Arch Linux

skinney6

Member

From: Oakland, CA

Registered: 2013-05-25

Posts: 50

[SOLVED] One CPU stuck in IO Wait after pacman update

I updated yesterday. Kernel was updated (among other packages) to 6.13.7. Since then I have one cpu stuck in IO Wait but I can't determine the process. I first saw it with prometheus/node_exporter and grafana. I'm using `nmon` then `c` to see which  cpu core is in wait. I use `iotop -o` hoping go find the process but it says:

CONFIG_TASK_DELAY_ACCT not enabled in kernel, cannot determine SWAPIN and IO %

Anyone else seeing high IO wait or have idea on how to track it down?
Thank you!

EDIT: I rebooted into the LTS Kernel (6.12.19) but same issue so it's not the kernel version.
EDIT2: I'm using `iotop -a` to accumulate the io. Here's what it looks like. Doesn't seem to add up tho:

https://postimg.cc/1g1Nc7Hy

SOLVED: It's mpd (music player daemon). Stopping mpd and IO drops back to expected levels. I open a bug with mpd.
https://github.com/MusicPlayerDaemon/MPD/issues/2249

Last edited by skinney6 (2025-03-23 13:30:27)

loqs

Member

Registered: 2014-03-06

Posts: 18,875

Re: [SOLVED] One CPU stuck in IO Wait after pacman update

See https://bbs.archlinux.org/viewtopic.php?id=296568 for the iotop issue.