On Wed, Feb 3, 2021 at 7:13 PM Nick Desaulniers <ndesaulniers@xxxxxxxxxx> wrote: > > On Wed, Feb 3, 2021 at 6:58 PM Andrii Nakryiko > <andrii.nakryiko@xxxxxxxxx> wrote: > > > > On Wed, Feb 3, 2021 at 5:31 PM Nick Desaulniers <ndesaulniers@xxxxxxxxxx> wrote: > > > > > > On Sun, Jan 17, 2021 at 12:14 PM Arnaldo Carvalho de Melo > > > <acme@xxxxxxxxxx> wrote: > > > > > > > > Em Fri, Jan 15, 2021 at 03:43:06PM -0800, Yonghong Song escreveu: > > > > > > > > > > > > > > > On 1/15/21 3:34 PM, Nick Desaulniers wrote: > > > > > > On Fri, Jan 15, 2021 at 3:24 PM Yonghong Song <yhs@xxxxxx> wrote: > > > > > > > > > > > > > > > > > > > > > > > > > > > > On 1/15/21 1:53 PM, Sedat Dilek wrote: > > > > > > > > En plus, I encountered breakage with GCC v10.2.1 and LLVM=1 and > > > > > > > > CONFIG_DEBUG_INFO_DWARF4. > > > > > > > > So might be good to add a "depends on !DEBUG_INFO_BTF" in this combination. > > > > > > > > > > > > Can you privately send me your configs that repro? Maybe I can isolate > > > > > > it to a set of configs? > > > > > > > > > > > > > > > > > > > > I suggested not to add !DEBUG_INFO_BTF to CONFIG_DEBUG_INFO_DWARF4. > > > > > > > It is not there before and adding this may suddenly break some users. > > > > > > > > > > > > > > If certain combination of gcc/llvm does not work for > > > > > > > CONFIG_DEBUG_INFO_DWARF4 with pahole, this is a bug bpf community > > > > > > > should fix. > > > > > > > > > > > > Is there a place I should report bugs? > > > > > > > > > > You can send bug report to Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, > > > > > dwarves@xxxxxxxxxxxxxxx and bpf@xxxxxxxxxxxxxxx. > > > > > > > > I'm coming back from vacation, will try to read the messages and see if > > > > I can fix this. > > > > > > IDK about DWARF v4; that seems to work for me. I was previously observing > > > https://bugzilla.redhat.com/show_bug.cgi?id=1922698 > > > with DWARF v5. I just re-pulled the latest pahole, rebuilt, and no > > > longer see that warning. > > > > > > I now observe a different set. I plan on attending "BPF office hours > > > tomorrow morning," but if anyone wants a sneak peak of the errors and > > > how to reproduce: > > > https://gist.github.com/nickdesaulniers/ae8c9efbe4da69b1cf0dce138c1d2781 > > > > > > > Is there another (easy) way to get your patch set without the b4 tool? > > Is your patch set present in some patchworks instance, so that I can > > download it in mbox format, for example? > > $ wget https://lore.kernel.org/lkml/20210130004401.2528717-2-ndesaulniers@xxxxxxxxxx/raw > -O - | git am > $ wget https://lore.kernel.org/lkml/20210130004401.2528717-3-ndesaulniers@xxxxxxxxxx/raw > -O - | git am > > If you haven't tried b4 yet, it's quite nice. Hard to go back. Lore > also has mbox.gz links. Not sure about patchwork. > Ok, I managed to apply that on linux-next, but I can't get past this: ld.lld: error: undefined symbol: pa_trampoline_start >>> referenced by arch/x86/realmode/rm/header.o:(real_mode_header) ld.lld: error: undefined symbol: pa_trampoline_header >>> referenced by arch/x86/realmode/rm/header.o:(real_mode_header) ld.lld: error: undefined symbol: pa_trampoline_pgd >>> referenced by arch/x86/realmode/rm/header.o:(real_mode_header) >>> referenced by trampoline_64.S:142 (/data/users/andriin/linux/arch/x86/realmode/rm/trampoline_64.S:142) >>> arch/x86/realmode/rm/trampoline_64.o:(startup_32) ld.lld: error: undefined symbol: pa_wakeup_start >>> referenced by arch/x86/realmode/rm/header.o:(real_mode_header) ld.lld: error: undefined symbol: pa_wakeup_header >>> referenced by arch/x86/realmode/rm/header.o:(real_mode_header) ld.lld: error: undefined symbol: pa_machine_real_restart_asm >>> referenced by arch/x86/realmode/rm/header.o:(real_mode_header) ld.lld: error: undefined symbol: pa_startup_32 >>> referenced by trampoline_64.S:77 (/data/users/andriin/linux/arch/x86/realmode/rm/trampoline_64.S:77) >>> arch/x86/realmode/rm/trampoline_64.o:(trampoline_start) ld.lld: error: undefined symbol: pa_tr_flags >>> referenced by trampoline_64.S:124 (/data/users/andriin/linux/arch/x86/realmode/rm/trampoline_64.S:124) >>> arch/x86/realmode/rm/trampoline_64.o:(startup_32) ld.lld: error: undefined symbol: pa_tr_cr4 >>> referenced by trampoline_64.S:138 (/data/users/andriin/linux/arch/x86/realmode/rm/trampoline_64.S:138) >>> arch/x86/realmode/rm/trampoline_64.o:(startup_32) ld.lld: error: undefined symbol: pa_tr_efer >>> referenced by trampoline_64.S:146 (/data/users/andriin/linux/arch/x86/realmode/rm/trampoline_64.S:146) >>> arch/x86/realmode/rm/trampoline_64.o:(startup_32) >>> referenced by trampoline_64.S:147 (/data/users/andriin/linux/arch/x86/realmode/rm/trampoline_64.S:147) >>> arch/x86/realmode/rm/trampoline_64.o:(startup_32) ld.lld: error: undefined symbol: pa_startup_64 >>> referenced by trampoline_64.S:161 (/data/users/andriin/linux/arch/x86/realmode/rm/trampoline_64.S:161) >>> arch/x86/realmode/rm/trampoline_64.o:(startup_32) ld.lld: error: undefined symbol: pa_tr_gdt >>> referenced by arch/x86/realmode/rm/trampoline_64.o:(tr_gdt) >>> referenced by reboot.S:28 (/data/users/andriin/linux/arch/x86/realmode/rm/reboot.S:28) >>> arch/x86/realmode/rm/reboot.o:(machine_real_restart_asm) ld.lld: error: undefined symbol: pa_machine_real_restart_paging_off >>> referenced by reboot.S:34 (/data/users/andriin/linux/arch/x86/realmode/rm/reboot.S:34) >>> arch/x86/realmode/rm/reboot.o:(machine_real_restart_asm) ld.lld: error: undefined symbol: pa_machine_real_restart_idt >>> referenced by reboot.S:47 (/data/users/andriin/linux/arch/x86/realmode/rm/reboot.S:47) >>> arch/x86/realmode/rm/reboot.o:(machine_real_restart_asm) ld.lld: error: undefined symbol: pa_machine_real_restart_gdt >>> referenced by reboot.S:54 (/data/users/andriin/linux/arch/x86/realmode/rm/reboot.S:54) >>> arch/x86/realmode/rm/reboot.o:(machine_real_restart_asm) >>> referenced by arch/x86/realmode/rm/reboot.o:(machine_real_restart_gdt) ld.lld: error: undefined symbol: pa_wakeup_gdt >>> referenced by arch/x86/realmode/rm/wakeup_asm.o:(wakeup_gdt) CC arch/x86/mm/numa_64.o CC arch/x86/mm/amdtopology.o HOSTCC arch/x86/entry/vdso/vdso2c make[4]: *** [arch/x86/realmode/rm/realmode.elf] Error 1 make[3]: *** [arch/x86/realmode/rm/realmode.bin] Error 2 make[2]: *** [arch/x86/realmode] Error 2 make[2]: *** Waiting for unfinished jobs.... Hopefully Arnaldo will have better luck. > > > > > > > > (FWIW: some other folks are hitting issues now with kernel's lack of > > > DWARF v5 support: https://bugzilla.redhat.com/show_bug.cgi?id=1922707) > > > -- > Thanks, > ~Nick Desaulniers
