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From: "Joan Bruguera Micó" <joanbrugueram@gmail.com>
To: jpoimboe@kernel.org
Cc: i.pear@outlook.com, acme@kernel.org, alan.maguire@oracle.com,
	alexandref75@gmail.com, bpf@vger.kernel.org, dxu@dxuuu.xyz,
	jforbes@redhat.com, linux-kernel@vger.kernel.org,
	olsajiri@gmail.com, peterz@infradead.org, ptalbert@redhat.com,
	yhs@fb.com
Subject: Re: [PATCH] vmlinux.lds.h: Force-align ELF notes section to four bytes
Date: Thu, 27 Apr 2023 05:14:10 +0000	[thread overview]
Message-ID: <20230427051410.2054787-1-joanbrugueram@gmail.com> (raw)
In-Reply-To: <20230416185204.2592590-1-joanbrugueram@gmail.com>

PS: As additional information for posterity, there are various conditions that
explain why this is/was only a problem on some specific distributions:

* In addition to dwarves/pahole 1.24, binutils 2.40 seems to also be required
  for the problem to occur (in Arch, downgrading to binutils 2.39 fixes it).
* Debian (and thus derived distributions) configures binutils with
  `--disable-x86-used-note`, which by default disables emitting the GNU notes
  which ultimately cause the .notes section to be aligned to 8 bytes.

  On Debian Bookworm & Ubuntu 23.04, the problem reproduces when building like:
  ```
  export KCFLAGS="-Xassembler -mx86-used-note=yes"
  export KAFLAGS="-Xassembler -mx86-used-note=yes"
  make
  ```

Finally, here's a smaller .config to reproduce the problem on affected systems:
https://zealcharm.com/20230416-btf-dedup-bug-sample-configs/minimal-repro

  reply	other threads:[~2023-04-27  5:14 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-22 17:48 Kernel build fail with 'btf_encoder__encode: btf__dedup failed!' Daniel Xu
2023-01-22 21:25 ` Daniel Xu
2023-01-23  8:06 ` Jiri Olsa
2023-01-24  6:13   ` Daniel Xu
2023-01-27 22:28     ` Alexandre Peixoto Ferreira
2023-01-28  0:00       ` Jiri Olsa
2023-01-28  0:21         ` Daniel Xu
2023-01-28  0:23           ` Daniel Xu
2023-01-28 19:23         ` Alexandre Peixoto Ferreira
2023-01-31 15:18           ` Jiri Olsa
2023-02-09  0:21             ` Vicki Pfau
2023-02-09  4:15             ` Alexandre Peixoto Ferreira
2023-02-09 13:07               ` Alan Maguire
2023-02-10 14:02                 ` Alexandre Peixoto Ferreira
2023-02-10 14:34                   ` Jiri Olsa
2023-02-10 15:37                     ` Alexandre Ferreira
2023-02-14  6:33                       ` Tianyi Liu
2023-04-11 17:00                         ` [PATCH] vmlinux.lds.h: Force-align ELF notes section to four bytes Josh Poimboeuf
2023-04-12  7:10                           ` Tianyi Liu
2023-04-12 16:30                             ` Josh Poimboeuf
2023-04-13  2:21                               ` Joan Bruguera Micó
2023-04-13  9:23                                 ` Tianyi Liu
2023-04-13 18:59                                   ` [PATCH] vmlinux.lds.h: Discard .note.gnu.property section Josh Poimboeuf
2023-04-16 19:02                                     ` Joan Bruguera Micó
2023-04-18 21:47                                       ` Josh Poimboeuf
2023-04-18 21:49                                         ` [PATCH v2] " Josh Poimboeuf
2023-04-13  4:54                               ` [PATCH] vmlinux.lds.h: Force-align ELF notes section to four bytes Tianyi Liu
2023-04-16 18:52                                 ` Joan Bruguera Micó
2023-04-27  5:14                                   ` Joan Bruguera Micó [this message]
2023-05-18 11:00 ` [tip: objtool/urgent] vmlinux.lds.h: Discard .note.gnu.property section tip-bot2 for Josh Poimboeuf

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