linux-kernel - Re: [REGRESSION] soft lockup on boot starting with kernel 6.10 / commit 5186ba33234c9a90833f7c93ce7de80e25fac6f5

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Message-ID: <CALvjV28edz1zzFeduytOMoVDyeXOKoxPiwcFp6Mbxz1ODSq17g@mail.gmail.com>
Date: Tue, 10 Sep 2024 11:48:15 -0700
From: Hugues Bruant <hugues.bruant@...il.com>
To: "Luck, Tony" <tony.luck@...el.com>
Cc: Borislav Petkov <bp@...en8.de>, "stable@...r.kernel.org" <stable@...r.kernel.org>, 
	"regressions@...ts.linux.dev" <regressions@...ts.linux.dev>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Yu, Fenghua" <fenghua.yu@...el.com>, 
	"Chatre, Reinette" <reinette.chatre@...el.com>, Tzung-Bi Shih <tzungbi@...nel.org>, 
	Brian Norris <briannorris@...omium.org>, Julius Werner <jwerner@...omium.org>, 
	"chrome-platform@...ts.linux.dev" <chrome-platform@...ts.linux.dev>, Jani Nikula <jani.nikula@...ux.intel.com>, 
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>, "Vivi, Rodrigo" <rodrigo.vivi@...el.com>, 
	Tvrtko Ursulin <tursulin@...ulin.net>, 
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>, 
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [REGRESSION] soft lockup on boot starting with kernel 6.10 /
 commit 5186ba33234c9a90833f7c93ce7de80e25fac6f5

On Mon, Sep 9, 2024 at 9:10 AM Luck, Tony <tony.luck@...el.com> wrote:
>
> > I have discovered a 100% reliable soft lockup on boot on my laptop:
> > Purism Librem 14, Intel Core i7-10710U, 48Gb RAM, Samsung Evo Plus 970
> > SSD, CoreBoot BIOS, grub bootloader, Arch Linux.
> >
> > The last working release is kernel 6.9.10, every release from 6.10
> > onwards reliably exhibit the issue, which, based on journalctl logs,
> > seems to be triggered somewhere in systemd-udev:
> > https://gitlab.archlinux.org/-/project/42594/uploads/04583baf22189a0a8bb2f8773096e013/lockup.log
> >
> > Bisect points to commit 5186ba33234c9a90833f7c93ce7de80e25fac6f5
>
> Does that Intel Core i7-10710U even execute the RDT code? Most client parts
> don't support RDT. You can check if yours does by looking for "rdt_a" in
> /proc/cpuinfo.
Thanks for the suggestion. You're right, I do not see `rdt_a` in `/proc/cpuinfo`