Public bug reported:
I'm using Ubuntu 25.04.
This was working with this Ubuntu version a few weeks ago, and failed with a
recent update.
I have an image of an SD-card within a squashfs container. This SD card
is partitioned, so the image contains a partition table.
What I'm doing:
> mkdir -p /tmp/mnt/sqfs
> mkdir -p /tmp/mnt/img
> sudo mount container.sqfs /tmp/mnt/sqfs
> sudo losetup -Pf /tmp/mnt/sqfs/sd-card.img
What I would expect to happen:
A loopback device gets created with the partitions of the SD-card image. I
could then mount those loopback devices to (read only) access their content
without extracting the image from squashfs.
What instead happens:
losetup: /tmp/mnt/sqfs/sd-card.img: failed to set up loop device: Invalid
argument
After this, I can't even unmount the squashfs container anymore:
> sudo umount /tmp/mnt/sqfs
umount: /tmp/mnt/sqfs: target is busy.
Copying the image file out of the squashfs mountpoint (extracting it)
works. And then I can successfully create the loopback device on that
extracted image file. It just doesn't work within the mounted squashfs.
I've used this a lot in the past, so I'm certain this was working.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2120963
Title:
losetup fails on image file within squashfs
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