zfs-2.1.15 don't compile with Centos last kernel-5.14.0-446.el9.x86_64

[smusich]

<checking whether bio_alloc() wants 4 args... yes
checking whether blkdev_get_by_path() exists and takes 3 args... no
checking whether blkdev_get_by_path() exists and takes 4 args... no
checking whether bdev_open_by_path() exists... configure: error:
*** None of the expected "blkdev_get_by_path()" interfaces were detected.
*** This may be because your kernel version is newer than what is
*** supported, or you are using a patched custom kernel with
*** incompatible modifications.
***
*** ZFS Version: zfs-2.1.15-2
*** Compatible Kernels: 3.10 - 6.7

Building module:
Cleaning build area...(bad exit status: 2)
Failed command:
make -C /lib/modules/5.14.0-446.el9.x86_64/build M=/var/lib/dkms/zfs/2.1.15/build clean
Building module(s)...(bad exit status: 2)
Failed command:
make -j12 KERNELRELEASE=5.14.0-446.el9.x86_64
Error! Bad return status for module build on kernel: 5.14.0-446.el9.x86_64 (x86_64)
Consult /var/lib/dkms/zfs/2.1.15/build/make.log for more information.
dkms autoinstall on 5.14.0-446.el9.x86_64/x86_64 succeeded for nvidia
dkms autoinstall on 5.14.0-446.el9.x86_64/x86_64 failed for zfs(10)
Error! One or more modules failed to install during autoinstall.
Refer to previous errors for more information.
dkms: autoinstall for kernel 5.14.0-446.el9.x86_64 Failed.

[tonyhutter]

don't compile with Centos last kernel-5.14.0-446.el9.x86_64

Which distro are you running specifically?

zfs-2.1.15 builds on AlmaLinux 9.4 with the latest 5.14.0-427.16.1.el9_4.x86_64 kernel:

$ ./autogen.sh && ./configure && make -j `nproc`
...
Skipping BTF generation for /home/hutter/zfs/module/zcommon/zcommon.ko due to unavailability of vmlinux
  BTF [M] /home/hutter/zfs/module/zfs/zfs.ko
Skipping BTF generation for /home/hutter/zfs/module/zfs/zfs.ko due to unavailability of vmlinux
make[3]: Leaving directory '/usr/src/kernels/5.14.0-427.16.1.el9_4.x86_64'
make[2]: Leaving directory '/home/hutter/zfs/module'
make[2]: Entering directory '/home/hutter/zfs'
[ -x ./scripts/zfs-tests.sh ] && \
    ./scripts/zfs-tests.sh -c
make[2]: Leaving directory '/home/hutter/zfs'
make[1]: Leaving directory '/home/hutter/zfs'

$ sudo ./cmd/zfs/zfs --version
zfs-2.1.15-1
zfs-kmod-2.1.15-1

$ uname -a
Linux centos9 5.14.0-427.16.1.el9_4.x86_64 #1 SMP PREEMPT_DYNAMIC Thu May 9 18:15:59 EDT 2024 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/redhat-release 
AlmaLinux release 9.4 (Seafoam Ocelot)

[smusich]

Distro: Centos Stream 9, with Centos-Stream 9 kernel-5.14.0-444.el9.x86_64 compile is fine.

[tonyhutter]

Unfortunately we don't support CentOS stream

[kai4785]

Counter point. CentOS Stream is previewing the upcoming changes to RHEL, AlmaLinux, and RockyLinux. Those distros will soon pick up this backported kernel version 6.9 change (which I know 6.9 isn't fully supported yet either).
I've tracked down this particular code change to this commit.
torvalds/linux@e97d06a
If there's a "Support kernel version 6.9" issue somewhere, I think we could mark this a duplicate of that ticket.

Additionally, downgrading to kernel 5.14.0-444.el9.x86_64 will work for CentOS Stream 9 users. So it's only this brand new 446 kernel package that has new code.

[smusich]

Maybe someone is interested for Centos 9 you can easily assemble zfs-2.2.4 from srpm fedora 40, with kernel 446 everything seems to work.

[tonyhutter]

@smusich you should also be able to install the EL9 dkms packages as well. That should alleviate the issues when the RHEL/Alma/Rocky/Stream kernel version numbers are not 100% matched up.

[smusich]

zfs-dkms is also needed from fedora

[ramonwirsch]

@smusich I simply used the Fedora 38 repo. Works without any further changes. Just needed to hardcode the fedora release version.

@tonyhutter I believe we are both already on zfs-dkms via epel/zfs-release-2-3.el9 as instructed in the current "Getting Started" section.

Btw. since I was not aware that Centos-Stream was not supported, that might be sth. to clarify on that Getting Started page. Since Stream has existed for a while and the non-Stream variants had been discontinued, I simply counted "CentOS-Stream" as covered under "CentOS-based distros".

[smusich]

@ramonwirsch I use Fedora 40 repo. I'm currently running a test from the package zfs-test.

[hjmallon]

You can cherry-pick these commits and it seems to build again (they cherry-pick cleanly)

cfb96c7
e3120f7

[nscfreny]

What goes inte CentOS Stream usually ends up in the next RHEL release. On RHEL 9.5 beta (currently kernel-5.14.0-503.2.1.el9_5.x86_64), zfs-2.1.15 does build with the two cherry-picks suggested above.

Are there still plans to release zfs-2.1.16?
If so, will it be supported on RHEL 9.5?

[Trogvars]

Using zfs-testing worked for me.
Current kernel - 5.14.0-522.el9.x86_64

dnf install https://zfsonlinux.org/epel/zfs-release-2-3$(rpm --eval "%{dist}").noarch.rpm

dnf install -y epel-release
dnf config-manager --enable zfs-testing
dnf install kernel-devel zfs

This will install zfs-2.2.6 instead of zfs-2.1.15. Will compile kernel modules and zfs-dkms.
Manual build from source zfs-2.2.6 also works.

Don't forget to rebuild initrd:
dracut --regenerate-all -f

[gcoretech]

AlmaLinux 9.5 has been released with kernel 5.14.0-503.11.1.el9_5.x86_64 and compiling zfs 2.1.15 sources fails with

checking whether bdev_open_by_path() exists... configure: error: 
	*** None of the expected "blkdev_get_by_path()" interfaces were detected.

Will there be an official 2.1.16 release?

If not, is it safe and sufficient to apply patches cfb96c7 and e3120f7? I've successfully built a custom 2.1.16pre RPM including those patches, but I don't know if this may cause issues on production servers later on.

[AllKind]

@gcoretech #16746 #16781