Hey all,

I ran in the same problem. I removed the ZFS repo of ZFS itself. I installed the Fedora version, after that the ZFS pool was unable to be mounted (something with dependencies of features). 

I then proceeded to remove everything of ZFS on my system and installed again the ZFS repository. This turned out to be the winning move. Why? I don't know, but the ZFS packages of the repository compiles something. So, my bet it does something to the kernel and with the upgrade of Fedora 23 it got broken.

Installed packages ATM:
libnvpair1.x86_64                     0.6.5.4-1.fc23            @zfs           
libuutil1.x86_64                      0.6.5.4-1.fc23            @zfs           
libzfs2.x86_64                        0.6.5.4-1.fc23            @zfs           
libzpool2.x86_64                      0.6.5.4-1.fc23            @zfs           
spl.x86_64                            0.6.5.4-1.fc23            @zfs           
spl-dkms.noarch                       0.6.5.4-1.fc23            @zfs           
zfs.x86_64                            0.6.5.4-1.fc23            @zfs           
zfs-dkms.noarch                       0.6.5.4-1.fc23            @zfs           
zfs-release.noarch                    1-4.fc23                  @@commandline

Repository:
[zfs]
name=ZFS on Linux for Fedora $releasever
baseurl=http://archive.zfsonlinux.org/fedora/$releasever/$basearch/
enabled=1
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-source]
name=ZFS on Linux for Fedora $releasever - Source
baseurl=http://archive.zfsonlinux.org/fedora/$releasever/SRPMS/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-testing]
name=ZFS on Linux for Fedora $releasever - Testing
baseurl=http://archive.zfsonlinux.org/fedora-testing/$releasever/$basearch/
enabled=0
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-testing-source]
name=ZFS on Linux for Fedora $releasever - Testing Source
baseurl=http://archive.zfsonlinux.org/fedora-testing/$releasever/SRPMS/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux


On 02/10/2016 09:28 AM, Chris Murphy wrote:


On Tue, Feb 9, 2016, 11:58 PM thibaut noah <thibaut.noah@gmail.com> wrote:
That's exactly what i did and it ain't working


I suggest filling an issue ticket with upstream, or ask on their list or forum.


Chris Murphy