The stable branch on the ZOL github page has a release for zfs-2.0.0-rc4 which includes support for kernel 5.9 an ebuild for the 0.8.x branch was already bumped to include support for kernel 5.9
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=deb9e6f71eb7d1b6372cbcfc12400f3ed1816cb5 commit deb9e6f71eb7d1b6372cbcfc12400f3ed1816cb5 Author: Georgy Yakovlev <gyakovlev@gentoo.org> AuthorDate: 2020-10-22 02:28:42 +0000 Commit: Georgy Yakovlev <gyakovlev@gentoo.org> CommitDate: 2020-10-22 02:35:01 +0000 sys-fs/zfs-kmod: bump to 2.0.0_rc4 Closes: https://bugs.gentoo.org/750689 Package-Manager: Portage-3.0.8, Repoman-3.0.2 Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org> sys-fs/zfs-kmod/Manifest | 1 + sys-fs/zfs-kmod/zfs-kmod-2.0.0_rc4.ebuild | 175 ++++++++++++++++++++++++++++++ 2 files changed, 176 insertions(+) Additionally, it has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=8a1b9925dfb4582e848350df14ed12016df00b3a commit 8a1b9925dfb4582e848350df14ed12016df00b3a Author: Georgy Yakovlev <gyakovlev@gentoo.org> AuthorDate: 2020-10-22 02:30:10 +0000 Commit: Georgy Yakovlev <gyakovlev@gentoo.org> CommitDate: 2020-10-22 02:35:01 +0000 sys-fs/zfs: bump to 2.0.0_rc4 Bug: https://bugs.gentoo.org/750689 Package-Manager: Portage-3.0.8, Repoman-3.0.2 Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org> sys-fs/zfs/Manifest | 1 + sys-fs/zfs/zfs-2.0.0_rc4.ebuild | 229 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 230 insertions(+)