thermal_zone collector error when parameter of cooling device is not fetchable ("Invalid argument")

[dev-maniac]

Host operating system

Linux 6.1.0-38-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.147-1 (2025-08-02) x86_64 GNU/Linux

node_exporter version

1.8.1 (quay.io/prometheus/node-exporter:v1.8.1 via kube-prometheus)

Description

Possibly related to #1703 (similar fix?)

Two new nodes in our cluster are logging following line in node-exporter (1.8.1) every few seconds:

ts=2025-09-10T13:48:42.755Z caller=collector.go:169 level=error msg="collector failed" name=thermal_zone duration_seconds=0.000542769 err="invalid argument"

Cause most probably is that one of the cooling devices in /sys/class/thermal cannot be queried correctly:

/sys/class/thermal# LC_ALL=C cat cooling_device14/cur_state
cat: cooling_device14/cur_state: Invalid argument

(other files/properties can be read)

[BreiteSeite]

I have the same issue.

# podman exec -ti --user nobody systemd-node-exporter cat /sys/class/thermal/cooling_device8/cur_state
cat: read error: Invalid argument

(sanity check):

# podman exec -ti --user nobody systemd-node-exporter cat /sys/class/thermal/cooling_device7/cur_state
3

leads to:

# PAGER= journalctl -e --no-hostname -u node-exporter -n 3
Nov 05 20:11:19 systemd-node-exporter[2836]: time=2025-11-05T19:11:19.994Z level=ERROR source=collector.go:168 msg="collector failed" name=thermal_zone duration_seconds=0.000960864 err="invalid argument"
Nov 05 20:12:20 systemd-node-exporter[2836]: time=2025-11-05T19:12:20.006Z level=ERROR source=collector.go:168 msg="collector failed" name=thermal_zone duration_seconds=0.001378959 err="invalid argument"
Nov 05 20:13:19 systemd-node-exporter[2836]: time=2025-11-05T19:13:19.995Z level=ERROR source=collector.go:168 msg="collector failed" name=thermal_zone duration_seconds=0.001311121 err="invalid argument"

# uname -srvo
Linux 6.17.7-ba01.fc43.x86_64 #1 SMP PREEMPT_DYNAMIC Sun Nov  2 16:22:16 UTC 2025 GNU/Linux

# podman exec -ti --user nobody systemd-node-exporter node_exporter --version
node_exporter, version 1.10.2 (branch: HEAD, revision: 654f19dee6a0c41de78a8d6d870e8c742cdb43b9)
  build user:       root@b29b4019149a
  build date:       20251025-20:05:32
  go version:       go1.25.3
  platform:         linux/amd64
  tags:             unknown

[Lywel]

Same issue on my laptop:

Linux fw13 6.17.7-arch1-1 #1 SMP PREEMPT_DYNAMIC Sun, 02 Nov 2025 17:27:22 +0000 x86_64 GNU/Linux

Running version 1.10.2

level=ERROR source=collector.go:168 msg="collector failed" name=thermal_zone duration_seconds=0.002314866 err="invalid argument"

[discordianfish]

Yeah probably should skip the unreadable ones. PRs welcome!

[discordianfish]

Looks like there is #3420 already