This bug was fixed in the package zfs-linux - 2.1.5-1ubuntu6~22.04.6
---------------
zfs-linux (2.1.5-1ubuntu6~22.04.6) jammy; urgency=medium
[ Ghadi Elie Rahme ]
* Fix arc_summary on jammy 6.8 HWE kernel (LP: #1980848)
- d/p/ubuntu/4752-lp1980848-fix-arc-summary-hwe-kernel.patch
[ Heitor Alves de Siqueira ]
* Fix hangs when writing to pools with high objnum count (LP: #2115683):
- d/p/lp2115683-Replace-P2ALIGN-with-P2ALIGN_TYPED-and-delete-P2ALIG.patch
Thanks to chenqiuhao1997 <[email protected]>.
-- Heitor Alves de Siqueira <[email protected]> Mon, 30 Jun 2025
18:35:08 -0300
** Changed in: zfs-linux (Ubuntu Jammy)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1980848
Title:
arc_summary doesn't work with HWE kernel
Status in zfs-linux package in Ubuntu:
Fix Released
Status in zfs-linux source package in Focal:
Fix Released
Status in zfs-linux source package in Jammy:
Fix Released
Bug description:
[ Impact ]
The arc_summary command doesn't work on HWE kernels for Focal
[ Test Plan ]
1) setup 20.04 with HWE kernel 5.15
2) install `zfsutils-linux`
3) run `arc_summary`, this should not cause any errors
$ arc_summary
Traceback (most recent call last):
File "/usr/sbin/arc_summary", line 875, in <module>
main()
File "/usr/sbin/arc_summary", line 826, in main
kstats = get_kstats()
File "/usr/sbin/arc_summary", line 259, in get_kstats
with open(PROC_PATH+section, 'r') as proc_location:
FileNotFoundError: [Errno 2] No such file or directory:
'/proc/spl/kstat/zfs/xuio_stats'
[ Where problems could occur ]
Given that upstream does not have to deal with two kernel versions like
Ubuntu (GA vs HWE), our SAUCE patch will skip any non-existent files under
/proc/spl/kstat/zfs. This ensures that arc_summary works as expected under both
GA and HWE kernels.
Users expecting the HWE kernel to contain output from xuio_stats like
we had in GA will not see it in the ARC summary output. Any new stats
that get introduced into the HWE kernel will also be skipped due to
this patch, if they're missing from the GA kernel.
--
# Issue description
`arc_summary` no longer works with kernel 5.15. It used to work with
previous kernel like 5.13.
# Steps to reproduce
1) setup 20.04 with HWE kernel 5.15
2) install `zfsutils-linux`
3) run `arc_summary`
$ arc_summary
Traceback (most recent call last):
File "/usr/sbin/arc_summary", line 875, in <module>
main()
File "/usr/sbin/arc_summary", line 826, in main
kstats = get_kstats()
File "/usr/sbin/arc_summary", line 259, in get_kstats
with open(PROC_PATH+section, 'r') as proc_location:
FileNotFoundError: [Errno 2] No such file or directory:
'/proc/spl/kstat/zfs/xuio_stats'
Indeed, the xuio_stats file isn't there anymore:
$ ll /proc/spl/kstat/zfs/
total 0
dr-xr-xr-x 21 root root 0 Jul 6 10:49 ./
dr-xr-xr-x 4 root root 0 Jul 6 10:49 ../
-rw-r--r-- 1 root root 0 Jul 6 10:49 abdstats
-rw-r--r-- 1 root root 0 Jul 6 10:49 arcstats
dr-xr-xr-x 20 root root 0 Jul 6 10:49 data/
-rw------- 1 root root 0 Jul 6 10:49 dbgmsg
-rw------- 1 root root 0 Jul 6 10:49 dbufs
-rw-r--r-- 1 root root 0 Jul 6 10:49 dbufstats
dr-xr-xr-x 70 root root 0 Jul 6 10:49 default/
-rw-r--r-- 1 root root 0 Jul 6 10:49 dmu_tx
-rw-r--r-- 1 root root 0 Jul 6 10:49 dnodestats
-rw-r--r-- 1 root root 0 Jul 6 10:49 fletcher_4_bench
-rw-r--r-- 1 root root 0 Jul 6 10:49 fm
-rw-r--r-- 1 root root 0 Jul 6 10:49 import_progress
-rw-r--r-- 1 root root 0 Jul 6 10:49 metaslab_stats
-rw-r--r-- 1 root root 0 Jul 6 10:49 vdev_cache_stats
-rw-r--r-- 1 root root 0 Jul 6 10:49 vdev_mirror_stats
-rw-r--r-- 1 root root 0 Jul 6 10:49 vdev_raidz_bench
-rw-r--r-- 1 root root 0 Jul 6 10:49 zfetchstats
-rw-r--r-- 1 root root 0 Jul 6 10:49 zil
-rw-r--r-- 1 root root 0 Jul 6 10:49 zstd
# Workaround
This (naive) patch sidesteps the problem:
$ diff -Naur /usr/sbin/arc_summary.old /usr/sbin/arc_summary
--- /usr/sbin/arc_summary.old 2022-07-06 10:59:50.752833101 -0400
+++ /usr/sbin/arc_summary 2022-07-06 10:59:22.449113169 -0400
@@ -255,6 +255,8 @@
secs = SECTION_PATHS.values()
for section in secs:
+ if not os.path.exists(PROC_PATH+section):
+ continue
with open(PROC_PATH+section, 'r') as proc_location:
lines = [line for line in proc_location]
# Additional information
$ lsb_release -rd
Description: Ubuntu 20.04.4 LTS
Release: 20.04
$ uname -r
5.15.0-41-generic
$ apt-cache policy zfsutils-linux linux-image-generic-hwe-20.04
zfsutils-linux:
Installed: 0.8.3-1ubuntu12.14
Candidate: 0.8.3-1ubuntu12.14
Version table:
*** 0.8.3-1ubuntu12.14 500
500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64
Packages
100 /var/lib/dpkg/status
0.8.3-1ubuntu12.9 500
500 http://security.ubuntu.com/ubuntu focal-security/main amd64
Packages
0.8.3-1ubuntu12 500
500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
linux-image-generic-hwe-20.04:
Installed: 5.15.0.41.44~20.04.13
Candidate: 5.15.0.41.44~20.04.13
Version table:
*** 5.15.0.41.44~20.04.13 400
400 http://us.archive.ubuntu.com/ubuntu focal-proposed/main amd64
Packages
100 /var/lib/dpkg/status
5.13.0.52.59~20.04.31 500
500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu focal-security/main amd64
Packages
5.4.0.26.32 500
500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
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