Re: dm bug: hibernate to swap located on dm-integrity doesn't work (how to get data redundancy for swap?)

Askar Safin <[email protected]> Fri, 24 Oct 2025 19:31:42 +0300

Newsgroups	dev.linux.lists.lvm-devel,dev.linux.lists.dm-devel,dev.linux.lists.linux-lvm,org.kernel.vger.linux-block,org.kernel.vger.linux-btrfs,org.kernel.vger.linux-crypto,org.kernel.vger.linux-pm,org.kernel.vger.linux-raid,org.kvack.linux-mm
Message-ID	<[email protected]>

Milan Broz <[email protected]>:
> Hi,

I just wrote script for reproduction of this bug in Qemu:
https://zerobin.net/?4e742925aedbecc6#BX3Tulvp7E3gKhopFKrx/2ZdOelMyYk1qOyitcOr1h8=

Just run it, and you will reproduce this bug, too.

Also, I just reproduced it on current master (43e9ad0c55a3).

Here is output of this script on master:
https://zerobin.net/?68ef6601ab203a11#7zBZ44AaVKmvRq161MJaOXIXY/5Hiv+hRUxWoqyZ7uE=

As you can see, hibernate succeeds, but resume fails so:

+ blkid --match-tag TYPE --output value /dev/mapper/early-swap
+ TYPE=swap
+ echo 'Type: swap'
Type: swap
+ echo /dev/mapper/early-swap
[    0.446545] PM: Image not found (code -22)

Also, I just noticed that the bug sometimes reproduces, and sometimes not.
Still it reproduces more than 50% of time.

Also, you will find backtrace in logs above. Disregard it. I think this
is just some master bug, which is unrelated to our dm-integrity bug.

I will answer to rest of your letter later.

Also, I saw patch, I will test it later.

-- 
Askar Safin