Description says it all. An update to the latest testing of zfs, spl, and zfs-kmod (currently 0.6.5.8-r1), and update to the latest hardened-sources (currently 4.7.10), zfs will not load through mod probe, citing "invalid argument". Every time I have had to roll back to 0.6.5.6 and 4.4.8-r1. After looking through kernel messages, module spl fails to load with "no symbol version for zlib_deflate{,End,_workspacesize,Init2} (and subsequent Unknown Symbol zlib_deflate (error -22).
Thank you for the report, please use the full package name next time.
all current ebuilds already require it, old ebuilds are gone. closing.