linux-ext4 - Re: simplify ext4_sb_read

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Date:   Mon, 30 May 2022 18:27:29 -0400
From:   "Stephen E. Baker" <baker.stephen.e@...il.com>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: simplify ext4_sb_read_encoding regression

On Mon, May 30, 2022 at 10:21 AM Gabriel Krisman Bertazi
<krisman@...labora.com> wrote:
>
> "Stephen E. Baker" <baker.stephen.e@...il.com> writes:
>
> > Hello,
> >
> > I have a Samsung Chromebook Plus (rk3399-gru-kevin) which boots linux
> > off an external ssd plugged into USB. The root filesystem is ext4 with
> > unicode support, case folding is enabled only on some directories in
> > my home directory.
> >
> > Since 5.17 the system has been unbootable. I ran a git bisect and it
> > pointed to aa8bf298a96acaaaa3af07d09cf7ffeb9798e48a ext4: simplify
> > ext4_sb_read_encoding
>
> Hi Stephen,
>
> This series moved the UTF-8 data tables to a kernel module; before it,
> the module had to be built-in.
>
> Since you have your rootfs as a case-insensitive filesystem, either the
> utf8data module needs to be available in the initramfs or unicode
> needs to be built-in.  Are you building your own kernel?
>
> Can you confirm that utf8data.ko exists in your initramfs, and
> regenerate it if missing?  Alternatively, make sure that you have
> CONFIG_UNICODE=y in your kernel configuration file.
>
Thanks Gabriel, I've verified that CONFIG_UNICODE=y, as well as
CONFIG_UNICODE_UTF8_DATA which exists in this patch for that
purpose, though it was removed earlier.

> If that doesn't work, can you provide the kernel log?  If you can't
> collect the console output, a photo of the screen displaying the error
> will suffice.
>
I don't have any output to provide unfortunately. It fails before the
backlight turns on, and nothing is written to disk. I seem to remember
that someone else at Collabora had figured out a way to get a serial
console on this device - perhaps Tomeu. I'm not equipped for that
personally, particularly if it involves soldering.

>
> Thank you!
>
> --
> Gabriel Krisman Bertazi