Errors and warnings when updating ZFS on CentOS 7

[zhro]

After performing a yum update which included kernel updates, ZFS was unable to load after a reboot. Failure to reinstall it seemed to stem modules building from the wrong kernel source.

I performed a rpm -qa | grep kernel and removed old kernel-devel and kernel-headers, then ran the following:

yum remove libzfs2 dkms zfs-dkms zfs zfs-release spl spl-dkms
yum localinstall --nogpgcheck http://archive.zfsonlinux.org/epel/zfs-release.el7.noarch.rpm
yum install libzfs2 dkms zfs-dkms zfs zfs-release spl spl-dkms -y | tee zfs-log

ZFS is now working again but the log reported many warnings and errors:

http://pastebin.com/raw.php?i=GL64JP7x

Should I be worried about this?

[behlendorf]

They warning indicate a problem creating the symlinks for weak modules. This means if you boot to a different kernel you won't be able to load the ZFS modules without rebuilding them for it. Beyond that they're not a reason for concern.