casper-sn persistence fails in 14.04.3, 15.10

[madimadi]

Reproducing:
Create fat32 bootable pendrive having the below grub entry

boot.cfg
menuentry "Run ubuntu-15.10-desktop-amd64 " {
 loopback loop /ubuntu-15.10-desktop-amd64.iso
 linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=/ubuntu-15.10-desktop-amd64.iso persistent show-cow --
 initrd (loop)/casper/initrd.lz
}

iso file is an unmodified unutu iso.

After boot into desktop, running
# echo TEST > /etc/test-file
# casper-snapshot
# cp /mnt/casper-snapshot/casper-sn.cpio.gz /media/ubuntu/<PENDRIVE_NAME>
# shutdown -r now

Boot again the same way into desktop.
# ls -l /etc/test-file
ls: cannot access /etc/test-file: No such file or directory

Hint:
#cat /upper/etc/test-file
TEST

[a1bert (a1bert)]

the same here, the new version of casper is not working properly:

there is not only problem with assembling root FS as reported above, but I am also not able to boot with persistent boot cmd:

reproduce:

-syslinuxed vfat USB stick: /casper/filesystem.squashfs,initrd.gz,vmlinuz
-persistent keyword on cmdline
-boot ends up in busybox

without "persistent" keyword, system boots ok

CAUSE:

initramfs-tools/scripts/casper: find_cow_device() called from setup_unionfs("/cdrom/casper","/root"), unmounts previously mounted /cdrom during scanning for casper-rw; /cdrom/casper/filesystem.squashfs is then not accessible for mount ...

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "dirty fix" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[a1bert (a1bert)]

use casper-snapshot -c /cow/upper