ERROR: cpufreq collector failed after 1.499322s: strconv.ParseUint: parsing \"<unknown>\": invalid syntax" source="collector.go:132"

[yangmingbai]

Host operating system: output of uname -a

Linux EM-4V8NH42 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

node_exporter version: output of node_exporter --version

node_exporter, version 0.18.1 (branch: HEAD, revision: 3db7773)
build user: root@b50852a1acba
build date: 20190604-16:41:18
go version: go1.12.5

node_exporter command line flags

/opt/node_exporter-0.18.1.linux-amd64/node_exporter --web.listen-address=":9111"

Are you running node_exporter in Docker?

no

How to solve or avoid this problem? Thank you

[SuperQ]

This seems like a duplicate of #1241, but possibly a new bug.

Can you run the node_exporter with --log.level=debug and get the output for the cpufreq collector?

[SuperQ]

It might also be worth trying out the latest 1.0 release candidate.

[yangmingbai]

[SuperQ]

This looks like an issue with the procfs parsing of the cpufreq data.

[SuperQ]

It would be useful to include the text output of this script:

for f in $(find /sys/devices/system/cpu/cpu*/cpufreq/ -type f) ; do echo "$f: $(< $f)" ; done

[yangmingbai]

for f in $(find /sys/devices/system/cpu/cpu*/cpufreq/ -type f) ; do echo "$f: $(< $f)" ; done
output:

