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

Ben Hutchings <[email protected]> Sat, 20 Jul 2024 21:17:25 +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 09:16 +0200, John Paul Adrian Glaubitz wrote:
> Hi Domenico,
> 
> On Fri, 2024-07-19 at 23:20 +0200, Domenico Andreoli wrote:
> > > > Is there anything I can do to help?
> > > 
> > > From the 6.10-1~exp1:
> > > https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=6.10-1%7Eexp1&stamp=1721287862&raw=1
> > > file:
> > > 
> > > + LLVM_OBJCOPY=powerpc-linux-gnu-objcopy pahole -J -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func --lang_exclude=rust .tmp_vmlinux.btf
> > > 
> > > Can I have access to that .tmp_vmlinux.btf file so that I can try to
> > > reproduce it here?
> > 
> > I don't have access to the build host (blaauw2) and I've some doubts
> > it would still have that file.
> > 
> > Maybe our kernel team and powerpc porters have suggestions?
> 
> I have root access to all powerpc/ppc64 machines (buildds and porterbox).
> 
> I'm cleaning up the porterbox now, disk is quite full, then you can try
> to build the kernel package on perotto.debian.net or I can try it myself.
> 
> I have seen the bug myself and I wanted to debug it, but the attempt was
> foiled by the fact that the disk on perotto is full (again).

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!

Ben.

-- 
Ben Hutchings
This sentence contradicts itself - no actually it doesn't.

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