** Also affects: zsys (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: zsys (Ubuntu Focal)
Importance: Undecided => High
** Changed in: zsys (Ubuntu Focal)
Assignee: (unassigned) => Didier Roche (didrocks)
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https://bugs.launchpad.net/bugs/1870461
Title:
zsysd uses more than half of CPU and disk IO
Status in zsys package in Ubuntu:
Fix Released
Status in zsys source package in Focal:
New
Bug description:
[Impact]
* Infinite loop during GC phase can trigger (high CPU usage and disk IO).
This has a no side-effect, just looping withouth any modifications.
* The fix is to cover this case (a dataset that the GC can‘t destroy, put in
a black list for the next loop state). The issue is that due to the order of
if/else if, the else if "in blacklist" was never evaluated.
* The new code is covered by a specific test and coverage confirms this is
now run.
[Test Case]
1. Create a dataset clone on an userdataset. This clone should have a
snapshot or a snapshot/clone to not be automatically deletable.
2. Run zsysctl service gc
-> no more infinite loop (the commands exits after a while with no timeout)
with the fixed package.
[Regression Potential]
* GC is a separate, timer-based process and don’t impact boot or other
operations.
* The 30 existing tests on the GC didn’t regress and we now have some
additional ones around those use case.
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I was installed Ubuntu 20.04 with zfs yesterday, it was OK until a few
updates, after that the zsysd was started draining CPU and disk IO.
How can I fix it to back to normal? Is it possible to rollback recent
system state? If Yes, just how?
NOTE: I was stopped and disabled zsysd service and removed
zsysd.socket file, after that it worked normally for now. And there is
this error occured when I am installing or removing a software package
via apt:
ERROR couldn't connect to zsys daemon: connection error: desc =
"transport: Error while dialing dial unix /run/zsysd.sock: connect: no
such file or directory"
I think this is not a good approach
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: zsys 0.4.2
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu22
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 3 05:37:29 2020
InstallationDate: Installed on 2020-04-01 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200330)
SourcePackage: zsys
UpgradeStatus: No upgrade log present (probably fresh install)
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