Hello here's some of the basic information, I don't have a minimum code sample to reproduce the error and I don't really feel inclined to spend the time to make one since I have already found a solution. I'm not able to release the production code we are using. 5.3.0-53-generic #47~18.04.1-Ubuntu SMP Thu May 7 13:10:50 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux Ubuntu clang version 10.0.1-++20200529024103+a634a80615b-1~exp1~20200529124721.169 Target: x86_64-pc-linux-gnu You can find the discussion here: https://www.spinics.net/lists/xdp-newbies/msg01730.html On Thu, Jun 11, 2020 at 1:46 PM Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> wrote: > > On Thu, Jun 11, 2020 at 1:41 PM Elerion <elerion1000@xxxxxxxxx> wrote: > > > > I am using libbpf from here https://github.com/libbpf/libbpf I'm not > > using ebpf. I just linked to the ebpf issue because it seems like the > > only thing related to this problem when I googled it. > > Ok, that I can help with, then. > > What's the kernel version? Where I can find repro? Steps, etc. > Basically, a bit more context would help, as I wasn't part of initial > discussion. > > > > > > On Thu, Jun 11, 2020 at 9:34 AM Andrii Nakryiko > > <andrii.nakryiko@xxxxxxxxx> wrote: > > > > > > On Thu, Jun 11, 2020 at 4:00 AM Jesper Dangaard Brouer > > > <brouer@xxxxxxxxxx> wrote: > > > > > > > > (Cross-posting to iovisor-dev) > > > > > > > > Seeking input from BPF-llvm developers. How come Clang/LLVM 10+ is > > > > generating incompatible BTF-info in ELF file, and downgrading to LLVM-9 > > > > fixes the issue ? > > > > > > > > > > > > On Wed, 10 Jun 2020 14:50:27 -0700 Elerion <elerion1000@xxxxxxxxx> wrote: > > > > > > > > > Never mind, I fixed it by downgrading to Clang 9. > > > > > > > > > > It appears to be an issue with Clang/LLVM 10+ > > > > > > > > > > https://github.com/cilium/ebpf/issues/43 > > > > > > This is newer Clang recording that function is global, not static. > > > libbpf is sanitizing BTF to remove this flag, if kernel doesn't > > > support this. But given this is re-implementation of libbpf, that's > > > probably not happening, right? > > > > > > > > > > > > > On Wed, Jun 10, 2020 at 2:38 PM Toke Høiland-Jørgensen <toke@xxxxxxxxxx> wrote: > > > > > > > > > > > > Elerion <elerion1000@xxxxxxxxx> writes: > > > > > > > > > > > > > [69] FUNC xdp_program type_id=68 vlen != 0 > > > > > > > > > > > > 'vlen != 0' is the error. Not sure why you hit that; what's the output > > > > > > of 'bpftool btf dump file yourprog.o' ? > > > > > > > > > > > > -Toke > > > > > > > > > > > > > > > > > > -- > > > > Best regards, > > > > Jesper Dangaard Brouer > > > > MSc.CS, Principal Kernel Engineer at Red Hat > > > > LinkedIn: http://www.linkedin.com/in/brouer > > > >
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