Re: Persistence through Sleep for Mounted LUKS Encrypted USB devices

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On Sat, Nov 6, 2021 at 1:00 PM Onyeibo <onyeibo@xxxxxxxxxxxxxxxx> wrote:
>
> Greetings,
>
> My laptop enters a sleep state when I close the lid (monitor).  That is
> normal.
>
> However, if I mounted a LUKS-encrypted device connected via a USB port,
> the session breaks when the machine wakes.  Is that still normal?  BASH
> tells me that the mount point is engaged, whereas the device has been
> relabelled (from /dev/sdc to /dev/sdd or something else).  The "lsblk"
> command indicates that the device is not mounted anymore.  Of course,
> that disrupts any process accessing the USB storage device when I close
> the lid.
>
> The troubling part is that the mount point stays busy as though it is
> mounted.  Trying to umount is futile (umount: /mnt/usb: target is
> busy.).  How do I break out of this?  I still ask, Is this the design,
> or should I be reporting a bug?
>
> Regards
> Onyeibo
>
> ----------
> uname -a:
>
>  5.15.0-0.rc6.47.fc36.x86_64 #1 SMP Mon Oct 18 17:11:29 UTC 2021 x86_64
>  x86_64 x86_64 GNU/Linux

It's a good question. I know that /dev device nodes are not reliable
between boots. But between suspend (s2idle or S3) modes it should be?
But that's a question for kernel developers, and I guess the place to
start this is on the linux-usb@ list and see if /dev is supposed to be
consistent through suspend-to-ram.



-- 
Chris Murphy
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