ZFS build fails due to kernel version

[kingsd041]

RancherOS Version: (ros os version)
v1.3.0-rc1
Where are you running RancherOS? (docker-machine, AWS, GCE, baremetal, etc.)
AWS

Starting zfs in rancheros v1.3.0-rc1 fails, when I run sudo ros service up zfs you can see the following logs

zfs_1 | checking linux distribution... debian
zfs_1 | checking default package type... deb
zfs_1 | checking whether rpm is available... no
zfs_1 | checking whether rpmbuild is available... no
zfs_1 | checking whether spec files are available... yes (rpm/generic/*.spec.in)
zfs_1 | checking whether dpkg is available... yes (1.18.24)
zfs_1 | checking whether dpkg-buildpackage is available... no
zfs_1 | checking whether alien is available... no
zfs_1 | checking spl config... all
zfs_1 | checking kernel source directory... /lib/modules/4.15.9-rancher/build
zfs_1 | checking kernel build directory... /lib/modules/4.15.9-rancher/build
zfs_1 | checking kernel source version... 4.15.9-rancher
zfs_1 | checking kernel file name for module symbols... Module.symvers
zfs_1 | checking whether debugging is enabled... no
zfs_1 | checking whether basic kmem accounting is enabled... no
zfs_1 | checking whether detailed kmem tracking is enabled... no
zfs_1 | checking whether modules can be built... no
zfs_1 | configure: error: *** Unable to build an empty module.

[niusmallnan]

It seems that zfs is not compatible with the 4.15.x kernel.
openzfs/zfs#7159

[niusmallnan]

An important user needs to use zfs, so I roll back the kernel to 4.9.x , then zfs can work fine.
Please try v1.3.0-rc2

[kingsd041]

ZFS is available in rancher v1.3.0-rc2

[ryansch]

@niusmallnan is this why 4.15.x didn't make it out? Do you have a timeline? I've intentionally not deployed a workaround for the bug we've got because 1.3.0 was right around the corner.

[niusmallnan]

Same issue in v1.4.0-rc2 with kernel 4.14.32.
I will drop the ZFS support before we fix it.

[rootwuj]

Tested with RancherOS version- v1.4.1-rc2(Kernel Version: 4.14.65-rancher) with AWS.
This version of ZFS can be installed successfully.

[niusmallnan]

Backported to v1.4.1.