nvidia-driver sysext hides zfs modules

[rradczewski]

Description

The nvidia-driver extension hides the zfs modules in /usr/lib/modules/*/modules.dep

Impact

One can not use flatcar-zfs without manually running insmod on a system with the nvidia-driver extension enabled

Environment and steps to reproduce

1. Set-up: Create a new flatcar installation on a system with a nvidia GPU and an ignition.json with zfs enabled
2. Task: Run any zfs related command, e.g. zpool status
3. Action(s): -
4. Error: ZFS isn't auto-loaded and can't be loaded using modprobe zfs

core@construct ~ $ grep nvidia /usr/lib/modules/6.6.54-flatcar/modules.dep
kernel/drivers/net/ethernet/nvidia/forcedeth.ko.xz:
video/nvidia-modeset.ko: video/nvidia.ko kernel/drivers/gpu/drm/drm.ko.xz kernel/drivers/i2c/i2c-core.ko.xz
video/nvidia-peermem.ko:
video/nvidia-drm.ko: video/nvidia-modeset.ko video/nvidia.ko kernel/drivers/gpu/drm/drm_kms_helper.ko.xz kernel/drivers/gpu/drm/drm.ko.xz kernel/drivers/i2c/i2c-core.ko.xz
video/nvidia-uvm.ko: video/nvidia.ko kernel/drivers/gpu/drm/drm.ko.xz kernel/drivers/i2c/i2c-core.ko.xz
video/nvidia.ko: kernel/drivers/gpu/drm/drm.ko.xz kernel/drivers/i2c/i2c-core.ko.xz
core@construct ~ $ grep zfs /usr/lib/modules/6.6.54-flatcar/modules.dep
core@construct ~ $ mount | grep sysext
sysext on /usr type overlay (ro,nodev,relatime,seclabel,lowerdir=/run/systemd/sysext/meta/usr:/run/systemd/sysext/extensions/nvidia_runtime/usr:/run/systemd/sysext/extensions/nvidia-driver/usr:/run/systemd/sysext/extensions/flatcar-zfs/usr:/run/systemd/sysext/extensions/docker-flatcar/usr:/run/systemd/sysext/extensions/containerd-flatcar/usr:/usr)

core@construct ~ $ sudo zpool status
The ZFS modules cannot be auto-loaded.
Try running 'modprobe zfs' as root to manually load them.
core@construct ~ $ sudo modprobe zfs
modprobe: FATAL: Module zfs not found in directory /lib/modules/6.6.54-flatcar
core@construct ~ $ sudo insmod /lib/modules/6.6.54-flatcar/extra/spl.ko.xz 
core@construct ~ $ sudo insmod /lib/modules/6.6.54-flatcar/extra/zfs.ko.xz 
core@construct ~ $ sudo zpool status
no pools available

Expected behavior

nvidia-driver and flatcar-zfs can co-exist

Additional information

I've been trying to create a reproducer, but setup-nvidia and install-nvidia both require a NVIDIA GPU to be present and can't be forced to build the sysext.