On Mon, Oct 07, 2024 at 10:24:01AM -0700, Stephen Brennan wrote: > Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> writes: > > On Fri, Oct 4, 2024 at 2:21 PM Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote: > >> > >> On Fri, Oct 04, 2024 at 10:26:24AM -0700, Stephen Brennan wrote: > >> > Hi all, > >> > > >> > This is v4 of the series which adds global variables to pahole's generated BTF. > >> > > >> > Since v3: > >> > > >> > 1. Gathered Alan's Reviewed-by + Tested-by, and Jiri's Acked-by. > >> > 2. Consistently start shndx loops at 1, and use size_t. > >> > 3. Since patch 1 of v3 was already applied, I dropped it out of this series. > >> > > >> > v3: https://lore.kernel.org/dwarves/20241002235253.487251-1-stephen.s.brennan@xxxxxxxxxx/ > >> > v2: https://lore.kernel.org/dwarves/20240920081903.13473-1-stephen.s.brennan@xxxxxxxxxx/ > >> > v1: https://lore.kernel.org/dwarves/20240912190827.230176-1-stephen.s.brennan@xxxxxxxxxx/ > >> > > >> > Thanks everyone for your review, tests, and consideration! > >> > >> Looks ok, I run the existing regression tests: > >> > >> acme@x1:~/git/pahole$ tests/tests > >> 1: Validation of BTF encoding of functions; this may take some time: Ok > >> 2: Pretty printing of files using DWARF type information: Ok > >> 3: Parallel reproducible DWARF Loading/Serial BTF encoding: Ok > >> /home/acme/git/pahole > >> acme@x1:~/git/pahole$ > >> > >> And now I'm building a kernel with clang + Thin LTO + Rust enabled in > >> the kernel to test other fixes I have merged and doing that with your > >> patch series. > >> > >> Its all in the next branch and will move to master later today or > >> tomorrow when I finish the clang+LTO+Rust tests. > > > > pahole-staging testing in libbpf CI started failing recently, can you > > please double-check and see if this was caused by these changes? They > > seem to be related to encoding BTF for per-CPU global variables, so > > might be relevant ([0] for full run logs) > > > > #33 btf_dump:FAIL > > libbpf: extern (var ksym) 'bpf_prog_active': not found in kernel BTF > > libbpf: failed to load object 'kfunc_call_test_subprog' > > libbpf: failed to load BPF skeleton 'kfunc_call_test_subprog': -22 > > test_subprog:FAIL:skel unexpected error: -22 > > #126/17 kfunc_call/subprog:FAIL > > test_subprog_lskel:FAIL:skel unexpected error: -2 > > #126/18 kfunc_call/subprog_lskel:FAIL > > #126 kfunc_call:FAIL > > test_ksyms_module_lskel:FAIL:test_ksyms_module_lskel__open_and_load > > unexpected error: -2 > > #135/1 ksyms_module/lskel:FAIL > > libbpf: extern (var ksym) 'bpf_testmod_ksym_percpu': not found in kernel BTF > > libbpf: failed to load object 'test_ksyms_module' > > libbpf: failed to load BPF skeleton 'test_ksyms_module': -22 > > test_ksyms_module_libbpf:FAIL:test_ksyms_module__open unexpected error: -22 > > #135/2 ksyms_module/libbpf:FAIL > > > > > > [0] https://github.com/libbpf/libbpf/actions/runs/11204199648/job/31142297399#step:4:12480 > > Hi Andrii, > > Thanks for the report. > > The error: "'bpf_prog_active' not found in kernel BTF" sounds like it's > related to a bug that was present in v4 of this patch series: > > https://lore.kernel.org/dwarves/ZwPob57HKYbfNpOH@x1/T/#t > > Basically due to poor testing of a small refactor on my part, pahole > failed to emit almost all of the variables for BTF, so it would very > likely cause this error. And I think this broken commit may have been > hanging around in the git repository for the weekend, maybe Arnaldo can > confirm whether or not it was fixed up. > > I cannot see the git SHA for the pahole branch which was used in this CI > run, so I can't say for sure. But I do see that the "tmp.master" branch > is now fixed up, so a re-run would verify whether this is the root > cause. right, that is a piece of info I sometimes miss, the SHA used for the test run, but today's test is in progress and should have the fix for the inverted logic, we'll see... - Arnaldo
