@Zixing,
Can you help take a look at this bug, it turns out to be a problem for
plucky kernel, and could you also check O/N/J to see if those kernels
have this problem or not.
thx.
** Also affects: linux (Ubuntu Plucky)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Plucky)
Status: New => Triaged
** Changed in: linux (Ubuntu Plucky)
Assignee: (unassigned) => Zixing Liu (liushuyu-011)
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https://bugs.launchpad.net/bugs/2110289
Title:
snapd has high CPU usage for exactly 150 seconds every 5, 7.5 or 10
minutes
Status in Go:
Invalid
Status in Linux:
Fix Committed
Status in snapd:
Invalid
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Plucky:
Triaged
Bug description:
Since recently, I have observed a periodic high CPU spike on the snapd
process.
It first occurs 5 minutes after start of the snapd systemd service. It
always lasts for exactly 150 seconds (2.5 minutes) and occurs every 5,
7.5 or 10 minutes. It maxes out a CPU core for the 150 seconds it is
running.
If you run `sudo snap refresh` while the CPU spike is occurring, the
spike stops immediately.
I have attached a CPU usage log which logs the CPU usage of the snapd
process every 5 seconds.
Some info about my system:
snap --version:
snap 2.68.4
snapd 2.68.4
series 16
ubuntu 22.04
kernel 6.14.5-1-liquorix-amd64
lsb_release -a:
Distributor ID: Ubuntu
Description: Ubuntu 22.04.5 LTS
Release: 22.04
Codename: jammy
uname -a:
Linux schneeflocke 6.14.5-1-liquorix-amd64 #1 ZEN SMP PREEMPT_DYNAMIC
liquorix 6.14-7ubuntu1~jammy (2025-05 x86_64 x86_64 x86_64 GNU/Linux
Measurements:
Spike Start - Spike End -> Total Time
12:25:26 - 12:22:56 -> 2:30 min
12:35:26 - 12:37:56 -> 2:30 min
12:40:26 - 12:42:56 -> 2:30 min
12:47:56 - 12:50:26 -> 2:30 min
12:52:56 - 12:55:26 -> 2:30 min
What additional info can I provide to identify the problem?
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