On Tue, Jan 12, 2021 at 2:10 PM Jiri Olsa <jolsa@xxxxxxxxxx> wrote: > > On Tue, Jan 12, 2021 at 11:46:22AM +0100, Jiri Olsa wrote: > > On Mon, Jan 11, 2021 at 02:34:04PM -0800, Tom Stellard wrote: > > > On 1/11/21 2:31 PM, Jiri Olsa wrote: > > > > On Mon, Jan 11, 2021 at 10:30:22PM +0100, Sedat Dilek wrote: > > > > > > > > SNIP > > > > > > > > > > > > > > > > > > Building a new Linux-kernel... > > > > > > > > > > > > > > - Sedat - > > > > > > > > > > > > > > [1] https://git.kernel.org/pub/scm/devel/pahole/pahole.git/ > > > > > > > [2] https://github.com/ClangBuiltLinux/tc-build/issues/129#issuecomment-758026878 > > > > > > > [3] https://github.com/ClangBuiltLinux/tc-build/issues/129#issuecomment-758056553 > > > > > > > > > > > > There are no significant bug fixes between pahole 1.19 and master that > > > > > > would solve this problem, so let's try to repro this. > > > > > > > > > > > > > > > > You are right pahole fom latest Git does not solve the issue. > > > > > > > > > > + info BTFIDS vmlinux > > > > > + [ != silent_ ] > > > > > + printf %-7s %s\n BTFIDS vmlinux > > > > > BTFIDS vmlinux > > > > > + ./tools/bpf/resolve_btfids/resolve_btfids vmlinux > > > > > FAILED: load BTF from vmlinux: Invalid argument > > > > > > > > hm, is there a .BTF section in vmlinux? > > > > > > > > is this working over vmlinux: > > > > $ bpftool btf dump file ./vmlinux > > > > > > > > do you have a verbose build output? I'd think pahole scream first.. > > > > > > > > > > It does. For me, pahole segfaults at scripts/link-vmlinux.sh:131. This is > > > pretty easy for me to reproduce. I have logs, what other information would > > > be helpful? How about a pahole backtrace? > > > > that'd be great.. I'll try to reproduce, but with the latest clang > > it will take me some time > > reproduced, attached pahole patch fixes it for me, > > looks like gcc never left function without name, > which does not seem to be the case for clang > > I'll send full patch later today > Thanks for the diff. Unfortunately, it does not apply on latest pahole git. $ git describe v1.19-7-gb688e3597060 - Sedat - > jirka > > > --- > diff --git a/btf_encoder.c b/btf_encoder.c > index c40f059580da..781fb35a2646 100644 > --- a/btf_encoder.c > +++ b/btf_encoder.c > @@ -70,6 +70,8 @@ static int collect_function(struct btf_elf *btfe, GElf_Sym *sym) > return 0; > if (!elf_sym__value(sym)) > return 0; > + if (!elf_sym__name(sym, btfe->symtab)) > + return 0; > > if (functions_cnt == functions_alloc) { > functions_alloc = max(1000, functions_alloc * 3 / 2); > @@ -620,9 +622,11 @@ int cu__encode_btf(struct cu *cu, int verbose, bool force, > if (!has_arg_names(cu, &fn->proto)) > continue; > if (functions_cnt) { > - struct elf_function *func; > + const char *name = function__name(fn, cu); > + struct elf_function *func = NULL; > > - func = find_function(btfe, function__name(fn, cu)); > + if (name) > + func = find_function(btfe, name); > if (!func || func->generated) > continue; > func->generated = true; >
