[dm-devel] [PATCH] udev: create symlinks and watch even in suspended state

[Martin Wilck]

On Fri, 2022-01-28 at 16:57 +0100, Martin Wilck wrote:
> 
> It's a race condition. It probably happens while multipathd is
> reloading a map (*), suspending it during the table reload. The
> device
> will be resumed a few fractions of a second later (so yes, it's
> "quick"), but then it's too late

More precisely: The suspend state itself may actually not last longer
than a few ms. But once the symlink is bent to point to the wrong
device, it will remain so, until the CHANGE event following the device
resume is successfully processed by udev, which may happen
substantially later. And it's that longer time span which matters for
systemd's mount attempt (or LVM device activation, for that matter).

Martin