related note, if this is the cause of the CKI failures, I wonder why the log snippet you quoted was not the very first thing in the emails? We talked about the CKI email format before and I think there's still a lot of room for improvements there. It should be immediately obvious what went wrong from the email, while currently, it requires a CKI expert to actually interpret it. Thanks, Jiri _______________________________________________ kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx
