[lustre-devel] zfs module taints osd_zfs and causes modprobe to fail

Christian Kuntz c.kuntz at opendrives.com
Thu Jul 29 16:31:44 PDT 2021

Hi all,

Resident crazy guy Christian here, I'm compiling lustre 2.14 on kernel
4.19.194 with ZFS 2.0.3 and running into a bit of a challenge thanks to this
kernel commit

In short, `modprobe lustre` succeeds but `modprobe osd_zfs` fails and
generates this output in dmesg:

[82645.937126] osd_zfs: module_layout: kernel tainted.
[82645.937526] osd_zfs: module uses symbols from proprietary module zfs,
inheriting taint.
[82645.938356] osd_zfs: Unknown symbol ktime_get_real_seconds (err -2)
[82645.938568] osd_zfs: Unknown symbol ktime_get_seconds (err -2)

>From what I can gather, the license taint from zfs floats up to osd_zfs,
and since osd_zfs becomes tainted as a non-GPL module it can no longer
utilize the GPL-only symbols from ktime, causing the module insertion to

As far as I can tell, my options are to either patch the taint inheritance
out of the kernel, add new functions to osd_zfs that replace the
functionality of ktim_get_real_seconds and ktime_get_seconds (honestly,
that feels a bit intimidating), or remove the gpl only requirement from
osd_zfs. Has anyone else run into this and found working solutions yet?


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