On Thu, Jan 14, 2021 at 3:50 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > > On Thu, Jan 14, 2021 at 3:29 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > > > > On Thu, Jan 14, 2021 at 3:24 PM Jiri Olsa <jolsa@xxxxxxxxxx> wrote: > > > > > > On Thu, Jan 14, 2021 at 03:13:18PM +0100, Sedat Dilek wrote: > > > > On Mon, Jan 11, 2021 at 11:31 PM Jiri Olsa <jolsa@xxxxxxxxxx> 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 > > > > > > > > > > > > > I switched to LLVM v12 from <apt.llvm.org> and saw the same FAILED line. > > > > > > > > The generated vmlinux file is cleaned on failure. > > > > > > > > + 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 > > > > > > did pahole generated the .BTF section? earlier in the log > > > > > > jirka > > > > > > > Cannot say. > > > > I did: > > > > $ git diff > > diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh > > index 2d0b28758aa5..c6e679d08bbe 100755 > > --- a/scripts/link-vmlinux.sh > > +++ b/scripts/link-vmlinux.sh > > @@ -401,12 +401,6 @@ fi > > > > vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} > > > > -# fill in BTF IDs > > -if [ -n "${CONFIG_DEBUG_INFO_BTF}" -a -n "${CONFIG_BPF}" ]; then > > - info BTFIDS vmlinux > > - ${RESOLVE_BTFIDS} vmlinux > > -fi > > - > > if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then > > info SORTTAB vmlinux > > if ! sorttable vmlinux; then > > > > Before... > > Encountered error while encoding BTF. > + llvm-objcopy --only-section=.BTF --set-section-flags > .BTF=alloc,readonly --strip-all .tmp_vmlinux.btf .btf.vmlinux.bin.o > > ...I see lots of errors. > > I have cut the relevant stuff and placed it in the attachment. > > With freshly installed bpftool: > > $ /usr/sbin/bpftool btf dump file ./vmlinux > Error: failed to load BTF from ./vmlinux: Invalid argument > This is with CONFIG_DEBUG_INFO_DWARF4=y. ( See attached patch with cover-letter - applied here on top of Linux v5.11-rc3+). Concerning this I am looking into [1]: die__process_unit: DW_TAG_label (0xa) @ <0xa7> not handled! die__process_unit: tag not supported 0xa (label)! - Sedat - [1] http://www.dwarfstd.org/doc/DWARF4.pdf > 3.5 LABEL ENTRIES
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