linux-kernel - ext4 bug?

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Date:   Mon, 20 Nov 2023 15:02:50 +0100
From:   Jörg-Volker Peetz <jvpeetz@....de>
To:     linux-kernel@...r.kernel.org
Cc:     Jan Kara <jack@...e.com>, Theodore Ts'o <tytso@....edu>
Subject: ext4 bug?

Hi,
some files got there modification timestamp changed to 'Sun  6 Jan 16:04:34 CET 
2109' out of a blue. One directory has modification time stamp 'Sun  6 Jan 
15:40:00 CET 2109' and three files have 'Sun  6 Jan 16:01:22 CET 2109', 'Sun  6 
Jan 16:04:20 CET 2109', and 'Sun  6 Jan 12:56:02 CET 2109'.
This was observed recently during a backup. A check with
   find /usr -newermt 2023-11-21
found several (ca. 30) files and directories in '/usr', '/var', and in another 
partition '/home'. About 14 of the files are 'index.db' in '/var/cache/man'
This is a server running kernel 6.6.1 when this happened.
I have no clue why that happened and no idea how to reproduce.
What could cause this?

Regards,
Jörg.