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

Ben Hutchings <[email protected]> Mon, 22 Jul 2024 00:07:06 +0200

Newsgroups	gmane.linux.debian.devel.kernel,gmane.linux.debian.ports.powerpc,gmane.comp.debugging.dwarves
Message-ID	<[email protected]>

On Sat, 2024-07-20 at 21:45 +0200, John Paul Adrian Glaubitz wrote:
> On Sat, 2024-07-20 at 21:17 +0200, Ben Hutchings wrote:
> > I had a go yesterday and ran into the same problem.  I couldn't
> > reproduce with a small kernel config (allnoconfig + BPF + DEBUG_INFO +
> > DEBUG_INFO_BTF) and there wasn't enough disk space to build even one of
> > the Debian kernel flavours.
> > 
> > > Will take care of it and let you know when it's (some hours).
> > 
> > Thank you!
> 
> There are now 120 GB of free disk space. Let me know if that's sufficient
> or whether I need to clean up more, probably asking others to clean up
> their home directories.

I've now done 10 kernel builds on perotto (4 builds of just the
"powerpc" flavour and then 2 builds of all 3 flavours) and not
reproduced this.  I'm thinking this may be machine-dependent in some
way.

Looking again at all the build logs since DEBUG_INFO_BTF was enabled
for powerpc, we have:

Successes:

Version        Builder
----------------------------------
6.9.10-1       debian-project-be-2
6.9.7-1        debian-project-be-1
6.8.12-1       debian-project-be-2
6.8.11-1       blaauw
6.8.9-1        debian-project-be-2
6.7.12-1       blaauw
6.7.9-2        debian-project-be-2
6.7.4-1~exp1   blaauw
6.7.1-1~exp1   debian-project-be-2
6.6.15-1       blaauw
6.6.13-1       blaauw
6.6.11-1       debian-project-be-1
6.6.9-1+b1     debian-project-be-1
6.6.8-1        debian-project-be-2
6.6.4-1~exp1   blaauw
6.5.13-1       debian-project-be-1
6.5.10-1       debian-project-be-2
6.5.8-1        blaauw
6.5.6-1        debian-project-be-2
6.5.3-1        blaauw
6.5~rc7-1~exp1 debian-project-be-1
6.5~rc6-1~exp1 blaauw
6.4.13-1       blaauw
6.4.11-1       blaauw
6.4.4-3        blaauw

Failures:

Version        Builder             Failure mode
----------------------------------------------------------------------------
6.10-1~exp1    blaauw              this bug
6.9.9-1        blaauw              this bug
6.9.8-1        kapitsa             this bug
6.9.2-1~exp1   blaauw              this bug
6.8.12-1       kapitsa             this bug
6.7-1~exp1     debian-project-be-2 compiler OOM; not powerpc-specific
6.6.3-1~exp1   blaauw              kernel-wedge failed; not powerpc-specific
6.4.4-2        blaauw              out of disk space

Ignoring the unrelated failures, kapitsa has a 0% success rate (but
with only 2 attempts), blaauw an 80% success rate, and debian-project-
be-{1,2} have 100% success rates.

I don't know what differences there are between these builders that
might be relevant.

Ben.

-- 
Ben Hutchings
One of the nice things about standards is that
there are so many of them.

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