/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq: 2472000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu0/cpufreq/affected_cpus: 0
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu0/cpufreq/related_cpus: 0
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu10/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu10/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu10/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu10/cpufreq/cpuinfo_cur_freq: 2016000
/sys/devices/system/cpu/cpu10/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu10/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu10/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu10/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu10/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu10/cpufreq/affected_cpus: 10
/sys/devices/system/cpu/cpu10/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu10/cpufreq/related_cpus: 10
/sys/devices/system/cpu/cpu10/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu11/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu11/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu11/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu11/cpufreq/cpuinfo_cur_freq: 1872000
/sys/devices/system/cpu/cpu11/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu11/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu11/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu11/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu11/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu11/cpufreq/affected_cpus: 11
/sys/devices/system/cpu/cpu11/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu11/cpufreq/related_cpus: 11
/sys/devices/system/cpu/cpu11/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu12/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu12/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu12/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu12/cpufreq/cpuinfo_cur_freq: 5064000
/sys/devices/system/cpu/cpu12/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu12/cpufreq/scaling_cur_freq: 2160000
/sys/devices/system/cpu/cpu12/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu12/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu12/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu12/cpufreq/affected_cpus: 12
/sys/devices/system/cpu/cpu12/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu12/cpufreq/related_cpus: 12
/sys/devices/system/cpu/cpu12/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu13/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu13/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu13/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu13/cpufreq/cpuinfo_cur_freq: 2472000
/sys/devices/system/cpu/cpu13/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu13/cpufreq/scaling_cur_freq: 1440000
/sys/devices/system/cpu/cpu13/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu13/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu13/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu13/cpufreq/affected_cpus: 13
/sys/devices/system/cpu/cpu13/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu13/cpufreq/related_cpus: 13
/sys/devices/system/cpu/cpu13/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu14/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu14/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu14/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu14/cpufreq/cpuinfo_cur_freq: 2112000
/sys/devices/system/cpu/cpu14/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu14/cpufreq/scaling_cur_freq: 2160000
/sys/devices/system/cpu/cpu14/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu14/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu14/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu14/cpufreq/affected_cpus: 14
/sys/devices/system/cpu/cpu14/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu14/cpufreq/related_cpus: 14
/sys/devices/system/cpu/cpu14/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu15/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu15/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu15/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu15/cpufreq/cpuinfo_cur_freq: 624000
/sys/devices/system/cpu/cpu15/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu15/cpufreq/scaling_cur_freq: 1920000
/sys/devices/system/cpu/cpu15/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu15/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu15/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu15/cpufreq/affected_cpus: 15
/sys/devices/system/cpu/cpu15/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu15/cpufreq/related_cpus: 15
/sys/devices/system/cpu/cpu15/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu17/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu17/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu17/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu17/cpufreq/cpuinfo_cur_freq: 2040000
/sys/devices/system/cpu/cpu17/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu17/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu17/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu17/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu17/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu17/cpufreq/affected_cpus: 17
/sys/devices/system/cpu/cpu17/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu17/cpufreq/related_cpus: 17
/sys/devices/system/cpu/cpu17/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu18/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu18/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu18/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu18/cpufreq/cpuinfo_cur_freq: 2016000
/sys/devices/system/cpu/cpu18/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu18/cpufreq/scaling_cur_freq: 1560000
/sys/devices/system/cpu/cpu18/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu18/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu18/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu18/cpufreq/affected_cpus: 18
/sys/devices/system/cpu/cpu18/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu18/cpufreq/related_cpus: 18
/sys/devices/system/cpu/cpu18/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu19/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu19/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu19/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu19/cpufreq/cpuinfo_cur_freq: 2352000
/sys/devices/system/cpu/cpu19/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu19/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu19/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu19/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu19/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu19/cpufreq/affected_cpus: 19
/sys/devices/system/cpu/cpu19/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu19/cpufreq/related_cpus: 19
/sys/devices/system/cpu/cpu19/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu1/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu1/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_cur_freq: 2424000
/sys/devices/system/cpu/cpu1/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu1/cpufreq/affected_cpus: 1
/sys/devices/system/cpu/cpu1/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu1/cpufreq/related_cpus: 1
/sys/devices/system/cpu/cpu1/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu20/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu20/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu20/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu20/cpufreq/cpuinfo_cur_freq: 2448000
/sys/devices/system/cpu/cpu20/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu20/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu20/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu20/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu20/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu20/cpufreq/affected_cpus: 20
/sys/devices/system/cpu/cpu20/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu20/cpufreq/related_cpus: 20
/sys/devices/system/cpu/cpu20/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu21/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu21/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu21/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu21/cpufreq/cpuinfo_cur_freq: 1920000
/sys/devices/system/cpu/cpu21/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu21/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu21/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu21/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu21/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu21/cpufreq/affected_cpus: 21
/sys/devices/system/cpu/cpu21/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu21/cpufreq/related_cpus: 21
/sys/devices/system/cpu/cpu21/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu22/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu22/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu22/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu22/cpufreq/cpuinfo_cur_freq: 2064000
/sys/devices/system/cpu/cpu22/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu22/cpufreq/scaling_cur_freq: 2280000
/sys/devices/system/cpu/cpu22/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu22/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu22/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu22/cpufreq/affected_cpus: 22
/sys/devices/system/cpu/cpu22/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu22/cpufreq/related_cpus: 22
/sys/devices/system/cpu/cpu22/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu2/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu2/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_cur_freq: 1872000
/sys/devices/system/cpu/cpu2/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu2/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu2/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu2/cpufreq/affected_cpus: 2
/sys/devices/system/cpu/cpu2/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu2/cpufreq/related_cpus: 2
/sys/devices/system/cpu/cpu2/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu3/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu3/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu3/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu3/cpufreq/cpuinfo_cur_freq: 2208000
/sys/devices/system/cpu/cpu3/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu3/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu3/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu3/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu3/cpufreq/affected_cpus: 3
/sys/devices/system/cpu/cpu3/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu3/cpufreq/related_cpus: 3
/sys/devices/system/cpu/cpu3/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu4/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu4/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu4/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu4/cpufreq/cpuinfo_cur_freq: 1944000
/sys/devices/system/cpu/cpu4/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu4/cpufreq/scaling_cur_freq: 2400000
/sys/devices/system/cpu/cpu4/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu4/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu4/cpufreq/affected_cpus: 4
/sys/devices/system/cpu/cpu4/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu4/cpufreq/related_cpus: 4
/sys/devices/system/cpu/cpu4/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu5/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu5/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_cur_freq: 5064000
/sys/devices/system/cpu/cpu5/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu5/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu5/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu5/cpufreq/affected_cpus: 5
/sys/devices/system/cpu/cpu5/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu5/cpufreq/related_cpus: 5
/sys/devices/system/cpu/cpu5/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu6/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu6/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu6/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu6/cpufreq/cpuinfo_cur_freq: 1944000
/sys/devices/system/cpu/cpu6/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu6/cpufreq/scaling_cur_freq: 1440000
/sys/devices/system/cpu/cpu6/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu6/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu6/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu6/cpufreq/affected_cpus: 6
/sys/devices/system/cpu/cpu6/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu6/cpufreq/related_cpus: 6
/sys/devices/system/cpu/cpu6/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu7/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu7/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu7/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu7/cpufreq/cpuinfo_cur_freq: 2160000
/sys/devices/system/cpu/cpu7/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu7/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu7/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu7/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu7/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu7/cpufreq/affected_cpus: 7
/sys/devices/system/cpu/cpu7/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu7/cpufreq/related_cpus: 7
/sys/devices/system/cpu/cpu7/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu8/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu8/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu8/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu8/cpufreq/cpuinfo_cur_freq: 1560000
/sys/devices/system/cpu/cpu8/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu8/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu8/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu8/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu8/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu8/cpufreq/affected_cpus: 8
/sys/devices/system/cpu/cpu8/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu8/cpufreq/related_cpus: 8
/sys/devices/system/cpu/cpu8/cpufreq/scaling_setspeed: <unsupported>
/sys/devices/system/cpu/cpu9/cpufreq/scaling_governor: conservative
/sys/devices/system/cpu/cpu9/cpufreq/cpuinfo_transition_latency: 0
/sys/devices/system/cpu/cpu9/cpufreq/scaling_driver: pcc-cpufreq
/sys/devices/system/cpu/cpu9/cpufreq/cpuinfo_cur_freq: 1968000
/sys/devices/system/cpu/cpu9/cpufreq/scaling_available_governors: conservative userspace powersave ondemand performance 
/sys/devices/system/cpu/cpu9/cpufreq/scaling_cur_freq: 1200000
/sys/devices/system/cpu/cpu9/cpufreq/cpuinfo_max_freq: 2400000
/sys/devices/system/cpu/cpu9/cpufreq/cpuinfo_min_freq: 1200000
/sys/devices/system/cpu/cpu9/cpufreq/scaling_max_freq: 2400000
/sys/devices/system/cpu/cpu9/cpufreq/affected_cpus: 9
/sys/devices/system/cpu/cpu9/cpufreq/scaling_min_freq: 1200000
/sys/devices/system/cpu/cpu9/cpufreq/related_cpus: 9
/sys/devices/system/cpu/cpu9/cpufreq/scaling_setspeed: <unsupported>

