linux-kernel - Re: [PATCH v4] Makefile.compiler: replace cc-ifversion with compiler-specific macros

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Date:   Thu, 18 May 2023 16:23:13 +0200
From:   Ricardo Cañuelo <ricardo.canuelo@...labora.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Shreeya Patel <shreeya.patel@...labora.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <llvm@...ts.linux.dev>,
        Bill Wendling <morbo@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        regressions@...ts.linux.dev,
        "gustavo.padovan\@collabora.com" <gustavo.padovan@...labora.com>,
        Guillaume Charles Tucker <guillaume.tucker@...labora.com>,
        denys.f@...labora.com, kernelci@...ts.linux.dev
Subject: Re: [PATCH v4] Makefile.compiler: replace cc-ifversion with compiler-specific macros

Hi Nick,

On mié, may 17 2023 at 09:27:41, Nick Desaulniers <ndesaulniers@...gle.com> wrote:
> Shreeya mentioned upthread that `qemu_arm-virt-gicv3-uefi` was
> failing, so I assume others should be able to repro in qemu. I'd guess
> that LAVA lets you have VMs adjacent to physical hardware.  Having the
> qemu command line, kernel config, and perhaps the initramfs are going
> to be the three most useful things for any similar bug report.

Sure, I'm using LAVA because that's the safest way to match exactly the
same setup from the original test, but anyone can try to reproduce it on
their own. You can get the job info and setup from any of the related
LAVA jobs. This one for example:
https://lava.collabora.dev/scheduler/job/10373216

Trying to reproduce this type of setups is not as straightforward as
we'd like, specially for people not familiar with KernelCI, but we're
putting in some effort to improve that so that anyone can pick up a
regression report and work on it right away.

By the way, I found a breaking point in the commit right after the one
that the bisector reported:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5750121ae7382ebac8d47ce6d68012d6cd1d7926
but I can't find anything there either that makes the boot hang,
specifically for configs including kernel/configs/debug.config. I
wouldn't rule out a problem with the qemu configuration.

Anyway, this is not a critical problem in any way, although it'd be
interesting to find the cause in case we can use the findings to improve
the test setups.

Cheers,
Ricardo