Please backport to the following patch which was merged upstream. It should apply to linux-5.4.y and later. commit 29be9100aca2915fab54b5693309bc42956542e5 Author: Marc Dionne <marc.dionne@xxxxxxxxxxxx>1 Date: Fri May 24 17:17:55 2024 +0100 afs: Don't cross .backup mountpoint from backup volume Don't cross a mountpoint that explicitly specifies a backup volume (target is <vol>.backup) when starting from a backup volume. It it not uncommon to mount a volume's backup directly in the volume itself. This can cause tools that are not paying attention to get into a loop mounting the volume onto itself as they attempt to traverse the tree, leading to a variety of problems. This doesn't prevent the general case of loops in a sequence of mountpoints, but addresses a common special case in the same way as other afs clients. Reported-by: Jan Henrik Sylvester <jan.henrik.sylvester@xxxxxxxxxxxxxx>Link: http://lists.infradead.org/pipermail/linux-afs/2024-May/008454.html
Reported-by: Markus Suvanto <markus.suvanto@xxxxxxxxx>Link: http://lists.infradead.org/pipermail/linux-afs/2024-February/008074.html
Signed-off-by: Marc Dionne <marc.dionne@xxxxxxxxxxxx> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>Link: https://lore.kernel.org/r/768760.1716567475@xxxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Jeffrey Altman <jaltman@xxxxxxxxxxxx> cc: linux-afs@xxxxxxxxxxxxxxxxxxx Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx> Thank you. Jeffrey Altman
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