This bug was fixed in the package zfs-linux - 2.2.2-0ubuntu9.2
---------------
zfs-linux (2.2.2-0ubuntu9.2) noble; urgency=medium
[ John Cabaj ]
* debian/patches/0001-Improve-performance-for-zpool-trim-on-linux.patch
*
debian/patches/0002-vdev_disk-ensure-trim-errors-are-returned-immediatel.patch
- task txg_sync:696 blocked (LP: #2081678)
* debian/patches/0003-Autotrim-High-Load-Average-Fix.patch
- Activating autotrim results in high load average due to
uninterruptible threads (LP: #2057693)
* debian/patches/0004-Linux-Fix-zfs_prune-panics.patch
- crash in openzfs - 2.2.2 not supported on 6.8 (LP: #2077926)
[ Heitor Alves de Siqueira ]
* Fix "field-spanning write" errors on zpool import (LP: #2082060):
- d/p/4701-zfs_log-add-flex-array-fields-to-log-record-structs.patch
- d/p/4702-lua-add-flex-array-field-to-TString-type.patch
-- John Cabaj <[email protected]> Mon, 09 Dec 2024 14:00:32
-0600
** Changed in: zfs-linux (Ubuntu Noble)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2057693
Title:
Activating autotrim results in high load average due to
uninterruptible threads
Status in Native ZFS for Linux:
Fix Released
Status in zfs-linux package in Ubuntu:
Fix Released
Status in zfs-linux source package in Noble:
Fix Released
Status in zfs-linux source package in Oracular:
Fix Released
Status in zfs-linux source package in Plucky:
Fix Released
Bug description:
SRU Justification
[Impact]
* High load averages when activating autotrim. Logs included below SRU
justification
[Fix]
* Cherry-pick a0aa7a2ee3b5: "Autotrim High Load Average Fix"
[Test Plan]
* Compile tested
* Run through autopkgtest regression tests
[Regression potential]
* Changes isolated, minimal regression risk. Changes already in
upstream ZFS
When activating the autotrim feature on any ZFS version starting from
2.2.0 this will lead to a permanent increase of the load average (as
diplayed in top) due to an uninterruptible vdev_autotrim thread for
each vdev capable of TRIM.
This issue has been reported
(https://github.com/openzfs/zfs/issues/15453) as well as fixed
(https://github.com/openzfs/zfs/pull/15781) upstream but the fix is
not yet backported to Ubuntu.
Since this bug was introduced with version 2.2.0 both mantic as well
as noble are affected.
How to reproduce:
1. Create a pool with at least one TRIM-capable device
2. run "zpool set autotrim=on <pool>"
3. watch the output of "top" or "runtime" and see how the load average
increases permanently even when the system is idle by one per vdev
4. running "ps aux | grep -w D" will show the broken threads:
[root@test ~]# ps aux | grep -w D\<
root 7193 0.0 0.0 0 0 ? D< 13:07 0:00
[vdev_autotrim]
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