linux-kernel - Re: Cache coherency bug: stale reads on /dev/sda1

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Date:   Sun, 27 Aug 2023 08:03:49 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Joshua Hudson <joshudson@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux IDE and libata <linux-ide@...r.kernel.org>
Cc:     Hans de Goede <hdegoede@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Damien Le Moal <dlemoal@...nel.org>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: Cache coherency bug: stale reads on /dev/sda1

On Sat, Aug 26, 2023 at 02:59:45PM -0700, Joshua Hudson wrote:
> uname -a
> Linux nova 6.4.12 #1 SMP PREEMPT_DYNAMIC Sat Aug 26 09:11:27 PDT 2023
> x86_64 GNU/Linux
> 
> Kernel source is
> https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/linux-6.4.12.tar.xz
> 
> Can reliably reproduce as follows:
> 
> # hexedit /dev/sda1 (this is my EFI partition)
> PgDn
> # hexedit /dev/sda
> G 100000  (your value may vary--we want to seek to the start of the
> EFI partition)
> PgDn
> PgDn
> ^C
> write a marker to the padding between the BPB and the first FAT sector.
> (If your system doesn't have one, edit an error message in the boot sector)
> ^X
> # hexedit /dev/sda1
> PgDn
> Look for marker written above, find it's not there !!!
> ^C
> 
> I discovered this one trying to defragment my EFI partition after a
> grub upgrade left it very fragmented due to replacing logos.

Are you sure this is hardware issue?

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

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