Re: Bug#1076564: pahole BTF processing seems flaky on powerpc

[Domenico Andreoli <cavok@debian.org>]

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Hi Arnaldo,

On Thu, Jul 18, 2024 at 11:56:09PM +0200, Ben Hutchings wrote:
> Package: pahole
> Version: 1.27-1
> Severity: normal
> X-Debbugs-Cc: debian-kernel@lists.debian.org
> 
> Several kernel builds on powerpc have failed recently:
> 
> 6.8.12-1:    https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=6.8.12-1&stamp=1717234422&raw=1
> 6.9.9-1:     https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=6.9.9-1&stamp=1720906547&raw=1
> 6.10-1~exp1: https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=6.10-1%7Eexp1&stamp=1721287862&raw=1
> 
> Note, these log files are up to 270 MB in size and should be
> downloaded; at least Firefox becomes unresponsive when trying to
> display them.
> 
> For each of these, the failure seems to start with an error from
> pahole such as:
> 
>     [102044] ARRAY (anon) type_id=99491 index_type_id=14 nr_elems=12 Error emitting BTF type
>     Encountered error while encoding BTF.

Does the above error ring any bell?

Is there anything I can do to help?

> 
> This does *not* happen consistently.  Compare these successful
> builds:
> 
> 6.8.12-1:    https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=6.8.12-1&stamp=1717278092&raw=1
> - This same version failed to build on the first try.
> 6.9.7-1:     https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=6.9.7-1&stamp=1719538806&raw=1
> - Earlier and later 6.9.x versions failed to build.
> 
> Both pahole versions 1.26-1 and 1.27-1 have been used in both
> successful and failing builds.
> 
> Ben.
> 
> -- System Information:
> Debian Release: trixie/sid
>   APT prefers unstable-debug
>   APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'stable-security'), (500, 'oldstable-updates'), (500, 'oldstable-security'), (500, 'oldoldstable-updates'), (500, 'oldoldstable'), (500, 'unstable'), (500, 'stable'), (500, 'oldstable'), (1, 'experimental')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
> 
> Kernel: Linux 6.9.9-amd64 (SMP w/12 CPU threads; PREEMPT)
> Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE not set
> Shell: /bin/sh linked to /usr/bin/dash
> Init: systemd (via /run/systemd/system)
> LSM: AppArmor: enabled
> 
> Versions of packages pahole depends on:
> ii  libbpf1     1:1.4.3-1
> ii  libc6       2.39-4
> ii  libdw1t64   0.191-2
> ii  libelf1t64  0.191-2
> ii  zlib1g      1:1.3.dfsg+really1.3.1-1
> 
> pahole recommends no packages.
> 
> pahole suggests no packages.
> 
> -- debconf-show failed

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ed25519: FFB4 0CC3 7F2E 091D F7DA  356E CC79 2832 ED38 CB05

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