[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Launchpad Bug Tracker]

This bug was fixed in the package zfs-linux - 0.6.5.11-1ubuntu3.2

---
zfs-linux (0.6.5.11-1ubuntu3.2) artful; urgency=medium

  * Add new module loading systemd service (LP: #1741081)
- loads zfs module unconditionally, and make the
  zfs-import-cache.service and zfs-import-scan.service services
  require this service.

 -- Colin Ian King   Fri, 2 Mar 2018 11:47:12
+

** Changed in: zfs-linux (Ubuntu Artful)
   Status: Fix Committed => Fix Released

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

Richard, thanks for testing.

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Richard Laager]

I updated to the version from -proposed and rebooted. I verified that no
units failed on startup.

** Tags added: verification-done-artful

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

** Changed in: zfs-linux (Ubuntu Artful)
   Status: In Progress => Fix Committed

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

FYI, I've uploaded the same fix to Artful for the SRU

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Scott Emmons]

I can confirm that with the latest bionic packages (zfsutils-linux
0.7.5-1ubuntu4) all units start successfully for the case where no ZFS
pools are present. This is exactly as I would expect.

I can't really speak to the discussion about tainted kernel. If I didn't
want ZFS, I wouldn't install zfsutils-linux, so I think it's a
reasonable expectation as-is.

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

Yes, please reject the artful SRU

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Łukasz Zemczak]

Should I reject the artful SRU in that case? The .service file indeed
looks like it might need some changes, I would prefer the latest bionic
version to be SRUed.

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

I've pushed a new release for Bionic to pick up the changes as suggested
by Richard in comment #11. If that is a reasonable working solution I'll
pick these changes up for an Artful SRU.

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Fabian Grünbichler]

IMHO this is completely backwards, see
https://github.com/zfsonlinux/zfs/pull/7259 for an upstream discussion
similar to this.

systemd service units are not the proper place to load modules - there
is {/lib,/etc}/modules-load.d/ which gets parsed by systemd-load-
modules.service early in the boot process, and ZoL even ships a
(disabled by default) snippet for /lib that supports. just flip that one
to enabled (admin can override via /etc) and you don't need to introduce
bogus services.

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Richard Laager]

zfs-load-module.service seems to have a Requires on itself? That has to
be wrong.

Also, zfs-import-cache.service and zfs-import-scan.service need an After
=zfs-load-module.service. They're not getting one automatically because
of DefaultDependencies=no (which seems appropriate here, so leave that
alone). Scott, can you try this? I think it will fix your issue, since
zfs-mount.service already has After=zfs-load-cache.service and After
=zfs-load-scan.service.

The proposed package, with the changes above should fix the issue I'm
reporting.

However, LP #1672749 says, "Since zfsutils-linux/0.6.5.9-4, zfs module
is not automatically loaded on systems that no zpool exists, this avoids
tainting everyone's kernel who has the package installed but is not
using zfs." Is this still an important goal? If so, wasn't that lost
with ubuntu-load-zfs-unconditionally.patch? Or perhaps something is
keeping zfs-import-scan.service from being enabled by default?

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Scott Emmons]

OK, I retested with 0.7.5-1ubuntu3 and it's almost there but zfs-
mount.service still runs before the zfs kernel module is loaded:

$ systemctl --failed
  UNIT  LOAD   ACTIVE SUBDESCRIPTION
● zfs-mount.service loaded failed failed Mount ZFS filesystems

$ sudo journalctl -u zfs-mount.service
-- Logs begin at Fri 2018-03-02 19:08:55 UTC, end at Fri 2018-03-02 19:31:42 
UTC. --
Mar 02 19:09:00 ubuntu systemd[1]: Starting Mount ZFS filesystems...
Mar 02 19:09:00 ubuntu zfs[557]: The ZFS modules are not loaded.
Mar 02 19:09:00 ubuntu zfs[557]: Try running '/sbin/modprobe zfs' as root to 
load them.
Mar 02 19:09:00 ubuntu systemd[1]: zfs-mount.service: Main process exited, 
code=exited, status=1/FAILURE
Mar 02 19:09:00 ubuntu systemd[1]: zfs-mount.service: Failed with result 
'exit-code'.
Mar 02 19:09:00 ubuntu systemd[1]: Failed to start Mount ZFS filesystems.

But, by the time the system is fully up, something else has loaded the
zfs kernel module along the way:

$ lsmod|grep zfs
zfs  3407872  3

I do see that zfs-load-module.service has "WantedBy=zfs-mount.service",
but maybe zfs-mount.service needs "After=zfs-load-module.service" to
insure the dependency order? Looking at the dependency tree, zfs-
mount.service and zfs-import.target happen in parallel with the start of
zfs-load-module.service resulting in a race condition.

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Scott Emmons]

Great, thanks Colin! We will test this on bionic very soon and will
follow up to confirm.

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

Note: I've put a copy of the Artful fix in the following PPA for test
purposes, it can be installed using:

sudo add-apt-repository ppa:colin-king/zfs-artful-sru-1741081
sudo apt-get update
sudo apt-get dist-upgrade

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

** Description changed:

+ == SRU Request, Artful ==
+ 
+ Enable ZFS module to be loaded without the broken ubuntu-load-zfs-
+ unconditionally.patch.
+ 
+ == Fix ==
+ 
+ Add a new zfs-load-module.service script that modprobes the ZFS module
+ and remove any hard coded module loading from zfs-import-cache.service &
+ zfs-import-scan.service and make these latter scripts require the new
+ zfs-load-module.service script.  Also remove the now defunct ubuntu-
+ load-zfs-unconditionally.patch as this will no longer be required.
+ 
+ == Testcase ==
+ 
+ On a clean VM, install with the fixed package, zfs should load
+ automatically.
+ 
+ == Regression potential ==
+ 
+ ZFS module may not load if the changes are broken. However, testing
+ proves this not to be the case.
+ 
+ 
+ 
  I just noticed on my test VM of artful that zfs-import-cache.service
  does not have a ConditionPathExists=/etc/zfs/zpool.cache. Because of
  that, it fails on startup, since the cache file does not exist.
  
  This line is being deleted by 
debian/patches/ubuntu-load-zfs-unconditionally.patch. This patch seems to exist 
per:
  https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/1672749
  
  This patch still exists in bionic, so I assume it will be similarly
  broken.
  
  If the goal of the patch is to load the module (and only that), I think
  it should create a third unit instead:
  
  zfs-load-module.service
   ^^ runs modprobe zfs
  
  zfs-import-cache.service & zfs-import-scan.service
    ^^ per upstream minus modprobe plus Requires=zfs-load-module.service
  
  I have tested this manually and it works. I can submit a package patch
  if this is the desired solution.
  
  Interestingly, before this change, zfs-import-scan.service wasn't
  starting. If started manually, it worked. I had to give it a `systemctl
  enable zfs-import-scan.service` to create the Wants symlinks. Looking at
  the zfsutils-linux.postinst, I see the correct boilerplate from
  dh_systemd, so I'm not sure why this wasn't already done. Can anyone
  confirm or deny whether zfs-import-scan.service is enabled out-of-the-
  box on their system?
  
  Is the zfs-import-scan.service not starting actually the cause of the
  original bug? The design is that *either* zfs-import-cache.service or
  zfs-import-scan.service starts. They both call modprobe zfs.

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Launchpad Bug Tracker]

This bug was fixed in the package zfs-linux - 0.7.5-1ubuntu3

---
zfs-linux (0.7.5-1ubuntu3) bionic; urgency=medium

  * Add new module loading systemd service (LP: #1741081)
- loads zfs module unconditionally, and make the
  zfs-import-cache.service and zfs-import-scan.service services
  require this service.

