Hi, We found the same problem on our production servers. For example, prometheus-node-exporter reported below message: daemon.info: Feb 8 17:43:12 ps601b-202 prometheus-node-exporter[2506]: level=warn ts=2021-02-08T17:43:12.052Z caller=cpu_linux.go:247 collector=cpu msg="CPU Idle counter jumped backwards, possible hotplug event, resetting CPU stats" cpu=78 old_value=1.04782328e+06 new_value=1.04782178e+06 The idle value was changed from 1.04782328e+06 to 1.04782178e+06. AND the server rebooted after some minutes. There is no other error in the log files. I currently suspect the CPU counter decreasing caused the system reboot. On Mon, Dec 28, 2020 at 8:57 AM xuqiang (M) <xuqiang36@xxxxxxxxxx> wrote: > > Our recent test shows that the idle value of /proc/stat can decrease. > Is this an unreported bug? or it has been reported and the solution is > waiting to get merged. > > The results of the two readings from /proc/stat are shown as below, the > interval between the two readings is 150 ms: > > cat /proc/stat > cpu0 5536 10 14160 4118960 0 0 227128 0 0 0 > > cat /proc/stat > cpu0 5536 10 14160 4118959 0 0 227143 0 0 0 -- Gioh Kim Cloud server kernel maintainer Quality Management (IONOS Cloud) 1&1 IONOS SE | Greifswalder Str. 207 | 10405 Berlin | Germany Phone: +49 176 26978962 E-mail: gi-oh.kim@xxxxxxxxxxxxxxx | Web: www.ionos.de Hauptsitz Montabaur, Amtsgericht Montabaur, HRB 24498 Vorstand: Dr. Christian Böing, Hüseyin Dogan, Dr. Martin Endreß, Hans-Henning Kettler, Arthur Mai, Matthias Steinberg, Achim Weiß Aufsichtsratsvorsitzender: Markus Kadelke Member of United Internet Diese E-Mail kann vertrauliche und/oder gesetzlich geschützte Informationen enthalten. Wenn Sie nicht der bestimmungsgemäße Adressat sind oder diese E-Mail irrtümlich erhalten haben, unterrichten Sie bitte den Absender und vernichten Sie diese E-Mail. Anderen als dem bestimmungsgemäßen Adressaten ist untersagt, diese E-Mail zu speichern, weiterzuleiten oder ihren Inhalt auf welche Weise auch immer zu verwenden. This e-mail may contain confidential and/or privileged information. If you are not the intended recipient of this e-mail, you are hereby notified that saving, distribution or use of the content of this e-mail in any way is prohibited. If you have received this e-mail in error, please notify the sender and delete the e-mail.
