On Wed, Dec 30, 2020 at 11:19:36AM -0300, Arnaldo Carvalho de Melo wrote:

Em Wed, Dec 30, 2020 at 02:28:52PM +0100, Jiri Olsa escreveu:

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On Wed, Dec 30, 2020 at 02:28:02PM +0100, Jiri Olsa wrote:

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On Wed, Dec 30, 2020 at 10:03:37AM +0100, Jiri Olsa wrote:

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On Tue, Dec 29, 2020 at 11:28:35PM +0000, Qais Yousef wrote:

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Hi Jiri

On 12/29/20 18:34, Jiri Olsa wrote:

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On Tue, Dec 29, 2020 at 03:13:52PM +0000, Qais Yousef wrote:

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Hi

When I enable CONFIG_DEBUG_INFO_BTF I get the following error in the BTFIDS
stage

	FAILED unresolved symbol udp6_sock

I cross compile for arm64. My .config is attached.

I managed to reproduce the problem on v5.9 and v5.10. Plus 5.11-rc1.

Have you seen this before? I couldn't find a specific report about this
problem.

Let me know if you need more info.

hi,
this looks like symptom of the gcc DWARF bug we were
dealing with recently:

  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97060
  https://lore.kernel.org/lkml/CAE1WUT75gu9G62Q9uAALGN6vLX=o7vZ9uhqtVWnbUV81DgmFPw@mail.gmail.com/#r (local)

what pahole/gcc version are you using?

I'm on gcc 9.3.0

	aarch64-linux-gnu-gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0

I was on pahole v1.17. I moved to v1.19 but I still see the same problem.

There are some changes post v1.19 in the git repo:

[acme@five pahole]$ git log --oneline v1.19..
b688e35970600c15 (HEAD -> master) btf_encoder: fix skipping per-CPU variables at offset 0
8c009d6ce762dfc9 btf_encoder: fix BTF variable generation for kernel modules
b94e97e015a94e6b dwarves: Fix compilation on 32-bit architectures
17df51c700248f02 btf_encoder: Detect kernel module ftrace addresses
06ca639505fc56c6 btf_encoder: Use address size based on ELF's class
aff60970d16b909e btf_encoder: Factor filter_functions function
1e6a3fed6e52d365 (quaco/master) rpm: Fix changelog date
[acme@five pahole]$

But I think these won't matter in this case :-\

yep, it did not.. I used the latest dwarves code

jirka