On Sun, Feb 4, 2024 at 10:58 PM Yonghong Song <yonghong.song@xxxxxxxxx> wrote: > > The selftest verif_scale_strobemeta_subprogs failed with latest llvm19 compiler. > For example, > > $ ./test_progs -n 498 > ... > libbpf: prog 'on_event': BPF program load failed: Permission denied > libbpf: prog 'on_event': -- BEGIN PROG LOAD LOG -- > combined stack size of 4 calls is 544. Too large > verification time 1417195 usec > stack depth 24+440+0+32 Is it a `struct strobe_map_raw map` in read_map_var()? I think we should move it to a per-cpu array anyways (not saying we shouldn't fix Clang regression), in production we've done this already a while ago :) > processed 53561 insns (limit 1000000) max_states_per_insn 18 total_states 1457 peak_states 308 mark_read 146 > -- END PROG LOAD LOG -- > libbpf: prog 'on_event': failed to load: -13 > libbpf: failed to load object 'strobemeta_subprogs.bpf.o' > scale_test:FAIL:expect_success unexpected error: -13 (errno 13) > #498 verif_scale_strobemeta_subprogs:FAIL > Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED > > The maximum stack size exceeded 512 bytes and caused verification failure. > > The following llvm patch caused the above regression: > https://github.com/llvm/llvm-project/pull/68882 > > I will do some analysis and try to find a solution to resolve this failure. > > Thanks, > > Yonghong > >
