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Date:   Sat, 1 Jul 2023 19:27:13 +0700
From:   Bagas Sanjaya <bagasdotme@gmail.com>
To:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Regressions <regressions@lists.linux.dev>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Rick Edgecombe <rick.p.edgecombe@intel.com>,
        Borislav Petkov <bp@alien8.de>
Subject: Re: Fwd: commit 9df9d2f0471b causes boot failure in pre-rc1 6.5
 kernel
Message-ID: <ZKAboYIj6pAd9CMO@debian.me>
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On Wed, Jun 28, 2023 at 09:06:22PM +0700, Bagas Sanjaya wrote:
> Hi,
>=20
> I notice a regression report on Bugzilla [1]. Quoting from it:
>=20
> > Since yesterday my builds of the https://git.kernel.org/pub/scm/linux/k=
ernel/git/torvalds/linux.git no longer boot with a black screen immediately=
 upon booting. Today I finished git bisecting the issue and arrived at the =
following:
> >=20
> > 9df9d2f0471b4c4702670380b8d8a45b40b23a7d is the first bad commit
> > commit 9df9d2f0471b4c4702670380b8d8a45b40b23a7d
> > Author: Thomas Gleixner <tglx@linutronix.de>
> > Date:   Wed Jun 14 01:39:39 2023 +0200
> >=20
> >     init: Invoke arch_cpu_finalize_init() earlier
> >    =20
> >     X86 is reworking the boot process so that initializations which are=
 not
> >     required during early boot can be moved into the late boot process =
and out
> >     of the fragile and restricted initial boot phase.
> >    =20
> >     arch_cpu_finalize_init() is the obvious place to do such initializa=
tions,
> >     but arch_cpu_finalize_init() is invoked too late in start_kernel() =
e.g. for
> >     initializing the FPU completely. fork_init() requires that the FPU =
is
> >     initialized as the size of task_struct on X86 depends on the size o=
f the
> >     required FPU register buffer.
> >    =20
> >     Fortunately none of the init calls between calibrate_delay() and
> >     arch_cpu_finalize_init() is relevant for the functionality of
> >     arch_cpu_finalize_init().
> >    =20
> >     Invoke it right after calibrate_delay() where everything which is r=
elevant
> >     for arch_cpu_finalize_init() has been set up already.
> >    =20
> >     No functional change intended.
> >    =20
> >     Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> >     Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
> >     Link: https://lore.kernel.org/r/20230613224545.612182854@linutronix=
=2Ede
> >=20
> >  init/main.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >=20
> > Since it might be relevant, my CPU is Intel Core i5-12400 with UEFI fro=
m december 2022 and the compiler is gcc (Gentoo Hardened 13.1.1_p20230527 p=
3) 13.1.1 20230527. If additional information such as the kernel configurat=
ion is required, let me know.
>=20
> See Bugzilla for the full thread.
>=20
> The reporter can't provide requested dmesg due to this is early
> boot failure, unfortunately.
>=20
> Nevertheless, this regression has already been taken care of on
> Bugzilla, but to ensure it is tracked and doesn't get fallen through
> cracks unnoticed, I'm adding it to regzbot:
>=20
> #regzbot introduced: 9df9d2f0471b https://bugzilla.kernel.org/show_bug.cg=
i?id=3D217602
> #regzbot title: early arch_cpu_finalize_init() cause immediate boot failu=
re
>=20

#regzbot fix: 0303c9729afc40

--=20
An old man doll... just what I always wanted! - Clara

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