https://bugzilla.kernel.org/show_bug.cgi?id=60674
--- Comment #9 from Yves G. (theYinYeti) yg.do@sfr.fr --- Sorry for the long time without an answer; I was on holidays. Just to be clear: the kernel (and associated packages for my setup) is the only component that changes; here’s the exact list: linux, linux-headers, spl-utils, spl, zfs-utils, zfs, virtualbox-host-modules.
I don’t know how to “bissect” and all this stuf. However, I will try the patch suggested by Alex; thanks, by the way :)