On Mon, Jul 11, 2022 at 09:19:45AM +0200, Jiri Olsa wrote: > On Sun, Jul 10, 2022 at 10:57:01PM -0700, Donald Chan wrote: > > Hi, > > > > I am trying to enable CONFIG_DEBUG_INFO_BTF when building a > > Yocto-based Linux kernel....but it is failing with this error: > > > > | LD .tmp_vmlinux.btf > > | BTF .btf.vmlinux.bin.o > > | LD .tmp_vmlinux.kallsyms1 > > | KSYMS .tmp_vmlinux.kallsyms1.S > > | AS .tmp_vmlinux.kallsyms1.S > > | LD .tmp_vmlinux.kallsyms2 > > | KSYMS .tmp_vmlinux.kallsyms2.S > > | AS .tmp_vmlinux.kallsyms2.S > > | LD vmlinux > > | BTFIDS vmlinux > > | FAILED: load BTF from vmlinux: No such file or directory > > > > I dug deeper and it seems that the resolve_btfids utility is not able > > to find any relevant .BTF section (at btf__parse from function > > symbols_resolve). > > > > Dumped the vmlinux and also confirmed there is only .BTF_ids section: > > > > [2993] .rela___ksymtab_g RELA 0000000000000000 17174de0 > > 0000000000000048 0000000000000018 I 22807 2992 8 > > [2994] .BTF_ids PROGBITS 0000000000000000 0105c504 > > 00000000000000fc 0000000000000000 A 0 0 1 > > > > What could be wrong? Sample config is available at > > https://gist.github.com/hoiho-amzn/964eb0cf2b4459f6775d7af1da7b4056 I compiled x86_64 bpf-next/master kernel with your config with no problems, could you share more details? like: - version of dwarves/pahole - clang/gcc? versions - V=1 compile log - command line options - tree/branch you're on - anything else ;-) thanks, jirka > > > > The issue exists on x86_64, I also have tried armv7 with the same > > result so doesn't seem to be arch-specific. > > hi, > do you use any special command line options? > what tree/branch are you on? > > thanks, > jirka > > > > > Thanks > > Donald
