LVM merging from snapshots don't work.
I have two logical volume - one is for the entire system and one is a snapshot that I have created if I want to revert things if an upgrade breaks them.
This is the output of *lvs*
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert before_upgrade vgfedora swi-a-s--- 30.00g fedora 22.84
fedora vgfedora owi-aos--- 50.00g
Now I perform my upgrade by running *sudo dnf upgrade -y*, the upgrade completes without any problems.
Now if I want to revert back to my old system state that is the snapshot *before_upgrade*, I boot into a Live Fedora 31 environment and open my encrypted partition using
$ cryptsetup open /dev/sda3 dm_crypt
And I issue the command:
$ lvconvert --merge /dev/vgfedora/before_upgrade
This works as expected until it hits 100%:
vgfedora/fedora: Merged: 99.59% vgfedora/fedora: Merged: 99.90% vgfedora/fedora: Merged: 100.00%
It hangs completely.
It has been almost 3 hours and I have not seen the status change.
Hitting *Ctrl + C* now will produce the following output:
^C Interrupted... Giving up waiting for lock. Can't get lock for vgfedora Can't reread VG for vgfedora/fedora error flags 2
If I reboot the restoration has not been done and the logical volume *before_upgrade* has vanished.
Here is my layout:
lsblk -f
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT sda ├─sda1 │ ext4 2ea20bf9-ee56-490f-b12d-bd8d34e2fa3f 694.3M 22% /boot └─sda2 crypto b09a1a64-9b05-4c23-b048-1eacd03cf60b └─luks-b09a1a64-9b05-4c23-b048-1eacd03cf60b LVM2_m B0i0fa-Yxme-Yntt-9uwM-VpFU-3xSB-K774pD ├─vgfedora-fedora-real │ │ ├─vgfedora-fedora │ │ ext4 root 1176ad7d-d3e7-4062-b799-8e2b761f10af 39.5G 14% / │ └─vgfedora-before_upgrade │ ext4 root 1176ad7d-d3e7-4062-b799-8e2b761f10af └─vgfedora-before_upgrade-cow
└─vgfedora-before_upgrade ext4 root 1176ad7d-d3e7-4062-b799-8e2b761f10af
What is going on ?
Interestingly I have tried the same thing in other distributions like Ubuntu and this works. So seems like a Fedora specific issue.
Let me know if any other information is required, like any other log files.
Thanks.