OS reported a negative free memory value – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.1-7.8

Briefly, this error occurs when the Operating System (OS) reports a negative value for free memory, which is not possible. This could be due to a bug in the OS or Elasticsearch, or an issue with the JVM. To resolve this, you could try updating your OS, Elasticsearch, or JVM to the latest version. Alternatively, you could try adjusting the JVM settings to allocate more memory to Elasticsearch, or check for any processes that may be consuming excessive memory and terminate them.

This guide will help you check for common problems that cause the log ” OS reported a negative free memory value [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: monitor, memory.

Log Context

Log “OS reported a negative free memory value [{}]” classname is OsProbe.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            return 0;
        try {
            final long freeMem = (long) getFreePhysicalMemorySize.invoke(osMxBean);
            if (freeMem 


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