 -- Colin Ian King   Fri, 2 Mar 2018 11:47:12
+

** Changed in: zfs-linux (Ubuntu Bionic)
   Status: In Progress => Fix Released

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

** Also affects: zfs-linux (Ubuntu Bionic)
   Importance: High
 Assignee: Colin Ian King (colin-king)
   Status: In Progress

** Also affects: zfs-linux (Ubuntu Artful)
   Importance: Undecided
   Status: New

** Changed in: zfs-linux (Ubuntu Artful)
 Assignee: (unassigned) => Colin Ian King (colin-king)

** Changed in: zfs-linux (Ubuntu Artful)
   Importance: Undecided => High

** Changed in: zfs-linux (Ubuntu Artful)
   Status: New => In Progress

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Scott Emmons]

I found the xenial issue I was thinking of [1] but I'd be surprised if
that particular case regressed (it had to do with use of /etc/mtab). For
completeness, I'll mention it here anyway.

[1] https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1607920

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Scott Emmons]

Note that for bionic as of this week the behavior is now different. This
particular problem doesn't surface for zfs-import-cache.service (because
the ConditionPathExists expression is back in the unit).

It's not all good news, however, as that one failed unit has been
replaced with:

$ systemctl --failed
  UNIT  LOAD   ACTIVE SUBDESCRIPTION
● zfs-mount.service loaded failed failed Mount ZFS filesystems
● zfs-share.service loaded failed failed ZFS file system shares
● zfs-zed.service   loaded failed failed ZFS Event Daemon (zed)

All because the zfs kernel module is now no longer being loaded. So,
it's related to this bug in that the zfs-import-cache.service was
loading the zfs kernel module because it was running unconditionally.
Now that this unit is no longer running do to ConditionPathExists, other
zfs units fail now.

I'm fairly certain we ran into this same issue back in xenial, I'll see
if I can track down the launchpad # for it. Thanks!

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

@Richard,

thanks for reporting this issue. Re: "I have tested this manually and it
works. I can submit a package patch if this is the desired solution."

..please attach a patch and I'll add it to the package.  Just to
clarify, which releases does this affect?

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Colin Ian King]

** Changed in: zfs-linux (Ubuntu)
   Status: Confirmed => In Progress

** Changed in: zfs-linux (Ubuntu)
   Importance: Undecided => High

** Changed in: zfs-linux (Ubuntu)
 Assignee: (unassigned) => Colin Ian King (colin-king)

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Scott Emmons]

Let me know what I can do to help move this forward. The ubuntu-load-
zfs-unconditionally patch was not a great solution as it results in
systems that install zfsutils-linux to come up in a failed state when
there are no ZFS pools present:

$ systemctl --failed
  UNIT LOAD   ACTIVE SUBDESCRIPTION   
* zfs-import-cache.service loaded failed failed Import ZFS pools by cache file

We use a common system image across a large fleet, some with ZFS pools,
most without - and would prefer not having to do a local override.conf
in our image.

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Scott Emmons]

Confirmed to also affect bionic:

$ sudo journalctl -u zfs-import-cache.service
-- Logs begin at Tue 2018-01-23 17:46:55 UTC, end at Tue 2018-01-23 17:49:18 
UTC. --
Jan 23 17:46:58 ubuntu systemd[1]: Starting Import ZFS pools by cache file...
Jan 23 17:46:59 ubuntu zpool[640]: failed to open cache file: No such file or 
directory
Jan 23 17:46:59 ubuntu systemd[1]: zfs-import-cache.service: Main process 
exited, code=exited, status=1/FAILURE
Jan 23 17:46:59 ubuntu systemd[1]: zfs-import-cache.service: Failed with result 
'exit-code'.
Jan 23 17:46:59 ubuntu systemd[1]: Failed to start Import ZFS pools by cache 
file.

This is on a host with no ZFS filesystems, so expected behavior is a no-
op.

** Tags added: artful bionic

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[Bug 1741081] Re: zfs-import-cache.service fails on startup

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: zfs-linux (Ubuntu)
   Status: New => Confirmed

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