I can confirm that this is still an issue in Ubuntu 14.04.4. I ran into
this problem trying to backup a server hosting lxc containers, some of
them using overlayfs as the root fs. When the containers are running
(and therefore overlayfs is mounted) lvcreate -s hangs forever. The
debug output is:
I did a little more testing.
root@virt:~# uname -r
3.13.0-32-generic
Actually the hanging seams to happen only when the overlayfs parts are on the
logical volume being the snapshot source.
Let's say /opt is a logical volume in the volume group virt.
Case 1 (hanging):
mkdir /opt/test/
cd
Update:
I tried to find a work around by using aufs.
To make a long story short: There seams to be the same issue.
mkdir /tmp/dir1 /tmp/aufs-root
mount -t aufs -o br=/tmp/dir1:/home/test,xino=/dev/shm/aufs.xino none
/tmp/aufs-root
lvcreate -s -L 5G /dev/virt/opt -n vm_backup
- Hang
dmesg
When I do the steps:
sudo apt-get update
sudo apt-get dist-upgrade
I do not get a new kernel.
Anyway, the Kernel version on the system seams to be more current then the one
mentioned in the post above:
df@feretti-virt:~$ uname -r
3.13.0-29-generic
So either I am missing something or the bug
As mentioned I already tested with a Kernel from 13.10 with the same
result.
To be sure I installed a minimal Ubuntu 13.10 in a virtual machine and did the
steps to reproduce the issue.
- The Problem existed in 13.10 as well.
df@ubuntu-bug-check:~$ cat /etc/issue
Ubuntu 13.10 \n \l
sudo mount -t
Thank you for taking the time to file a bug report on this issue.
However, given the number of bugs that the Kernel Team receives during
any development cycle it is impossible for us to review them all.
Therefore, we occasionally resort to using automated bots to request
further testing. This is
Did this issue occur in a previous version of Ubuntu, or is this a new
issue?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.15 kernel[0].
If this bug is fixed in the mainline kernel, please add
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