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Bug#1141434: linux-image-6.12.94+deb13-amd64: regression in loop devices

Cross-posted to 2 groups.

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On Sat, Jul 04, 2026 at 07:27:29PM +0200, Cyril Brulebois wrote:
>     root@iot-isobuilder-52:~# fallocate -l 1G foo.img
>     root@iot-isobuilder-52:~# kpartx -asv foo.img

Why kpartx and not losetup -P?  kpartx uses device mapper, while losetup
-P uses the internal partition support of the kernel.

> The foo.img file doesn't exist in the first place, it is not getting
> partitioned, and yet, we have both loop0p1 and loop0p2 coming up, with
> sizes that match the system image built previously. Another hint is that
> we have 259:0 and 259:1 as MAJ:MIN, instead of 253:0 and 253:1 when the
> system image was being worked on.

So the devices switch between possibly device-mapper (dynamically
allocated) and blkext (fixed 259).

> Looking at the changes between v6.12.90 and v6.12.94, the following one
> seems pretty plausible:
>   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3cef9aa17bf7dac59095b6972454c049a5fe97c0

The problem: this is about loop, you use device-mapper via kpartx.

Does this also happen with a current kernel?

Bastian

-- 
Another Armenia, Belgium ... the weak innocents who always seem to be
located on a natural invasion route.
		-- Kirk, "Errand of Mercy", stardate 3198.4

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Bug#1141434: linux-image-6.12.94+deb13-amd64: regression in loop devices Cyril Brulebois <kibi@debian.org> - 2026-07-04 19:30 +0200
  Bug#1141434: linux-image-6.12.94+deb13-amd64: regression in loop devices Cyril Brulebois <kibi@debian.org> - 2026-07-04 21:30 +0200
    Bug#1141434: linux-image-6.12.94+deb13-amd64: regression in loop devices Cyril Brulebois <kibi@debian.org> - 2026-07-04 23:10 +0200
  Bug#1141434: linux-image-6.12.94+deb13-amd64: regression in loop devices Bastian Blank <waldi@debian.org> - 2026-07-04 22:00 +0200
    Bug#1141434: linux-image-6.12.94+deb13-amd64: regression in loop devices Cyril Brulebois <kibi@debian.org> - 2026-07-04 22:10 +0200
      Bug#1141434: linux-image-6.12.94+deb13-amd64: regression in loop devices Bastian Blank <waldi@debian.org> - 2026-07-06 09:00 +0200
        Bug#1141434: linux-image-6.12.94+deb13-amd64: regression in loop devices Cyril Brulebois <kibi@debian.org> - 2026-07-31 19:40 +0200

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