Ubuntu
zfs-linux package

zpool won't mount affter upgading from vmlinuz-4.4.0-93-generic to vmlinuz-4.4.0-210-generic on xenial

Asked by serge abidal

I have fzs running happily on xeniall from years. After a kernel update from vmlinuz-4.4.0-93-generic to vmlinuz-4.4.0-210-generic , my zpool won't mount anymore. Manually importing with zpool import failed with a message saying feature org.zfsonlinux:.userobj_accounting is active on the pool and the run system does'nt support this feature.

I can still mount it in read-only . I just can't see why upgrading the kernel, will break this feature as we are still running on linux.

Is there any additionnal, actions to run after updating the kernel. ?

For now I keep booting on my previous kernel image.
l

ps:
Note that don't use stock xenial zfs package. but the zfs-0.7.9 backport provide here https://launchpad.net/~jonathonf/+archive/ubuntu/zfs?field.series_filter=xenial

ii libzfs2linux 0.7.9-3ubuntu4~16.04.york0 amd64 OpenZFS filesystem library for Linux
ii libzfslinux-dev 0.7.9-3ubuntu4~16.04.york0 amd64 OpenZFS filesystem development files for Linux
ii zfs-auto-snapshot 1.2.4-1~16.04.york0 all ZFS automatic snapshot service
ii zfs-dkms 0.7.9-3ubuntu4~16.04.york0 all OpenZFS filesystem kernel modules for Linux
ii zfs-zed 0.7.9-3ubuntu4~16.04.york0 amd64 OpenZFS Event Daemon
ii zfsnap 1.11.1-5~16.04.york0 all Automatic snapshot creation and removal for ZFS
ii zfsutils-linux 0.7.9-3ubuntu4~16.04.york0 amd64 command-line tools to manage OpenZFS filesystem

Regards

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Manfred Hampl
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Best Manfred Hampl (m-hampl) said : 		#1

1. Are you aware that standard support for Ubuntu 16.04 has already ended two years ago (it is now in ESM status)?

2. If the zpool programs that do not work as expected come from a PPA, then you have to ask the provider of the PPA, in this case https://launchpad.net/~jonathonf/+contactuser

3. Are there any messages about zfs in the system logs?

4. Have you tested any intermediate kernels between 4.4.0-93-generic and 4.4.0-210-generic, such that you are able to indicate the first release where the function does not work any more?

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serge abidal (demoze) said (last edit ): 		#2

Thank for your quick answer.

#1 Are you aware that standard support for Ubuntu 16.04 has already ended two years ago (it is now in ESM status

yes I do understand, I'am running Jammy on other system, Not yet ready to upgrade this one bcoz of harware incompatibility ;-(

#2 you have to ask the provider of the PPA, in this case https://launchpad.net/~jonathonf/+contactuser

Sure, I'll do that.

#3 Are there any messages about zfs in the system logs?

Yep, the same message output by the zpool cmd.

Jun 15 10:58:10 backup001.xx.net zpool[1733]: This pool uses the following feature(s) not supported by this system:
Jun 15 10:58:10 backup001.xx.net zpool[1733]: #011org.zfsonlinux:userobj_accounting (User/Group object accounting.)
Jun 15 10:58:10 backup001.xx.net zpool[1733]: All unsupported features are only required for writing to the pool.
Jun 15 10:58:10 backup001.xx.net zpool[1733]: The pool can be imported using '-o readonly=on'.
Jun 15 10:58:10 backup001.xx.net systemd[1]: zfs-import-cache.service: Main process exited, code=exited, status=1/FAILURE
Jun 15 10:58:10 backup001.xx.net systemd[1]: Failed to start Import ZFS pools by cache file.
Jun 15 10:58:10 backup001.xx.net systemd[1]: zfs-import-cache.service: Unit entered failed state.
Jun 15 10:58:10 backup001.xx.net systemd[1]: zfs-import-cache.service: Failed with result 'exit-code'.

#4 Have you tested any intermediate kernels between 4.4.0-93-generic and 4.4.0-210-generic... ?

great idea.

I understand that even if the root cause is the kernel or zfs package, its better for me to upgrade my hardware/distribution.

Thank for your help. I'm going test intermediate kernel version.

Regards

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serge abidal (demoze) said : 		#3

Thanks Manfred Hampl, that solved my question.