[SuperQ]

That's strange, I don't see <unknown> in any of that output. Are you sure this is the same system?

[yangmingbai]

yes, I'm sure，the bug is a rare occurrence

[SuperQ]

I take it that means the error doesn't occur every scrape? How often does this error get reported?

[hoffie]

We have been continuously seeing this as well (still node_exporter 0.18.x). Across a fleet of about 500 HPE DL380 Gen8/9/10 servers running on RHEL7, there are almost always some (5-10) servers in a state where the cpufreq collector returns a failure with the log showing exactly this error message.

My gut feeling says that some machines are more affected than others (maybe CPU type / core count?), but I have not made any analyses to verify this (yet). I suspect a kernel and/or firmware/microcode bug. If I remember correctly, this problem started to increase over time which would imply that some kind of update broke it. We run latest RHEL7 while the original report is about a rather old RHEL7/CentOS7 kernel (7.0/1/2?).

Our workaround consists of accepting the gaps + setting a longer for: period for alerts on cpufreq collector scrape failures.

node_exporter/Prometheus makes this problem visible (and annoying), but I'm not sure if there's anything fixable on the node_exporter/procfs side if the kernel doesn't return valid data.

Please take all of this with a grain of salt as I have no hard evidence to back this. However, I'm not sure if we ever get such evidence as we don't have a way to reproduce this reliably at will.