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Date:   Sun, 10 Dec 2023 13:40:36 +0700
From:   Bagas Sanjaya <bagasdotme@gmail.com>
To:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Regressions <regressions@lists.linux.dev>,
        Linux Memory Management List <linux-mm@kvack.org>,
        Linux DRI Development <dri-devel@lists.freedesktop.org>,
        Linux Nouveau <nouveau@lists.freedesktop.org>
Cc:     Randy Dunlap <rdunlap@infradead.org>,
        Christian Brauner <brauner@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mike Rapoport <rppt@kernel.org>,
        Karol Herbst <kherbst@redhat.com>,
        Lyude Paul <lyude@redhat.com>,
        Danilo Krummrich <dakr@redhat.com>,
        Ard Biesheuvel <ardb@kernel.org>,
        Borislav Petkov <bp@alien8.de>, River <shibedrill1@gmail.com>,
        bwg <whirl@mniotilta.ca>
Subject: Re: Fwd: Kernel 6.6.1 hangs on "loading initial ramdisk"
Message-ID: <ZXVdZE3D-KFBqPnj@archie.me>
References: <9057d7de-f2e0-44ba-bec7-8b0861b2a850@gmail.com>
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On Wed, Nov 22, 2023 at 07:06:50AM +0700, Bagas Sanjaya wrote:
> Hi,
>=20
> I notice a regression report on Bugzilla [1]. Quoting from it:
>=20
> > After upgrading from 6.5.9 to 6.6.1 on my Dell Latitude E6420 (Intel i5=
-2520M) with EndeavourOS, the boot process would hang at "loading initial r=
amdisk". The issue is present on the 6.6.1 release of both Linux and Linux-=
zen, but not the 6.5.9 release, which makes me think this is somehow upstre=
am in the kernel, rather than to do with packaging. My current workaround i=
s using the Linux LTS kernel.
> >=20
> > I have been unable to consistently reproduce this bug. Between 50 and 3=
0 percent of the time, the "loading initial ramdisk" will display, the disk=
 activity indicator will turn off briefly and then resume blinking, and the=
n the kernel boots as expected. The other 50 to 70 percent of the time, the=
 boot stops at "loading initial ramdisk" and the disk activity indicator tu=
rns off, and does not resume blinking. The disk activity light is constantl=
y flashing during normal system operation, so I know it's not secretly boot=
ing but not updating the display. I haven't been able to replicate this iss=
ue in QEMU. I have seen similar bugs that have been solved by disabling IOM=
MU, but this has not had any effect. Neither has disabling graphics drivers=
 and modesetting. I have been able to reproduce it while using Nouveau, so =
I don't believe it has to do with Nvidia's proprietary drivers.
> >=20
> > Examining dmesg and journalctl, there doesn't appear to be ANY logs fro=
m the failed boots. I don't believe the kernel even is started on these fai=
led boots. Enabling GRUB debug messages (linux,loader,init,fs,device,disk,p=
artition) shows that the hang occurs after GRUB attempts to start the loade=
d image- it's able to load the image into memory, but the boot stalls after=
 "Starting image" with a hex address (presumably the start addr of the kern=
el). =20
> >=20
> > I've been trying to compile the kernel myself to see if I can solve the=
 issue, or at least aid in reproduceability, but this is not easy or fast t=
o do on a 2012 i5 processor. I'll update if I can successfully recompile th=
e kernel and if it yields any information. =20
> >=20
> > Please let me know if I should provide any additional information. This=
 is my first time filing a bug here.
>=20
> See Bugzilla for the full thread and attached grub output.
>=20
> Anyway, I'm adding this regression to regzbot:
>=20
> #regzbot introduced: v6.5..v6.6 https://bugzilla.kernel.org/show_bug.cgi?=
id=3D218173
> #regzbot title: initramfs loading hang on nouveau system (Dell Latitude E=
6420)
>=20

Another reporter on Bugzilla had bisected the regression, so:

#regzbot introduced: a1b87d54f4e45f

Thanks.

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

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