Zfs: /dev/zfs is missing!

[Synergyst]

Type | Version/Name
--- | ---
Distribution Name | Debian Jessie
Distribution Version | 8 update 2
Linux Kernel | Linux pentium 3.16.0-4-amd64 #1 SMP Debian 3.16.43-2+deb8u2 (2017-06-26) x86_64 GNU/Linux
Architecture | amd64
ZFS | 0.6.5.9-2~bpo8+1
SPL | 0.6.5.9-1~bpo8+1

Describe the problem you're observing

When running any ZFS commands I get the error:
/dev/zfs and /proc/self/mounts are required.
Try running 'udevadm trigger' and 'mount -t proc proc /proc' as root.

Describe how to reproduce the problem

zfs get all
/dev/zfs and /proc/self/mounts are required. Try running 'udevadm trigger' and 'mount -t proc proc /proc' as root.

More details

/proc/self/mounts exists and contains the contents of /etc/mtab from the looks.
/dev/zfs does NOT exist.. 'udevadm trigger' does nothing to resolve this.

[BtbN]

modprobe zfs?

[Synergyst]

I have tried this. Nothing happens..

[richardelling]

There are kernel configurations which prevent the zfs module from loading. Check the output of dmesg for zfs-related error messages.

[Synergyst]

I rebooted the server and that seems to have resolved the issue.

Is ZFS not supposed to load automatically without a reboot after following the official wiki instructions for Debian?

Feel free to mark this as closed if there is no further input on the issue.

[MarcS1975]

There are kernel configurations which prevent the zfs module from loading. Check the output of dmesg for zfs-related error messages.

Thank you Richard for the comment!! I had the same problem as Synergyst above and could not find a solution. Almost lost my whole ZFS pool of data. Your comment made me reboot with an old Kernel which made ZFS work. All data was saved.