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From: Askar Safin <safinaskar@gmail.com>
To: gmazyland@gmail.com
Cc: Dell.Client.Kernel@dell.com, brauner@kernel.org,
	dm-devel@lists.linux.dev, ebiggers@kernel.org, kix@kix.es,
	linux-block@vger.kernel.org, linux-btrfs@vger.kernel.org,
	linux-crypto@vger.kernel.org, linux-lvm@lists.linux.dev,
	linux-mm@kvack.org, linux-pm@vger.kernel.org,
	linux-raid@vger.kernel.org, lvm-devel@lists.linux.dev,
	mzxreary@0pointer.de, nphamcs@gmail.com, pavel@ucw.cz,
	rafael@kernel.org, ryncsn@gmail.com, safinaskar@gmail.com,
	torvalds@linux-foundation.org
Subject: Re: dm bug: hibernate to swap located on dm-integrity doesn't work (how to get data redundancy for swap?)
Date: Fri, 24 Oct 2025 19:31:42 +0300	[thread overview]
Message-ID: <20251024163142.376903-1-safinaskar@gmail.com> (raw)
In-Reply-To: <a48a37e3-2c22-44fb-97a4-0e57dc20421a@gmail.com>

Milan Broz <gmazyland@gmail.com>:
> 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


  reply	other threads:[~2025-10-24 16:31 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-23 11:29 dm bug: hibernate to swap located on dm-integrity doesn't work (how to get data redundancy for swap?) Askar Safin
2025-10-23 20:42 ` Milan Broz
2025-10-24 16:31   ` Askar Safin [this message]
2025-10-24 17:50     ` Milan Broz
2025-10-25  5:26     ` Askar Safin
2025-10-27  8:08   ` Askar Safin
     [not found] ` <4cd2d217-f97d-4923-b852-4f8746456704@mazyland.cz>
2025-10-24 10:23   ` [PATCH] pm-hibernate: flush block device cache when hibernating Mikulas Patocka
2025-10-27  8:42     ` Askar Safin
2025-10-31 19:29       ` Mikulas Patocka
2025-10-31 19:33         ` [PATCH 1/2] pm-hibernate: flush disk cache when suspending Mikulas Patocka
2025-11-03 15:53           ` Askar Safin
2025-10-31 19:35         ` [RFC PATCH 2/2] swsusp: make it possible to hibernate to device mapper devices Mikulas Patocka
2025-10-29 13:31     ` [PATCH] pm-hibernate: flush block device cache when hibernating Rafael J. Wysocki
2025-10-29 14:38       ` Christoph Hellwig
2025-10-29 16:31         ` Mikulas Patocka

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