On Wed, Feb 3, 2021 at 5:31 PM Nick Desaulniers [off-list ref] wrote:

On Sun, Jan 17, 2021 at 12:14 PM Arnaldo Carvalho de Melo
[off-list ref] wrote:

quoted

Em Fri, Jan 15, 2021 at 03:43:06PM -0800, Yonghong Song escreveu:

quoted

On 1/15/21 3:34 PM, Nick Desaulniers wrote:

quoted

On Fri, Jan 15, 2021 at 3:24 PM Yonghong Song [off-list ref] wrote:

quoted

On 1/15/21 1:53 PM, Sedat Dilek wrote:

quoted

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?

quoted

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 [off-list ref],
dwarves@vger.kernel.org and bpf@vger.kernel.org.

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?

(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