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Date: Fri, 26 Mar 2021 19:01:33 +0100
From: Daniel Kiper <dkiper@net-space.pl>
To: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: The development of GNU GRUB <grub-devel@gnu.org>,
 Sergei Trofimovich <slyfox@gentoo.org>,
 debian-ia64 <debian-ia64@lists.debian.org>
Subject: Re: GRUB error: unknown filesystem on ia64
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Hey Adrian,

On Wed, Mar 17, 2021 at 07:22:02PM +0100, John Paul Adrian Glaubitz wrote:
> Hello!
>
> It seems that one of the security patches has caused a regression on ia64 as
> GRUB is no longer able to load any basic commands:
>
> Loading.: grub
> Starting: grub
> Welcome to GRUB!
> error: unknown filesystem.
> Entering rescue mode...
> grub rescue> insmod ext2
> error: unknown filesystem.
> grub rescue> help
> Unknown command `help'.
> grub rescue> ?
> Unknown command `?'.
> grub rescue> linux
> Unknown command `linux'.
> grub rescue>
>
> I have not bisected the issue yet, but maybe anyone has got any idea?

May I ask you to do a bisect for us?

Daniel